<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0123-3475</journal-id>
<journal-title><![CDATA[Revista Colombiana de Biotecnología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. colomb. biotecnol]]></abbrev-journal-title>
<issn>0123-3475</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Biotecnología, Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0123-34752012000100025</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Mecanismos de defensa y respuestas de las plantas en la interacción micorrícica: una revisión]]></article-title>
<article-title xml:lang="en"><![CDATA[Plant defense mechanisms and responses in the arbuscular mycorrhizal symbiosis: a review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Gómez]]></surname>
<given-names><![CDATA[Margarita]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[Alia]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Corpoica  ]]></institution>
<addr-line><![CDATA[Tibaitatá ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Agronomía ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<volume>14</volume>
<numero>1</numero>
<fpage>271</fpage>
<lpage>284</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0123-34752012000100025&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0123-34752012000100025&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0123-34752012000100025&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El establecimiento de la simbiosis planta-hongos formadores de micorrizas Arbusculares (HFMA) requiere procesos armónicos a nivel espacio-temporal, que dependen de señales para el reconocimiento, colonización e intercambio bidireccional de nutrientes. Las plantas presentan respuestas de defensa frente a posibles organismos invasores; sin embargo, frente a HFMA estas son débiles, localizadas y no impiden la colonización del hongo. Los beneficios de la simbiosis generalmente se asocian a nutrición vegetal, aunque, también está relacionada con el incremento de la tolerancia-resistencia de plantas a los estreses bióticos. La resistencia inducida HFMA (MIR) es importante en el control de patógenos foliares, comedores de hojas y necrótrofos, encontrándose protección de plantas micorrizadas tanto a nivel local como sistémico, relacionada con los niveles de ácido jasmónico en tejidos. Un mecanismo en la MIR está asociado con el "priming", que permite una rápida y eficiente respuesta de defensa de plantas micorrizadas. Se han planteado posibles mecanismos de atenuación de las respuestas de defensa, considerando: activación de supresores de defensa; plantas que producen respuestas de defensa frente a HFMA y otras que no las producen, y plantas que suprimen las respuestas de defensa en la simbiosis. Aunque el control de la simbiosisestá regulado básicamente por la planta, aún se desconoce el papel de los HFMA en el debilitamiento de las respuestas de defensa. Recientemente, se ha dado un avance importante en entender los mecanismos mediante los cuales se establece y mantiene la biotrofía del hongo, al describirse la proteína SP7 que interactúa con el factor de transcripción PR, ERF19 en el núcleo de la célula vegetal. Se ha sugerido que SP7 es un efector que actúa oponiéndose al programa de inmunidad de la planta. Este documento está orientado a hacer una revisión de las respuestas de defensa que presentan las plantas bajo condiciones de simbiosis con HFMA, con el fin tener un acercamiento sobre los posibles mecanismos de atenuación de las mismas, de forma tal que permite el establecimiento de la simbiosis. Además, se desea tener una aproximación al tema de la capacidad de defensa que presenta la planta micorrizada frente a un amplio grupo de organismos patógenos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Harmonic processes between plant and arbuscular mycorrhyzal fungi (AMF) are required for the symbiosis formation between the two organisms. These processes depend on specific signalling for the plant-fungus recognition, colonisation and bidirectional nutrient exchange. Plants show defence responses against invasive organisms, however they react weakly and localised when challenged by AMF. The benefits derived from the mycorrization are described for the nutritional aspect; however, it is known that mycorrhized plants are more tolerant to biotic stresses. Mycorrhizal induced resistance (MIR) is especially important for the control of foliar pathogens, leaf cutters and necrotrophs. There has also been found that mycorrhizal plants are protected both locally and systemically and their protection is related with jasmonic acid levels at their tissues. One of the most important mechanisms for MIR is the so called "priming" that allows plants to exert a fast and efficient defence response. Possible mechanisms to unravel mycorrhizal plants lower defence systems include: defence suppressor activation, differential plants response towards AMF from inexistent to low, and plant defence response suppression during the AMF symbiosis. The symbiosis control is known to be regulated by the plant, however, no role has been assigned to the AMF for the weakening of the plant defence system. Recently, a big step towards understanding of the fungal role has been made. A protein SP7 that interacts with a PR transcription factor ERF19, in the plant nucleus, has been described. This discovery indicates a possible mechanism to establish and maintain the biotrophic status of the AMF counteracting the immune plant system. The main focus of this manuscript is to review the mycorrhizal plant defence responses taking into account that for a functional AMF symbiosis a lesser plant defence mechanism is required. At the same time, the mycorrhizal plant acquires a higher defence capacity against a wide group of attackers.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[hongos formadores de micorriza arbuscular (HFMA)]]></kwd>
<kwd lng="es"><![CDATA[mecanismos de defensa de planta]]></kwd>
<kwd lng="es"><![CDATA[simbiosis]]></kwd>
<kwd lng="es"><![CDATA[priming]]></kwd>
<kwd lng="es"><![CDATA[protección de planta]]></kwd>
<kwd lng="en"><![CDATA[arbuscular mycorrhizal fungi (AMF)]]></kwd>
<kwd lng="en"><![CDATA[plant defense mechanisms]]></kwd>
<kwd lng="en"><![CDATA[symbiosis]]></kwd>
<kwd lng="en"><![CDATA[priming]]></kwd>
<kwd lng="en"><![CDATA[plant protection]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p align="right"><font face="verdana" size="2"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p><font size="4"><b> Mecanismos de defensa y respuestas de las plantas en la interacci&oacute;n micorr&iacute;cica: una revisi&oacute;n </b></font></p>     <p><font size="3"> Plant defense mechanisms and responses in the arbuscular mycorrhizal symbiosis: a review.</font></p>     <p><i> Margarita Ram&iacute;rez G&oacute;mez<sup>1</sup> y Alia Rodr&iacute;guez<sup>2</sup>.</i></p>     <p> <sup>1</sup> I. A. MPhil.  Corpoica, CBB, Tibaitat&aacute;. <a href="mailto:mramirezgomez@gmail.com">mramirezgomez@gmail.com</a>     <br> <sup>2</sup> I.A. PhD. Universidad Nacional de Colombia, Facultad de Agronom&iacute;a. Bogot&aacute;.  <a href="mailto:alrodriguezvi@unal.edu.co">alrodriguezvi@unal.edu.co</a>    <br> </p>     <p>Recibido: marzo 09 de 2008 Aprobado: junio 07 de 2012</p>  <hr>      <p><b>Resumen</b></p>     ]]></body>
<body><![CDATA[<p> El establecimiento de la simbiosis planta-hongos formadores de micorrizas Arbusculares (HFMA) requiere procesos arm&oacute;nicos a nivel espacio-temporal, que dependen de se&ntilde;ales para el reconocimiento, colonizaci&oacute;n e intercambio bidireccional de nutrientes. Las plantas presentan respuestas de defensa frente a posibles organismos invasores; sin embargo, frente a HFMA estas son d&eacute;biles, localizadas y no impiden la colonizaci&oacute;n del hongo. Los beneficios de la simbiosis generalmente se asocian a nutrici&oacute;n vegetal, aunque, tambi&eacute;n est&aacute; relacionada con el incremento de la tolerancia-resistencia de plantas a los estreses bi&oacute;ticos. La resistencia inducida HFMA (MIR) es importante en el control de pat&oacute;genos foliares, comedores de hojas y necr&oacute;trofos, encontr&aacute;ndose protecci&oacute;n de plantas micorrizadas tanto a nivel local como sist&eacute;mico, relacionada con los niveles de &aacute;cido jasm&oacute;nico en tejidos. Un mecanismo en la MIR est&aacute; asociado con el &quot;priming&quot;, que permite una r&aacute;pida y eficiente respuesta de defensa de plantas micorrizadas. Se han planteado posibles mecanismos de atenuaci&oacute;n de las respuestas de defensa, considerando: activaci&oacute;n de supresores de defensa; plantas que producen respuestas de defensa frente a HFMA y otras que no las producen, y  plantas que suprimen las respuestas de defensa en la simbiosis. Aunque el control de la simbiosisest&aacute; regulado b&aacute;sicamente por la planta, a&uacute;n se desconoce el papel de los HFMA en el debilitamiento de las respuestas de defensa. Recientemente, se ha dado un avance importante en entender los mecanismos mediante los cuales se establece y mantiene la biotrof&iacute;a del hongo, al describirse la prote&iacute;na SP7 que interact&uacute;a con el factor de transcripci&oacute;n PR, ERF19 en el n&uacute;cleo de la c&eacute;lula vegetal. Se ha sugerido que SP7 es un efector que act&uacute;a oponi&eacute;ndose al programa de inmunidad de la planta. Este documento est&aacute; orientado a hacer una revisi&oacute;n de las respuestas de defensa que presentan las plantas bajo condiciones de simbiosis con HFMA, con el fin tener un acercamiento sobre los posibles mecanismos de atenuaci&oacute;n de las mismas, de forma tal que permite el establecimiento de la simbiosis. Adem&aacute;s, se desea tener una aproximaci&oacute;n al tema de la capacidad de defensa que presenta la planta micorrizada  frente a un amplio grupo de organismos pat&oacute;genos.</p>     <p><b>Palabras clave</b>: hongos formadores de micorriza arbuscular (HFMA), mecanismos de defensa de planta,  simbiosis, priming, protecci&oacute;n de planta.</p>      <p><b>Abstract</b></p>     <p> Harmonic processes between plant and arbuscular mycorrhyzal fungi (AMF) are required for the symbiosis formation between the two organisms. These processes depend on specific signalling for the plant-fungus recognition, colonisation and bidirectional nutrient exchange. Plants show defence responses against invasive organisms, however they react weakly and localised when challenged by AMF. The benefits derived from the mycorrization are described for the nutritional aspect; however, it is known that mycorrhized plants are more tolerant to biotic stresses. Mycorrhizal induced resistance (MIR) is especially important for the control of foliar pathogens, leaf cutters and necrotrophs.  There has also been found that mycorrhizal plants are protected both locally and systemically and their protection is related with jasmonic acid levels at their tissues. One of the most important mechanisms for MIR is the so called &quot;priming&quot; that allows plants to exert a fast and efficient defence response. Possible mechanisms to unravel mycorrhizal plants lower defence systems include: defence suppressor activation, differential plants response towards AMF from inexistent to low, and plant defence response suppression during the AMF symbiosis. The symbiosis control  is known to be regulated by the plant, however, no role has been assigned to the AMF for the weakening of the plant defence system. Recently, a big step towards understanding of the fungal role has been made. A protein SP7 that interacts with a PR transcription factor ERF19, in the plant nucleus, has been described. This discovery indicates a possible mechanism to establish and maintain the biotrophic status of the AMF counteracting the immune plant system. The main focus of this manuscript is to review the mycorrhizal plant defence responses taking into account that for a functional AMF symbiosis a lesser plant defence mechanism is required. At the same time, the mycorrhizal plant acquires a higher defence capacity against a wide group of attackers.</p>     <p><b>Key words</b>:  arbuscular mycorrhizal fungi (AMF), plant defense mechanisms, symbiosis, priming, plant protection.</p>  <hr>      <p><b>Introducci&oacute;n</b></p>      <p> La asociaci&oacute;n de plantas-hongos formadores de micorrizas arbusculares (HFMA) data de m&aacute;s de 400 millones de a&ntilde;os y se considera que la colonizaci&oacute;n de ecosistemas terrestres por las plantas se debe, en parte, a la alta capacidad de adaptaci&oacute;n a diversos ecosistemas de la asociaci&oacute;n (Remy <i>et al</i>., 1994; Bonfante y Genre, 2008), que se refleja en su amplia distribuci&oacute;n geogr&aacute;fica y alta cobertura de especies vegetales que se asocian a HFMA (Harley y Smith, 1983). Procesos como la fotos&iacute;ntesis y la respiraci&oacute;n, as&iacute; como la regulaci&oacute;n de producci&oacute;n de ROS (Reactive oxygen species) con prop&oacute;sitos de defensa, han sido descritos como mecanismos esenciales para la adaptaci&oacute;n de plantas a ecosistemas terrestres, debido a la liberaci&oacute;n de ox&iacute;geno, impactando los procesos de evoluci&oacute;n de la vida en el planeta (Delauxa et.al., 2012; Kump, 2008) Las mol&eacute;culas ROS son altamente t&oacute;xicas cuando se acumulan en las c&eacute;lulas ya que pueden da&ntilde;ar ADN, prote&iacute;nas y l&iacute;pidos. Sin embargo, se ha comprobado que las ROS son esenciales en procesos de crecimiento y desarrollo  (Foreman <i>et al</i>., 2003), movimiento de estomas, (Pei <i>et al</i>., 2000), e interacciones planta-microorganismos (Torres, 2010). En el proceso de adaptaci&oacute;n a los ecosistemas terrestres, las plantas enfrentaron muchos tipos de estr&eacute;s, incluyendo el ataque de comunidades de microorganismos del suelo (Emiliani <i>et al</i>., 2009). Las  interacciones planta-microorganismos han mostrado diversas respuestas en la planta, en t&eacute;rminos de los niveles de ROS y se ha podido determinar su  importante papel en resistencia de las plantas a pat&oacute;genos (Bindschedler <i>et al</i>., 2006), encontr&aacute;ndose que la planta eleva sus niveles de ROS cuando es atacada por pat&oacute;genos (Fase I) y luego mantiene niveles moderados de producci&oacute;n de ROS (Fase II) (Lamb y Dixon, 1997; Torres et al., 2006). En interacciones simbi&oacute;ticas, se ha podido determinar que se presentan fluctuaciones de niveles de ROS en etapas tempranas del establecimiento de la simbiosis compatibles tanto en rizobios como en HFMA, acompa&ntilde;ado de producci&oacute;n de flavonoides en leguminosas y strigolactonas y factores Myc en plantas - HFMA (Fisher y Long, 1992), encontr&aacute;ndose producci&oacute;n en c&eacute;lulas cercanas a aquellas colonizadas por HFMA (Fester y Hause, 2005), lo cual sugiere que este pude ser un mecanismo de control de la colonizaci&oacute;n. </p>      <p> El intercambio bidireccional de nutrientes es el eje de la simbiosis, en donde la planta suministra carbohidratos al hongo y el hongo facilita nutrientes a la planta en ambientes donde la disponibilidad de &eacute;stos es restrictiva (Genre <i>et al</i>., 2008). Los HFMA son simbiontes obligados, que desarrollan en las c&eacute;lulas de la corteza de la ra&iacute;z el arb&uacute;sculo, formando una interfase hongo- planta para el intercambio de nutrientes (Gadkar et al., 2001). Sin embargo, existen otros beneficios de la simbiosis como son la tolerancia de la planta a estr&eacute;s, el mejoramiento de caracter&iacute;sticas f&iacute;sicas del suelo y el favorecimiento de diversificaci&oacute;n de especies vegetales en ecosistemas (Smith y Read, 2008). </p>      <p> Para obtener estos beneficios, es necesario que planta y hongo establezcan una interacci&oacute;n estable, durable y funcional, basada en el beneficio mutuo y las din&aacute;micas impuestas por las condiciones abi&oacute;ticas en las que se establece. As&iacute;, la asociaci&oacute;n micorr&iacute;cica arbuscular, tiene amplias aplicaciones tanto en ecosistemas y programas de restauraci&oacute;n y mantenimiento de diversidad; como en agro-ecosistemas modernos en los cuales la producci&oacute;n vegetal debe ser sostenible y sustentable. </p>      <p> Algunas de las preguntas m&aacute;s frecuentes para bi&oacute;logos, ec&oacute;logos y agr&oacute;nomos, es &iquest;c&oacute;mo los HFMA logran sobrepasar el sistema de defensa de la planta?,&iquest; qu&eacute; mecanismos utiliza la planta para discriminar entre interacciones ben&eacute;ficas y patog&eacute;nicas con microorganismos?, y finalmente, &iquest;c&oacute;mo podemos utilizar las interacciones ben&eacute;ficas planta-microorganismo, en programas de protecci&oacute;n vegetal y control biol&oacute;gico en sistemas agr&iacute;colas? Esta revisi&oacute;n busca profundizar acerca de las respuestas de defensa de las plantas, los mecanismos de atenuaci&oacute;n las implicaciones de la relaci&oacute;n entre HFMA y plantas en el control de pat&oacute;genos y protecci&oacute;n de la planta. </p>      ]]></body>
<body><![CDATA[<p><b> Mecanismos de defensa de la planta </b></p>      <p> Las comunidades de plantas interact&uacute;an con organismos ben&eacute;ficos y antag&oacute;nicos, lo cual les exige el desarrollo de respuestas adaptativas para integrar las diferentes se&ntilde;ales que reciben. Esta complejidad est&aacute; enmarcada en la gran diversidad de especies de plantas, insectos y microorganismos, incluyendo ben&eacute;ficos que interact&uacute;an y permiten mejorar el crecimiento y la nutrici&oacute;n vegetal, favorecen la tolerancia a estr&eacute;s, el control de plagas y la polinizaci&oacute;n (Pozo <i>et al</i>., 2004). Ante la multiplicidad de interacciones, las plantas presentan una amplia flexibilidad de respuestas frente a organismos ben&eacute;ficos y pat&oacute;genos (Verhagen <i>et al</i>., 2004), con superposici&oacute;n de algunas se&ntilde;ales activadas por la planta y respuestas adaptativas que se mueven entre la protecci&oacute;n frente a los agresores y la obtenci&oacute;n de beneficios, gener&aacute;ndose una sofisticada red de se&ntilde;ales, donde los procesos de sinergismo y antagonismo entre v&iacute;as de se&ntilde;alizaci&oacute;n permiten afinar el mecanismo de defensa m&aacute;s adecuado (Chisholm <i>et al</i>., 2006; Pieterse y Dicke, 2007).</p>      <p> La iniciaci&oacute;n de procesos de defensa de las plantas frente a una posible infecci&oacute;n o colonizaci&oacute;n por  microorganismos,  requiere de un di&aacute;logo molecular entre los organismos involucrados (Gust et. al., 2012) en el cual se debe considerar: 1- Percepci&oacute;n de los patrones MAMPs (patrones moleculares asociados a microorganismo) del microorganismo por los receptores de reconocimiento PRRs de la planta &oacute; 2- Percepci&oacute;n de las prote&iacute;nas efector-espec&iacute;ficos del patovar microbiano por los receptores inmunes de la planta (Spoel y Dong, 2012; Chisholm <i>et al</i>., 2006; Dang y Jones, 2001) .</p>     <p> Un mecanismo de adaptaci&oacute;n de plantas, es su habilidad de reconocer y responder r&aacute;pidamente frente a un posible invasor mediante respuestas de defensa. Respuestas gen-gen se observan cuando un pat&oacute;geno con un gen dominante de avirulencia es reconocido por una planta con un gen dominante de resistencia (R); en interacciones incompatibles el hospedero es resistente, pero en las compatibles no hay reconocimiento gen-gen, el pat&oacute;geno es virulento y el hospedero susceptible. En las respuestas de resistencia gen-gen, mediadas por hormonas como &aacute;cido salic&iacute;lico (SA), &aacute;cido jasm&oacute;nico (JA) y etileno (ET), las plantas presentan mecanismos de defensa mediante efectores, con producci&oacute;n de metabolitos, prote&iacute;nas y acumulaci&oacute;n de calosa y lignina (Glazebrook, 2005).</p>      <p> La respuesta de defensa, puede iniciarse por un reconocimiento gen-gen, que limita el crecimiento del organismo invasor y puede estar acompa&ntilde;ada por la producci&oacute;n de ROS, necesarias para la respuesta hipersensible (HR), que permite la programaci&oacute;n de muerte celular y le impide al invasor el acceso a nutrientes y agua. Esta resistencia mediada por genes R est&aacute; asociada con la activaci&oacute;n de la v&iacute;a de se&ntilde;alizaci&oacute;n dependiente del SA que permite la expresi&oacute;n de prote&iacute;nas relacionadas con patog&eacute;nesis (PR), mientras que otras defensas de la planta est&aacute;n controladas por mecanismos que dependen de ET o de JA (Glazebrook, 2005). La primera respuesta inmune, genera un nivel de defensa basal y le permite reconocer caracter&iacute;sticas comunes de los pat&oacute;genos. Son los patrones moleculares asociados a pat&oacute;genos (PAMPs), los cuales forman parte de la primera l&iacute;nea de defensa y puede ser suprimida por pat&oacute;genos por liberaci&oacute;n de prote&iacute;nas efectoras, que son reconocidas por las plantas a trav&eacute;s de  prote&iacute;nas R, conformando una segunda l&iacute;nea de defensa, llamada inmunidad disparada por efector (Chisholm <i>et al</i>., 2006).</p>     <p> Las plantas pueden activar otra l&iacute;nea de defensa, la resistencia inducida, que es sist&eacute;mica, tiene un amplio espectro de efectividad (Howe, 2004) y puede ser inducida por organismos pat&oacute;genos y ben&eacute;ficos (HFMA y rizobacterias), activada en &oacute;rganos distantes de una planta en respuesta a una infecci&oacute;n localizada y confiere una resistencia mejorada contra un posible ataque posterior para un amplio rango de pat&oacute;genos (Chaturvedi  y Shah, 2007; Vlot <i>et al</i>., 2008; Pozo <i>et al</i>., 2004). Los pat&oacute;genos inducen  resistencia sist&eacute;mica adquirida (SAR) (Durrant y Dong, 2004). En cuanto a la resistencia sist&eacute;mica inducida (ISR) esta es mediada por rizobacterias (Van Loon <i>et al</i>., 1998) y  tambi&eacute;n es observada en plantas colonizadas por HFMA (Liu <i>et al</i>., 2007) y la defensa directa es inducida por herb&iacute;voros (Howe, 2004). Dentro de los mecanismos de defensa inducida, se encuentra la producci&oacute;n de compuestos como prote&iacute;nas relacionadas con patog&eacute;nesis (PR) con actividad antimicrobiana (Van Poecke y Dicke, 2004), inhibidores de proteinasas que afectan insectos (Howe, 2004), producci&oacute;n de sustancias vol&aacute;tiles que atraen parasitoides y predatores (Heil y Ton, 2007; Van Bel y Gaupels, 2004; Frost <i>et al</i>., 2004) y n&eacute;ctar para capturar artr&oacute;podos que controlan herb&iacute;voros (Dicke y Hilker, 2003). Estas se&ntilde;ales pueden transmitirse internamente por haces vasculares (Heil y Ton, 2007; Van Bel y Gaupels, 2004) y externamente mediante sustancias vol&aacute;tiles que permite dirigir la se&ntilde;al a la planta y a plantas circundantes. Algunas de estas se&ntilde;ales pueden actuar indirectamente, mediante atracci&oacute;n de enemigos naturales (Heil y Ton, 2007).</p>      <p> En la resistencia inducida, el SA, el JA y el ET juegan un papel clave (Durrant y Dong, 2004) y la eficiencia en la regulaci&oacute;n de la respuesta depende del tipo espec&iacute;fico de organismo y la cantidad, composici&oacute;n y tiempo de identificaci&oacute;n de la se&ntilde;al que produce la activaci&oacute;n de genes de defensa (Mur <i>et al</i>., 2006). La mayor&iacute;a de genes de respuesta v&iacute;a JA activados por cada atacante son espec&iacute;ficos para la combinaci&oacute;n planta-atacante, pero en mecanismos de comunicaci&oacute;n cruzada, se forma una compleja red de respuesta espec&iacute;fica por el atacante (Pieterse y Dick, 2007). La comunicaci&oacute;n cruzada entre v&iacute;as de defensa permite regular, priorizar y definir la estrategia de defensa dependiendo del atacante, pero organismos ben&eacute;ficos y atacantes pueden alterar la red de se&ntilde;ales y manipular las defensas (Harrison, 2005), usando factores de virulencia como la coronatina que act&uacute;a en forma an&aacute;loga al jasmonato (Nomura <i>et al</i>., 2005). En Arabidopsis la coronatina suprime las defensas dependientes de SA contra <i>P. syringae</i>, incrementando la susceptibilidad al pat&oacute;geno (Brooks <i>et al</i>., 2005), as&iacute; como  la variabilidad intraespec&iacute;fica existente en el grado de interacci&oacute;n entre defensas dependientes de SA y JA puede constituir una forma de evasi&oacute;n frente a estrategias tipo se&ntilde;uelo empleadas por pat&oacute;genos (Traw <i>et al</i>., 2003).</p>       <p><b> Activaci&oacute;n de se&ntilde;ales </b></p>      <p> El ataque de algunas plagas o la HR disparan la activaci&oacute;n de se&ntilde;ales dependientes de SA, con incremento del nivel de SA, que permite la activaci&oacute;n de genes efectores de defensa, como <i>PR-1</i> y de los genes <i>PAD4</i> y <i>EDS1</i>, requeridos para acumulaci&oacute;n de SA (Falk <i>et al</i>., 1999) y aunque <i>PAD4</i> activa respuestas de defensa adicionales, es necesario para bios&iacute;ntesis de SA (Glazebrook <i>et al</i>., 2003). La producci&oacute;n de SA en plantas puede realizarse a partir de isocorimato, codificado por <i>SID2</i>, o a partir de fenilalanina, como ocurre en mutantes <i>sid2</i> en los que la producci&oacute;n de SA se reduce (Wildermuth <i>et al</i>., 2001). <i>EDS5</i> es requerido para la producci&oacute;n de SA en respuestas a pat&oacute;genos ya que codifica por transportadores <i>MATE</i>, que pueden estar involucrados en transporte de intermediarios en la s&iacute;ntesis de SA (Nawrath  <i>et al</i>., 2002).</p>     <p> En la expresi&oacute;n de <i>PR-1</i> por SA, existen dos posibles v&iacute;as de se&ntilde;alizaci&oacute;n, una dependiente y otra independiente de <i>NPR1</i> (Non-expresser of <i>PR-1</i>) (Clarke <i>et al</i>., 2000). En el primer caso, se requiere la interacci&oacute;n de <i>NPR1</i> con factores de transcripci&oacute;n tipo TAGs y de la activaci&oacute;n del factor de transcripci&oacute;n WRKY70 (Despres <i>et al</i>., 2003), aunque no se ha reportado interacci&oacute;n directa  entre <i>NPR1</i> y WRKY70. En el segundo caso, el factor de transcripci&oacute;n AtWhy1 inducido por infecci&oacute;n con <i>P. parasitica</i> y tratamiento con SA, es independiente de <i>NPR1</i>, pero se requiere para la inducci&oacute;n de <i>PR-1</i> por SA (Desveaux <i>et al</i>., 2004).</p>      ]]></body>
<body><![CDATA[<p> Los mecanismos de defensa son complejos y se retroalimentan. As&iacute;, la muerte celular promueve la producci&oacute;n de SA y la producci&oacute;n de SA promueve la muerte celular. De forma similar, <i>PAD4</i>  y <i>EDS1</i> son requeridos para la producci&oacute;n de SA, y la expresi&oacute;n de &eacute;stos es incrementada por SA y por otra parte, <i>NPR1</i> controla los niveles de SA, pero responde a niveles altos de SA (Desveaux <i>et al</i>., 2004). La muerte celular por HR permite la activaci&oacute;n de se&ntilde;alizaci&oacute;n de SA, por lo que plantas retadas con un pat&oacute;geno avirulento, desarrollan resistencia despu&eacute;s de las infecciones con pat&oacute;genos sensibles a respuestas reguladas por SA, presentando SAR (Durrant y Dong  2004).</p>      <p> En respuesta a ataques de herb&iacute;voros y lesiones, se aumentan los niveles de JA, con expresi&oacute;n de genes <i>PDF1.2</i>. Algunos genes regulados por JA tambi&eacute;n son regulados por ET, como <i>PDF1.2</i>, pero se observan genes inducibles por JA que no requieren ET, como <i>VSP1</i> (Norman- Setterblad  <i>et al</i>., 2000). El JA induce los factores de transcripci&oacute;n <i>ERF1, RAP2.6 y JIN1</i> (AtMYC2) (Lorenzo <i>et al</i>., 2003). El <i>ERF1</i> (factor de respuesta de etileno) integra las se&ntilde;ales de JA/ET, su expresi&oacute;n requiere JA y ET, y su sobreexpresi&oacute;n produce activaci&oacute;n de genes de defensa (Lorenzo <i>et al</i>., 2003). Existen diferentes interacciones en las respuestas de SA, JA y ET: mutua inhibici&oacute;n de expresi&oacute;n de genes entre SA y JA; algunos genes requieren JA y ET, otros solamente necesitan uno de ellos (Bostock, 2005), y algunos genes pueden ser inducidos por aplicaciones de SA y JA (Glazebrook <i>et al</i>., 2003). Alteraciones gen&eacute;ticas que aumentan niveles de SA reducen la respuesta a JA, y bloqueos de expresi&oacute;n de SA incrementan la expresi&oacute;n de genes inducidos por JA (Spoel <i>et al</i>., 2003).</p>     <p> La activaci&oacute;n simult&aacute;nea de m&uacute;ltiples v&iacute;as de defensa puede producir altos niveles de resistencia inducida o efectos antag&oacute;nicos (Bostock, 2005). En los mecanismos de comunicaci&oacute;n cruzada se han identificado prote&iacute;nas como la <i>NPR1</i> y la glutaredoxina, que presentan un efecto antag&oacute;nico al SA en la expresi&oacute;n de genes de respuesta a JA (Spoel <i>et al</i>., 2003); el factor de transcripci&oacute;n WRKY70 activa genes de respuesta de SA y reprime genes inductores de JA, actuando como un interruptor molecular en estas dos v&iacute;as (Li <i>et al</i>., 2004), y los factores de transcripci&oacute;n ERF1 y MYC2 act&uacute;an como integradores de se&ntilde;ales de las v&iacute;as JA y ET y activan diferencialmente genes de defensa dependientes de JA (Lorenzo <i>et al</i>., 2003).</p>      <p><b> &quot;Priming&quot; </b></p>     <p> La modulaci&oacute;n de respuestas de defensa de la planta utiliza diversos mecanismos como identificaci&oacute;n, comunicaci&oacute;n cruzada y supresi&oacute;n de se&ntilde;ales de defensa mediada por el pat&oacute;geno. La activaci&oacute;n de respuesta de defensa acompa&ntilde;ada de una estrategia efectiva es fundamental para control de plagas, por el alto costo energ&eacute;tico de la defensa. Este fen&oacute;meno se conoce como &quot;priming&quot;, en el que un est&iacute;mulo recibido facilita la respuesta de otro est&iacute;mulo relacionado y act&uacute;a como un mecanismo de memoria (Conrath <i>et al</i>., 2006), que contribuye a los procesos de adaptaci&oacute;n de la planta al estr&eacute;s (Pieterse and Dicke, 2007).  La eficiencia en la comunicaci&oacute;n entre &oacute;rganos infectados y no infectados es vital para la manifestaci&oacute;n a tiempo de defensas que permitan restringir sist&eacute;micamente el avance del ataque. Los haces vasculares sirven como medio eficiente de comunicaci&oacute;n a larga distancia dentro de la planta. Las se&ntilde;ales a&eacute;reas tambi&eacute;n contribuyen en este proceso. Algunos de los metabolitos candidatos en se&ntilde;ales sist&eacute;micas de defensa de la planta frente a pat&oacute;genos son el metil-salicilato, los jasmonatos, el &aacute;cido azelaico y di-terpenoides, encontrados como se&ntilde;ales m&oacute;viles asociados con la activaci&oacute;n sist&eacute;mica en contra de un amplio espectro de pat&oacute;genos (Chaturvedi y Shah, 2007; Thorpe <i>et al</i>., 2007; Truman <i>et al</i>., 2007). As&iacute;, est&aacute; el &aacute;cido zelaico que ejerce &quot;priming&quot; sobre la v&iacute;a del SA (Chaturved <i>et al</i>.., 2008; Cameron <i>et al</i>.., 1994; Laurie-Berry <i>et al</i>., 2006; Nickstadt <i>et al</i>., 2004; Raacke <i>et al</i>., 2006; Jung, <i>et al</i>., 2009),  los terpenoides (Bouwmeester <i>et al</i>., 2007; Mumm <i>et al</i>., 2009) y los vol&aacute;tiles verdes de hojas (Green leaf vol&aacute;tiles- GLV<sub>s</sub>) que act&uacute;an como &quot;priming&quot; en v&iacute;as de jasmonatos (Heil <i>et al</i>., 2007; Engelberth <i>et al</i>., 2004). Por el contrario, las auxinas probablemente contribuyen a la regulaci&oacute;n negativa de las defensas sist&eacute;micas (Shah, 2009).</p>      <p> El &quot;priming&quot; puede ser inducido por bacterias ben&eacute;ficas (Verhagen <i>et al</i>., 2004), HFMA (Pozo <i>et al</i>., 2005), pat&oacute;genos (Cameron et al., 1999), insectos herb&iacute;voros (De Vos <i>et al</i>., 2006), por aplicaci&oacute;n de sustancias qu&iacute;micas, como bajas dosis de SA (Mur <i>et al</i>., 1996), JA (Kauss <i>et al</i>., 1994) y por compuestos org&aacute;nicos vol&aacute;tiles (VOCs) en relaciones  planta-herb&iacute;voros y planta-planta (Baldwin <i>et al</i>., 2006), observ&aacute;ndose que los VOCs inducidos por herb&iacute;voros producen un est&iacute;mulo en plantas cercanas mejorando directa e indirectamente las respuestas de defensa (Kessler <i>et al</i>., 2006). En plantas en estado de &quot;priming&quot; las respuestas de defensa no son activadas directamente por el agente del &quot;priming&quot;, pero son aceleradas despu&eacute;s de la percepci&oacute;n de la se&ntilde;al de estr&eacute;s, aumentando el nivel de resistencia (Conrath <i>et al</i>., 2006) (<a href="#f1">Figura 1</a>).</p>      <p align="center"><a name="f1"></a><img src="img/revistas/biote/v14n1/v14n1a25f1.jpg"></p>        <p> La infecci&oacute;n local de pat&oacute;genos necr&oacute;trofos puede inducir SAR, que le confiere resistencia a la planta frente a un amplio grupo de atacantes (Sticher <i>et al</i>., 1997) y requiere de la acumulaci&oacute;n end&oacute;gena de mol&eacute;culas de se&ntilde;alizaci&oacute;n de SA, para activaci&oacute;n de genes PR (Durrant y Dong, 2004). En la se&ntilde;alizaci&oacute;n del SAR, el SA puede actuar de dos formas, activando directamente la expresi&oacute;n de genes PR o indirectamente  mediante &quot;priming&quot; con bajas dosis de SA que no activan los genes de defensa directamente, pero potencian la expresi&oacute;n de &eacute;stos  despu&eacute;s de la infecci&oacute;n de pat&oacute;genos (Conrath <i>et al</i>., 2006). Otro gen implicado en &quot;priming&quot; es <i>NPR1</i>, encontr&aacute;ndose que plantas mutantes <i>NPR1</i> infectadas con cepas avirulentas, acumulan niveles similares de SA que plantas silvestres, pero no expresan genes PR o SAR; as&iacute;, <i>NPR1</i> aparentemente juega un papel en &quot;priming&quot; de SA mediado por incremento de expresi&oacute;n de genes de defensa (Cao <i>et al</i>., 1994; Chaturvedi  y Shah, 2007; Vlot <i>et al</i>., 2008).</p>      <p><b> Interacci&oacute;n planta &NDASH; hongos formadores de micorrizas arbusculares </b></p>     <p> El establecimiento de una relaci&oacute;n mutualista requiere reconocimiento y alta coordinaci&oacute;n a nivel fisiol&oacute;gico, morfol&oacute;gico y gen&eacute;tico, a partir de  una permanente comunicaci&oacute;n celular y molecular entre los organismos involucrados en la simbiosis (Parniske, 2004; Parniske, 2008), de tal forma que la planta permita el ingreso del HFMA, sin la invasi&oacute;n de otros organismos, lo que implica el desarrollo de estrategias sofisticadas para percibir y responder mediante respuestas de defensa de diferente intensidad, duraci&oacute;n y localizaci&oacute;n (Dicke y Hilker, 2003). Las relaciones plantas-HFMA se basan en intercambio de se&ntilde;ales de reconocimiento en las fases asimbi&oacute;tica, presimbi&oacute;tica, formaci&oacute;n de apresorio, colonizaci&oacute;n y formaci&oacute;n de arb&uacute;sculos. La germinaci&oacute;n de esporas y la ramificaci&oacute;n y crecimiento de hifas germinativa es estimulada por compuestos vol&aacute;tiles de exudados de la ra&iacute;z como el CO<sub>2</sub> (Bago <i>et al</i>., 2000) y hormonas (Akiyama <i>et al</i>., 2005; Hause <i>et al</i>., 2007), y se considera como la primera se&ntilde;al de interacci&oacute;n planta-hongo, la cual es producida especialmente bajo condiciones de d&eacute;ficit de f&oacute;sforo (Pi) (Akiyama <i>et al</i>., 2005).</p>      ]]></body>
<body><![CDATA[<p> Los flavonoides (Vierheilig y Pich&eacute;, 2002) y algunas hormonas que afectan diferencialmente el crecimiento del hongo (Hause <i>et al</i>., 2007), son importantes en la fase inicial, pero la strigolactona ha mostrado ser una se&ntilde;al de fundamental importancia en el desarrollo de la simbiosis (Akiyama <i>et al</i>., 2005), ya que el est&iacute;mulo de esta hormona en el hongo es necesario para la  producci&oacute;n los factores &quot;Myc&quot; y activaci&oacute;n de la expresi&oacute;n de genes <I>ENDO11</I> para el establecimiento de la simbiosis (Kosuta <i>et al</i>., 2003). La ubicaci&oacute;n de las ra&iacute;ces por las hifas del hongo, se logra mediante se&ntilde;ales tigmiotr&oacute;picas y metabolitos secundarios (Requena <i>et al</i>., 2007). La activaci&oacute;n en el hospedero de genes <i>ENDO</i>, permite a la planta localizar los puntos de contacto de las hifas del hongo para la formaci&oacute;n del apresorio (Kosuta <i>et al</i>., 2003), lo cual, conjuntamente con los factores Myc, lleva a formar un aparato de pre-penetraci&oacute;n (APP) por donde la hifa ingresa a la c&eacute;lula de la epidermis (Genre <i>et al</i>., 2005) hasta  colonizar las c&eacute;lulas corticales y producir los arb&uacute;sculos, con cambios dr&aacute;sticos a nivel celular y activaci&oacute;n de genes relacionados con reorganizaci&oacute;n celular, formaci&oacute;n de membranas y transporte de Pi (Reinhardt, 2007).</p>      <p><b> a. El modelo de se&ntilde;alizaci&oacute;n &quot;Sym&quot;</b></p>     <p> La simbiosis de plantas con HFMA y con rizobios presentan caracter&iacute;sticas similares a nivel molecular, citol&oacute;gico y en la activaci&oacute;n de genes de establecimiento de las simbiosis, por lo que se ha llamado la v&iacute;a com&uacute;n Sym (Parniske, 2000). Oldroyd y Downie (2006), presentaron un modelo para la v&iacute;a de se&ntilde;alizaci&oacute;n Sym, con  participaci&oacute;n de receptores de quinasas espec&iacute;ficos para rizobios (NFR1, NFR5) asociados con la percepci&oacute;n de factores Nod y receptores DMI2/SYMRK. Despu&eacute;s del reconocimiento de factores Nod (y posiblemente Myc) se genera una cascada de fosforilaci&oacute;n en la membrana plasm&aacute;tica, con participaci&oacute;n de segundos mensajeros (fosfolipasas C y D), que regulan la fosforilaci&oacute;n y activan los canales de cationes DMI1/POLLUX y CASTOR. Para la percepci&oacute;n de los factores Nod en la membrana plasm&aacute;tica, se requiere la inducci&oacute;n de oscilaciones de Ca en el n&uacute;cleo y de una nucleoporina (NUP133) que permita la entrada del segundo mensajero, para activar los canales de Ca en el interior y en el exterior de la membrana nuclear. Las bombas de Ca requieren ATP para su movilizaci&oacute;n en contra del gradiente de concentraci&oacute;n y para mantener un nivel adecuado del elemento. Lo anterior, genera la activaci&oacute;n de prote&iacute;na quinasa, dependiente de Ca y calmodulin (CCaMK), localizada en el n&uacute;cleo que regula la nodulaci&oacute;n mediante la activaci&oacute;n de la expresi&oacute;n de genes nodulin. Genes de simbiosis temprana DMI3, codifican para la CCaMK, importante en la simbiosis, ya que regula la morfog&eacute;nesis del n&oacute;dulo y es requerida en la simbiosis con HFMA, posiblemente para activar la respuesta de la planta (Oldroyd y Downie, 2006).</p>      <p><b> Evaluaci&oacute;n de HFMA en resistencia de plantas al estr&eacute;s bi&oacute;tico </b></p>     <p> Las evaluaciones del aporte de los HFMA a la resistencia a enfermedades y plagas se han realizado con pat&oacute;genos del suelo que afectan ra&iacute;ces como <i>Fusarium, Rhizoctonia, Pythium, Verticillum, Phytophthora y Aphanomyces</i> (Whipps, 2004) &oacute; nematodos (Li <i>et al</i>., 2006), encontr&aacute;ndose que la eficiencia de los HFMA en el mejoramiento de la resistencia/tolerancia difiere entre aislamientos, no es aplicable a todos los pat&oacute;genos y es modulada por las condiciones ambientales (Whipps, 2004). Aunque existen pocos reportes de evaluaci&oacute;n de enfermedades en la parte a&eacute;rea de la planta, se observa que la simbiosis aumenta la susceptibilidad de la planta a pat&oacute;genos bi&oacute;trofos, virus (Shaul <i>et al</i>., 1999), mildeos polvosos  y royas, pero esto no incide en  acumulaci&oacute;n de biomasa, ni en la producci&oacute;n de la planta (Whipps <i>et al</i>., 2004). La micorrizaci&oacute;n reduce los s&iacute;ntomas causados por fitoplasma, protege contra Alternaria solani en tomate (Fritz <i>et al</i>., 2006) e incrementa resistencia a <i>Xanthomonas campestres</i> (Liu <i>et al</i>., 2007) y <i>Pseudomonas syringae</i> (Pozo y Azc&oacute;n-Aguilera, 2007) en Medicago truncatula. Adem&aacute;s, se ha observado efecto contra insectos plaga de ra&iacute;z, pero el efecto en plagas foliares es muy variable y depende del h&aacute;bito y grado de especializaci&oacute;n del insecto, observ&aacute;ndose reducci&oacute;n de incidencia de insectos masticadores e incremento en actividad de insectos chupadores (Gange, 2006).</p>      <p> Muchos estudios han mostrado efectos beneficios de la utilizaci&oacute;n de <i>Glomus mosseae, Glomus intraradices, Glomus clarum, Gigaspora gigantea, y Gigaspora margarita</i> en diversos cultivos, por mejoramiento de crecimiento, nutrici&oacute;n, toma de agua y resistencia a plagas  (Guenoune <i>et al</i>., 2001; Abdel-Fattah y Shabana 2002; Chandanie <i>et al</i>., 2006; Hacisalihoglu <i>et al</i>., 2005; Abdel-Fattah, <i>et al</i>., 2011).  El uso de HFMA en control de enfermedades se ha documentado para <i>Cylindrocladium, Fusarium, Macrophomina, Phytophthora, Pythium, Rhizoctonia, Sclerotinium, y Verticillium</i> en diferentes hospederos (Harrier y Watson, 2004). En el caso de Rhizoctonia, se ha encontrado alteraci&oacute;n en la expresi&oacute;n de cuatro genes durante la infecci&oacute;n en fr&iacute;jol colonizado con G. intraradices variando la respuesta entre estimulaci&oacute;n a supresi&oacute;n, de los niveles de transcripci&oacute;n  (Guillon <i>et al</i>., 2002).</p>     <p> Hu <i>et al</i>. (2010) reportan la participaci&oacute;n de HFMA en control de enfermedades en pepino encontrando que inoculaciones con un aislamiento de  <i>Glomus caledonium</i> no protegi&oacute; a la planta de <i>Fusarium</i>, mientras que un mezcla de aislamientos mostr&oacute; un alto potencial de control de la enfermedad, posiblemente debido a que una comunidad con m&uacute;ltiples especies o g&eacute;neros, puede contener unos organismos especializados en procesos de nutrici&oacute;n, mientras que otros pueden estar m&aacute;s relacionados con procesos de tolerancia a estr&eacute;s bi&oacute;tico / abi&oacute;tico, &oacute; a procesos de bioremediaci&oacute;n (Hu <i>et al</i>., 2010; Wang <i>et al</i>., 2005; Wang <i>et al</i>., 2007; Sharma <i>et al</i>., 2009).</p>      <p><b> Mecanismos de inducci&oacute;n de resistencia por micorrizas </b></p>     <p> La inducci&oacute;n de protecci&oacute;n de plantas por HFMA est&aacute; relacionada con mejoramiento en nutrici&oacute;n, compensaci&oacute;n del da&ntilde;o, competencia por fotosintatos o sitios de colonizaci&oacute;n, activaci&oacute;n de mecanismos de defensa de plantas, cambios en  arquitectura de la ra&iacute;z y modificaciones en las poblaciones de organismos en la riz&oacute;sfera, los cuales pueden actuar en forma simult&aacute;nea y su eficiencia depende de condiciones ambientales, tiempo de interacci&oacute;n y los organismos involucrados (Whipps, 2004), con efectos locales y sist&eacute;micos (Cordier <i>et al</i>., 1998; Pozo <i>et al</i>., 2002).</p>      <p> El efecto de protecci&oacute;n de HFMA no puede restringirse a beneficios nutricionales, ya que se han encontrado evidencias de acumulaci&oacute;n de compuestos de defensa en plantas  micorrizadas, aunque en menor proporci&oacute;n que con pat&oacute;genos (Fritz <i>et al</i>., 2006). Las ra&iacute;ces micorrizadas presentan, localmente, acumulaci&oacute;n de ROS y de enzimas hidrol&iacute;ticas como quitinasas y glucanasas, que pueden estar asociadas tanto con el establecimiento y control de la simbiosis, como con la protecci&oacute;n de la planta (Dumas-Gaudot <i>et al</i>., 2000). En follaje de plantas micorrizadas se han encontrado compuestos anti-alimentarios de insectos (Gange, 2006) y los compuestos vol&aacute;tiles liberados por plantas micorrizadas son m&aacute;s atractivos para &aacute;fidos parasitoides, que aquellos de plantas no micorrizadas (Guerrieri <i>et al</i>., 2004). Sin embargo, no se ha reportado acumulaci&oacute;n de prote&iacute;nas PR, SA &oacute; expresi&oacute;n de genes asociados con SAR en tejidos (Pozo y Azc&oacute;n- Aguilar, 2007).</p>     ]]></body>
<body><![CDATA[<p> Plantas de tomate asociadas con <i>Glomus mossae</i>  muestran protecci&oacute;n sist&eacute;mica a la infecci&oacute;n de <i>Phytophthora parasitica</i> (Pozo <i>et al</i>.; 2002), no acumulan prote&iacute;nas PR, pero despu&eacute;s del ataque del pat&oacute;geno, la acumulaci&oacute;n de prote&iacute;nas <i>PR-1</i> y BGL es mayor que en plantas no micorrizadas y con formaci&oacute;n de pectina y calosa en los sitios de infecci&oacute;n del pat&oacute;geno (Pozo <i>et al</i>., 2002). En plantas micorrizadas, con reacciones de defensa contra pat&oacute;genos, no se observa una activaci&oacute;n sist&eacute;mica de mecanismos de defensa celular o bioqu&iacute;mica, lo cual permite plantear al &quot;priming&quot; como el principal mecanismo que opera en el MIR (resistencia inducida por Micorrizas) (Pozo y Azc&oacute;n-Aguilar, 2007). Sin embargo, en infecciones por <i>Phytophthora</i> se han observado estructuras similares a papilas alrededor de los sitios de infecci&oacute;n con deposici&oacute;n de pectinas y calosa, evitando la dispersi&oacute;n del pat&oacute;geno y  mayor acumulaci&oacute;n de <i>PR-1</i>a y &Beta;-1,3 glucanasas que en plantas no micorrizadas (Cordier <i>et al</i>., 1998; Pozo <i>et al</i>., 1999; Pozo <i>et al</i>., 2002). Pl&aacute;ntulas de papa infectadas con <i>Rhizoctonia</i> y micorrizadas, muestran mayores niveles de fitoalexina rishitin y solavetivona, que pl&aacute;ntulas micorrizadas no infectadas (Yao <i>et al</i>., 2003). En plantas de vid micorrizadas se observa protecci&oacute;n contra el nematodo <i>Meloidogyne</i> incognita asociada con la expresi&oacute;n del gen <i>VCH3</i> (Li <i>et al</i>., 2006). La respuesta asociada a &quot;priming&quot; no s&oacute;lo se presenta en &aacute;reas de la ra&iacute;z colonizadas por HFMA y las respuestas de est&iacute;mulo en la parte a&eacute;rea de plantas micorrizadas est&aacute;n relacionados con se&ntilde;ales de metil jasmonato y etileno, con fuertes evidencias de que micorrizas disparan un estado de est&iacute;mulo (&quot;primed&quot;) efectivo en toda la planta (Pozo y Azc&oacute;n- Aguilar, 2007), se&ntilde;al&aacute;ndose la acci&oacute;n sist&eacute;mica de la micorrizaci&oacute;n.</p>      <p><b> Atenuaci&oacute;n de los mecanismos de defensa en la simbiosis planta-HFMA </b></p>     <p> La resistencia a pat&oacute;genos, implica costos a la planta y por tanto &eacute;sta debe identificar r&aacute;pidamente a los organismos ben&eacute;ficos para evitar la activaci&oacute;n de sistemas de defensa (Bonfante y Requena, 2011). Para el reconocimiento de la planta, en el caso de HFMA, as&iacute; como en el de otros microorgansimos, se requiere de un receptor que permita el reconocimiento como MFs para  HFMA o NFs para bacterias (Gough y Cullimore, 2011). El sistema inmune de la planta incluye receptores de prote&iacute;nas y de quinasas ricos en leucina (LRR-RP y LRR - RK), que permiten inmunidad frente a ataque de microorganismos (Zipfel, 2008; Boller y Felix, 2009), contienen un motivo con lisina (LysM) que esta asociado al reconocimiento de patrones de carbohidratos comunes en superficies microbianas y a la inmunidad frente a ataques (Kaku <i>et al</i>., 2006; Kishimoto <i>et al</i>., 2010; Miya <i>et al</i>., 2007; Shimizu <i>et al</i>., 2010; Wan <i>et al</i>., 2008; Willmann <i>et al</i>., 2011), encontr&aacute;ndose que este motivo es fundamental para el establecimiento de asociaciones simbi&oacute;ticas (Gough y Cullimore, 2011; Limpes <i>et al</i>., 2003, Madsen <i>et al</i>., 2003; Po den Camp, <i>et al</i>.,  2011; Radutoir <i>et al</i>., 2003). El &uacute;nico factor de recepci&oacute;n conocido a la fecha asociado a la simbiosis con HFMA, pertenece a la familia LysM-RKs (Op den Camp <i>et al</i>., 2011).</p>      <p> Las se&ntilde;ales de alarma que activan las plantas en presencia de invasores potenciales, regulan grupos de genes relacionados con la defensa de la planta, para seleccionar la respuesta m&aacute;s adecuada (De Vos <i>et al</i>., 2005). Los HFMA comparten similitudes con pat&oacute;genos bi&oacute;trofos presentando susceptibilidad a defensas reguladas por SA, con reducciones en micorrizaci&oacute;n por aplicaci&oacute;n de SA y con incrementos en los niveles de SA en mutantes <i>myc</i>  como respuesta a HFMA, acumulaci&oacute;n baja y temporal en plantas micotr&oacute;ficas (Guerrieri <i>et al</i>., 2004). Las respuestas de defensa son localizadas, d&eacute;biles y transitorias en estados tempranos en interacciones compatibles planta-HFMA (Liu <i>et al</i>., 2003), mientras que en mutantes <i>myc</i> se observan fuertes reacciones de defensa (Gollotte <i>et al</i>., 1993). Para el establecimiento de la simbiosis se deben modular las defensas de la planta y es posible que los HFMA repriman las defensas dependientes de SA en el hospedero, lo que explicar&iacute;a la reducci&oacute;n en la acumulaci&oacute;n de prote&iacute;nas PR en tratamientos con SA o sustancias an&aacute;logas (Shaul <i>et al</i>., 1999).</p>     <p> El proceso de establecimiento de la asociaci&oacute;n con HFMA puede estar regulado por JA, y en las c&eacute;lulas con arb&uacute;sculos se expresan genes de respuesta y de bios&iacute;ntesis de JA, con incrementos en sus niveles en ra&iacute;ces micorrizadas (Hause <i>et al</i>., 2007). El incremento de la resistencia a algunas plagas, en plantas micorrizadas, puede estar vinculada con altos niveles basales de JA, relacionados con &quot;priming&quot; y con  deposici&oacute;n de calosa, que se refleja en la relaci&oacute;n entre JA y la formaci&oacute;n de papilas en ra&iacute;ces de tomate micorrizadas infectadas con Phytophthora (Cordier <i>et al</i>., 1998). Para Arabidopsis se ha propuesto que el JA juega un papel de importancia en inmunidad sist&eacute;mica (Truman <i>et al</i>., 2007), sugiriendo que el JA sirve como se&ntilde;al end&oacute;gena en MIR. El establecimiento de una simbiosis funcional requiere de la supresi&oacute;n parcial de respuestas dependientes de SA, compensada por  incremento de respuestas reguladas por JA, lo cual puede resultar en un &quot;priming&quot; de mecanismos de defensa dependientes de JA, que  puede explicar el espectro de efectividad descrita para MIR: incremento en susceptibilidad a bi&oacute;trofos e incremento de  resistencia a necr&oacute;trofos e insectos masticadores (Pozo y Azc&oacute;n-Aguilar, 2007).</p>      <p> La baja capacidad de los HFMA de inducir respuestas de defensa de la planta, o la regulaci&oacute;n de estas respuestas, pueden ser la causa de la d&eacute;bil y localizada respuesta de las plantas (Garc&iacute;a-Garrido y Ocampo, 2002). As&iacute;, cuando la planta reconoce a los HFMA, activa su sistema de defensa, mediante elicitores, defensas que deben ser reducidas para el establecimiento de la simbiosis (Harrison, 2005; Requena <i>et al</i>., 2007). Garc&iacute;a-Garrido y Ocampo (2002), presentan algunos de los posibles mecanismos para superar las barreras de defensa de la planta:</p>       <p><ol>     <li> <b>Degradaci&oacute;n de las mol&eacute;culas elicitoras</b>: La inactivaci&oacute;n de los elicitores de HFMA puede ser realizada por algunas hidrolasas que se expresan en la simbiosis (Salzer y Boller,  2000), las cuales pueden ser producidas por la planta y reguladas por el Pi, ya que el reconocimiento hongo-planta se produce bajo deficiencia de Pi (Akiyama <i>et al</i>., 2005). La participaci&oacute;n de quitinasas en la degradaci&oacute;n del elicitor es objeto de controversia (Salzer y Boller, 2000) y la prevenci&oacute;n de formaci&oacute;n de elicitores end&oacute;genos, no parece ser el mecanismo de atenuaci&oacute;n, debido a que los HFMA producen cantidades muy bajas de enzimas capaces de degradar la pared celular del hospedero, y son utilizadas para la penetraci&oacute;n de la hifa (Garc&iacute;a-Garrido <i>et al</i>., 2000).</li>     <li> Alteraci&oacute;n de la v&iacute;a de se&ntilde;ales de transducci&oacute;n, mediante bloqueo de alg&uacute;n componente, SA o ROS, implicado como segundo mensajero en la simbiosis. La producci&oacute;n de compuestos oxidativos en la colonizaci&oacute;n se refleja en alteraciones en patrones de enzimas antioxidantes como catalasa y peroxidasa (Blilou <i>et al</i>., 2000(a)).  La degradaci&oacute;n de per&oacute;xido de hidr&oacute;geno por catalasas pudiera ser un mecanismo para evadir la activaci&oacute;n de genes de respuesta de defensa y puede estar regulada por la capacidad de colonizaci&oacute;n de HFMA y concentraciones de Pi (Lambais, 2000). En tabaco, aumentos transitorios en actividad de catalasas y peroxidasas se correlacionan con incrementos temporales de SA. Aunque se desconoce el papel del SA en la simbiosis, los incrementos en concentraci&oacute;n no impiden la formaci&oacute;n de apresorio, pero producen reducci&oacute;n transitoria de la micorrizaci&oacute;n de ra&iacute;ces, sugiriendo que la regulaci&oacute;n de respuestas de defensas de la planta puede darse a trav&eacute;s de la v&iacute;a del SA. Plantas de tabaco incapaces de acumular SA (NahG) presentaron mayor micorrizaci&oacute;n que plantas silvestres, y mutantes <i>Nod</i> y <i>Myc</i> de arveja, mostraron acumulaci&oacute;n de SA a trav&eacute;s del tiempo (Blilou <i>et al</i>., 2000(b)).</li>     <li> Flujos de nutrientes y hormonas. Los niveles de fosfatos y carbohidratos en la planta est&aacute;n, respectivamente, negativa y positivamente relacionados con la colonizaci&oacute;n de HFMA (Jasper <i>et al</i>., 1979). Aunque el mecanismo preciso y las bases moleculares relacionadas con la posible inhibici&oacute;n de colonizaci&oacute;n en altos niveles de Pi se desconocen, es probable que exista un mecanismo de se&ntilde;alizaci&oacute;n que detecte los niveles de Pi, de forma tal que en plantas con altos niveles de fosfato se presente una sobreregulaci&oacute;n de los genes de defensa (Lambais, 2000). Por otra parte, las c&eacute;lulas con arb&uacute;sculos son los mayores vertederos de sucrosa y en esas c&eacute;lulas los incrementos en flujos de sucrosa, glucosa y fructosa presentan correlaci&oacute;n positiva con aumentos en la activaci&oacute;n de genes de defensa  y con resistencia sist&eacute;mica (Blee y Anderson, 2000).</li>     ]]></body>
<body><![CDATA[</ol> </p>     <p> Los niveles de hormonas var&iacute;an diferencialmente en la simbiosis, observ&aacute;ndose reducci&oacute;n en los niveles de etileno (Vierheilig et al., 1994) e incremento en citoquininas que act&uacute;an en la supresi&oacute;n de la actividad quitinasa (Ginzberg <i>et al</i>., 1998), las que en niveles elevados,pueden suprimir la inducci&oacute;n de algunos genes que codifican prote&iacute;nas PR, c&oacute;mo quitinasa y glucanasa, aunque el papel de estas hormonas en la regulaci&oacute;n de las respuestas de defensa no es muy claro (Shaul <i>et al</i>., 2000). La reprogramaci&oacute;n de la planta para lograr compatibilidad con el HFMA despu&eacute;s de las se&ntilde;ales de reconocimiento puede explicar la supresi&oacute;n de las defensas de las plantas, indicando que es la comunicaci&oacute;n planta -hongo lo que prima en este tipo de interacci&oacute;n (Oldroyd <i>et al</i>., 2009).</p>      <p> Finalmente, en un trabajo publicado recientemente por Kloppholz <i>et al</i>. (2011) se identific&oacute; que Glomus intraradices, el hongo modelo para HFMA, secreta una prote&iacute;na (SP7) que interact&uacute;a con el factor de transcripci&oacute;n PR ERF19 en el n&uacute;cleo de la planta, atenuando su sistema de defensa y actuando como promotor del estado biotr&oacute;fico del hongo. El objetivo de un microorganismo bi&oacute;trofo como el hongo FMA es mantener su hospedante vivo para tener c&eacute;lulas vivas de donde alimentarse. Esto quiere decir, que un bi&oacute;trofo debe evitar la elicitaci&oacute;n masiva de respuestas de defensa, que no solamente puede matar al pat&oacute;geno, sino tambi&eacute;n al hospedante. El bi&oacute;trofo utiliza una estrategia mediante la cual &quot;apaga&quot; el sistema de alarma de la planta, manteni&eacute;ndose en la c&eacute;lula del hospedante, sin inducir procesos de muerte programada como ocurre en la respuesta t&iacute;pica a necr&oacute;trofos. En su trabajo, Kloppholz <i>et al</i>. (2011) sugieren que SP7 es una prote&iacute;na efectora que juega un papel en el establecimiento &oacute; mantenimiento del estado biotr&oacute;fico, en t&eacute;rminos generales, por la atenuaci&oacute;n de las respuestas de defensa de la planta. </p>     <p><b> Conclusiones </b></p>      <p> Las plantas est&aacute;n en permanente interacci&oacute;n con un gran n&uacute;mero de organismos ben&eacute;ficos y/o pat&oacute;genos, por lo que requieren del establecimiento de se&ntilde;ales que permitan su reconocimiento inicial, para la  programaci&oacute;n de una estrategia de interacci&oacute;n (defensa o  aceptaci&oacute;n).</p>      <p> Los microorganismos ben&eacute;ficos, como los HFMA, establecen comunicaci&oacute;n con las plantas mediante una serie de se&ntilde;ales de diferentes caracter&iacute;sticas, para el establecimiento de la simbiosis. Sin embargo, el reconocimiento por  la planta del HFMA es  solo el primer paso, ya que en cada fase de  la simbiosis  se presentan se&ntilde;ales espec&iacute;ficas que favorecen o limitan la interacci&oacute;n. El control de la simbiosis, est&aacute; regulado por la planta pr&aacute;cticamente en todas las fases de desarrollo. La planta produce la primera se&ntilde;al de reconocimiento y permite la entrada de HFMA a sus c&eacute;lulas, con respuestas de defensa a niveles suficientemente bajos para permitir el ingreso del hongo. Los recientes descubrimientos, presentados por Kloppholz <i>et al</i>. (2011) muestran claramente que existe una estrategia por parte de los HFMA, para atenuar la respuesta inmune de la planta y, tal y como se sugiere, esta estrategia permite el establecimiento y/o probablemente, el mantenimiento de la relaci&oacute;n biotr&oacute;fica que el hongo FMA establece con su hospedante.</p>      <p> Los HFMA comparten mecanismos de interacci&oacute;n con la planta, similares a los que establecen pat&oacute;genos bi&oacute;trofos, generando reacciones de defensa de las plantas relacionadas con la v&iacute;a del SA,  por lo que, para el establecimiento de la simbiosis, se deben superar estas barreras. En este proceso se activan defensas que permiten a las plantas aumentar su resistencia/tolerancia a pat&oacute;genos necr&oacute;trofos o insectos comedores de follaje, ya que durante la simbiosis se reducen los niveles de SA, para facilitar el ingreso de los HFMA y se incrementan los niveles de JA y ET. En la MIR, el &quot;priming&quot; producido por la interacci&oacute;n HFMA - plantas, asociado al incremento de los niveles de JA en tejidos, permite que la planta adquiera una mayor tolerancia/resistencia a un grupo importante de organismos plaga. La profundizaci&oacute;n en el conocimiento de los mecanismos de regulaci&oacute;n de hormonas en sistemas simbi&oacute;ticos es una herramienta de alto potencial para el  planteamiento de estrategias integradas de biofertilizaci&oacute;n y control biol&oacute;gico de plagas en agroecosistemas.</p>      <p><b>Referencias bibliogr&aacute;ficas</b></p>      <!-- ref --><p>1 Abdel-Fattah G.M. y Shabana Y.M. 2002. 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