<?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>2011-2173</journal-id>
<journal-title><![CDATA[Revista Colombiana de Ciencias Hortícolas]]></journal-title>
<abbrev-journal-title><![CDATA[rev.colomb.cienc.hortic.]]></abbrev-journal-title>
<issn>2011-2173</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Colombiana de Ciencias Hotícolas, Universidad Pedagógica y Tecnológica de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2011-21732019000200269</article-id>
<article-id pub-id-type="doi">10.17584/rcch.2019v13i2.8034</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Diazotrophic bacteria in the growth of micropropagated ornamental pineapple]]></article-title>
<article-title xml:lang="es"><![CDATA[Bacterias diazotróficas en el crecimiento de la piña ornamental micropropagada]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bortolotti Da Silva]]></surname>
<given-names><![CDATA[Adriano]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Florentino]]></surname>
<given-names><![CDATA[Ligiane Aparecida]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[De Sousa Pereira]]></surname>
<given-names><![CDATA[Dalvana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Corrêa Landgraf]]></surname>
<given-names><![CDATA[Paulo Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodrigues Alves]]></surname>
<given-names><![CDATA[Ana Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodrigues Dos Santos-Filho]]></surname>
<given-names><![CDATA[Plinio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade José do Rosário Vellano Agronomy College ]]></institution>
<addr-line><![CDATA[Alfenas ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Federal de Alfenas Departament of Biochemistry ]]></institution>
<addr-line><![CDATA[Alfenas ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2019</year>
</pub-date>
<volume>13</volume>
<numero>2</numero>
<fpage>269</fpage>
<lpage>278</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S2011-21732019000200269&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S2011-21732019000200269&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S2011-21732019000200269&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Ornamental pineapple is a hardy plant with significant landscaping value. Tissue culture of plants is viable for producing plants with a high phytosanitary quality. However, one of the difficulties with this cultivar is the acclimatization process, which is slow and can cause losses. The objective of the present study was to verify the potential of inoculation with diazotrophic bacteria for in vitro and ex vivo growth of ornamental pineapple. A group of diazotrophic bacterial strains selected at the Universidade José do Rosário Vellano (UNIFENAS) was prioritized in this study, and the treatments included bacterial strains UNIFENAS (100 13, 100-60, 100-68, 100-153, 100-167 and 100-198). These strains were evaluated in terms of their capacity to produce indole 3-acetic acid. Subsequently, plants were cultivated in a medium composed of MS medium salts (1/4), adding 1 mL of the bacterial strain. In the control treatment, the plants were maintained in 2 mL of MS medium. 7 days after inoculation, the plants were transplanted into the MS, where they were maintained for 30 days. After in vitro cultivation, the plants were transferred to pots containing commercial Plantmax® substrate and maintained under these conditions for 60 days. The diazotrophic bacteria were able to synthesize auxins, and their inoculation promoted greater growth in vitro and ex vitro in the plants. In the acclimatization phase, the plants inoculated with UNIFENAS strains (100-60, 100-68 and 100-153) promoted a higher shoot growth, chlorophyll content and nitrate reductase enzyme activity.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La piña ornamental es una planta rústica y de alto valor paisajístico. El cultivo de tejidos de la especie se muestra viable, produciendo plantas con alta calidad fitosanitaria. Una de las dificultades de ese cultivo es el proceso de aclimatación, que ocurre lentamente y puede causar pérdidas. El presente estudio tuvo como objetivo verificar el potencial de inoculación de las bacterias diazotróficas en el crecimiento in vitro y ex vitro de la planta de la piña ornamental. Un grupo de cepas de bacterias diazotróficas seleccionadas en la Universidade José do Rosário Vellano (UNIFENAS) fueron usadas en el estudio y las cepas bacterianas UNIFENAS 100-13, 100-60, 100-68, 100-153, 100 167 y 100-198, constituyeron los tratamientos. Se evaluaron las cepas con relación a la capacidad de producir ácido indol-3-acético. Posteriormente, las plantas fueron cultivadas en medio MS (1/4) y 1 mL de la cepa bacteriana. En el tratamiento control se mantuvieron las plantas con 2 mL de medio MS. Después de 7 días de la inoculación, las plantas fueron trasplantadas a MS, donde permanecieron por un período de 30 días. Después del cultivo in vitro, las plantas fueron transferidas a materas con el substrato comercial Plantmax®, donde se mantuvieron por 60 días en estas condiciones. Las bacterias son capaces de sintetizar auxinas y su inoculación promueve mayor crecimiento de las plantas in vitro y ex vitro. En la fase de aclimatación, las plantas inoculadas con cepas UNIFENAS 100-60, 100 68 y 100-153, promovieron un mayor crecimiento de brotes, un mayor contenido de clorofila y una actividad de la enzima nitrato reductasa.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Ananas]]></kwd>
<kwd lng="en"><![CDATA[in vitro]]></kwd>
<kwd lng="en"><![CDATA[bacterial strains]]></kwd>
<kwd lng="en"><![CDATA[acclimatization]]></kwd>
<kwd lng="en"><![CDATA[pigments]]></kwd>
<kwd lng="en"><![CDATA[nitrate reductase activity]]></kwd>
<kwd lng="es"><![CDATA[Ananas]]></kwd>
<kwd lng="es"><![CDATA[in vitro]]></kwd>
<kwd lng="es"><![CDATA[cepas bacterianas]]></kwd>
<kwd lng="es"><![CDATA[aclimatación]]></kwd>
<kwd lng="es"><![CDATA[pigmentos]]></kwd>
<kwd lng="es"><![CDATA[actividad nitrato reductasa]]></kwd>
</kwd-group>
</article-meta>
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