<?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>0120-9965</journal-id>
<journal-title><![CDATA[Agronomía Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. colomb.]]></abbrev-journal-title>
<issn>0120-9965</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia, Facultad de Agronomía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-99652021000100030</article-id>
<article-id pub-id-type="doi">10.15446/agron.colomb.v39n1.92081</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Effect of a mix of oligogalacturonides on symbiotic nitrogen fixation in common bean]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto de una mezcla de oligogalacturónidos en la fijación simbiótica del nitrógeno en frijol común]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lara]]></surname>
<given-names><![CDATA[Danurys]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Leija]]></surname>
<given-names><![CDATA[Alfonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Costales-Menéndez]]></surname>
<given-names><![CDATA[Daimy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nápoles]]></surname>
<given-names><![CDATA[María Caridad]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Falcón-Rodríguez]]></surname>
<given-names><![CDATA[Alejandro Bernardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[Georgina]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Ciencias Agrícolas Departamento de Fisiología y Bioquímica Vegetal ]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Centro de Ciencias Genómicas ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<volume>39</volume>
<numero>1</numero>
<fpage>30</fpage>
<lpage>36</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-99652021000100030&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-99652021000100030&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-99652021000100030&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The objective of this study was to evaluate the effect of a mix of pectic oligosaccharides in the common bean-rhizobia symbiosis. Cuba Cueto-25-9-N bean seeds were inoculated with Rhizobium tropici CIAT 899 and treated with a mix of oligogalacturonides, either by application to the seed (10 mg L-1, 1 ml per seed) at sowing and inoculation or by foliar spray (5 or 100 mg L-1, 1.5 ml per plant) to plants with two trefoils. Plant growth, nodulation, nitrogenase activity, and the gene expression of glutamine synthetase and glutamate synthase in nodules were evaluated in inoculated plants and oligogalacturonide-treated inoculated plants at 18 d postinoculation. The oligogalacturonide-treated plants showed increases in shoot and root growth and number of nodules. Regarding nodule function, the oligogalacturonides increased the nitrogenase activity and the expression level of the gene coding for NADH-dependent glutamate synthase. The positive effects of oligogalacturonides resulted in higher effectiveness of the symbiotic nitrogen fixation. The application of oligogalacturonides can offer an alternative to increasing the symbiotic nitrogen fixation in common bean plants.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El objetivo de este estudio fue evaluar el efecto de una mezcla de oligosacáridos pécticos en la simbiosis frijol común-rizobios. Las semillas de frijol Cuba Cueto-25-9-N se inocularon con Rhizobium tropici CIAT 899 y se trataron con una mezcla de oligogalacturónidos por aplicación a la semilla (10 mg L-1, 1 ml por semilla) en el momento de la siembra e inoculación o por aspersión foliar (5 o 100 mg L-1, 1.5 ml por planta) a plantas con dos trifoliolos. A los 18 d después de la inoculación, se evaluó el crecimiento de las plantas, la nodulación, la actividad nitrogenasa y la expresión génica de la glutamina sintetasa y la glutamato sintasa en nódulos de plantas inoculadas y en plantas inoculadas y tratadas con oligogalacturónidos. Las plantas tratadas con oligogalacturónidos mostraron aumentos en el crecimiento del vástago y raíces y en el número de nódulos. En cuanto a la función de los nódulos, los oligogalacturónidos aumentaron la actividad nitrogenasa y el nivel de expresión del gen que codifica la glutamato sintasa dependiente de NADH. Los efectos positivos de los oligogalacturónidos resultaron en una mayor efectividad de la fijación simbiótica del nitrógeno. La aplicación de oligogalacturónidos puede ofrecer una alternativa para incrementar la fijación simbiótica del nitrógeno en plantas de frijol común.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[oligosaccharides]]></kwd>
<kwd lng="en"><![CDATA[symbiosis]]></kwd>
<kwd lng="en"><![CDATA[Phaseolus vulgaris L.]]></kwd>
<kwd lng="en"><![CDATA[Rhizobium.]]></kwd>
<kwd lng="es"><![CDATA[oligosacáridos]]></kwd>
<kwd lng="es"><![CDATA[simbiosis]]></kwd>
<kwd lng="es"><![CDATA[Phaseolus vulgaris L.]]></kwd>
<kwd lng="es"><![CDATA[Rhizobium]]></kwd>
</kwd-group>
</article-meta>
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