<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952017000100063</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Identificación molecular y evaluación antagónica in vitro de cepas nativas de Trichoderma spp. sobre hongos fitopatógenos de raíz en frijol (Phaseolus vulgaris L.) cv. Montcalm]]></article-title>
<article-title xml:lang="en"><![CDATA[Trichoderma spp. native strains molecular identification and in vitro antagonistic evaluation of root phitopathogenic fungus of the common bean (Phaseolus vulgaris L.) cv. Montcalm]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-García]]></surname>
<given-names><![CDATA[Bertha M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinosa-Huerta]]></surname>
<given-names><![CDATA[Elsa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villordo-Pineda]]></surname>
<given-names><![CDATA[Emiliano]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Guerra]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora-Avilés]]></surname>
<given-names><![CDATA[María A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Tecnológico de Roque  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Instituto de Fitosanidad ]]></institution>
<addr-line><![CDATA[Texcoco México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Politécnica de Guanajuato Laboratorio de Fitopatología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<volume>51</volume>
<numero>1</numero>
<fpage>63</fpage>
<lpage>79</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952017000100063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952017000100063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952017000100063&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Trichoderma spp. es un hongo de la división Ascomycota con gran potencial para controlar enfermedades en los cultivos con importancia económica. Este hongo antagonista inhibe el crecimiento de microorganismos fitopatógenos, entre los que destacan los causantes de enfermedades radiculares, como Rhizoctonia spp. y Fusarium spp. El objetivo de este estudio fue identificar especies de Trichoderma y caracterizar su actividad antagónica in vitro en cepas patogénicas de Rhizoctonia solani, F. oxysporum, F. verticillioides y F. solani con virulencia diferente, determinada a partir de pruebas de patogenicidad en plantas de frijol (Phaseolus vulgaris L.) cv. Montcalm. La hipótesis fue que la identificación y caracterización antagónica de especies de Trichoderma contra hongos patógenos define su eficiencia en el control biológico. El diseño experimental fue completamente al azar, con al menos tres repeticiones. La identificación molecular de Trichoderma spp. se realizó a través de regiones ITS1 e ITS2 separadas por el gen 5.8S del rRNA ribosomal (ITS, Internal Transcribed Spacer). El antagonismo se evaluó con la prueba de papel celofán modificada y cultivos duales para estimar el porcentaje de inhibición de crecimiento radial (PICR). Siete cepas de Trichoderma identificadas por técnicas moleculares mostraron 95 a 100 % de identidad a T. harzianum y T. asperellum. Las cepas de Trichoderma expresaron capacidad antagónica alta con valores medios de PICR de 73.1 a 76.4 en las cepas patogénicas, lo que sugiere efecto de antibiosis (77.6 PICR) y diferentes tipos de interacción hifal. Las cepas antagonistas fueron estadísticamente similares en la inhibición del crecimiento y desarrollo de los patógenos, pero T. asperellum obtuvo valores de antagonismo superiores a T. harzianum con todas las cepas patogénicas, incluso R. solani que fue el patógeno más agresivo para el cv. Montcalm (valor medio 7.0). El efecto antagónico de las cepas de Trichoderma en los hongos fitopatógenos pudo determinarse con pruebas in vitro y corroborado en bioensayos in vivo, con porcentajes de inhibición similares.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Trichoderma spp. is a fungus of the Ascomycota division with great potential to control diseases in economically important crops. This antagonistic fungus inhibits the growth of phytopathogenic microorganisms, including those responsible for root diseases, such as Rhizoctonia spp. and Fusarium spp. The objective of this study was to identify Trichoderma species and to describe their in vitro antagonistic activity in pathogenic strains of Rhizoctonia solani, F. oxysporum, F. verticillioides and F. solani, with different virulence determined based on pathogenicity tests in bean plants (Phaseolus vulgaris L.) cv. Montcalm. The hypothesis was that the identification and antagonistic description of Trichoderma species against pathogenic fungi defines their biological control efficiency. The experimental design was completely random, with at least three repetitions. The molecular identification of Trichoderma spp. was done through ITS1 and ITS2 regions, separated by the 5.8S ribosomal RNA gene (ITS, Internal Transcribed Spacer). The antagonism was evaluated using the modified cellophane method and dual cultures to estimate the percentage of radial growth inhibition (PRGI). Seven Trichoderma strains identified using molecular techniques showed 95-100 % identity to T. harzianum and T. asperellum. Trichoderma strains showed high antagonistic capacity with 73.1 to 76.4 mean PRGI values in pathogenic strains, suggesting an antibiosis effect (77.6 PRGI) and different hyphal interaction types. Antagonistic strains were statistically similar for pathogen growth and development inhibition; however, T. asperellum&#8217;s antagonistic values were higher than T. harzianum&#8217;s with regard to all pathogenic strains, even R. solani, which was the most aggressive pathogen for cv. Montcalm (mean value: 7.0). The antagonistic effect of Trichoderma strains on phytopathogenic fungi was determined with in vitro tests and corroborated with in vivo bioassays with similar inhibition percentages.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Trichoderma spp.]]></kwd>
<kwd lng="es"><![CDATA[Rhizoctonia solani]]></kwd>
<kwd lng="es"><![CDATA[Fusariumox ysporum]]></kwd>
<kwd lng="es"><![CDATA[F. verticillioides]]></kwd>
<kwd lng="es"><![CDATA[F. solani]]></kwd>
<kwd lng="es"><![CDATA[antagonismo]]></kwd>
<kwd lng="es"><![CDATA[micoparasitismo]]></kwd>
<kwd lng="en"><![CDATA[Trichoderma spp.]]></kwd>
<kwd lng="en"><![CDATA[Rhizoctonia solani]]></kwd>
<kwd lng="en"><![CDATA[Fusariumox ysporum]]></kwd>
<kwd lng="en"><![CDATA[F. verticillioides]]></kwd>
<kwd lng="en"><![CDATA[F. solani]]></kwd>
<kwd lng="en"><![CDATA[antagonism]]></kwd>
<kwd lng="en"><![CDATA[mycoparasitism]]></kwd>
</kwd-group>
</article-meta>
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