<?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>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802021000200251</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2021.2.251</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Grano de maíz comercializado en México como potencial dispersor de eventos transgénicos]]></article-title>
<article-title xml:lang="en"><![CDATA[Corn grain commercialized in Mexico as a potential disperser of transgenic events]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trejo-Pastor]]></surname>
<given-names><![CDATA[Viridiana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinosa-Calderón]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Castillo]]></surname>
<given-names><![CDATA[Ma. del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kato-Yamakake]]></surname>
<given-names><![CDATA[Takeo Á.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales-Floriano]]></surname>
<given-names><![CDATA[Maria Luisa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tadeo-Robledo]]></surname>
<given-names><![CDATA[Margarita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Wegier]]></surname>
<given-names><![CDATA[Ana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Campo Experimental Valle de México ]]></institution>
<addr-line><![CDATA[Coatlinchán Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Cuautitlán ]]></institution>
<addr-line><![CDATA[Cuautitlán Izcalli Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología Jardín Botánico]]></institution>
<addr-line><![CDATA[ CDMX]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>44</volume>
<numero>2</numero>
<fpage>251</fpage>
<lpage>259</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802021000200251&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802021000200251&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802021000200251&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Conservar la diversidad del maíz sin transgenes será posible cuando se entiendan las fuentes de introgresión y dispersión de estos genes modificados. El objetivo de este estudio fue analizar la presencia de transgenes en granos y semillas de maíz comercializados en México, por considerarse como potenciales dispersores de eventos transgénicos. Se recolectaron 40 muestras de granos y semillas de híbridos comercializados en México en parcelas de producción o comercializados de origen nacional e importado. Se sembraron en campo 300 semillas por genotipo y cuando se encontraban en etapa V4-V5 de desarrollo foliar se les asperjó glifosato, evaluando 15 días después su efecto. Con base en la frecuencia de resistencia (FR) y nivel de daño se seleccionaron genotipos para ser evaluados con inmunoensayos ELISA para detección de la proteína recombinante CP4/EPSPS y una prueba basada en ADN para detección de presencia/ausencia de P35S de CaMV y TNOS de A. tumefaciens por qPCR. Las muestras que resultaron positivas para P35S y TNOS se enviaron al Centro Nacional de Referencia de Organismos Genéticamente Modificados (CNRDOGM) para su validación y detección de eventos específicos, y se estimaron los porcentajes de eventos de secuencias modificadas contenidos en las muestras positivas. Cuatro híbridos mostraron la mayor resistencia a glifosato en campo (FR &#8804; 0.26). En los ensayos ELISA y qPCR los granos del híbrido Jabalí y el importado fueron positivos para la introgresión de transgénicos. Se confirmó la presencia de los eventos MON89034, TC1507 y MON810 (&lt; 0.1 % en cada caso) en grano del híbrido Jabalí, así como los eventos MON89034, MON810, MON880017, NK603, TC1507, Bt11, GA21 y MIR162 (26.42, 2.28, 0.16, 18.13, &gt; 10.0, 8.67, 0.78 y 4.78 %, respectivamente) en el grano importado. La presencia de eventos específicos en granos comercializados quedó comprobada como vía potencial de dispersión de transgenes al maíz nativo, resaltando que estos granos nacionales e importados son semillas funcionales, que conservan su capacidad de desarrollo y de expresión de proteínas recombinantes para resistencia a glifosato.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY Preserving diversity of maize without transgenes would be possible so long as the sources of introgression and dispersion of modified genes are understood. The objective of this study was to analyze the presence of transgenes in maize grains and seeds marketed in Mexico, as they are considered potential dispersers of transgenic events. Forty samples of grains and seeds of hybrids commercialized in Mexico were collected from production plots or sold commercially from domestic and imported origin. Three hundred seeds per genotype were sown in the field and when they were in the V4-V5 stage of foliar development glyphosate was sprayed on them evaluating the effect 15 days later. Based on the Resistance Frequency (RF) and damage level, genotypes were selected to be evaluated with ELISA immunoassays for recombinant protein CP4/EPSPS detection and a DNA-based test for presence/absence of P35S of CaMV and TNOS of A. tumefaciens by qPCR. The samples that tested positive for the presence of P35S and TNOS were sent to the National Reference Center for Genetically Modified Organisms (CNRDOGM) for validation and detection of specific events of modified sequences contained in the positive samples. Four hybrids showed the highest resistance to glyphosate in the field (RF &#8804; 0.26). In the ELISA and qPCR tests the grain samples of the Jabalí hybrid and imported were positive for transgenic introgression. The presence of the events MON89034, TC1507 and MON810 (&lt; 0.1 % in each case) was confirmed in grain of the hybrid Jabalí, as well as the events MON89034, MON810, MON88017, NK603, TC1507, Bt11, GA21 and MIR162 (26.42, 2.28, 0.16, 18.13, &gt; 10.0, 8.67, 0.78 and 4.78 %, respectively) in imported grain. The presence of specific events in commercialized grains was confirmed as a potential pathway for dispersal of transgenes to native maize, highlighting that these grains, both national and imported, are functional seeds, which retain their ability to develop and express recombinant proteins for glyphosate resistance.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="es"><![CDATA[ELISA]]></kwd>
<kwd lng="es"><![CDATA[maíz genéticamente modificado]]></kwd>
<kwd lng="es"><![CDATA[maíz híbrido]]></kwd>
<kwd lng="es"><![CDATA[resistencia a glifosato]]></kwd>
<kwd lng="en"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="en"><![CDATA[ELISA]]></kwd>
<kwd lng="en"><![CDATA[genetically modified maize]]></kwd>
<kwd lng="en"><![CDATA[glyphosate resistance]]></kwd>
<kwd lng="en"><![CDATA[hybrid maize]]></kwd>
</kwd-group>
</article-meta>
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