<?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>S1405-31952015000700003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Detección de la proteína CP4 EPSPS en plantas arvenses en cultivos de algodón (Gossypium hirsutum) transgénico en la Comarca Lagunera, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Detection of CP4 EPSPS protein in weed flora in transgenic cotton (Gossypium birsutum) crops in Comarca Lagunera, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Márquez-Hernández]]></surname>
<given-names><![CDATA[Cándido]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Puente-Valenzuela]]></surname>
<given-names><![CDATA[C. Omar]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muro-Perez]]></surname>
<given-names><![CDATA[Gisela]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Hernández]]></surname>
<given-names><![CDATA[J. Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rueda-Puente]]></surname>
<given-names><![CDATA[E. Omar]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno-Hernández]]></surname>
<given-names><![CDATA[A. Noé]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Juárez del Estado de Durango Facultad de Ciencias Biológicas ]]></institution>
<addr-line><![CDATA[Gómez Palacio Durango]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Juárez del Estado de Durango Facultad de Agricultura y Zootecnia ]]></institution>
<addr-line><![CDATA[Durango ]]></addr-line>
<country>México</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Sonora  ]]></institution>
<addr-line><![CDATA[Hermosillo Sonora]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>11</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>11</month>
<year>2015</year>
</pub-date>
<volume>49</volume>
<numero>7</numero>
<fpage>739</fpage>
<lpage>747</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952015000700003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952015000700003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952015000700003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El flujo génico se puede presentar entre especies de plantas silvestres y cultivadas. Las interacciones entre el algodón (Gossypium hirsutum), plantas arvenses y la familia Malvacea no son excepciones. Hay evidencias de flujo génico entre cultivos genéticamente modificados y plantas silvestres. La probabilidad del aumento de flujo de genes en el algodón transgénico ha aumentado porque se ha sembrado en el área durante 18 años. El objetivo de este estudio fue detectar la presencia de la proteína CP4 EPSPS en plantas arvenses en cultivos de algodón transgénico en Coahuila y Durango, México. En Durango y Coahuila se obtuvieron 15 y 20 especies de arvenses de 10 familias botánicas: Amaranthaceae, Asteraceae, Chenopodiaceae, Convolvulaceae, Euphorbiaceae, Fabacea, Malvaceae, Nyctaginaceae, Poaceae y Solanaceae; ocho de ellas se encontraron en ambos estados. Malvastrum coromandelianu, Sphaeralcea angustifolia, Anoda cristata y Sida hederacea son especies de la familia Malvaceae y se identificaron en la Comarca Lagunera. La proteína CP4 EPSPS no se detectó en las plantas arvenses presentes en el agroecosistema de algodón transgénico en la Comarca Lagunera.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Gene flow can appear among wild and cultivated plant species. The interactions among cotton (Gossypium birsutum), weed flora and the Malvacea family are not exceptions. There are evidences of gene flow among genetically modified crops and wild plants. The probability of greater gene flow in transgenic cotton has increased, given that it has been sown in the area during 18 years. The objective of the present study was to detect the presence of the CP4 EPSPS protein in weed flora in transgenic cotton crops in Coahuila and Durango, Mexico. In Durango and Coahuila 15 and 20 weed species of 10 botanical families were obtained: Amaranthaceae, Asteraceae, Chenopodiaceae, Convolvulaceae, Euphorbiaceae, Fabaceae, Malvaceae, Nyctaginaceae, Poaceae and Solanaceae; eight of these were found in both states. Malvastrum coromandelianu, Sphaeralcea angustifolia, Anoda cristata and Sida hederaceae are species of the Malvaceae family and were identified in the Comarca Lagunera. The CP4 EPSPS protein was not detected in weed plants present in the agrosystem of transgenic cotton in the Comarca Lagunera.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Organismos genéticamente modificados]]></kwd>
<kwd lng="es"><![CDATA[proteínas transgénicas]]></kwd>
<kwd lng="es"><![CDATA[biodiversidad]]></kwd>
<kwd lng="es"><![CDATA[listados florísticos]]></kwd>
<kwd lng="es"><![CDATA[contaminación cruzada]]></kwd>
<kwd lng="es"><![CDATA[flujo génico]]></kwd>
<kwd lng="en"><![CDATA[Genetically modified organisms]]></kwd>
<kwd lng="en"><![CDATA[transgenic proteins]]></kwd>
<kwd lng="en"><![CDATA[biodiversity]]></kwd>
<kwd lng="en"><![CDATA[floristic lists]]></kwd>
<kwd lng="en"><![CDATA[cross contamination]]></kwd>
<kwd lng="en"><![CDATA[gene flow]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Biotecnolog&iacute;a</font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Detecci&oacute;n de la prote&iacute;na CP4 EPSPS en plantas arvenses en cultivos de algod&oacute;n (<i>Gossypium hirsutum</i>) transg&eacute;nico en la Comarca Lagunera, M&eacute;xico</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="3"><b>Detection of CP4 EPSPS protein in weed flora in transgenic cotton (<i>Gossypium birsutum</i>) crops in Comarca Lagunera, M&eacute;xico</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>C&aacute;ndido M&aacute;rquez&#45;Hern&aacute;ndez<sup>1*</sup>, C. Omar Puente&#45;Valenzuela<sup>1</sup>, Gisela Muro&#45;Perez<sup>1</sup>, J. Luis Garc&iacute;a&#45;Hern&aacute;ndez<sup>2</sup>, E. Omar</b> <b>Rueda&#45;Puente<sup>3</sup>, A. No&eacute; Moreno&#45;Hern&aacute;ndez<sup>2</sup></b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>1</i></sup> <i>Facultad de Ciencias Biol&oacute;gicas. Universidad Ju&aacute;rez del Estado de Durango (UJED). Avenida Universidad s/n. Fraccionamiento Filadelfia. G&oacute;mez Palacio, Durango. M&eacute;xico. * Autor responsable.</i> (<a href="mailto:canomh2@yahoo.com.mx">canomh2@yahoo.com.mx</a>).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><sup><i>2</i></sup> <i>Facultad de Agricultura y Zootecnia. UJED.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>3</i></sup> <i>Domicilio Conocido. Venecia, Durango. M&eacute;xico. Universidad de Sonora. Bulevard. Luis Encinas y Rosales s/n. Colonia Centro. Hermosillo, Sonora.</i></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">Recibido: abril, 2015.    <br> 	Aprobado: julio, 2015.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El flujo g&eacute;nico se puede presentar entre especies de plantas silvestres y cultivadas. Las interacciones entre el algod&oacute;n <i>(Gossypium hirsutum),</i> plantas arvenses y la familia Malvacea no son excepciones. Hay evidencias de flujo g&eacute;nico entre cultivos gen&eacute;ticamente modificados y plantas silvestres. La probabilidad del aumento de flujo de genes en el algod&oacute;n transg&eacute;nico ha aumentado porque se ha sembrado en el &aacute;rea durante 18 a&ntilde;os. El objetivo de este estudio fue detectar la presencia de la prote&iacute;na CP4 EPSPS en plantas arvenses en cultivos de algod&oacute;n transg&eacute;nico en Coahuila y Durango, M&eacute;xico. En Durango y Coahuila se obtuvieron 15 y 20 especies de arvenses de 10 familias bot&aacute;nicas: Amaranthaceae, Asteraceae, Chenopodiaceae, Convolvulaceae, Euphorbiaceae, Fabacea, Malvaceae, Nyctaginaceae, Poaceae y Solanaceae; ocho de ellas se encontraron en ambos estados. <i>Malvastrum coromandelianu, Sphaeralcea angustifolia, Anoda cristata</i> y <i>Sida hederacea</i> son especies de la familia Malvaceae y se identificaron en la Comarca Lagunera. La prote&iacute;na CP4 EPSPS no se detect&oacute; en las plantas arvenses presentes en el agroecosistema de algod&oacute;n transg&eacute;nico en la Comarca Lagunera.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras claves:</b> Organismos gen&eacute;ticamente modificados, prote&iacute;nas transg&eacute;nicas, biodiversidad, listados flor&iacute;sticos, contaminaci&oacute;n cruzada, flujo g&eacute;nico.</font></p>  	    <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Gene flow can appear among wild and cultivated plant species. The interactions among cotton <i>(Gossypium birsutum),</i> weed flora and the Malvacea family are not exceptions. There are evidences of gene flow among genetically modified crops and wild plants. The probability of greater gene flow in transgenic cotton has increased, given that it has been sown in the area during 18 years. The objective of the present study was to detect the presence of the CP4 EPSPS protein in weed flora in transgenic cotton crops in Coahuila and Durango, Mexico. In Durango and Coahuila 15 and 20 weed species of 10 botanical families were obtained: Amaranthaceae, Asteraceae, Chenopodiaceae, Convolvulaceae, Euphorbiaceae, Fabaceae, Malvaceae, Nyctaginaceae, Poaceae and Solanaceae; eight of these were found in both states. <i>Malvastrum coromandelianu, Sphaeralcea angustifolia, Anoda cristata</i> and <i>Sida hederaceae</i> are species of the Malvaceae family and were identified in the Comarca Lagunera. The CP4 EPSPS protein was not detected in weed plants present in the agrosystem of transgenic cotton in the Comarca Lagunera.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Genetically modified organisms, transgenic proteins, biodiversity, floristic lists, cross contamination, gene flow.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Las arvenses son las plantas de la flora completa de un agroecosistema (Zamorano, 2006) y las malezas son plantas no deseadas presentes en los cultivos, que pueden causar un da&ntilde;o econ&oacute;mico. La mayor&iacute;a de las investigaciones flor&iacute;sticas en agroecosistemas se limitan al an&aacute;lisis de malezas (Molina <i>et al.</i> 2008), pero tambi&eacute;n se han estudiado las plantas arvenses en diversos agroecosistemas (Masalles, 2004; Blanco y Leyva, 2007; S&aacute;nchez y Guevara, 2013), como el cultivo de algod&oacute;n (B&uuml;k&uuml;n, 2005; Economou <i>et al.,</i> 2005).</font></p>  	    <p align="justify"><font face="verdana" size="2">El flujo g&eacute;nico es el cambio en la frecuencia de alelos por el movimiento de gametos de una poblaci&oacute;n a otra (Slatkin, 1987; Snow, 2002), y existe evidencia del flujo g&eacute;nico en ecosistemas naturales (Ellstrand <i>et al,</i> 1999; Belanger <i>et al,</i> 2003; Ellstrand 2003) y en distintos agroecosistemas (Hall <i>et al.,</i> 2000; Hegde y Waines, 2004; Downey, 2006).</font></p>  	    <p align="justify"><font face="verdana" size="2">El flujo de genes de cultivos gen&eacute;ticamente modificados a especies silvestres fue estudiado (Rieseberg <i>et al.,</i> 2003; Stewart <i>et al.,</i> 2003; Warwick <i>et al.,</i> 2003), as&iacute; como la posible persistencia de los transgenes en la naturaleza (Warwick <i>et al.,</i> 2008). Bjerknes <i>et al.</i> (2007) realizaron estudios de polinizaci&oacute;n entre plantas cultivadas y plantas nativas; otros autores estudiaron polinizaci&oacute;n en especies transg&eacute;nicas (Rieger <i>et al.,</i> 2002; Hoyle y Cresswell, 2007) y en M&eacute;xico (Quist y Chapela, 2001).</font></p>  	    <p align="justify"><font face="verdana" size="2">El algod&oacute;n y las plantas arvenses pueden ser espec&iacute;ficas para uno o varios polinizadores (G&oacute;mez, 2002); el polen del algod&oacute;n debe ser transportado por insectos, presentes en el algod&oacute;n (M&aacute;rquez <i>et al.,</i> 2014; Santana <i>et al.,</i> 2015), hacia las plantas arvenses, fomentando la polinizaci&oacute;n. Seg&uacute;n Freire (2002), es posible la cruza de algod&oacute;n transg&eacute;nico con el convencional y con los nativos.</font></p>  	    <p align="justify"><font face="verdana" size="2">La familia de enzimas 5&#45;enolpiruvil shikimato&#45;3&#45;fosfato sintasa (EPSPS) se encuentra en las plantas y los microorganismos. Las prote&iacute;nas EPSPS (5&#45;enol&#45;piruvil shikimato&#45;3&#45;fosfato sintasa) catalizan la transferencia del grupo enolpiruvil desde el fosfenol piruvato (PEP) al 5&#45;hidroxil de shikimato&#45;3&#45;fosfato (S3P) y producen fosfato inorg&aacute;nico y 5&#45;enolpiruvil shikimato&#45;3&#45;fosfato. En las plantas sin tolerancia al glifosato, se une la enzima end&oacute;gena EPSPS con el glifosato y bloquea la bios&iacute;ntesis de 5&#45;enolpiruvil&#45;shikimato&#45;3&#45;fosfato y, por ende, priva a las plantas de amino&aacute;cidos esenciales y de metabolitos secundarios. La prote&iacute;na CP4 EPSPS expresada en las plantas GM con tolerancia al glifosato es equivalente funcionalmente a las enzimas EPSPS end&oacute;genas, con la excepci&oacute;n de que la CP4 EPSPS presenta afinidad reducida con el glifosato, prefiriendo PEP, por lo que la enzima CP4 EPSPS continua funcionando en presencia del glifosato y produce los amino&aacute;cidos arom&aacute;ticos y dem&aacute;s metabolitos necesarios para el crecimiento y el desarrollo normal de la planta (Steinrucken y Amrhein, 1980; Franz <i>et al.</i> 1997; Alibhai y Stallings, 2001; Center Environmental Risk Assessment, 2010; Zhang, 2015).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Doce pa&iacute;ses han aprobado la liberaci&oacute;n al ambiente de al menos una de 30 l&iacute;neas de plantas con la prote&iacute;na CP4 EPSPS de siete especies de plantas. Los mecanismos principales por los cuales se puede introducir a la CP4 EPSPS en un ambiente no agr&iacute;cola son: movimiento de semillas o prop&aacute;gulos y establecimiento de la planta GM fuera de las &aacute;reas cultivadas as&iacute; como el flujo de genes desde la planta GM hasta una poblaci&oacute;n naturalizada (o asilvestrada) de la misma especie de cultivo o a otros familiares compatibles sexualmente (Center Environmental Risk Assessment, 2010).</font></p>  	    <p align="justify"><font face="verdana" size="2">Para el agroecosistema algod&oacute;n en M&eacute;xico, se han registrado 118 especies de malezas (Villase&ntilde;or y Espinoza, 1998), mientras que en la Comarca Lagunera hay 20 malezas de nueve familias bot&aacute;nicas (Instituto Nacional de Investigaciones Agr&iacute;colas, 1970; Garc&iacute;a y Acosta, 1975; Campo Agr&iacute;cola Experimental La Laguna, 1984; Castro, 1992). Seg&uacute;n Villase&ntilde;or y Espinoza (1998), hay una flora de 76 especies asociadas al algod&oacute;n en Coahuila y85 en Durango.</font></p>  	    <p align="justify"><font face="verdana" size="2">Lo anterior se agudiza ya que el algod&oacute;n transg&eacute;nico se cultiva en M&eacute;xico desde en 1996 y al existir cruzamientos entre cultivos y plantas silvestres, es posible que las plantas arvenses contengan la prote&iacute;na CP4 EPSPS. Por lo tanto, el objetivo del presente estudio fue determinar si las plantas arvenses de la Comarca Lagunera, asociadas al algod&oacute;n transg&eacute;nico contienen la prote&iacute;na CP4 EPSPS.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>MATERIALES Y M&Eacute;TODOS</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>&Aacute;rea de estudio</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Este estudio se realiz&oacute; en la Comarca Lagunera que incluye partes de los estados de Coahuila y Durango. En el estado de Durango, la parcela experimental se ubic&oacute; en el municipio de G&oacute;mez Palacio, el ejido Gregorio Garc&iacute;a (25&deg; 45' 51.65" N y 103&deg; 20' 34.68" O); para el estado de Coahuila, la parcela experimental se estableci&oacute; en el ejido La Fe (25&deg; 49' 1.74" N y 103&deg; 12' 36.25" O) (<a href="#f1">Figura 1</a>).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/agro/v49n7/a3f1.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">Dos hect&aacute;reas en cada ejido se cultivaron durante el ciclo agr&iacute;cola 2011 y se utiliz&oacute; el genotipo de algod&oacute;n transg&eacute;nico Bollgard II<sup>&reg;</sup> con resistencia a insectos y tolerante a herbicidas.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Listado de plantas arvenses</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La recolecta consisti&oacute; en tomar un ejemplar de cada una de las especies de plantas presentes en la parcela experimental de algod&oacute;n transg&eacute;nico en cada uno de los ejidos de la Comarca Lagunera. Los ejemplares se trasladaron al Laboratorio de Biolog&iacute;a Agr&iacute;cola de la Facultad de Ciencias Biol&oacute;gicas de la Universidad Ju&aacute;rez del Estado de Durango, donde se realiz&oacute; la identificaci&oacute;n bot&aacute;nica usando claves especializadas (Villareal, 1983; Lot y Chiang, 1986; Villase&ntilde;or y Espinosa, 1998; Elpel, 2000).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Prueba inmunol&oacute;gica</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En cada especie recolectada en la parcela experimental de cada estado, se realiz&oacute; la prueba para detectar la prote&iacute;na CP4 EPSPS, y el genotipo de algod&oacute;n que sirvi&oacute; como testigo.</font></p>  	    <p align="justify"><font face="verdana" size="2">La prueba tuvo tres pasos: obtener la muestra del tejido vegetal; aplicar la t&eacute;cnica DAS&#45;ELISA con tiras de flujo lateral con el QuickStix TM Combo Kit for Bollgard ll R / Roundup Ready Rr. Leaff y sedd (EnviroLogix, Portland, ME, USA) usadas por Huang <i>et al.</i> (2007) y Yue <i>et al.</i> (2008); y lectura de los resultados.</font></p>  	    <p align="justify"><font face="verdana" size="2">Para obtener la muestra de tejido vegetal, se cort&oacute; una secci&oacute;n del tejido con el tubo eppendorf, se coloco el tejido entre la boca del tubo eppendorf y el broche de presi&oacute;n. Al cerrarlo el tejido qued&oacute; en el tubo eppendorf, y se empuj&oacute; hacia la parte inferior c&oacute;nica con un agitador.</font></p>  	    <p align="justify"><font face="verdana" size="2">La prueba inmunol&oacute;gica consisti&oacute; en verter 0.5 mL de soluci&oacute;n amortiguador a un tubo eppendorf que conten&iacute;a la muestra, se insert&oacute; el agitador en el tubo eppendorf y se macer&oacute; el tejido hasta quedar completamente triturado. Despu&eacute;s se aplic&oacute; la prueba DAS&#45;ELISA con el QuickStix TM Combo Kit for Bollgard ll R / Roundup Ready Rr. Leaff y sedd: introducir la tira que detecta la presencia de la prote&iacute;na CP4 EPSPS, al tubo eppendorf. La presencia de la prote&iacute;na CP4 EPSPS en las muestras fue positiva solo si la tira presentara dos franjas reveladas; la primera como testigo de la reacci&oacute;n ant&iacute;geno &#151; anticuerpo, y la segunda como detecci&oacute;n de la prote&iacute;na CP4 EPSPS.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>RESULTADOS Y DISCUSI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Listado de plantas arvenses</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El listado flor&iacute;stico obtenido fue de 22 plantas arvenses pertenecientes a 10 familias bot&aacute;nicas. Las plantas arvenses presentes en el estado de Durango fueron 15 especies, y en el estado de Coahuila fueron 20 especies de plantas arvenses, pertenecientes a ocho y diez familias bot&aacute;nicas, respectivamente (<a href="#c1">Cuadro 1</a> y <a href="#c2">2</a>). Esta cantidad de plantas arvenses presentes supera al n&uacute;mero de malezas mencionadas para la Comarca Lagunera (Instituto Nacional de Investigaciones Agr&iacute;colas, 1970; Garc&iacute;a y Acosta, 1975; Campo Agr&iacute;cola Experimental La Laguna, 1984; Castro, 1992). Pero Villase&ntilde;or y Espinoza (1998) se&ntilde;alan un n&uacute;mero mayor de especies vegetales asociadas al algod&oacute;n en los estados de Coahuila y Durango.</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="c1"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/agro/v49n7/a3c1.jpg"></font></p>  	    <p align="center"><font face="verdana" size="2"><a name="c2"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/agro/v49n7/a3c2.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">Las especies de plantas arvenses similares en ambos estados fueron 14; mientras que una y seis especies, respectivamente, para Durango y Coahuila no se encontraron en el otro estado (<a href="#c1">Cuadro 1</a> y <a href="#c2">2</a>). Las diferencias se deben a la variabilidad espacial y temporal de las comunidades, as&iacute; como a la labranza, la rotaci&oacute;n de cultivos y otras perturbaciones (Booth y Swanton, 2002; Perdomo <i>et al.,</i> 2004). Seg&uacute;n Dauber <i>et al.</i> (2003), la composici&oacute;n flor&iacute;stica est&aacute; estrechamente correlacionada con las condiciones ambientales, pr&aacute;cticas de cultivo y riqueza flor&iacute;stica del entorno, es decir, las caracter&iacute;sticas del h&aacute;bitat son un factor importante que determina la presencia de especies en un sitio.</font></p>  	    <p align="justify"><font face="verdana" size="2">Cuatro especies de la familia Malvaceae fueron encontradas: <i>Malvastrum coromandelianu, Sphaeralcea angustifolia, Anoda cristata</i> y <i>Sida hederacea;</i> y potencialmente son m&aacute;s susceptibles de presentar flujo g&eacute;nico con algod&oacute;n CERA (2010).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Detecci&oacute;n de la prote&iacute;na CP4 EPSPS</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Las pruebas con las tiras de flujo lateral detectaron la prote&iacute;na CP4 EPSPS. Ninguna planta arvense fue positiva a la presencia de la prote&iacute;na CP4 EPSPS, y solo fue positiva a la prote&iacute;na el algod&oacute;n transg&eacute;nico. Esto indic&oacute; que a&uacute;n no se ha presentado flujo de genes entre el algod&oacute;n y las plantas arvenses, ya que las plantas arvenses no presentan la prote&iacute;na CP4 EPSPS (<a href="#c1">Cuadro 1</a> y <a href="#c2">2</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2">La no detecci&oacute;n de la prote&iacute;na CP4 EPSPS en plantas arvenses de la Comarca Lagunera probablemente se debe a un deficiente transporte de polen por los insectos (G&oacute;mez, 2002; Guzm&aacute;n <i>et al.,</i> 2008), o tal vez fue eficiente pero existi&oacute; incompatibilidad sexual (Center Environmental Risk Assessment, 2010). Otras causas probables son: los dos tipos parentales no son sexualmente compatibles o bien, sus complementos cromos&oacute;micos; la no coincidencia entre las especies en cuanto a sus periodos de fertilidad; la descendencia no es f&eacute;rtil o ecol&oacute;gicamente no es apta para las condiciones ambientales en las cuales se encuentran (CERA, 2010; RASM, 2010; Mallory <i>et al.,</i> 2015).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">No se encontr&oacute; la introgresi&oacute;n de la tolerancia al glifosato en poblaciones de plantas arvenses (Warwick <i>et al.,</i> 2008; Mallory y Zapiola, 2008; CERA, 2010,) en las plantas arvenses asociadas al algod&oacute;n transg&eacute;nico en la Comarca lagunera.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>CONCLUSIONES</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El n&uacute;mero de especies vegetales asociadas al algod&oacute;n fue mayor a las antes reportadas para la Comarca Lagunera; adem&aacute;s hubo un n&uacute;mero mayor de familias bot&aacute;nicas. La prote&iacute;na CP4 EPSPS no se detect&oacute; en las plantas arvenses, a pesar de la presencia de las cuatro especies de la familia Malvaceae en la Comarca Lagunera.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>LITERATURA CITADA</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Belanger, F., C., R. Meagher T., R. Day P., K. Plumley, and A. Meyer W. 2003. Interspecific hybridization between <i>Agrostis stolonifera</i> and related <i>Agrostis</i> species under field conditions. Crop Sci. 43: 240&#151;246.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=603238&pid=S1405-3195201500070000300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Alibhai, M., F., and C. Stallings W. 2001. Closing down on glyphosate inhibition &#151; with a new structure for drug discovery. Proc. Natl. Acad. Sci. USA 98: 2944&#45;2946.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=603240&pid=S1405-3195201500070000300002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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