<?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>2007-1132</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias forestales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. forestales]]></abbrev-journal-title>
<issn>2007-1132</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11322012000400007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Perfiles de RAPD asociados con la resistencia a la intensidad luminosa alta en brinzales]]></article-title>
<article-title xml:lang="en"><![CDATA[RAPDs profiles associated to the resistance to high light intensity of poles]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez-Moctezuma]]></surname>
<given-names><![CDATA[José Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-Reyes]]></surname>
<given-names><![CDATA[Alma Delia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sahagún-Castellanos]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peña-Lomelí]]></surname>
<given-names><![CDATA[Aureliano]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Fitotecnia ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2012</year>
</pub-date>
<volume>3</volume>
<numero>12</numero>
<fpage>71</fpage>
<lpage>86</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11322012000400007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11322012000400007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11322012000400007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Abies religiosa tiene gran potencial para utilizarse como árbol urbano, árbol de Navidad, bonsai, para obtención de madera y celulosa, construcción de techos, medicina y para secuestro de carbono. Sus plantaciones requieren de cobertura arbórea, porque es tolerante a la sombra y sus brinzales son susceptibles a la intensidad luminosa alta. Aunque, muestra variación intraespecífica natural y variación fenotípica interespecífica, a esta variable. El objetivo del presente estudio fue detectar el perfil RAPD asociado con la resistencia a la intensidad luminosa alta en brinzales de A. religiosa. Se aisló ADN de 15 brinzales resistentes y 15 susceptibles a dicha condición, y se evaluaron 35 iniciadores en dos muestras compuestas. De aquellos con productos de PCR, se realizó una segunda reacción con ADN de brinzales individuales. Las variables consideradas fueron supervivencia del brinzal a la intensidad luminosa alta, número de hojas, apertura estomatal, número de estomas y altura del brinzal. Se calcularon las correlaciones entre esas variables y los perfiles de RAPD. Se detectaron bandas que correlacionaron con las variables. La supervivencia de los brinzales alcanzó un valor de 24 %. El ancho y apertura estomatal tuvieron mayor cantidad de correlaciones. La banda 1801.92 pb del iniciador 5'-CCGGCCTTCC-3' se correlacionó con casi todas las variables. La supervivencia está determinada, principalmente, por la apertura de los estomas; estas, así como la altura y el número de hojas están controladas genéticamente.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abies religiosa has great potential as urban forest tree, Christmas-tree, bonsai, timber, paper, ceiling, medicinal, and carbon sequestration. However, plantations are not possible without tree covering, because this species is shade tolerant, and their seedlings are susceptible to high intensity light. Nevertheless, A. religiosa shows natural intraspecific variation in resistance to high intensity light. Because of this and because exist interspecific phenotipic variation for resistance to high intensity light. The probability that there is a genetic basis for the intraspecific variation must be high. The aim of this study was to detect RAPD profiles associated with resistance to high intensity light on A. religiosa seedlings. The DNA from 15 resistant and 15 susceptible seedlings to high intensity light were isolated. Two bulked samples were formed and 35 primers were evaluated. From primers with PCR products, a second PCR reaction with DNA from individual seedlings was done. Registered data were: seedling survival to high intensity light, leaf number, stomata aperture, stomata number, and plant height. Correlations between these variables, and RAPDs profiles for each primer were computed. Bands which correlated with all variables were detected. 24 % of the seedlings survived to high intensity light. Stomata width and aperture showed the largest number of correlations. The 1801.92 pb band from primer 5'-CCGGCCTTCC-3' was correlated with almost all variables. This suggests that survival, height, leaf number, and stomata aperture are genetically controlled variables. Seedling survival to high intensity light is mainly determined by stomata aperture.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Abies religiosa (Kunth) Schltdl. et Cham.]]></kwd>
<kwd lng="es"><![CDATA[apertura estomatal]]></kwd>
<kwd lng="es"><![CDATA[estoma]]></kwd>
<kwd lng="es"><![CDATA[marcador molecular]]></kwd>
<kwd lng="es"><![CDATA[planta umbrófila]]></kwd>
<kwd lng="es"><![CDATA[selección asistida]]></kwd>
<kwd lng="en"><![CDATA[Abies religiosa (Kunth) Schltdl. et Cham.]]></kwd>
<kwd lng="en"><![CDATA[stomata aperture]]></kwd>
<kwd lng="en"><![CDATA[stomata]]></kwd>
<kwd lng="en"><![CDATA[molecular marker]]></kwd>
<kwd lng="en"><![CDATA[umbraphyla plant]]></kwd>
<kwd lng="en"><![CDATA[assisted selection]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Art&iacute;culos</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Perfiles de RAPD asociados con la resistencia a la intensidad luminosa alta en brinzales</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>RAPDs profiles associated to the resistance to high light intensity of poles</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Jos&eacute; Guadalupe &Aacute;lvarez&#45;Moctezuma<sup>1</sup>, Alma Delia Ortiz&#45;Reyes<sup>1</sup>, Jaime Sahag&uacute;n&#45;Castellanos<sup>1</sup> y Aureliano Pe&ntilde;a&#45;Lomel&iacute;<sup>1</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><sup><i>1</i></sup><i>Departamento de Fitotecnia. Universidad Aut&oacute;noma Chapingo.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Fecha de recepci&oacute;n: 13 de noviembre de 2007;<br /> 	Fecha de aceptaci&oacute;n: 19 de abril de 2012</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Abies religiosa</i> tiene gran potencial para utilizarse como &aacute;rbol urbano, &aacute;rbol de Navidad, bonsai, para obtenci&oacute;n de madera y celulosa, construcci&oacute;n de techos, medicina y para secuestro de carbono. Sus plantaciones requieren de cobertura arb&oacute;rea, porque es tolerante a la sombra y sus brinzales son susceptibles a la intensidad luminosa alta. Aunque, muestra variaci&oacute;n intraespec&iacute;fica natural y variaci&oacute;n fenot&iacute;pica interespec&iacute;fica, a esta variable. El objetivo del presente estudio fue detectar el perfil RAPD asociado con la resistencia a la intensidad luminosa alta en brinzales de <i>A. religiosa.</i> Se aisl&oacute; ADN de 15 brinzales resistentes y 15 susceptibles a dicha condici&oacute;n, y se evaluaron 35 iniciadores en dos muestras compuestas. De aquellos con productos de PCR, se realiz&oacute; una segunda reacci&oacute;n con ADN de brinzales individuales. Las variables consideradas fueron supervivencia del brinzal a la intensidad luminosa alta, n&uacute;mero de hojas, apertura estomatal, n&uacute;mero de estomas y altura del brinzal. Se calcularon las correlaciones entre esas variables y los perfiles de RAPD. Se detectaron bandas que correlacionaron con las variables. La supervivencia de los brinzales alcanz&oacute; un valor de 24 %. El ancho y apertura estomatal tuvieron mayor cantidad de correlaciones. La banda 1801.92 pb del iniciador 5'&#45;CCGGCCTTCC&#45;3' se correlacion&oacute; con casi todas las variables. La supervivencia est&aacute; determinada, principalmente, por la apertura de los estomas; estas, as&iacute; como la altura y el n&uacute;mero de hojas est&aacute;n controladas gen&eacute;ticamente.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> <i>Abies religiosa</i> (Kunth) Schltdl. et Cham., apertura estomatal, estoma, marcador molecular, planta umbr&oacute;fila, selecci&oacute;n asistida.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Abies religiosa</i> has great potential as urban forest tree, Christmas&#45;tree, bonsai, timber, paper, ceiling, medicinal, and carbon sequestration. However, plantations are not possible without tree covering, because this species is shade tolerant, and their seedlings are susceptible to high intensity light. Nevertheless, <i>A. religiosa</i> shows natural intraspecific variation in resistance to high intensity light. Because of this and because exist interspecific phenotipic variation for resistance to high intensity light. The probability that there is a genetic basis for the intraspecific variation must be high. The aim of this study was to detect RAPD profiles associated with resistance to high intensity light on A. religiosa seedlings. The DNA from 15 resistant and 15 susceptible seedlings to high intensity light were isolated. Two bulked samples were formed and 35 primers were evaluated. From primers with PCR products, a second PCR reaction with DNA from individual seedlings was done. Registered data were: seedling survival to high intensity light, leaf number, stomata aperture, stomata number, and plant height. Correlations between these variables, and RAPDs profiles for each primer were computed. Bands which correlated with all variables were detected. 24 % of the seedlings survived to high intensity light. Stomata width and aperture showed the largest number of correlations. The 1801.92 pb band from primer 5'&#45;CCGGCCTTCC&#45;3' was correlated with almost all variables. This suggests that survival, height, leaf number, and stomata aperture are genetically controlled variables. Seedling survival to high intensity light is mainly determined by stomata aperture.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> <i>Abies religiosa</i> (Kunth) Schltdl. et Cham., stomata aperture, stomata, molecular marker, umbraphyla plant, assisted selection.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></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 innovaciones tecnol&oacute;gicas en gen&eacute;tica han tenido una aplicaci&oacute;n marginal y retardada en las especies forestales. Sus ciclos de vida largo, su gran tama&ntilde;o y sus relaciones ecol&oacute;gicas pueden ser causa de ese retraso. Adem&aacute;s, la naturaleza de los &aacute;rboles y bosques con su gama de productos y servicios conllevan mayor n&uacute;mero de desaf&iacute;os y oportunidades (Harry y Strauss, 2010). Por otro lado, en M&eacute;xico, la falta de distinci&oacute;n entre bosque natural y plantaci&oacute;n en las pol&iacute;ticas gubernamentales ha generado confusi&oacute;n en la opini&oacute;n p&uacute;blica. Si bien, hace falta reconocer la vocaci&oacute;n evolutiva del bosque, como proveedor de diversidad gen&eacute;tica; tambi&eacute;n es necesario aceptar la importancia de las plantaciones en la generaci&oacute;n de recursos y riqueza. Sin embargo, la poca promoci&oacute;n de las plantaciones forestales, en el territorio nacional, ha favorecido que el pa&iacute;s se convierta en importador de madera.</font></p>  	    <p align="justify"><font face="verdana" size="2">La biotecnolog&iacute;a forestal surgi&oacute; durante la d&eacute;cada de 1980, y comprende una colecci&oacute;n de herramientas auxiliares para la modificaci&oacute;n de la fisiolog&iacute;a y gen&eacute;tica del &aacute;rbol en el proceso de su mejoramiento, la propagaci&oacute;n e investigaci&oacute;n (Burdon y Libby, 2006). En M&eacute;xico, durante esa misma d&eacute;cada, ya se hab&iacute;an realizado un par de trabajos de cultivo <i>in vitro</i> de especies forestales (Mart&iacute;nez y Ochoa, 2010). La biotecnolog&iacute;a incluye al cultivo de tejidos, la micropropagaci&oacute;n, la ingenier&iacute;a gen&eacute;tica y los marcadores moleculares (Harry y Strauss, 2010). En los &uacute;ltimos 20 a&ntilde;os las tecnolog&iacute;as han aumentado y se han sofisticado, pero permanecen como un gran concepto: la biotecnolog&iacute;a de especies forestales (FAO, 2004).</font></p>  	    <p align="justify"><font face="verdana" size="2">De todos los m&eacute;todos biotecnol&oacute;gicos, la ingenier&iacute;a gen&eacute;tica ha recibido la mayor atenci&oacute;n y escrutinio por los responsables de la normatividad y la opini&oacute;n p&uacute;blica. Al menos, parte de esto se debe a la naturaleza de la tecnolog&iacute;a por si sola: genes artificialmente recombinantes de diferentes organismos y evasi&oacute;n de barreras naturales para la reproducci&oacute;n sexual. El movimiento de genes con t&eacute;cnicas convencionales de mejoramiento gen&eacute;tico es limitado para los taxa sexualmente compatibles, generalmente, especies emparentadas. Entonces, los genes que codifican nuevas rutas bioqu&iacute;micas (localizadas en otras especies) no se transfieren a las forestales de inter&eacute;s econ&oacute;mico (Harry y Strauss, 2010).</font></p>  	    <p align="justify"><font face="verdana" size="2">Las plantaciones forestales comerciales de transg&eacute;nicos se mantienen en el anonimato. El primer &aacute;rbol de ese tipo lo generaron Fillatti <i>et al.</i> (1987). Actualmente, se han utilizado docenas de especies forestales para prop&oacute;sitos de investigaci&oacute;n, pero no hay referencias sobre su uso para fines comerciales en Estados Unidos de Am&eacute;rica (Harry y Strauss, 2010). En Francia y otros pa&iacute;ses, los ejemplares transg&eacute;nicos se han quemado; China es la &uacute;nica naci&oacute;n que cuenta con superficies forestales comerciales, pero no se tiene su ubicaci&oacute;n exacta, para evitar el sabotaje (R&iacute;os, 2010). En M&eacute;xico y sus naciones vecinas tampoco se han utilizado dichos organismos. Por lo tanto, se carece de informaci&oacute;n sobre el flujo gen&eacute;tico hacia el territorio nacional.</font></p>  	    <p align="justify"><font face="verdana" size="2">El mejoramiento gen&eacute;tico forestal tradicional y la biotecnolog&iacute;a comparten objetivos, principios, pr&aacute;cticas y riesgos. Aun cuando, los dos m&eacute;todos representan diferentes enfoques, ambos se complementan. Genetistas forestales est&aacute;n trabajando con estos dos enfoques para mejorar la salud y la adaptaci&oacute;n de poblaciones o para incrementar la producci&oacute;n de bienes y servicios (Harry y Strauss, 2010). El flujo gen&eacute;tico desde las plantaciones comerciales a las poblaciones naturales se presenta, independientemente de la tecnolog&iacute;a utilizada, hacia la generaci&oacute;n de los cultivares mejorados (Schouten et al., 2006). Este cruzamiento ocurre entre individuos de la misma especie, o bien taxa cercanos evolutivamente. Cualquier plantaci&oacute;n forestal puede alterar la din&aacute;mica ecol&oacute;gica de un bosque natural, incluso los individuos nativos se pueden convertir en maleza, cuando no se toman las precauciones debidas. Tambi&eacute;n comparten la alta persistencia en campo.</font></p>  	    <p align="justify"><font face="verdana" size="2">Las especies forestales son las principales beneficiadas de la biotecnolog&iacute;a: por su ciclo de vida tan largo, gran tama&ntilde;o, y presencia en ambientes heterog&eacute;neos. Los m&eacute;todos biotecnol&oacute;gicos ayudan a reducir costos, tiempo, o bien, a incluir nuevos objetivos en los estudios gen&eacute;ticos (Harry y Strauss, 2010). Con las t&eacute;cnicas tradicionales, generalmente, se eleg&iacute;a una variable por cada ciclo de selecci&oacute;n. En la actualidad, los marcadores moleculares se est&aacute;n empezando a integrar a los programas de mejoramiento gen&eacute;tico para obtener mayor diversidad, incrementar la ganancia gen&eacute;tica generacional y reducir los costos de selecci&oacute;n (Harry y Strauss, 2010).</font></p>  	    <p align="justify"><font face="verdana" size="2">La velocidad con la cual se determinan nuevas especies se ha incrementado, gracias a los avances t&eacute;cnicos en las herramientas gen&oacute;micas, que incluyen la secuenciaci&oacute;n de genomas (Tuskan <i>et al.,</i> 2006; Grattapaglia <i>et al.,</i> 2009). Una caracter&iacute;stica clave de la ingenier&iacute;a gen&eacute;tica es que la inserci&oacute;n asexual involucra de uno a doce genes; mientras que el mejoramiento gen&eacute;tico tradicional, a decenas de miles de genes aleatoriamente combinados (Harry y Strauss, 2010).</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>Abies religiosa</i> (Kunth) Schltdl. <i>et</i> Cham. es una especie dominante en bosques de gran altitud en el centro de M&eacute;xico (Rzedowski, 2006). Sin embargo, su uso es marginal (G&oacute;mez, 2003), pese a su gran potencial como &aacute;rbol urbano (Chacalo <i>et al.,</i> 1994), &aacute;rbol de Navidad (&Aacute;lvarez&#45;Moctezuma <i>et al.,</i> 2007), bonsai, para la obtenci&oacute;n de madera y celulosa, construcci&oacute;n de techos, como medicina (Bojorges, 1990) y para el secuestro de carbono (Valenzuela, 2001).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El establecimiento de plantaciones con <i>A. religiosa</i> sin cobertura se dificulta, pese a ser tolerante a la sombra, sus brinzales son muy susceptibles a la intensidad luminosa alta, por lo que en espacios abiertos exhiben una gran mortandad (Camacho, 1996). Los brinzales requieren de 0.6 a 0.74 m<sup>2</sup> de cobertura, es decir, 16.3 <b>&#956;</b>mol&#183;m<sup>&#45;2</sup> s<sup>&#45;1</sup> de intensidad lum&iacute;nica (May, 2001). Como consecuencia, la regeneraci&oacute;n natural en espacios abiertos se establece en cantidades reducidas, lo cual incide en la renovaci&oacute;n y restauraci&oacute;n de los bosques (Galindo, 1996).</font></p>  	    <p align="justify"><font face="verdana" size="2"><i>A. religiosa</i> exhibe variaci&oacute;n intraespec&iacute;fica e interespec&iacute;fica para la tolerancia a la exposici&oacute;n a intensidades lum&iacute;nicas altas (Camacho, 1996; Galindo, 1996; Gonz&aacute;lez, 1985; Pandey, 2006, Rodr&iacute;guez&#45;Calcerrada <i>et al.,</i> 2006). Por consiguiente, debe haber una gran probabilidad de dilucidar una base gen&eacute;tica que respalde la variaci&oacute;n intraespec&iacute;fica.</font></p>  	    <p align="justify"><font face="verdana" size="2">El An&aacute;lisis Segregante en Agrupaciones es el m&eacute;todo m&aacute;s com&uacute;n para la selecci&oacute;n asistida por marcadores moleculares, y requiere la evaluaci&oacute;n de tres generaciones. En muchas especies forestales no es posible aplicarlo por falta de l&iacute;neas endog&aacute;micas, su ciclo de vida largo y alta depresi&oacute;n endog&aacute;mica (Carlson <i>et al.,</i> 1994).</font></p>  	    <p align="justify"><font face="verdana" size="2">En el An&aacute;lisis Parental en Agrupaciones es factible utilizar &uacute;nicamente al progenitor femenino y su progenie, siempre que el marcador est&eacute; en condici&oacute;n heterocigota (Arcade <i>et al.,</i> 2002; Carlson <i>et al.,</i> 1994; Marques <i>et al.,</i> 1999).</font></p>  	    <p align="justify"><font face="verdana" size="2">Actualmente es una realidad la utilizaci&oacute;n de los marcadores moleculares en especies forestales para la selecci&oacute;n de caracter&iacute;sticas con importancia econ&oacute;mica (Carlson et al., 1994). As&iacute;, se han localizado regiones gen&oacute;micas que controlan los par&aacute;metros microdensitom&eacute;tricos correspondientes a las caracter&iacute;sticas de la madera en h&iacute;bridos del g&eacute;nero Larix (Arcade et al., 2002). Tambi&eacute;n, se ha realizado selecci&oacute;n con marcadores asistidos en programas de mejoramiento gen&eacute;tico de retrocruzas, para resistencia al cancro en Castanea dentata (Marsh.) Borkh. (Bernatzky y Mulcahy, 1992).</font></p>  	    <p align="justify"><font face="verdana" size="2">En especies e h&iacute;bridos de <i>Eucalyptus</i> se ha hecho selecci&oacute;n retrospectiva de &aacute;rboles &eacute;lite, mediante pruebas de paternidad con marcadores de microsat&eacute;lite como una buena alternativa para el mejoramiento gen&eacute;tico t&aacute;ctico a corto plazo (Grattapaglia <i>et al.,</i> 2004).</font></p>  	    <p align="justify"><font face="verdana" size="2">Adem&aacute;s se han determinado QTLs <i>(Quantitative Traits Loci),</i> a nivel de transcripci&oacute;n, para la identificaci&oacute;n de genes candidatos para los caracteres cuantitativos de calidad y crecimiento de madera (Kirst <i>et al.,</i> 2004). Con la aplicaci&oacute;n de esta t&eacute;cnica se han detectado caracteres de importancia econ&oacute;mica en <i>Pinus sylvestris</i> L. (Lerceteau <i>et al.,</i> 1999); y en Picea spp. se identificaron marcadores de densidad de la madera (Markussen <i>et al.,</i> 1999); as&iacute; como, genes que controlan el crecimiento en <i>Eucalyptus nitens</i> (H. Deane <i>et.</i> Maiden) Maiden (Moran <i>et al.,</i> 1999) y los asociados a caracter&iacute;sticas de microdensitometr&iacute;a de la madera en Larix spp. (Prat <i>et al.,</i> 1999). Tambi&eacute;n se han localizado caracteres fisiol&oacute;gicos ligados a marcadores moleculares para el crecimiento foliar en <i>Populus</i> (Taylor <i>et al.,</i> 1999). En el caso de <i>Eucalyptus tereticornis</i> Sm. y <i>Eucalyptus globulus</i> Labill., se han determinado los genes que regulan caracteres de la propagaci&oacute;n vegetativa (Marques <i>et al.</i>, 1999).</font></p>  	    <p align="justify"><font face="verdana" size="2">La t&eacute;cnica RAPD (<i>Random Amplified Polymorphic DNA</i>) se ha utilizado para detectar los marcadores moleculares ligados a genes que regulan la resistencia a la roya vesicular de los pinos blancos en <i>Pinus lambertiana</i> Douglas (Devey <i>et al.,</i> 1995); los asociados con la resistencia a la agalla de la ac&iacute;cula de pino en <i>Pinus thunbergii</i> Parl. Kondo <i>et al.,</i> 1999); aqu&eacute;llos relacionados con la resistencia a <i>Anisogramma anomola</i> (Peck) E. M&uuml;ller en <i>Corylus avellana</i> L. (Mechlenbacher <i>et al.,</i> 2004) y a <i>Alternaria alternata</i> (Fries) Keissler en <i>Populus</i> (Su <i>et al.,</i> 2000); y se han mapeado especies e h&iacute;bridos de <i>Populus</i> (Storme <i>et al.,</i> 1999). Los perfiles de RAPDs son &uacute;tiles en la selecci&oacute;n asistida por marcadores moleculares, en el mapeo cromos&oacute;mico y en la transg&eacute;nesis.</font></p>  	    <p align="justify"><font face="verdana" size="2">A trav&eacute;s de un An&aacute;lisis Segregante en Agrupaciones (<i>Bulked Segregant Analysis</i>) se han detectado marcadores moleculares ligados a la resistencia a Melampsora medusae Th&uuml;m., en Populus deltoides Bartram ex Marshall (Tabor et al., 2000). As&iacute; mismo, la selecci&oacute;n asistida con marcadores moleculares ha permitido mejorar la respuesta en crecimiento bajo condiciones de estr&eacute;s abi&oacute;tico (Tauer <i>et al.,</i> 1992).</font></p>  	    <p align="justify"><font face="verdana" size="2">El objetivo de este estudio fue detectar los perfiles de RAPD asociados con la resistencia a intensidad luminosa alta en brinzales de <i>Abies religiosa,</i> para utilizarlos en procesos de selecci&oacute;n asistida en el futuro.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></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">En 2005, se recolectaron semillas de medios hermanos maternos de <i>Abies religiosa</i> en la ladera sur del Parque Nacional Cumbres del Ajusco (Tlalpan, D. F.), ubicada a 19&#176; 12' de latitud norte y 99&#176; 15' de longitud oeste. Las semillas germinaron bajo malla&#45;sombra de 90 % (hasta 1000 &#956;mol m<sup>2</sup> s<sup>&#45;1</sup>).</font></p>  	    <p align="justify"><font face="verdana" size="2">A finales del primer trimestre del siguiente a&ntilde;o, se colocaron 400 brinzales (hermanos maternos) de un a&ntilde;o de edad cubiertos con malla&#45;sombra de 90 %, la cual se reemplaz&oacute; a las dos semanas por malla&#45;sombra de 60 % (hasta 4000 <b>&#956;</b>mol m<sup>2</sup> s<sup>&#45;1</sup>) en el vivero de la Divisi&oacute;n de Ciencias Forestales, Universidad Aut&oacute;noma Chapingo. Los brinzales cuyo vigor disminuy&oacute; se retiraron y se dispusieron bajo malla&#45;sombra de 90 %, etiquet&aacute;ndolos como muy sensibles a intensidad luminosa alta.</font></p>  	    <p align="justify"><font face="verdana" size="2">Dos semanas despu&eacute;s, se sustituy&oacute; por malla&#45;sombra de 40 % (hasta 6,000 <b>&#956;</b>mol m<sup>2</sup> s<sup>&#45;1</sup>) y los brinzales que exhibieron menor vigor se pusieron bajo malla&#45;sombra de 90 %, rotul&aacute;ndolos como sensibles. A las dos semanas los individuos supervivientes se marcaron como resistentes.</font></p>  	    <p align="justify"><font face="verdana" size="2">A las dos semanas, se eligieron al azar 15 ejemplares resistentes y 15 muy susceptibles a intensidad luminosa alta; de cada uno se tom&oacute; 0.1 g de ac&iacute;culas j&oacute;venes, de buen vigor y libres de plagas, hongos y da&ntilde;os f&iacute;sicos. Se lavaron con extrano y etanol al 70 %; a continuaci&oacute;n se extrajo el ADN con el protocolo <i>Nucleon Phytopure Plant DNA Extraction<sup>&#174;</sup></i> (Amersham Biosciences, 2008), durante la lisis de la pared celular se agreg&oacute; <b>&#946;</b>&#45;mercaptoetanol; se adicion&oacute; RNAasa A; y se estandariz&oacute; la concentraci&oacute;n de ADN por individuo a 10 pmol.</font></p>  	    <p align="justify"><font face="verdana" size="2">Se hicieron dos muestras compuestas: la primera con vol&uacute;menes id&eacute;nticos de ADN (10 pM) de cada uno de los 15 brinzales resistentes; la otra correspondi&oacute; al ADN de los 15 brinzales susceptibles. La reacci&oacute;n de PCR se realiz&oacute; en un termociclador Techne<sup>&#174;</sup>, con un ciclo a 91&#176; C (2 min); 35 ciclos de 30 segundos a 94&#176; C, 30 segundos a 40&#176; C y 90 segundos a 72&#176; C y un ciclo a 72&#186; C (90 minutos). Cada microtubo conten&iacute;a 81.07 <b>&#956;</b>L de agua deionizada (Sigma), 10 <b>&#956;</b>L amortiguador de Mg (1 M), 3 <b>&#956;</b>L de MgCl<sub>2</sub> (50 mM), 2 <b>&#956;</b>L de dNTPs (10 mM), 2.5 <b>&#956;</b>L iniciador, 0.93 <b>&#956;</b>L ADN, 0.5 <b>&#956;</b>L de Taq DNA&#45;polimerasa (Invitrogen<sup>&#174;</sup>). Se evaluaron 35 iniciadores (Operon<sup>&#174;</sup>) con 80 % de citocinas y guaninas: la mayor&iacute;a con dos citocinas o guaninas en ambos extremos.</font></p>  	    <p align="justify"><font face="verdana" size="2">La electrofor&eacute;sis se llev&oacute; a cabo en un gel de UltraPure&#8482; Agarosa&#45;1000&#174; (Invitrogen) al 8 % (p/v). Las muestras individuales inclu&iacute;an 7<b>&#956;</b>L de ADN y 5<b>&#956;</b>L de amortiguador de carga. El marcador de peso molecular fue de 100 bp DNA Ladder<sup>&#174;</sup> (Invitrogen<sup>&#174;</sup>). Se ti&ntilde;&oacute; con bromuro de etidio (Sigma) y visualiz&oacute; en un Sistema de An&aacute;lisis e Interpretaci&oacute;n de Geles Edas 290<sup>&#174;</sup> (Kodak).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los iniciadores que presentaron productos de PCR se usaron para una nueva reacci&oacute;n de PCR con el ADN de cada brinzal (15 susceptibles y 15 resistentes). Para el corrimiento y revelado de los geles se sigui&oacute; el procedimiento antes descrito.</font></p>  	    <p align="justify"><font face="verdana" size="2">Las variables consideradas fueron la supervivencia a la intensidad luminosa alta (ausencia o presencia); n&uacute;mero de ac&iacute;culas por brinzal; altura de planta (cm); promedio de la apertura estomatal (<b>&#181;</b>m); y promedio del n&uacute;mero de estomas por brinzal.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Para obtener los promedio de la apertura estomatal y del n&uacute;mero de estomas por individuos se muestrearon cinco hojas por brinzal localizadas a diferente altura; se fijaron con FAA (Ruzin, 1999) (durante 24 horas); se transparentaron con blanqueador dom&eacute;stico Cloralex<sup>&#174;</sup> (por 72 horas); y se lavaron dos veces con agua destilada.</font></p>  	    <p align="justify"><font face="verdana" size="2">La epidermis del env&eacute;s se aisl&oacute; manualmente, con pinzas de disecci&oacute;n y bajo un microscopio estereosc&oacute;pico Leica Zoom 2000<sup>&#174;</sup>; se ti&ntilde;&oacute; durante cinco minutos con acetocarm&iacute;n (Ruzin, 1999) y se lav&oacute; dos veces con agua destilada. Las observaciones se hicieron en un microscopio de campo claro Leica Cme<sup>&#174;</sup> y se obtuvieron fotograf&iacute;as con una c&aacute;mara Motic<sup>&#174;</sup>. El n&uacute;mero de estomas por muestra (en 0.040 mm<sup>2</sup>) se contabiliz&oacute; en cinco campos, con un aumento de 400x.</font></p>  	    <p align="justify"><font face="verdana" size="2">La apertura estomatal se midi&oacute; en 10 c&eacute;lulas por brinzal (con un aumento total de 1000x); adem&aacute;s, se calcul&oacute; el n&uacute;mero de estomas por hoja y planta; y el &aacute;rea del ost&iacute;olo por estoma y planta.</font></p>  	    <p align="justify"><font face="verdana" size="2">El an&aacute;lisis estad&iacute;stico se hizo mediante correlaciones producto&#45;momento de Pearson con Excel<sup>&#174;</sup> (Microsoft Office) entre las caracter&iacute;sticas morfol&oacute;gicas y los perfiles de bandas de cada iniciador; as&iacute; como para las variables morfol&oacute;gicas. Se analizaron las asociaciones significativas (P=0.01) y sin relaciones de c&aacute;lculo.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></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">Supervivencia de brinzales</font></p>  	    <p align="justify"><font face="verdana" size="2">Se registraron 95 brinzales de 400 (23.75 %) que sobrevivieron a la intensidad luminosa alta. Al respecto, otros autores consignan porcentajes menores (10&#45;15 %) (Camacho, 1996; Galindo, 1996).</font></p>  	    <p align="justify"><font face="verdana" size="2">Es importante se&ntilde;alar que la semilla fue recolectada de poblaciones ubicadas en sitios del Ajusco con exposici&oacute;n sur; por lo que es factible suponer, que al estar expuestas a mayores intensidades luminosas pudiesen haber sido preseleccionadas de manera natural para la supervivencia en condiciones de alta intensidad luminosa. En general, se reconoce que la luz es un factor primordial para el establecimiento exitoso de las especies forestales (Koike, 2001).</font></p>  	    <p align="justify"><font face="verdana" size="2">Davies (2001) determin&oacute; para 11 taxa arb&oacute;reos simp&aacute;tricos, en Borneo, que las tasas de mortalidad var&iacute;an entre las especies. La mortalidad estuvo significativamente relacionada al tama&ntilde;o del &aacute;rbol, en la mayor&iacute;a de ellas.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La supervivencia es una variable compleja, producto de la acci&oacute;n e interacci&oacute;n de muchas otras variables aisladas; por ejemplo, del tama&ntilde;o de la semilla, la disponibilidad de nitr&oacute;geno y la tasa de crecimiento bajo sombra profunda (Walters y Reich, 2000). Un elemento muy importante que incide en ella es la competencia entre ra&iacute;ces (Coomes y Grubb, 2000).</font></p>  	    <p align="justify"><font face="verdana" size="2">En especies arb&oacute;reas y arbustivas de zonas templadas ubicadas en Am&eacute;rica, Europa y Asia se han documentado correlaciones negativas entre la tolerancia a la sombra y la sequ&iacute;a; as&iacute; como entre la primera y la correspondiente a la inundaci&oacute;n (Niinemets, 2006). Si se considera que los taxa no susceptibles a la sombra tienen plasticidad fisiol&oacute;gica y morfol&oacute;gica (Kubiske y Abrams, 1994), es probable que esto les haya conferido una preadaptaci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">Los iniciadores evaluados fueron 35, de ellos, solo nueve resultaron polim&oacute;rficos y mostraron marcadas diferencias entre productos de amplificaci&oacute;n, por el m&eacute;todo de RAPD (5'&#45;GCATCCCGGC&#45;3', 5'&#45;GCCGGGATGC&#45;3', 5'&#45;CCGCCGTTGG&#45;3', 5'&#45;CCCCGCAACG&#45;3', 5'&#45;CGGCGGTAGG&#45;3, 5'&#45;GCCGCCATCC&#45;3', 5'&#45;CCGGCCTTCC&#45;3', 5'&#45;CCCGCCTTCC&#45;3' y 5'&#45;ATGTGTTGCG&#45;3').</font></p>  	    <p align="justify"><font face="verdana" size="2">Al final del primer an&aacute;lisis se obtuvieron nueve iniciadores polim&oacute;rficos, cuatro monom&oacute;rficos y 15 sin resultados significativos. Se probaron seis iniciadores de los nueve polim&oacute;rficos en cada uno de los individuos resistentes y susceptibles, y de ellos solamente el iniciador 5'&#45;CCCCGCAACG&#45;3' no gener&oacute; productos de amplificaci&oacute;n. El que tuvo m&aacute;s productos de amplificaci&oacute;n fue 5'&#45;GCCGGGATGC&#45;3' (con 12 bandas) (<a href="/img/revistas/remcf/v3n12/a7c1.jpg" target="_blank">Cuadro 1</a>, <a href="/img/revistas/remcf/v3n12/a7f1.jpg" target="_blank">Figura 1</a>).</font>	</p>     <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2">Correlaci&oacute;n de productos de amplificaci&oacute;n y supervivencia</font></p>  	    <p align="justify"><font face="verdana" size="2">En cinco productos de amplificaci&oacute;n (provenientes de tres iniciadores) se determin&oacute; la correlaci&oacute;n entre la supervivencia y la intensidad luminosa (<a href="/img/revistas/remcf/v3n12/a7c1.jpg" target="_blank">Cuadro 1</a>). En la literatura hay registros sobre el control gen&eacute;tico de la tolerancia a la intensidad luminosa; por ejemplo, la s&iacute;ntesis del fosfatidilglicerol es regulada por un gen simple; este compuesto permite que las c&eacute;lulas se protejan en condiciones de alta luminosidad, mediante dimerizaci&oacute;n y reactivaci&oacute;n del Fotosistema II, lo que favorece el mantenimiento del proceso fotosint&eacute;tico (Sakurai <i>et al.,</i> 2003).</font></p>  	    <p align="justify"><font face="verdana" size="2">La bios&iacute;ntesis del tetrapirrol est&aacute; estrictamente regulada para prevenir la acumulaci&oacute;n de intermediarios libres, y responde al control de ciertos genes (Sperling <i>et al.,</i> 1997). Adem&aacute;s, la enzima oxidorreductasa de la protoclorofila protege a las pl&aacute;ntulas del da&ntilde;o fotodin&aacute;mico (Su <i>et al.,</i> 2001). Por &uacute;ltimo, la fase c&uacute;bica del PBL paracristalino ha sido propuesta como un amortiguador contra el da&ntilde;o foto&#45;oxidativo, en condiciones de altas intensidades de luz (Franck <i>et al.,</i> 2000). Por lo tanto, la supervivencia a la intensidad luminosa alta puede explicarse por muchos factores, algunos de ellos controlados gen&eacute;ticamente.</font></p>  	    <p align="justify"><font face="verdana" size="2">La altura es una variable importante, porque con ella es posible inferir la edad del &aacute;rbol, y <i>Abies religiosa</i> pierde susceptibilidad a la intensidad luminosa con la edad.</font></p>  	    <p align="justify"><font face="verdana" size="2">El promedio de altura de los brinzales susceptibles fue de 34.3 cm, mientras que en los resistentes fue de 33.5 cm; sin embargo, no hubo diferencias significativas (P=0.05) entre ambos, lo cual pudo responder a que el intervalo de altura fue muy estrecho (18 a 40 cm). Es posible que si se ampl&iacute;a, se tengan resultados diferentes.</font>	</p> 	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La condici&oacute;n sombr&iacute;a es limitante para el crecimiento de los organismos aut&oacute;trofos. Al respecto, Olusegun <i>et al.</i> (1994) consignan que 12 especies forestales bajo condiciones de menor intensidad luminosa reducen su crecimiento en altura, en tanto que <i>Betula papyrifera</i> Marsh., <i>B. alleghaniensis</i> Britton, <i>Ostrya virginiana</i> (Mill.) K. Koch, <i>Acer saccharum</i> Marsh. y <i>Quercus rubra</i> L. presentan respuestas variables bajo condiciones de sombra, en funci&oacute;n de la especie (Walters <i>et al.,</i> 1996). Poorter <i>et al.</i> (2003) evaluaron 53 &aacute;rboles tropicales con diferente tolerancia a la sombra, y determinaron que la altura estaba fuertemente correlacionada con la arquitectura de la planta, pues aquellas que destinan muchos recursos a la formaci&oacute;n de tallos laterales tienden a ser de menor porte.</font></p>  	    <p align="justify"><font face="verdana" size="2">En general, se reconoce que la sombra reduce el crecimiento en la mayor&iacute;a de las especies forestales. As&iacute;, Pag&egrave;s <i>et al.</i> (2003) observaron que los efectos directos del sombreado son negativos para todas los taxa no tolerantes, pero la afectaci&oacute;n en <i>Picea abies</i> (L.) Karst. y <i>Abies alba</i> Mill. fue superior que en <i>Fagus sylvatica</i> L. y <i>Acer pseudoplatanus</i> L.</font></p>  	    <p align="justify"><font face="verdana" size="2">Existen otros factores importantes en el crecimiento de un brinzal bajo el dosel; por ejemplo, la nutrici&oacute;n. Catovsky y Bazzaz (2002) documentan que la disponibilidad de nitr&oacute;geno influye en la regeneraci&oacute;n de especies arb&oacute;reas de clima templado a partir del banco de semillas del sotobosque. Kobe (2006) reconoce que el crecimiento de un brinzal es funci&oacute;n de la luz, de la disponibilidad de agua en el suelo y del nitr&oacute;geno foliar.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Correlaci&oacute;n de los productos de amplificaci&oacute;n y la altura</font></p>  	    <p align="justify"><font face="verdana" size="2">Se obtuvieron cuatro bandas que correlacionaron significativamente (P=0.01) con la altura del brinzal (<a href="/img/revistas/remcf/v3n12/a7c1.jpg" target="_blank">Cuadro 1</a>). Esto coincide con lo citado en diversas investigaciones referentes a la heredabilidad de la altura en especies forestales (Clark <i>et al.,</i> 1998; Jindal, 1998; L&oacute;pez <i>et al.,</i> 1999; Mohammad <i>et al.,</i> 2005; Palmer, 2006; St. Clair, 2000). As&iacute;, al menos 11 loci se asocian con dicha variable en <i>Glycine max</i> (L.) Merr. (Lee <i>et al.,</i> 1996); a diferencia de lo registrado para <i>Arabidopsis thaliana</i> (L.) Heynh., planta en la cual la altura y la floraci&oacute;n son controladas por un solo gen de dominancia parcial (Kearsey <i>et al.,</i> 2003).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">N&uacute;mero de hojas</font></p>  	    <p align="justify"><font face="verdana" size="2">Se detectaron siete productos de amplificaci&oacute;n, provenientes de tres iniciadores que correlacionaron de manera significativa con el n&uacute;mero de hojas por individuo (<a href="/img/revistas/remcf/v3n12/a7c1.jpg" target="_blank">Cuadro 1</a>). Se esperar&iacute;a que los brinzales resistentes tuvieran menor cantidad de hojas, ya que esto reducir&iacute;a la evapotranspiraci&oacute;n. Sin embargo, en los brinzales susceptibles se contabilizaron menos hojas (666 hojas por planta), que en los brinzales resistentes (1,110 hojas por planta). Lo anterior sugiere que en los brinzales resistentes el cierre de sus estomas fue eficaz.</font></p>  	    <p align="justify"><font face="verdana" size="2">En <i>Gossypium hirsutum</i> L., el loci JESPR&#45;178 revel&oacute; la asociaci&oacute;n m&aacute;s alta con el deshoje natural (Abdurakhmonov <i>et al.,</i> 2005). En <i>Arabidopsis thaliana,</i> se han identificado genes que regulan la expresi&oacute;n del meristemo adaxial (Grigg <i>et al.,</i> 2005); y en <i>Pinus sylvestris,</i> al menos 42 genes participan en la morfog&eacute;nesis de las ac&iacute;culas (Zelena y Sorochyns'kyi, 2005).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En un estudio realizado con dos especies herb&aacute;ceas alpinas, <i>Podophyllum hexandrum</i> Royle (tolerante a sombra) y <i>Rheum emodi</i> Wall. (demandante de luz), se concluy&oacute; que la diferencia en aclimataci&oacute;n a baja intensidad luminosa responde a los cambios en la morfolog&iacute;a y anatom&iacute;a foliares (Pandey, 2006).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Apertura estomatal</font></p>  	    <p align="justify"><font face="verdana" size="2">En todos los individuos resistentes se observaron los estomas cerrados y en los susceptibles estuvieron abiertos (<a href="#f2">Figura 2</a>). La apertura estomatal est&aacute; controlada por factores gen&eacute;ticos, adem&aacute;s de los agentes ambientales. En <i>Gossypium hirsutum</i> y <i>G. barbadense</i> L., se identificaron rasgos cuantitativos de los loci (QTL) que inciden en la conductancia estomatal (Ulloa et al., 2000).</font></p> 	    <p align="center"><a name="f2"></a></p> 	    <p align="center"><img src="/img/revistas/remcf/v3n12/a7f2.jpg" alt=""/></p>  	    <p align="justify"><font face="verdana" size="2">En <i>Arabidopsis thaliana</i> se documentan genes que codifican los factores de transcripci&oacute;n implicados en el cierre de estomas (Gray, 2005; Liang <i>et al.,</i> 2005); as&iacute; mismo se ha demostrado que las fototropinas PHOT1 y PHOT2 son los receptores de luz azul en los estomas y regulan la apertura estomatal (Kinoshita <i>et al.,</i> 2001). Olusegun <i>et al.</i> (1994) consignan respuestas estomatales diferenciales entre 12 especies forestales sometidas a menor intensidad luminosa.</font></p>  	    <p align="justify"><font face="verdana" size="2">Los efectos de disponibilidad de agua y luz en la asimilaci&oacute;n de carbono difieren considerablemente entre las especies tolerantes e intolerantes a la sombra. Las primeras tienen plasticidad fisiol&oacute;gica y morfol&oacute;gica para facilitar la captura de luz y la asimilaci&oacute;n de carbono, bajo condiciones sombr&iacute;as (Kubiske y Abrams, 1994). Adem&aacute;s, en t&eacute;rminos generales, la ausencia de cierre estomatal les permite una mejor adaptaci&oacute;n a las condiciones de luz reducida durante la sequ&iacute;a (Kubiske et al., 1996).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Supervivencia</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La supervivencia a intensidad luminosa alta present&oacute; el mayor n&uacute;mero de correlaciones con otras variables morfol&oacute;gicas. En la literatura se cita que la resistencia a la intensidad luminosa alta es una variable compleja que est&aacute; determinada por muchas de tipo morfol&oacute;gico, fisiol&oacute;gico y fenol&oacute;gico (Prasad, 1997). No obstante, las que tuvieron una correlaci&oacute;n m&aacute;s grande (negativa) con la supervivencia fueron las relacionadas con el ancho y el &aacute;rea del ost&iacute;olo. En las pl&aacute;ntulas de <i>Abies religiosa</i> se debe considerar a la apertura estomatal como un factor determinante para su supervivencia en condiciones de intensidad luminosa alta (<a href="/img/revistas/remcf/v3n12/a7c2.jpg" target="_blank">Cuadro 2</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2">La situaci&oacute;n umbr&iacute;a es limitante para la fotos&iacute;ntesis. Por ejemplo, Kobe <i>et al.</i> (1995) evaluaron en campo la supervivencia de brinzales de 10 especies dominantes del g&eacute;nero <i>Quercus,</i> y determinaron que dicha persistencia est&aacute; fuertemente correlacionada con la tolerancia a la sombra. Mientras que, Walters <i>et al.</i> (1996) en condiciones de campo y bajo sombra consignan que para <i>Betula papyrifera, B. alleghaniensis, Ostrya virginiana, Acer saccharum</i> y <i>Quercus rubra</i> es funci&oacute;n de la especie.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>CONCLUSIONES</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se observaron 25 % de brinzales de <i>Abies religiosa</i> resistentes a la intensidad luminosa alta.</font></p>  	    <p align="justify"><font face="verdana" size="2">La evaluaci&oacute;n de las variables supervivencia, altura de los individuos, n&uacute;mero de hojas en brinzales y apertura estomatal sugieren que son caracter&iacute;sticas morfol&oacute;gicas que est&aacute;n controladas gen&eacute;ticamente.</font></p>  	    <p align="justify"><font face="verdana" size="2">Se descubrieron nueve iniciadores que revelaron bandas significativamente correlacionadas con las variables anteriores.</font></p>  	    <p align="justify"><font face="verdana" size="2">La supervivencia en condiciones de intensidad luminosa alta est&aacute; determinada, principalmente, por la apertura estomatal.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>AGRADECIMIENTOS</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los autores agradecen a la Comisi&oacute;n Nacional Forestal y al Consejo Nacional de Ciencia y Tecnolog&iacute;a por el financiamiento otorgado a trav&eacute;s del proyecto "Tecnolog&iacute;as para la restauraci&oacute;n de los bosques en declinaci&oacute;n del Distrito Federal" (CONAFOR&#45;2002&#45;C01&#45;6181).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>REFERENCIAS</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">Abdurakhmonov, I. Y., A. A. Abdullaev, S. Saha. Z. T. Buriev, D. Arslanov, Z. Kuryazov, G. T. Mavlonov, S. M. Rizaeva, U. K. Reddy, J. N. Jenkins, A. Abdullaev and A. Abdukarimov. 2005. Simple sequence repeat marker associated with a natural leaf defoliation trait in tetraploid cotton. J. 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<source><![CDATA[Ukr. Biokhim Zh.]]></source>
<year>2005</year>
<volume>77</volume>
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