<?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>0378-1844</journal-id>
<journal-title><![CDATA[Interciencia]]></journal-title>
<abbrev-journal-title><![CDATA[INCI]]></abbrev-journal-title>
<issn>0378-1844</issn>
<publisher>
<publisher-name><![CDATA[ASOCIACIÓN INTERCIENCIA]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0378-18442006000200004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[La biotecnología en plantas y aspectos biotecnológicos del mango]]></article-title>
<article-title xml:lang="en"><![CDATA[PLANT BIOTECHNOLOGY AND BIOTECHNOLOGICAL ASPECTS OF MANGO]]></article-title>
<article-title xml:lang="pt"><![CDATA[A BIOTECNOLOGIA EM PLANTAS E ASPECTOS BIOTECNOLÓGICOS DA MANGA]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Domínguez]]></surname>
<given-names><![CDATA[Marisela]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Marisela Rivera-Domínguez. Químico Biólogo, Universidad de Sonora, México. Maestría en Nutrición y Alimentos, Centro de Investigación y Desarrollo, A.C. (CIAD), México. ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2006</year>
</pub-date>
<volume>31</volume>
<numero>2</numero>
<fpage>95</fpage>
<lpage>100</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0378-18442006000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0378-18442006000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0378-18442006000200004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El presente trabajo analiza aspectos biotecnológicos generales para el mejoramiento de características agronómicas de plantas hortofrutícolas, utilizando la tecnología del ADN recombinante. Mediante la misma se ha logrado obtener plantas transgénicas resistentes a insectos, hongos, bacterias y herbicidas, con mejores características de calidad durante poscosecha y con alto contenido nutricional. Se ha dado un enfoque especial a los aspectos biotecnológicos para el mejoramiento del mango, dado que durante las pasadas dos décadas muy pocos cultivares han sido mejorados. En algunos ensayos, los principales aspectos estudiados son la eficiencia en la inducción de embriones durante la embriogénesis somática y en la recuperación de plantas, la inducción al azar de mutantes para obtener plantas resistentes a agentes selectivos y la transformación con genes que regulan ciertas características agronómicas. La biotecnología tiene un alto potencial para proveer soluciones alternativas a problemas que demandan no sólo los productores de mango, sino también para los demás productores agrícolas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[This paper gives an overview of general biotechnological procedures for the improvement of agronomical characteristics of plants using DNA recombinant technologies. Transgenic plants have been obtained which show resistance to insects, fungi, bacteria and herbicides, high nutritional value and improved quality traits during pre and post harvest. Special emphasis is placed on efforts to improve mango through biotechnology, given that very few improved mango cultivars have been released during the past two decades. Some assays involved studies on the induction of efficient embryo induction during somatic embryogenesis and on plant recovery, the random induction of mutants to obtain resistance to selective agents, and the transformation by genes that regulate given horticultural traits. Biotechnology has a high potential to provide alternative solutions to the problems claimed by mango producers as well as other horticultural producers.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[O presente trabalho analisa aspectos biotecnológicos gerais para o melhoramento das características agronômicas de plantas hortofrutigranjeiras, utilizando a tecnologia do ADN recombinante, mediante a qual, tem-se logrado como objetivo a obtenção de plantas resistentes à insetos, fungos, bactérias, herbicidas, com melhores características de qualidade durante a pre e pós-colheita e com alto conteúdo nutricional. Tem-se dado um foco especial aos aspectos biotecnológicos para o melhoramento da manga, uma vez que, durante as duas décadas passadas muito poucas cultivares têm sido melhoradas. Em alguns ensaios, os principais aspectos estudados são a eficiência na indução de embriões durante a embriogenese somática e na recuperação de plantas, a indução ao acaso de mutantes para obter plantas resistentes à agentes seletivos e a transformação com genes que regulam certas características agronômicas. A biotecnologia tem um alto potencial para prover soluções alternativas a problemas que demandam não só os produtores de manga, mas também para os demais produtores agrícolas]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Biotecnología de Plantas]]></kwd>
<kwd lng="es"><![CDATA[ADN Recombinante]]></kwd>
<kwd lng="es"><![CDATA[Mango]]></kwd>
<kwd lng="es"><![CDATA[Transformación Genética de Plantas]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="center"><b><font face="Verdana" size="3">LA BIOTECNOLOG&Iacute;A EN PLANTAS Y ASPECTOS BIOTECNOL&Oacute;GICOS DEL MANGO</font></b></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="center"><font face="Verdana" size="2">Marisela Rivera-Dom&iacute;nguez</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="center"><font face="Verdana" size="2">Marisela Rivera-Dom&iacute;nguez. Qu&iacute;mico Bi&oacute;logo, Universidad de Sonora, M&eacute;xico. Maestr&iacute;a en Nutrici&oacute;n y Alimentos, Centro de Investigaci&oacute;n y Desarrollo, A.C. (CIAD), M&eacute;xico. Doctorado en Ciencias en Biotecnolog&iacute;a de Plantas, CINVESTAV/IPN, M&eacute;xico. Investigador, CIAD, M&eacute;xico. Direcci&oacute;n: CIAD, A.P.1735, Hermosillo, Sonora, 83000 M&eacute;xico. e-mail: marisela@cascabel.ciad.mx</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"><b>Resumen</b></font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">El presente trabajo analiza aspectos biotecnol&oacute;gicos generales para el mejoramiento de caracter&iacute;sticas agron&oacute;micas de plantas hortofrut&iacute;colas, utilizando la tecnolog&iacute;a del ADN recombinante. Mediante la misma se ha logrado obtener plantas transg&eacute;nicas resistentes a insectos, hongos, bacterias y herbicidas, con mejores caracter&iacute;sticas de calidad durante poscosecha y con alto contenido nutricional. Se ha dado un enfoque especial a los aspectos biotecnol&oacute;gicos para el mejoramiento del mango, dado que durante las pasadas dos d&eacute;cadas muy pocos cultivares han sido mejorados. En algunos ensayos, los principales aspectos estudiados son la eficiencia en la inducci&oacute;n de embriones durante la embriog&eacute;nesis som&aacute;tica y en la recuperaci&oacute;n de plantas, la inducci&oacute;n al azar de mutantes para obtener plantas resistentes a agentes selectivos y la transformaci&oacute;n con genes que regulan ciertas caracter&iacute;sticas agron&oacute;micas. La biotecnolog&iacute;a tiene un alto potencial para proveer soluciones alternativas a problemas que demandan no s&oacute;lo los productores de mango, sino tambi&eacute;n para los dem&aacute;s productores agr&iacute;colas.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="center"><b><font face="Verdana" size="3">PLANT BIOTECHNOLOGY AND BIOTECHNOLOGICAL ASPECTS OF MANGO</font></b></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"><b>Summary</b></font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">This paper gives an overview of general biotechnological procedures for the improvement of agronomical characteristics of plants using DNA recombinant technologies. Transgenic plants have been obtained which show resistance to insects, fungi, bacteria and herbicides, high nutritional value and improved quality traits during pre and post harvest. Special emphasis is placed on efforts to improve mango through biotechnology, given that very few improved mango cultivars have been released during the past two decades. Some assays involved studies on the induction of efficient embryo induction during somatic embryogenesis and on plant recovery, the random induction of mutants to obtain resistance to selective agents, and the transformation by genes that regulate given horticultural traits. Biotechnology has a high potential to provide alternative solutions to the problems claimed by mango producers as well as other horticultural producers.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="center"><b><font face="Verdana" size="3">A BIOTECNOLOGIA EM PLANTAS E ASPECTOS BIOTECNOL&Oacute;GICOS DA MANGA</font></b></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"><b>Resumo</b></font></P>      ]]></body>
<body><![CDATA[<P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">O presente trabalho analisa aspectos biotecnol&oacute;gicos gerais para o melhoramento das caracter&iacute;sticas agron&ocirc;micas de plantas hortofrutigranjeiras, utilizando a tecnologia do ADN recombinante, mediante a qual, tem-se logrado como objetivo a obten&ccedil;&atilde;o de plantas resistentes &agrave; insetos, fungos, bact&eacute;rias, herbicidas, com melhores caracter&iacute;sticas de qualidade durante a pre e p&oacute;s-colheita e com alto conte&uacute;do nutricional. Tem-se dado um foco especial aos aspectos biotecnol&oacute;gicos para o melhoramento da manga, uma vez que, durante as duas d&eacute;cadas passadas muito poucas cultivares t&ecirc;m sido melhoradas. Em alguns ensaios, os principais aspectos estudados s&atilde;o a efici&ecirc;ncia na indu&ccedil;&atilde;o de embri&otilde;es durante a embriogenese som&aacute;tica e na recupera&ccedil;&atilde;o de plantas, a indu&ccedil;&atilde;o ao acaso de mutantes para obter plantas resistentes &agrave; agentes seletivos e a transforma&ccedil;&atilde;o com genes que regulam certas caracter&iacute;sticas agron&ocirc;micas. A biotecnologia tem um alto potencial para prover solu&ccedil;&otilde;es alternativas a problemas que demandam n&atilde;o s&oacute; os  produtores de manga, mas tamb&eacute;m  para os demais produtores agr&iacute;colas.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"><b>Palabras clave</b> / Biotecnolog&iacute;a de Plantas / ADN Recombinante / Mango / Transformaci&oacute;n Gen&eacute;tica de Plantas /</font> </P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"><b>Recibido</b>: 26/08/2005. <b>Aceptado</b>: 13/12/2005.</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"><b>Aspectos Generales de la Biotecnolog&iacute;a en Plantas</b></font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">La biotecnolog&iacute;a tiene como objetivo el desarrollo de productos comerciales que contribuyan de forma ben&eacute;fica para la humanidad. Esta disciplina fue definida como la aplicaci&oacute;n de los conceptos te&oacute;ricos de la ingenier&iacute;a gen&eacute;tica, la microbiolog&iacute;a, la bioqu&iacute;mica y la ingenier&iacute;a qu&iacute;mica, para procesar materiales con el uso de agentes biol&oacute;gicos y proveer productos con mejor calidad. Emp&iacute;ricamente, por muchos a&ntilde;os los microorganismos tales como las bacterias y los hongos han sido utilizados en procesos de fermentaci&oacute;n; actualmente se sabe que tanto los microorganismos como las c&eacute;lulas de eucariontes superiores pueden ser modificados, transfiriendo unidades espec&iacute;ficas de informaci&oacute;n gen&eacute;tica de un organismo a otro para obtener organismos modificados con propiedades nuevas y &uacute;tiles para el ser humano (Glick y Pasternak, 1998).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Los principales problemas a los que se enfrenta la industria agr&iacute;cola son ocasionados principalmente por la competencia de las plantas con las malezas, el ataque de pat&oacute;genos tales como bacterias, hongos o virus, y el ataque por plagas de insectos, roedores y aves. Todo esto ocasiona la reducci&oacute;n del volumen de cosecha y la consecuente p&eacute;rdida econ&oacute;mica para los productores de granos, frutas y hortalizas. Muchas son las t&eacute;cnicas tradicionales de cultivo que se han empleado para contrarrestar dichos problemas. Entre ellas se encuentran el uso de productos qu&iacute;micos (fungicidas, insecticidas, herbicidas, etc), trampas, control biol&oacute;gico y el mejoramiento tradicional mediante la selecci&oacute;n de variantes y de l&iacute;neas resistentes (G&oacute;mez-Kosky, 1998). En poscosecha, las t&eacute;cnicas m&aacute;s comunes para la conservaci&oacute;n de productos perecederos son la refrigeraci&oacute;n, el encerado, los tratamientos qu&iacute;micos, la irradiaci&oacute;n, el tratamiento hidrot&eacute;rmico y la aplicaci&oacute;n de ceras y atm&oacute;sferas controladas (Carrillo-L&oacute;pez y F&eacute;lix, 1996)</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Sin embargo, muchas de estas tecnolog&iacute;as cuando son utilizadas inadecuadamente pueden ocasionar, en algunos casos, da&ntilde;os en los tejidos que pueden provocar una maduraci&oacute;n irregular, da&ntilde;o por fr&iacute;o, etc. y en otros, la acumulaci&oacute;n de residuos qu&iacute;micos, todo ello redundando en p&eacute;rdidas econ&oacute;micas. Como alternativa, la biotecnolog&iacute;a de plantas y en particular la transferencia de material gen&eacute;tico, representa una herramienta potencial para resolver problemas agr&iacute;colas con el m&iacute;nimo riesgo, debido a que es una tecnolog&iacute;a limpia, donde solo es modificada aquella caracter&iacute;stica que se quiere contrarrestar (Singh y Sansavini, 1998).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Los m&eacute;todos biotecnol&oacute;gicos y moleculares ofrecen una alternativa a las t&eacute;cnicas convencionales debido a que permiten introducir uno o mas genes para la correcci&oacute;n de deficiencias de cultivares l&iacute;deres (Mehlenbaker, 1995). La transformaci&oacute;n de genotipos altamente adaptados, y su producci&oacute;n, depender&aacute; de la estabilidad de la integraci&oacute;n del material gen&eacute;tico for&aacute;neo al genoma de la planta, seguida por la propagaci&oacute;n in vitro y la consecuente regeneraci&oacute;n para producir plantas intactas que expresen la informaci&oacute;n deseada (Singh y Sansavini, 1998).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Los altos niveles de productividad asociados con la agricultura moderna dependen generalmente de la protecci&oacute;n de las especies cultivables contra la competencia de las malas hierbas, el ataque de virus, hongos e insectos. De ah&iacute; que desde finales de los a&ntilde;os 40 estos agentes nocivos han sido controlados con el uso extensivo de productos qu&iacute;micos, trayendo consigo serios problemas agr&iacute;colas debido a su peligro potencial sobre los consumidores y sobre el ecosistema por el desarrollo de cultivares resistentes. La ventaja de la ingenier&iacute;a gen&eacute;tica en plantas es que provee de nuevos m&eacute;todos de protecci&oacute;n contra tales plagas, diminuyendo el potencial peligro del control qu&iacute;mico (Fuller y Gallon, 1995). A continuaci&oacute;n se mencionan algunas caracter&iacute;sticas que han sido manipuladas utilizando la biotecnolog&iacute;a molecular con la finalidad principal de reducir las grandes p&eacute;rdidas econ&oacute;micas en los productos hortofrut&iacute;colas.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Resistencia bacteriana. Las enfermedades bacterianas ocasionadas por Erwinia amilovora, Xantomonas campestris pv junglandis y Pseudomonas solanacearum por mencionar s&oacute;lo algunas, causan grandes p&eacute;rdidas en los productos hort&iacute;colas. Recientemente, genes antibacterianos como los que codifican para la prote&iacute;na lactoferrina fueron utilizados para transformar c&eacute;lulas de tabaco en cultivo, las cuales exhibieron actividad antimicrobiana (Sun-Mee et al., 2003). Otros genes sint&eacute;ticos o naturales han sido transferidos y expresados en plantas (Kuenhle et al., 1995); varios de ellos como el de la atacina, la lizosima, la lactoferrina y la cecropina B, o la SB5 (gene sint&eacute;tico) han sido utilizados para desarrollar vectores que se expresen en plantas (Hippe et al., 1989; Deste'fano-Beltran et al., 1990; Trudel et al., 1992; Duering et al., 1993; Tae-Jin et al., 2002).</font></P>      ]]></body>
<body><![CDATA[<P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Resistencia a hongos. Las p&eacute;rdidas econ&oacute;micas ocasionadas por hongos son muy elevadas, y el uso y abuso de los fungicidas como medidas de control aumentan el costo de la producci&oacute;n, seleccionan fitopat&oacute;genos resistentes y liberan residuos al ambiente. Se han desarrollado investigaciones sobre genes que codifican enzimas (estilbeno sintetasa) que est&aacute;n involucradas en la bios&iacute;ntesis de compuestos que son t&oacute;xicos para los hongos (Hain et al., 1990) y otros genes que codifican para enzimas que hidrolizan la pared celular de los hongos y por lo tanto son antif&uacute;ngicas, tales como las quitinasas y las glucanasas (Mikkelsen et al., 1992; Neuhaus et al., 1991). Zhue et al. (1994) mostraron que la co-expresion constitutiva de la quitinasa de arroz y la &szlig;-1,3-glucanasa de alfalfa en arroz dan una gran protecci&oacute;n contra Cercospora nicotinae. Los genes rip (prote&iacute;na que inactiva ribosomas) y de un p&eacute;ptido antimicrobiano semejante a la heve&iacute;na tambi&eacute;n han sido expresados en plantas para conferir resistencia contra hongos (Ja Choon et al., 2002; Ju-Kon et al., 2003).</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Tolerancia a herbicidas. Genes resistentes a herbicidas comerciales han sido aislados de microorganismos y plantas tales como el gen bar, aroA y als. El gen bar de Streptomyces hygroscopicus, que codifica para la fosfinotricina acetiltransferasa, provee resistencia mediada por la acetilaci&oacute;n de la fosfinotricina (herbicida Basta; Murakami et al., 1986). Cabrera-Ponce et al. (1995) reportaron que la papaya &quot;Maradol&quot; transg&eacute;nica que expresa el gen quim&eacute;rico nos-bar exhibe resistencia al herbicida Basta. Otros genes utilizados para el control de malas hierbas son el gen hpt (higromicina fosfotransferasa) y el gen del citocromo P50 (Ohkawa et al., 1999; Chen y Punja, 2002).</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Resistencia a insectos. Se han desarrollado plantas resistentes a insectos en las que se expresan genes tales como la d-endotoxina de Bacillus thuringiensis (Bt), inhibidores de proteasas, enzimas, metabolitos secundarios y lectinas de plantas. Los inhibidores de proteasas e inhibidores de tripsina afectan el sistema digestivo de los insectos. Se ha demostrado que las lectinas e inhibidores de proteasas afectan el crecimiento y desarrollo de los insectos y en muchas instancias no provocan su muerte (Hari et al., 2004). Los genes insecticidas que codifican para prote&iacute;nas (cristal Bt) aisladas de Bacillus thuringiensis son los genes mas com&uacute;nmente probados para la resistencia a insectos (Fischoff et al., 1987). Plantas transg&eacute;nicas de nuez que expresan la prote&iacute;na Bt han mostrado resistencia al gusano &quot;naval orange&quot; (Amyelois transiella; Dandekar et al., 1994). Los genes de avidina y estreptavina (prote&iacute;na que une biotina) han sido ensayados en tabaco y manzana para conferir resistencia contra insectos predadores Phthorimae operculella Zeller y Ephiphyas postvittana Walter, respectivamente (Markwick et al., 2003). El gen de la lectina gna de Galanthus nivalis confiri&oacute; resistencia contra BHP (&quot;brown planthopper&quot;) y GLH (&quot;green leafhopper&quot;; Nagadhara et al., 2003).</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Control de la maduraci&oacute;n. La maduraci&oacute;n de los frutos es considerada como un proceso metab&oacute;lico regulado durante el desarrollo. Originalmente, estos procesos fueron considerados procesos catab&oacute;licos en los que hab&iacute;a ruptura de la organizaci&oacute;n celular. Sin embargo, el desarrollo de nuevas herramientas anal&iacute;ticas han puesto de manifiesto que se trata de un proceso regulado bajo estricto control gen&eacute;tico (Gom&eacute;z-Lim, 1999).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Es bien conocido que los frutos tienen la capacidad para sintetizar prote&iacute;nas durante la maduraci&oacute;n (Tucker y Grierson, 1987). En varias frutas hay un considerable incremento en el contenido de las prote&iacute;nas durante este proceso. Por otro lado, tambi&eacute;n se ha reportado la s&iacute;ntesis de tRNA y rRNA y ciertos mensajeros (Marei y Romani, 1971). Se ha demostrado que ciertos mensajeros disminuyen, otros permanecen constantes y otros aumentan su expresi&oacute;n durante la maduraci&oacute;n (Piechulla et al., 1985).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Se ha aislado y examinado la expresi&oacute;n de genes espec&iacute;ficos de maduraci&oacute;n de una gran variedad de frutos, pero poco se conoce acerca de su papel fisiol&oacute;gico en el desarrollo del fruto y solamente unos pocos, como son los que codifican para poligalacturonasas, pectinmetilesterasas, ACC oxidasas y ACC sintetasas, est&aacute;n relacionadas con alguna funci&oacute;n particular de la maduraci&oacute;n (G&oacute;mez-Lim, 1999). Mediante t&eacute;cnicas de biolog&iacute;a molecular se ha expresado o bloqueado la expresi&oacute;n de algunas de estas enzimas. La <a href="#tab1"> Tabla I</a> muestra los procesos de la maduraci&oacute;n que han sido estudiados utilizando la transformaci&oacute;n gen&eacute;tica.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="center"><a name="tab1"></a></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="center"><font face="Verdana" size="2"><IMG SRC="/img/fbpe/inci/v31n2/Image1042.gif" WIDTH=573 HEIGHT=268></font></P>      
<P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Mejoramiento de la calidad nutricional. M&aacute;s de la mitad de la poblaci&oacute;n pobre del mundo depende fuertemente de la agricultura y cerca de 3 billones de personas est&aacute;n com&uacute;nmente mal nutridas por falta de micronutrientes y vitaminas, lo que trae como consecuencia aumento en la morbilidad y mortalidad (Koundal, 2001; Welch y Graham, 2004). M&aacute;s de las dos terceras partes de los ni&ntilde;os del mundo mueren debido a deficiencias nutricionales de Fe, Zn y vitamina A, por lo que es importante utilizar las estrategias del enriquecimiento de los productos agron&oacute;micos comestibles (fortificar o biofortificar) para aumentar los niveles nutricionales de los alimentos (Welch y Graham, 2004). Algunos ensayos para la fortificaci&oacute;n de alimentos, cual es el caso de las plantas transg&eacute;nicas de arroz (&quot;golden rice&quot;) con alto contenido de b-caroteno (precursor de la vitamina A), y el arroz con hierro (&quot;ferritin-Fe rice&quot;; Beyer et al., 2002; King, 2002). Tambi&eacute;n se ha elevado el contenido del amino&aacute;cido metionina en plantas de papa, mediante la inhibici&oacute;n de treonina sintetasa (Altenbach et al., 1989), as&iacute; como el contenido de lisina en tabaco mediante la sobreexpresi&oacute;n del gen dihidrodipicolinato sintetasa (Galili et al., 1997).</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><b><font face="Verdana" size="2">Estrategias de transformaci&oacute;n gen&eacute;tica</font> <font face="Verdana" size="2">en plantas</font></b> </P>     ]]></body>
<body><![CDATA[<P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Las t&eacute;cnicas de transformaci&oacute;n utilizadas para generar plantas transg&eacute;nicas se listan a continuaci&oacute;n (Glick y Pasternak, 1998).</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">- Transferencia mediada por el pl&aacute;smido Ti de Agrobacterium tumefaciens. Este es un sistema excelente y altamente eficiente, limitado principalmente a plantas monocotiled&oacute;neas.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">- Bombardeo con microproyectiles (biobal&iacute;stica). T&eacute;cnica utilizada en un amplio rango de plantas y tejidos. Es un m&eacute;todo f&aacute;cil y econ&oacute;mico.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">- Vectores virales. Una v&iacute;a no muy efectiva para cultivos celulares y plantas completas.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">- Transferencia directa a protoplastos. Puede usarse solo en protoplastos celulares de plantas que pueden ser regeneradas a plantas completas.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">- Microinyecci&oacute;n. Tiene uso limitado dado que s&oacute;lo una c&eacute;lula puede ser inyectada. Adem&aacute;s, requiere de entrenamiento altamente espec&iacute;fico.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">- Fusi&oacute;n de liposomas. Puede ser utilizado s&oacute;lo en protoplastos.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">- Electroporaci&oacute;n. Generalmente limitado a protoplastos.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Regeneraci&oacute;n de tejidos vegetales</font> <font face="Verdana" size="2">in vitro</font> </P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">El cultivo de tejidos no es un prerequisito para llevar a cabo la transformaci&oacute;n gen&eacute;tica de plantas, pero es empleado en casi todas las pr&aacute;cticas comunes de transformaci&oacute;n, para llevar la transferencia eficiente del gen y para la selecci&oacute;n y regeneraci&oacute;n de las transformantes (Gamborg y Phillips, 1995).</font></P>     ]]></body>
<body><![CDATA[<P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">En un sistema de cultivo de tejidos lo mas importante es obtener un gran n&uacute;mero de c&eacute;lulas regenerables que sean accesibles para la transformaci&oacute;n gen&eacute;tica y que puedan conservar la capacidad de regeneraci&oacute;n durante la proliferaci&oacute;n celular y los tratamientos de selecci&oacute;n (Livingstone y Birch, 1995). No hay preferencia de utilizar la embriog&eacute;nesis o la organog&eacute;nesis en la regeneraci&oacute;n de plantas transformadas.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Embriog&eacute;nesis som&aacute;tica. Es la formaci&oacute;n de un embri&oacute;n a partir de una c&eacute;lula sin que se haya dado la fusi&oacute;n de gametos. No es un fen&oacute;meno artificial y se le conoce en la naturaleza como una forma de apomixis llamada embrion&iacute;a adventicia. La embriog&eacute;nesis som&aacute;tica es un fen&oacute;meno biol&oacute;gico basado en la totipotencialidad de las c&eacute;lulas vegetales. Esta teor&iacute;a expone la posibilidad de regenerar plantas completas a partir de cualquier c&eacute;lula de la planta, debido a que cada c&eacute;lula tiene la informaci&oacute;n gen&eacute;tica necesaria para producir un organismo completo (G&oacute;mez-Kosky, 1998).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Los embriones som&aacute;ticos se definen como una estructura bipolar producida de manera asexual, sin conexi&oacute;n vascular con el tejido madre. Contrariamente a los embriones cig&oacute;ticos, los som&aacute;ticos no contienen un nuevo juego de genes, sino que conservan la misma combinaci&oacute;n gen&eacute;tica del progenitor del cual es originario. Estas estructuras bipolares son capaces de crecer y formar plantas normales. El desarrollo de un sistema experimental para la regeneraci&oacute;n de plantas v&iacute;a embriog&eacute;nesis som&aacute;tica incluye los siguientes pasos: inducci&oacute;n de embriones som&aacute;ticos, desarrollo, proliferaci&oacute;n, maduraci&oacute;n, germinaci&oacute;n y regeneraci&oacute;n a planta completa (G&oacute;mez-Kosky, 1998).</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Organog&eacute;nesis. La organog&eacute;nesis es un evento morfogen&eacute;tico que se caracteriza por su desarrollo unipolar, es decir, la formaci&oacute;n de un primordio unipolar a partir de una yema, con el subsecuente desarrollo de aquel en un brote vegetativo, existiendo siempre una conexi&oacute;n entre los nuevos brotes y el tejido paterno. Estos brotes vegetativos son posteriormente puestos a enraizar en otra etapa, v&iacute;a formaci&oacute;n de primordios de ra&iacute;ces y el subsecuente enraizamiento final. En la organog&eacute;nesis directa los brotes se forman directamente del explante y en la organog&eacute;nesis indirecta lo hacen a partir de la formaci&oacute;n de callos (Jim&eacute;nez-Gonz&aacute;lez, 1998).</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"><b>Aspectos Biotecnol&oacute;gicos del Mango</b></font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">El mango (Mangifera indica L.) tuvo su origen en la India, donde ha sido cultivado por m&aacute;s de 4000 a&ntilde;os. En M&eacute;xico la introducci&oacute;n del mango tuvo lugar en 1779 (Mosqueda et al., 1996). Actualmente M&eacute;xico ocupa el tercer lugar en producci&oacute;n, tras India y China, y es sin duda el pa&iacute;s que mayor volumen exporta, siendo los EEUU, el principal pa&iacute;s importador (www.fao.org).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Las variedades actualmente cultivadas en M&eacute;xico son Haden, Tommy Atkins, Kent, Keitt, Ataulfo, Zill, Sensation, Oro, Manila, Manililla y otros materiales criollos (Agrovisi&oacute;n, 1994). Las primeras cuatro variedades, y recientemente la Ataulfo, han sido las variedades con mayor demanda en el mercado de exportaci&oacute;n (Agromundo, 1996; www.mangoemex.org.mx).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">La industria del mango se ve seriamente afectada por plagas y enfermedades. Es bien conocido que la antracnosis provocada por Colletotrichum gloeosporioides Penz es una enfermedad de alta dispersi&oacute;n e incidencia durante la floraci&oacute;n y maduraci&oacute;n de los frutos de mango, es controlada mediante la aplicaci&oacute;n de productos qu&iacute;micos y en los frutos con el tratamiento hidrot&eacute;rmico. Con respecto a las plagas, las moscas de la fruta son las plagas mas importantes para los productores de mango a nivel mundial y especialmente para M&eacute;xico, por ser el principal exportador en el mercado internacional. El trampeo es la medida de control m&aacute;s importante, as&iacute; como el tratamiento hidrot&eacute;rmico para los frutos de exportaci&oacute;n (Lizada, 1993).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Con la finalidad de contrarrestar algunos de los problemas m&aacute;s significativos en la producci&oacute;n del mango, existen programas de mejoramiento de cultivares donde se seleccionan variantes y l&iacute;neas resistentes. Sin embargo, el mejoramiento por esta v&iacute;a es dif&iacute;cil debido al largo per&iacute;odo juvenil del &aacute;rbol (G&oacute;mez Lim, 1999).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Mediante la variaci&oacute;n somaclonal que existe durante varios ciclos de cultivo en un sistema de cultivo de c&eacute;lulas y de tejidos in vitro pueden obtenerse variantes genot&iacute;picas y fenot&iacute;picas. Sin embargo, no han sido reportadas en mango, pero s&iacute; en otros frutos perecederos tales como pl&aacute;tano, fresas y c&iacute;tricos (Nehra et al., 1992; Starrantino et al., 1998; Ramage et al., 2004).</font></P>     ]]></body>
<body><![CDATA[<P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Por otro lado, la selecci&oacute;n in vitro de l&iacute;neas de mango resistentes a Colletotrichum gloeosporoides fue reportado por Litz et al. (1991) y por Mathews y Litz (1992). En 1995, Jayasakar (1995) report&oacute; que cultivares embriog&eacute;nicos Hindi y Carabao sujetos a selecci&oacute;n en presencia de cultivo filtrado purificado y parcialmente purificado de una cepa virulenta de C. gloeosporoides inhibieron el crecimiento del hongo debido a la presencia de dos hidrolasas extracelulares (quitinasas y beta-1,3-glucanasa).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">El mango tiene la caracter&iacute;stica de ser un producto altamente perecedero y por lo tanto con corta vida de almacenamiento, por lo que debe ser consumido en un per&iacute;odo corto despu&eacute;s de su cosecha. Es un fruto climat&eacute;rico en donde el etileno juega un papel mayoritario durante la maduraci&oacute;n. La estrategia com&uacute;n para extender la vida poscosecha y su disponibilidad es almacenar los frutos a bajas temperaturas y despu&eacute;s exponerlos a etileno para su maduraci&oacute;n (Lizada, 1993).</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Genes de la ACC oxidasa, enzima involucrada en la producci&oacute;n del etileno y la oxidasa alterna, han sido clonados (G&oacute;mez-Lim, 1997) y podr&iacute;an utilizarse para el control de la maduraci&oacute;n del mango. La transformaci&oacute;n gen&eacute;tica con algunos de estos genes utilizando el mRNA en antisentido ha sido efectiva para bloquear la maduraci&oacute;n de los frutos. Cruz-Hern&aacute;ndez y Litz (1997) transformaron embriones de mango Hindi con A. tumefaciens LBA4404 que conten&iacute;a genes en antisentido en un vector binario pBI121: ACC oxidasa, ACC sintetasa y la oxidasa alterna. Sin embargo, la maduraci&oacute;n y la regeneraci&oacute;n del material no fue eficiente.</font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Otras t&eacute;cnicas moleculares, relacionadas con marcadores moleculares y bioqu&iacute;micos, han sido utilizadas tambi&eacute;n en estudios biotecnol&oacute;gicos de mango. En el caso de marcadores de prote&iacute;nas, las isoenzimas son muy utilizadas como marcadores bioqu&iacute;micos. Degani et al., 1992 utiliz&oacute; isoenzimas para identificar el posible parentesco entre cultivares. Schenell y Knight (1992) reportaron que el cultivar Keitt no ten&iacute;a ning&uacute;n parentesco con Mulgoba, al cual se le atribu&iacute;a su origen, gracias a un an&aacute;lisis de bandeo con IDH (isocitrato deshidrogenasa). En el caso de marcadores de ADN, Schenell et al., (1995) usaron an&aacute;lisis con marcadores de ADN usando RAPD (&quot;Rapid Amplified Polimorfic ADN&quot;) para identificar cultivares de mango y determinar la relaci&oacute;n gen&eacute;tica entre cultivares. En 1997, L&oacute;pez-Valenzuela et al. estimaron la diversidad gen&eacute;tica entre 15 cultivares de mango utilizando marcadores de ADN (RAPD).</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"><b>Potencial Biotecnol&oacute;gico para el Mejoramiento del Mango</b></font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">La biotecnolog&iacute;a mediada por la ingenier&iacute;a gen&eacute;tica tiene potencial para contrarrestar los siguientes problemas durante la producci&oacute;n del mango.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Alternancia. Se ha reportado que la actividad en el meristemo de la flor del gen LEAFY de Arabidopsis caus&oacute; inicio en la floraci&oacute;n en &aacute;lamo transg&eacute;nico (Weigel y Nilsson, 1995), por lo que puede ser posible sobrellevar los problemas de alternancia utilizando este gen bajo un apropiado promotor de desarrollo.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Talla del &aacute;rbol. Mediante la introducci&oacute;n del gen rolC en plantas transg&eacute;nicas de mango es posible generar plantas de menor tama&ntilde;o. El gen rolC de Agrobacterium rhizogenes ha sido reportado con potencial para el control del tama&ntilde;o de &aacute;rbol y generar plantas peque&ntilde;as (Oono et al., 1987; Koshita et al., 2002; Boase et al., 2004).</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Control de la maduraci&oacute;n de frutos. Esto puede ser realizado mediante la utilizaci&oacute;n de estrategias del antisentido con genes tal como la ACC oxidasa con promotores dirigidos para su expresi&oacute;n en fruto.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Control de enfemedades. La transformaci&oacute;n gen&eacute;tica del mango con genes de defensa (defensinas y magaininas) as&iacute; como los genes de quitinasas y glucanasas podr&aacute;n conferir resistencia contra enfermedades ocasionada por bacterias y hongos.</font></P>      ]]></body>
<body><![CDATA[<P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Control de insectos. Es posible realizar la transformaci&oacute;n gen&eacute;tica del mango con algunos de los genes Bt y las proteinas insecticidas X-endotoxinas, las cuales han sido utilizadas para el control de insectos en varias plantas.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">Selecci&oacute;n de genotipos. Mediante el uso de los marcadores de ADN es posible seleccionar genotipos especiales los cuales servir&iacute;an para reducir el n&uacute;mero de cruzas utilizados en los procedimientos tradicionales para mejorar caracter&iacute;sticas espec&iacute;ficas.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"><b>Conclusi&oacute;n</b></font></P>     <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">La biotecnolog&iacute;a tiene potencial para proveer soluciones alternativas a los problemas que angustian a los productores de mango. Los sistemas de regeneraci&oacute;n in vitro pueden ser refinados para cada cultivar y ser utilizados en la propagaci&oacute;n clonal de cultivares comerciales y en la conservaci&oacute;n de germoplasma, as&iacute; como durante la transformaci&oacute;n gen&eacute;tica. La transformaci&oacute;n gen&eacute;tica del mango puede generar plantas resistentes a enfermedades y plagas, resolver o minimizar problemas de precosecha y poscosecha. Esto ciertamente es una promesa, donde es necesario trabajar para el perfeccionamiento de los protocolos biotecnol&oacute;gicos y as&iacute; poder solventar dichos problemas.</font></P>      <P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"><b>Referencias</b></font></P>     <!-- ref --><P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">1. Agromundo (1996) Vol. 14 Nº 83. Jul-Ago. M&eacute;xico.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1017295&pid=S0378-1844200600020000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">2. Agrovisi&oacute;n (1994) M&eacute;xico en la &oacute;rbita del mercado mundial del mango. Nº 1. M&eacute;xico.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1017296&pid=S0378-1844200600020000400002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">3. Altenbach SB, Pearson KW, Meeker G, Staraci LC, Sun SSM (1989) Enhancement of the methionine content of seed protein by the expression of a chimeric gene encoding a methionine-rich protein in transgenic plants. Plant Mol. Biol. 13: 513-522B.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1017297&pid=S0378-1844200600020000400003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">4. Beyer P, Al-Babili S, Ye X, Lucca P, Schaub P, Welsch R, Potrykus I (2002) Golden rice: Introducing the (beta)-carotene biosynthesis pathway into rice endosperm by genetic engineering to defeat vitamin A deficiency. J. Nutr. 132: 506S-510S.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1017298&pid=S0378-1844200600020000400004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><P style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2">5. Boase MR, Winefield CS, Lill TA, Bendall MJ (2004) Transgenic regal pelargoniums that express the rolC gene from Agrobacterium rhizogenes exhibit a dwarf floral and vegetative genotype. In Vitro Cell. Dev. 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