<?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>1870-0462</journal-id>
<journal-title><![CDATA[Tropical and subtropical agroecosystems]]></journal-title>
<abbrev-journal-title><![CDATA[Trop. subtrop. agroecosyt]]></abbrev-journal-title>
<issn>1870-0462</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma de Yucatán, Facultad de Medicina Veterinaria]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-04622011000200002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Fitorremediación: una alternativa para eliminar la contaminación]]></article-title>
<article-title xml:lang="en"><![CDATA[Phytoremediation: an alternative to eliminate pollution]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delgadillo-López]]></surname>
<given-names><![CDATA[Angélica Evelin]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Ramírez]]></surname>
<given-names><![CDATA[César Abelardo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prieto-García]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villagómez-Ibarra]]></surname>
<given-names><![CDATA[José Roberto]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acevedo-Sandoval]]></surname>
<given-names><![CDATA[Otilio]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo Instituto de Ciencias Básicas e Ingeniería Centro de Investigaciones Químicas]]></institution>
<addr-line><![CDATA[Mineral de la Reforma Hidalgo]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo Instituto de Ciencias Básicas e Ingeniería Centro de Investigaciones Químicas]]></institution>
<addr-line><![CDATA[Mineral de la Reforma Hidalgo]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2011</year>
</pub-date>
<volume>14</volume>
<numero>2</numero>
<fpage>597</fpage>
<lpage>612</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-04622011000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-04622011000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-04622011000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La fitorremediación aprovecha la capacidad de ciertas plantas para absorber, acumular, metabolizar, volatilizar o estabilizar contaminantes presentes en el suelo, aire, agua o sedimentos como: metales pesados, metales radioactivos, compuestos orgánicos y compuestos derivados del petróleo. Estas fitotecnologías ofrecen numerosas ventajas en relación con los métodos fisicoquímicos que se usan en la actualidad, por ejemplo, su amplia aplicabilidad y bajo costo. En esta revisión se presenta un panorama de las diversas técnicas fitocorrectivas empleadas para restaurar suelos y efluentes contaminados; así como del potencial que ofrece el uso de plantas transgénicas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Phytoremediation consists of a set of technologies that exploit the ability of some plants to absorb, accumulate, metabolize, volatilize or stabilize pollutants that are present in soil, air, water or sediments such as: heavy metals, radioactive metals, organic compounds, and compounds derived from petroleum. Phytoremediation offers numerous advantages in relation to the physicochemical methods that are used nowadays, for example, its wide applicability and low cost. This review provides an overview of the various phytocorrective techniques employed for remediation of polluted soil and water; as well as the potencial that offers the use of transgenic plants.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[transporte]]></kwd>
<kwd lng="es"><![CDATA[fitotecnologías]]></kwd>
<kwd lng="es"><![CDATA[plantas transgénicas]]></kwd>
<kwd lng="es"><![CDATA[metales pesados]]></kwd>
<kwd lng="es"><![CDATA[contaminantes orgánicos]]></kwd>
<kwd lng="en"><![CDATA[transport]]></kwd>
<kwd lng="en"><![CDATA[phytotechnologies]]></kwd>
<kwd lng="en"><![CDATA[transgenic plants]]></kwd>
<kwd lng="en"><![CDATA[heavy metals]]></kwd>
<kwd lng="en"><![CDATA[organic pollutants]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Revisi&oacute;n</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>Fitorremediaci&oacute;n: una alternativa para eliminar la contaminaci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Phytoremediation: an alternative to eliminate pollution</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Ang&eacute;lica Evelin Delgadillo&#45;L&oacute;pez<sup>1</sup>*, C&eacute;sar Abelardo Gonz&aacute;lez&#45;Ram&iacute;rez<sup>1</sup>,</b> <b>Francisco Prieto&#45;Garc&iacute;a<sup>1</sup>, Jos&eacute; Roberto Villag&oacute;mez&#45;Ibarra<sup>1</sup></b> <b>and Otilio Acevedo&#45;Sandoval<sup>2</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Universidad Aut&oacute;noma del Estado de Hidalgo, Instituto de Ciencias B&aacute;sicas e Ingenier&iacute;a, Centro de Investigaciones Qu&iacute;micas. Carr. Pachuca&#45;Tulancingo Km 4.5, Mineral de la Reforma, Hidalgo, M&eacute;xico. C.P. 42184. 	* Corresponding Author Email:</i> <a href="mailto:angel21930@yahoo.com.mx">angel21930@yahoo.com.mx</a>.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Universidad Aut&oacute;noma del Estado de Hidalgo, Instituto de Ciencias B&aacute;sicas e Ingenier&iacute;a, Centro de Investigaciones en Ciencias de la Tierra. Carr. Pachuca&#45;Tulancingo Km 4.5, Mineral de la Reforma, Hidalgo, M&eacute;xico. C.P. 42184.</i></font></p>        <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Submitted August 31, 2010    <br> 	Accepted December 01, 2010    <br> 	Revised received January 10, 2011</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">La fitorremediaci&oacute;n aprovecha la capacidad de ciertas plantas para absorber, acumular, metabolizar, volatilizar o estabilizar contaminantes presentes en el suelo, aire, agua o sedimentos como: metales pesados, metales radioactivos, compuestos org&aacute;nicos y compuestos derivados del petr&oacute;leo. Estas fitotecnolog&iacute;as ofrecen numerosas ventajas en relaci&oacute;n con los m&eacute;todos fisicoqu&iacute;micos que se usan en la actualidad, por ejemplo, su amplia aplicabilidad y bajo costo. En esta revisi&oacute;n se presenta un panorama de las diversas t&eacute;cnicas fitocorrectivas empleadas para restaurar suelos y efluentes contaminados; as&iacute; como del potencial que ofrece el uso de plantas transg&eacute;nicas.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> transporte, fitotecnolog&iacute;as, plantas transg&eacute;nicas, metales pesados, contaminantes org&aacute;nicos.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Phytoremediation consists of a set of technologies that exploit the ability of some plants to absorb, accumulate, metabolize, volatilize or stabilize pollutants that are present in soil, air, water or sediments such as: heavy metals, radioactive metals, organic compounds, and compounds derived from petroleum. Phytoremediation offers numerous advantages in relation to the physicochemical methods that are used nowadays, for example, its wide applicability and low cost. This review provides an overview of the various phytocorrective techniques employed for remediation of polluted soil and water; as well as the potencial that offers the use of transgenic plants.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> transport, phytotechnologies, transgenic plants, heavy metals, organic pollutants.</font></p>  	    <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">Uno de los rasgos caracter&iacute;sticos de la sociedad moderna es la creciente emisi&oacute;n al ambiente de sustancias contaminantes, destacando aquellas que proceden de las actividades industriales, mineras, agropecuarias, artesanales y dom&eacute;sticas. Estos compuestos representan una amenaza para los seres vivos, por lo que se han desarrollado una serie de m&eacute;todos para enmendar el impacto causado. Los m&eacute;todos convencionales suelen ser costosos (<a href="/img/revistas/tsa/v14n2/a2t1.jpg" target="_blank">Tabla 1</a>) y pueden afectar de manera irreversible las propiedades del suelo, agua y de los seres vivos que en ellos habitan (Padmavathiamma y Li, 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">El aumento de los costos y la limitada eficacia de los tratamientos fisicoqu&iacute;micos han estimulado el desarrollo de nuevas tecnolog&iacute;as. Por lo que, la fitorremediaci&oacute;n representa una alternativa sustentable y de bajo costo para la rehabilitaci&oacute;n de ambientes afectados por contaminantes naturales y antropog&eacute;nicos (Singh y Jain, 2003; Reichenauer y Germida, 2008).</font></p>  	    <p align="justify"><font face="verdana" size="2">La fitorremediaci&oacute;n es un conjunto de tecnolog&iacute;as que reducen <i>in situ</i> o <i>ex situ</i> la concentraci&oacute;n de diversos compuestos a partir de procesos bioqu&iacute;micos realizados por las plantas y microorganismos asociados a ellas.</font></p>  	    <p align="justify"><font face="verdana" size="2">La fitorremediaci&oacute;n utiliza las plantas para remover, reducir, transformar, mineralizar, degradar, volatilizar o estabilizar contaminantes (Kelley <i>et al,</i> 2000; Miretzky <i>et al.,</i> 2004; Cherian y Oliveira, 2005; Eapen <i>et al.,</i> 2007; Cho <i>et al.,</i> 2008). Se han identificado una amplia diversidad de especies que se emplean para este fin. Algunas de ellas, debido a su gran capacidad para acumular metales pesados, reciben el nombre de hiperacumuladoras. Por definici&oacute;n, estas plantas deben acumular al menos 100 &#956;g/g (0.01 % peso seco) de Cd y As; 1000 &#956;g/g (0.1 % peso seco) de Co, Cu, Cr, Ni y Pb; y 10 000 &#956;g/g (1.0 % peso seco) de Mn (Watanabe, 1997; Reeves <i>et al,</i> 1999; McGrath <i>et al,</i> 2001; Kamal <i>et al,</i> 2004; Yang <i>et al,</i> 2004; Reeves, 2006; Padmavathiamma y Li, 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">Esta tecnolog&iacute;a se hace m&aacute;s efectiva a trav&eacute;s de la manipulaci&oacute;n gen&eacute;tica, lo que mejora la capacidad de remediaci&oacute;n de las plantas (Cherian y Oliveira; 2005). Se han dise&ntilde;ado especies vegetales con una mayor capacidad de degradaci&oacute;n de contaminantes org&aacute;nicos o de acumulaci&oacute;n de metales pesados.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Algunas plantas gen&eacute;ticamente modificadas (GM) est&aacute;n adaptadas espec&iacute;ficamente para la fitorremediaci&oacute;n de Cd, Hg o bifenilos policlorados (PCB's) (Raskin, 1996; Meagher, 2000; Pilon&#45;Smithy Pil&oacute;n 2002; Eapen <i>et al,</i> 2007; Macek <i>et al,</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">En esta revisi&oacute;n se hace un an&aacute;lisis de las diversas tecnolog&iacute;as de fitorremediaci&oacute;n, as&iacute; como del papel que juega la pr&oacute;xima generaci&oacute;n de plantas GM para la remediaci&oacute;n, prevenci&oacute;n y reducci&oacute;n de la contaminaci&oacute;n en los diferentes sectores del ambiente.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Tipos de contaminantes</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La contaminaci&oacute;n del ambiente se produce por la incorporaci&oacute;n de cualquier tipo de energ&iacute;a, organismo o sustancia, que afecta las caracter&iacute;sticas de los ecosistemas, modificando negativamente sus propiedades y su capacidad para asimilarlas o degradarlas. Su entrada se realiza como consecuencia de las actividades antropog&eacute;nicas, aunque tambi&eacute;n se puede producir de forma natural. De manera general, los contaminantes se clasifican en:</font></p>  	    <p align="justify"><font face="verdana" size="2">Contaminantes org&aacute;nicos: incluyen hidrocarburos arom&aacute;ticos polic&iacute;clicos (PAH's), PCB's, dioxinas, hidrocarburos de petr&oacute;leo, disolventes clorados, compuestos arom&aacute;ticos que se emplean en la producci&oacute;n de colorantes, explosivos, productos farmac&eacute;uticos, plaguicidas (herbicidas, insecticidas y fungicidas), surfactantes, entre otros. En comparaci&oacute;n con los compuestos inorg&aacute;nicos, estos contaminantes son menos t&oacute;xicos para las plantas, ya que son menos reactivos y se acumulan en menor proporci&oacute;n (Cherian y Oliveira; 2005).</font></p>  	    <p align="justify"><font face="verdana" size="2">Contaminantes inorg&aacute;nicos: incluyen a los metales pesados como Co, Cr o Cu, elementos no met&aacute;licos como el As y B (Navarro&#45;Avi&ntilde;&oacute; <i>et al,</i> 2007), y radion&uacute;clidos como <sup>60</sup>Co y <sup>137</sup>Cs (Peles <i>et al,</i> 2002; Popa <i>et al,</i> 2004). Algunos elementos traza son esenciales para la nutrici&oacute;n y crecimiento de plantas (B, Cu, Fe, Mn, Mo y Zn) y animales (As, Cu, Co, Fe, Mn, Mo, Zn, Cr, F, Ni, Se, Sn y V). La toxicidad de estos elementos depende de la concentraci&oacute;n, la forma qu&iacute;mica y su persistencia. (Adriano <i>et al,</i> 2004; Navarro&#45;Avi&ntilde;&oacute; <i>et al,</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">En general, los mecanismos involucrados en la remoci&oacute;n de contaminantes son de tres tipos: f&iacute;sicos (sedimentaci&oacute;n, filtraci&oacute;n, adsorci&oacute;n, volatilizaci&oacute;n), qu&iacute;micos (precipitaci&oacute;n, hidr&oacute;lisis, reacciones de &oacute;xido&#45;reducci&oacute;n o fotoqu&iacute;micas) y biol&oacute;gicos (resultado del metabolismo microbiano, del metabolismo de plantas o de procesos de bioabsorci&oacute;n).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Transporte de contaminantes org&aacute;nicos</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Algunas plantas tienen la capacidad para metabolizar o acumular compuestos org&aacute;nicos como el 1,1,1&#45;tricloro&#45;2,2&#45;bis(4&#45;clorofenil)&#45;etano (DDT), tricloroetileno (TCE), 2,4&#45;diclorofenol, PCB's, explosivos como el trinitrotolueno (TNT) o dinitrotolueno, PAH's y detergentes (<a href="/img/revistas/tsa/v14n2/a2t2.jpg" target="_blank">Tabla 2</a>).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los microorganismos que habitan en la riz&oacute;sfera juegan un papel importante en la degradaci&oacute;n de la materia org&aacute;nica. Los metabolitos generados de esta degradaci&oacute;n son absorbidos por las plantas junto con nitr&oacute;geno, f&oacute;sforo y otros minerales (Garbisu <i>et al,</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">Algunos compuestos org&aacute;nicos son utilizados por los microorganismos como fuente de carbono (Vi&ntilde;as, 2005). Los compuestos alif&aacute;ticos se degradan f&aacute;cilmente por oxidaciones sucesivas. Cuando se incluyen como sustituyentes al&eacute;anos de cadena larga, se forman estructuras ramificadas estancamente inaccesibles a la degradaci&oacute;n. Los compuestos arom&aacute;ticos o c&iacute;clicos se degradan a partir de la ruptura del anillo. La incorporaci&oacute;n de hal&oacute;genos disminuye la degradabilidad por estabilizaci&oacute;n del anillo arom&aacute;tico. El orden decreciente de biodegradaci&oacute;n es, generalmente, n&#45;alcanos &gt; isoprenoides &gt;arom&aacute;ticos de bajo peso molecular &gt; cicloalcanos &gt; poliarom&aacute;ticos &gt; mol&eacute;culas polares (Leahy y Colwell, 1990).</font></p>  	    <p align="justify"><font face="verdana" size="2">Otro fen&oacute;meno importante es el relacionado con la atracci&oacute;n electrost&aacute;tica entre las cargas el&eacute;ctricas de las ra&iacute;ces de las plantas con las cargas opuestas de part&iacute;culas coloidales, las cuales se adhieren a la superficie de la ra&iacute;z donde son absorbidas y transportadas a las partes a&eacute;reas donde se metabolizan o volatilizan. El tipo de planta y las propiedades f&iacute;sicas y qu&iacute;micas de estos compuestos son par&aacute;metros importantes que determinan el destino de los contaminantes (Eapen <i>et al.,</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">Para la fitorremediaci&oacute;n de contaminantes org&aacute;nicos se toma en cuenta los siguientes aspectos: 1) el metabolismo de los contaminantes al interior y al exterior de la planta (riz&oacute;sfera), 2) los procesos que conducen a la completa degradaci&oacute;n de los contaminantes (mineralizaci&oacute;n), y 3) la absorci&oacute;n de los contaminantes (Reichenauer y Germida, 2008).</font></p>  	    <p align="justify"><font face="verdana" size="2">Las plantas metabolizan los compuestos org&aacute;nicos a trav&eacute;s de tres pasos secuenciales:</font></p>  	    <p align="justify"><font face="verdana" size="2">Fase I. Involucra la conversi&oacute;n/activaci&oacute;n (oxidaci&oacute;n, reducci&oacute;n e hidr&oacute;lisis) de los compuestos org&aacute;nicos lipof&iacute;licos (Komives y Gullner, 2005).</font></p>  	    <p align="justify"><font face="verdana" size="2">Fase II. Permite la conjugaci&oacute;n de los metabolitos de la fase I a una mol&eacute;cula hidrof&iacute;lica end&oacute;gena como los az&uacute;cares, amino&aacute;cidos y glutationa (Diet y Schnoor, 2001).</font></p>  	    <p align="justify"><font face="verdana" size="2">Fase III. Promueve la compartimentalizaci&oacute;n de los compuestos org&aacute;nicos modificados en las vacuolas o formaci&oacute;n de enlaces con los componentes de la pared celular como la lignina y la hemicelulosa. Las enzimas, en la planta, que catalizan la primera fase de las reacciones son las monoxigenasas P450 y las carboxilesterasas. De la segunda fase, en la que ocurre la conjugaci&oacute;n por enzimas como la glutationa S&#45;transferasa, resulta la formaci&oacute;n de compuestos solubles y polares. La tercera fase del metabolismo de la planta es la compartimentalizaci&oacute;n y almacenamiento de los metabolitos solubles en las vacuolas o en la matriz de la pared celular. La glutationa S&#45;conjugasa es la encargada de este proceso (Cheriany Oliveira, 2005).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Transporte de contaminantes inorg&aacute;nicos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los metales pesados son aquellos elementos qu&iacute;micos que presentan una densidad igual o superior a 5 g/cm<sup>3</sup> cuando est&aacute;n en forma elemental o cuyo n&uacute;mero at&oacute;mico es superior a 20 (Vardanyan y Ingole, 2006). Muestran una elevada tendencia a bioacumularse y a biomagnificarse a trav&eacute;s de su paso por los distintos eslabones de las cadenas tr&oacute;ficas. En concentraciones elevadas, ocasionan graves problemas en el desarrollo, crecimiento y reproducci&oacute;n de los seres vivos (Roy <i>et al.,</i> 2005).</font></p>  	    <p align="justify"><font face="verdana" size="2">Los mecanismos de tolerancia var&iacute;an entre las distintas especies de plantas y est&aacute;n determinados por el tipo de metal, eficiencia de absorci&oacute;n, traslocaci&oacute;n y secuestro. Las fases del proceso por el cual las plantas incorporan y acumulan metales pesados son las siguientes (Navarro&#45;Avi&ntilde;&oacute;, 2007):</font></p>  	    <p align="justify"><font face="verdana" size="2">Fase I. Implica el transporte de los metales pesados al interior de la planta y, despu&eacute;s, al interior de la c&eacute;lula. La ra&iacute;z constituye el tejido de entrada principal de los metales, los cuales llegan por difusi&oacute;n en el medio, mediante flujo masivo o por intercambio cati&oacute;nico. La ra&iacute;z posee cargas negativas en sus c&eacute;lulas, debido a la presencia de grupos carboxilo, que interaccionan con las positivas de los metales pesados, creando un equilibrio din&aacute;mico que facilita la entrada hacia el interior celular, ya sea por v&iacute;a apopl&aacute;stica o simpl&aacute;stica (Navarro&#45;Avi&ntilde;o, 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">Fase II. Una vez dentro de la planta, las especies met&aacute;licas son secuestradas o acomplejadas mediante la uni&oacute;n a ligandos espec&iacute;ficos. Entre los quelantes producidos por las plantas se encuentran los &aacute;cidos org&aacute;nicos (&aacute;cidos c&iacute;trico, ox&aacute;lico y m&aacute;lico), algunos amino&aacute;cidos (histidina y ciste&iacute;na) y dos clases de p&eacute;ptidos: fitoquelatinas y metalote&iacute;nas.</font></p>  	    <p align="justify"><font face="verdana" size="2">Las fitoquelatinas son ligandos de alta afinidad que tienen como sustrato al glutati&oacute;n. Est&aacute;n constituidas b&aacute;sicamente por 3 amino&aacute;cidos: &aacute;cido glut&aacute;mico, ciste&iacute;na y glicina, unidos por enlaces pept&iacute;dicos.</font></p>  	    <p align="justify"><font face="verdana" size="2">Las metalotioneinas son polip&eacute;ptidos de unos 70&#45;75 amino&aacute;cidos con un alto contenido en ciste&iacute;na, amino&aacute;cido capaz de formar complejos con cationes mediante el grupo sulfidrilo. Tienen una marcada afinidad por las formas i&oacute;nicas de Zn, Cd, Hg y Cu.</font></p>  	    <p align="justify"><font face="verdana" size="2">Fase III. Involucra la compartimentalizaci&oacute;n y detoxificaci&oacute;n, proceso por el cual, el complejo ligando&#45;metal queda retenido en la vacuola.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Tecnolog&iacute;as de fitorremediaci&oacute;n</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Las fitotecnolog&iacute;as se basan en los mecanismos fisiol&oacute;gicos b&aacute;sicos que tienen lugar en las plantas y en los microorganismos asociados a ellas, tales como: traspiraci&oacute;n, fotos&iacute;ntesis, metabolismo y nutrici&oacute;n (<a href="#t3">Tabla 3</a>).</font></p>  	    <p align="center"><font face="verdana" size="2"><a name="t3"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="/img/revistas/tsa/v14n2/a2t3.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Seg&uacute;n Thangavel y Subhuram (2004), dependiendo del tipo de contaminante, las condiciones del sitio y el nivel de limpieza requerido; las tecnolog&iacute;as de fitorremediaci&oacute;n se pueden utilizar como medio de contenci&oacute;n (rizofiltraci&oacute;n, fitoestabilizaci&oacute;n y fitoinmovilizaci&oacute;n) o eliminaci&oacute;n (fitodegradaci&oacute;n, fitoextracci&oacute;n y fitovolatilizaci&oacute;n).</font></p>  	    <p align="justify"><font face="verdana" size="2">La fitoestabilizaci&oacute;n permite inmovilizar contaminantes en el suelo a trav&eacute;s de su absorci&oacute;n y acumulaci&oacute;n en las ra&iacute;ces o bien, por precipitaci&oacute;n en la zona de la rizosfera. Este proceso reduce la movilidad de los contaminantes y evita su migraci&oacute;n a las aguas subterr&aacute;neas o al aire (Barton <i>et al.,</i> 2005 M&eacute;ndez y Maier, 2008,). La fitoestabilizaci&oacute;n es efectiva en suelos de textura fina con alto contenido de materia org&aacute;nica (Padmavathiamma y Li, 2007). Se aplica principalmente en terrenos extensos en donde existe contaminaci&oacute;n superficial. Esta tecnolog&iacute;a tiene como ventajas, sobre otros m&eacute;todos de remedi&oacute;n de suelos, que es de menor costo, f&aacute;cil de aplicar y est&eacute;ticamente agradable. Algunas plantas empleadas con fines de fitoestabilizaci&oacute;n son: <i>Hyparrhenia hirta</i> (Pb); <i>Zygophyllum fabago</i> (Zn); <i>Lupinus albus</i> (Cd, As); <i>Anthyllis vulneraria</i> (Zn, Pb, Cd); <i>Deschampsia cespitosa</i> (Pb, Cd, Zn); <i>Cardaminopsis arenosa</i> (Cd, Zn); <i>Horedeum vulgare, Lupinus angustifolius</i> y <i>S&eacute;cale cereale</i> (As); <i>Lolium italicum</i> y <i>Festuca arundinaceae</i> (Pb, Zn); y <i>Brassica j&uacute;ncea</i> (Cd, Zn, Cu, Mn, Fe, Pb) (Bol&aacute;n <i>et al.,</i> 2003; Clemente <i>et al.,</i> 2003; Rizzi <i>et al.,</i> 2004; Kucharski <i>et al.,</i> 2005 Clemente <i>et al,</i> 2006; Fr&eacute;rot <i>et al,</i> 2006; Mains <i>et al,</i> 2006; V&aacute;zquez <i>et al.,</i> 2006; Conesa <i>et al.,</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">La rizofiltracion utiliza las plantas para eliminar del medio h&iacute;drico contaminantes a trav&eacute;s de la ra&iacute;z (Dushenkov <i>et al,</i> 1995). En la rizofiltracion estas plantas se cultivan de manera hidrop&oacute;nica. Cuando el sistema radicular est&aacute; bien desarrollado, las plantas se introducen en el agua contaminada con metales, en donde las ra&iacute;ces los absorben y acumulan. A medida que las ra&iacute;ces se van saturando, las plantas se cosechan y se disponen para su uso final (Nedelkoska y Doran, 2000; Eapen <i>et al,</i> 2003; Cherian y Oliveira, 2005). Existe una gran cantidad de estudios relacionados con la capacidad de acumulaci&oacute;n de contaminantes de diversas plantas acu&aacute;ticas, algunos ejemplos de ellas son: <i>Scirpus lacustris</i> (Cd, Cu, Pb, Mg, Fe, Se, Cr), <i>Lemna gibba</i> (Pb, As, Cu, Cd, Ni, Cr, Al, Fe, Zn, Mn), <i>Azolla caroliniana</i> (Hg, Cr Sr, Cu, Cd, Zn, Ni, Pb, Au, Pt), <i>Elatine Manda</i> (As), <i>Wolffia papulifera</i> (Cd), <i>Polygonum punctatum</i> (Cu, Cd, Pb, Se, As, Hg, Cr, Mn) y <i>Myriophylhum aquaticum, Ludwigina palustris</i> y <i>Mentha aquatic</i> (Cu, Zn, Mn, Fe, Ni) (Zhao y Duncan, 1998; Boniardi <i>et al,</i> 1999; Fogarty <i>et al,</i> 1999; Antones <i>et al,</i> 2001; Groudeva <i>et al,</i> 2001; Cohen&#45;Shoel <i>et al,</i> 2002; Suseela <i>et al,</i> 2002; Quin y Terry, 2003; Zheng <i>et al,</i> 2003; Bennicelli <i>et al,</i> 2004; Chandra y Kulshreshtha, 2004; Kamal <i>et al,</i> 2004; Maleva <i>et al,</i> 2004; Weis y Weis, 2004; Mkandawire <i>et al,</i> 2005; Vardanyan y Ingole, 2006; Dilek, 2007; Li <i>et al,</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">La fitoextracci&oacute;n o fitoacumulaci&oacute;n consiste en la absorci&oacute;n de metales contaminantes mediante las ra&iacute;ces de las plantas y su acumulaci&oacute;n en tallos y hojas.El primer paso para la aplicaci&oacute;n de esta t&eacute;cnica es la selecci&oacute;n de las especies de planta m&aacute;s adecuada para los metales presentes y las caracter&iacute;sticas del emplazamiento. Una vez completado el desarrollo vegetativo de la planta el siguiente paso es cortarlas y proceder a su incineraci&oacute;n y traslado de las cenizas a un vertedero de seguridad. La fitoacumulaci&oacute;n se puede repetir ilimitadamente hasta que la concentraci&oacute;n remanente de metales en el suelo est&eacute; dentro de los l&iacute;mites considerados como aceptables (Kumar <i>et al,</i> 1995). Algunas plantas empleadas para esta t&eacute;cnica fitocorrectiva son: <i>Thlaspi caerulescens</i> (Cd); <i>Sedum alfredii, Viola baoshanensis</i> y <i>Vertiveria zizanioides</i> (Zn, Cd, Pb); <i>Alyssum m&uacute;rale, Trifolium nigriscens, Psychotria douarrei, Geissois pruinosa, Homalium guillainii, Hybanthus floribundus, Sebertia acuminata, Stackhousia tryonii, Pimelea leptospermoides, Aeollanthus biformifolius</i> y <i>Haumaniastrum robertii</i> (Ni); <i>Brassica j&uacute;ncea, Helianthus annuus, Sesbania drummondii</i> (Pb); <i>Brassica napus</i> (Cu, Pb, Zn); y <i>Pistia stratiotes</i> (Ag. Cd, Cr, Cu, Hg, Ni, Pb, Zn) (Begonia <i>et al,</i> 1998; Reeves, 2003; Schwartz <i>et al,</i> 2003; Wenzel <i>et al,</i> 2003; Odjegba y Fasidi, 2004; Sharma <i>et al,</i> 2004; Boonyapookana <i>et al,</i> 2005; Chandra <i>et al,</i> 2005; Zhuang <i>et al,</i> 2005; Bani <i>et al,</i> 2007; Wu <i>et al,</i> 2007; Zhuange/a/., 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">La fitovolatilizaci&oacute;n se produce a medida que los &aacute;rboles y otras plantas en crecimiento absorben agua junto con contaminantes org&aacute;nicos e inorg&aacute;nicos. Algunos de estos pueden llegar hasta las hojas y evaporarse o volatilizarse en la atm&oacute;sfera (Prasad y Freitas, 2003). Mediante este proceso se han eliminado contaminantes como: compuestos org&aacute;nicos vol&aacute;tiles (benceno, nitrobenceno, tolueno, etilbenceno y <i>m&#45;</i>xileno), As, Se y Hg (Burken y Ma, 2006; Padmavathiamma y Li, 2007). Las plantas <i>Salicornia bigelovii, Brassica j&uacute;ncea, Astragalus bisulcatus</i> y <i>Chara canescens</i> se han empleado para la remediaci&oacute;n de sitios contaminados con Se (Lin <i>et al,</i> 2002; Shrestha <i>et al,</i> 2006) y la <i>Arabidopsis thaliana</i> para el Hg (Oler&iacute;an y Oliveira, 2005).</font></p>  	    <p align="justify"><font face="verdana" size="2">En la fitodegradaci&oacute;n las plantas y los microorganismos asociados a ellas degradan los contaminantes org&aacute;nicos en productos inofensivos, o bien, mineralizarlos hasta CO<sub>2</sub> y H<sub>2</sub>O. En este proceso los contaminantes son metabolizados dentro de los tejidos vegetales y las plantas producen enzimas como la dehalogenasa y la oxigenasa, que ayudan a catalizar la degradaci&oacute;n (Singh y Jain, 2003). La fitodegradaci&oacute;n se ha empleado para la remoci&oacute;n de explosivos como el TNT, hidrocarburos halogenados, Bisfenol A, PAHs y pesticidas organoclorados y organofosforados (Hannink <i>et al,</i> 2001; Chaudhry <i>et al,</i> 2002; Denys <i>et al,</i> 2006; Zhang <i>et al,</i> 2007).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La fitoinmovilizaci&oacute;n provoca la sujeci&oacute;n y reducci&oacute;n de la biodisponibilidad de los contaminantes mediante la producci&oacute;n de compuestos qu&iacute;micos en la interfaz suelo&#45;ra&iacute;z, los que inactivan las substancias t&oacute;xicas, ya sea por procesos de absorci&oacute;n, adsorci&oacute;n o precipitaci&oacute;n (Carpena y Bernal, 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Plantas transg&eacute;nicas y fitorremediaci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los organismos gen&eacute;ticamente modificados (OGM), com&uacute;nmente conocidos como transg&eacute;nicos, juegan un papel importante en diversos &aacute;mbitos de la vida actual. Las plantas transg&eacute;nicas se han dise&ntilde;ado para producir una gran variedad de productos. Una prueba de ello son las plantas comestibles utilizadas como veh&iacute;culos de reparto de medicamentos en lugares donde los f&aacute;rmacos son demasiados costosos o no est&aacute;n disponibles. Por ejemplo, las papas con vacuna antidiarreica o los pl&aacute;tanos y alfalfa con vacuna del c&oacute;lera (Raskin, 1996; Saleh&#45;Lakha y Glick, 2005). Otro uso importante de las plantas GM es para la prevenci&oacute;n y remoci&oacute;n de la contaminaci&oacute;n medioambiental.</font></p>  	    <p align="justify"><font face="verdana" size="2">Prevenci&oacute;n de la contaminaci&oacute;n. Las plantas GM empleadas con este prop&oacute;sito reducen significativamente la cantidad de agroqu&iacute;micos necesarios para los cultivos (Montagu, 2005, Vain, 2006). Un ejemplo de estas plantas es el ma&iacute;z Bt. La denominaci&oacute;n Bt deriva de <i>Bacillus thuringiensis,</i> una bacteria que habita en el suelo y cuyas esporas contienen prote&iacute;nas t&oacute;xicas para ciertos insectos, como el gusano barrenador <i>(Di atrae a saccharalis).</i> El ma&iacute;z Bt se produce al insertar a la planta, el gen <i>cry</i> extra&iacute;do de la bacteria Bt. Este gen codifica para la s&iacute;ntesis de prote&iacute;nas Cry, las cuales se activan en el sistema digestivo del insecto alterando su equilibrio osm&oacute;tico y provocando su par&aacute;lisis, por lo que el insecto deja de alimentarse y muere a los pocos d&iacute;as (Macek <i>et al,</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">El nuevo enfoque para el manejo de plagas se basa en la desarrollo de plantas que producen y emiten feromonas de insectos. Por ejemplo, se ha insertado en las plantas de tabaco, el gen que codifica la acil&#45;CoA&#45;delta<sup>11</sup>&#45;(z)&#45;desaturasa, que es responsable de la producci&oacute;n de feromonas sexuales femeninas en la polilla de la col. Estas plantas se siembran cerca o alrededor de los campos de cultivo alimenticios que requieren protecci&oacute;n y atraen a las polillas del sexo opuesto, con lo que se reduce la efectividad del apareamiento y la disminuci&oacute;n de la poblaci&oacute;n de la polilla. Este enfoque no erradica totalmente la plaga, pero reduce las p&eacute;rdidas de plantas que necesitan ser protegidas (Nesnerova, 2004).</font></p>  	    <p align="justify"><font face="verdana" size="2">Remoci&oacute;n de la contaminaci&oacute;n. Las plantas GM dise&ntilde;adas para este fin, son capaces de metabolizar compuestos org&aacute;nicos (<a href="/img/revistas/tsa/v14n2/a2t4.jpg" target="_blank">Tabla 4</a>) o bien de acumular mayor cantidad de contaminantes inorg&aacute;nicos (<a href="/img/revistas/tsa/v14n2/a2t5.jpg" target="_blank">Tabla 5</a>). Generalmente, la fitorremediaci&oacute;n es una funci&oacute;n conjunta entre la planta y los microorganismos de la riz&oacute;sfera (Rittmann, 2006). Algunas especies de bacterias degradan, de manera selectiva, ciertos compuestos que son t&oacute;xicos para las plantas. Los productos metab&oacute;licos del proceso microbiano son asimilados y convertidos, por las especies vegetales, en compuestos menos t&oacute;xicos. Por lo tanto, las modificaciones gen&eacute;ticas de los microorganismos presentes en la riz&oacute;sfera representan una posibilidad en el mejoramiento de las t&eacute;cnicas fitocorrectivas, adem&aacute;s, la introducci&oacute;n de microorganismos GM asegura que los cambios se limiten a los consorcios bacterianos presentes en la ra&iacute;z y que estos no se encuentren en el suelo circundante (Macek <i>et al,</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">Un ejemplo de ello, es la rizoremediaci&oacute;n, por la <i>Pseudomona fluorescens,</i> de PCB 's. Este proceso se regula mediante un sistema que responde a las se&ntilde;ales de las ra&iacute;ces de la alfalfa (Vi&ntilde;aderos, 2005). Otro enfoque prometedor, involucra el uso de bacterias ed&aacute;ficas GM que son capaces de remediar compuestos org&aacute;nicos vol&aacute;tiles solubles en agua (Barac, 2004). Un ejemplo de ello son las bacterias que degradan el tricloroetileno, las cuales protegen a la planta hu&eacute;sped en contra de su fitotoxicidad y contribuyen a la disminuci&oacute;n de su evapotranspiraci&oacute;n (Macek <i>et al,</i> 2007).</font></p>  	    <p align="justify"><font face="verdana" size="2">La fitoextracci&oacute;n es una soluci&oacute;n para la remoci&oacute;n de contaminantes que no pueden ser degradados. Se deben considerar dos factores importantes para que una planta sea un buen fitoextractor: su biomasa y su eficiencia de bioconcentraci&oacute;n. A pesar de que existen plantas hiperacumuladoras que son buenas candidatas para la fitorremediaci&oacute;n, muchas de ellas poseen poca biomasa, por lo que el uso de la ingenier&iacute;a gen&eacute;tica permite transferir y sobreexpresar los genes de bacterias, levaduras o animales que promueven la hiperacumulaci&oacute;n en ciertas plantas que tienen una gran biomasa.</font></p>  	    <p align="justify"><font face="verdana" size="2">Se han caracterizado y fiincionalizado, a nivel molecular, un gran n&uacute;mero de sistemas de descontaminaci&oacute;n de elementos traza en levaduras y bacterias. La introducci&oacute;n de tales genes en las plantas ha cosechado resultados prometedores (Rugh <i>et ai,</i> 1998; Kramer y Chardonnens, 2001). Un ejemplo de ello, es la sobreexpresion de los genes involucrados en la s&iacute;ntesis de metaloteinas (MT), lo que mejora la capacidad de quelaci&oacute;n o traslocaci&oacute;n de metales (Pilon&#45;Smits, 2005; De la Fuente <i>et al,</i> 1997; Higuchi <i>et ai,</i> 1999). Por ejemplo, la sobreexpresion de genes MT en la planta de tabaco promueve una mayor tolerancia al Cd (Misra y Gedamu, 1989). La sobreexpresion del gen CUPI en la coliflor, promueve la acumulaci&oacute;n de Cd hasta en 16 veces m&aacute;s que en la planta sin modificaci&oacute;n gen&eacute;tica (Hesegawa <i>et ai,</i> 1997). Se ha reportado una mayor acumulaci&oacute;n de Cu en <i>Arabidopsis thaliana</i> por la sobreexpresion del gen MT del ch&iacute;charo (Pan <i>et al,</i> 1994).</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El ejemplo m&aacute;s representativo del uso de las plantas GM con fines de remediaci&oacute;n, es aplicado a la eliminaci&oacute;n de mercurio. El mercurio entra en los cuerpos de agua como consecuencia de actividades industriales como la fabricaci&oacute;n de papel, textiles, productos qu&iacute;micos y como subproducto de la miner&iacute;a. El mercurio al ser l&iacute;quido a temperatura ambiente es f&aacute;cilmente volatilizado, sin embargo, debido a su alta reactividad, existe en el ambiente principalmente como cati&oacute;n divalente Hg<sup>2+</sup>.</font></p>  	    <p align="justify"><font face="verdana" size="2">Con base a lo anterior, se ha propuesto el uso de la reductasa de origen bacteriano, MerA, que cataliza la reducci&oacute;n del ion merc&uacute;rico a mercurio elemental, con el uso de NADPH como donador de electrones. Para garantizar la traducci&oacute;n en las plantas, se sintetiz&oacute; el gen <i>merApe9</i> y se introdujo a la planta <i>Arabidopsis thaliana</i> mediante una transformaci&oacute;n con <i>Agrobacterium tumefaciens.</i> Estudios posteriores demostraron una mejor resistencia en la germinaci&oacute;n y crecimiento en un medio contaminado con HgCl<sub>2</sub> en concentraciones de 25&#45;100 &#956;M (niveles t&oacute;xicos para la mayor&iacute;a de las plantas). El uso de <i>Arabidopsis thaliana</i> modificada gen&eacute;ticamente, sirve como modelo para la reducci&oacute;n de otros metales a trav&eacute;s de procesos enzimaticos que pueden ayudar a remediar metales t&oacute;xicos como Cu, Pby Cr (Raskin, 1996).</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Ventajas y limitaciones de la fitorremediaci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La fitorremediaci&oacute;n, por s&iacute; misma, muestra una serie de ventajas y limitaciones en comparaci&oacute;n con otras tecnolog&iacute;as convencionales, las cuales se presentan en la <a href="/img/revistas/tsa/v14n2/a2t6.jpg" target="_blank">tabla 6</a>. Las fitotecnolog&iacute;as son especialmente &uacute;tiles para su aplicaci&oacute;n en grandes superficies, con contaminantes relativamente inm&oacute;viles o con niveles de contaminaci&oacute;n bajo, y deben considerarse procesos de recuperaci&oacute;n a largo plazo.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>DISCUSI&Oacute;N</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Durante los &uacute;ltimos a&ntilde;os se han desarrollado tecnolog&iacute;as que permiten remediar la contaminaci&oacute;n del ambiente a trav&eacute;s del uso de plantas y sus organismos relacionados. La fitorremediaci&oacute;n es una tecnolog&iacute;a cuyo objetivo principal es la eliminaci&oacute;n de metales t&oacute;xicos y contaminantes org&aacute;nicos (en suelo, aire, agua y sedimentos) que afectan a los seres vivos, sin embargo, es necesario seguir investigando sobre los procesos que determinan la disponibilidad de los contaminantes, su absorci&oacute;n, traslocaci&oacute;n, quelaci&oacute;n, degradaci&oacute;n y volatilizaci&oacute;n en la planta, con el fin de transmitir a la sociedad de manera clara, este conocimiento para su aceptaci&oacute;n y comercializaci&oacute;n. Hasta ahora, la mayor&iacute;a de los trabajos relacionados con la fitocorrecci&oacute;n se han llevado a cabo a escala de laboratorio, con plantas cultivadas en condiciones ideales. Es primordial realizar las gestiones necesarias para aplicar este conocimiento en casos reales que permitan demostrar la eficiencia de esta t&eacute;cnica. Es importante resaltar que los conocimientos hasta el momento adquiridos han contribuido a la mejora de la capacidad de fitorremediaci&oacute;n de un gran n&uacute;mero de plantas. Por ejemplo, las nuevas plantas GM han desarrollado una amplia capacidad de absorci&oacute;n, transporte, acumulaci&oacute;n y degradaci&oacute;n, tanto de contaminantes org&aacute;nicos como inorg&aacute;nicos.</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>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los problemas de contaminaci&oacute;n que existen actualmente requieren de tecnolog&iacute;as costo&#45;efectivas, ambientalmente amigables y que puedan aplicarse a gran escala, tal es el caso de la fitorremediaci&oacute;n. La capacidad de las plantas para absorber, adsorber, metabolizar, acumular, estabilizar o volatilizar contaminantes org&aacute;nicos y/o inorg&aacute;nicos; aunada a las complejas interacciones que establecen con la riz&oacute;sfera, as&iacute; como la generaci&oacute;n de plantas GM, confieren a esta tecnolog&iacute;a importantes ventajas sobre otros m&eacute;todos convencionales de remediaci&oacute;n de la contaminaci&oacute;n. Sin embargo, se requiere m&aacute;s informaci&oacute;n sobre las interacciones planta&#45;microorganismos rizosf&eacute;ricos, sobre los metabol&iacute;tos responsables del fen&oacute;meno de quelaci&oacute;n de metales pesados al interior de la plantas, as&iacute; como del papel que juegan ciertas enzimas en el proceso de fitorremediaci&oacute;n. En la medida en que este conocimiento se incremente, ser&aacute; posible una aplicaci&oacute;n m&aacute;s eficiente y a gran escala de esta tecnolog&iacute;a.</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">Adamia, G., Ghoghoberidze, M, Graves, D., Khatisashvili, G., Kvesitadze, G., Lomidze, E. 2006. Absorption distribution and transformation of TNT in higher plants. 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