<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-2768</journal-id>
<journal-title><![CDATA[Polibotánica]]></journal-title>
<abbrev-journal-title><![CDATA[Polibotánica]]></abbrev-journal-title>
<issn>1405-2768</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-27682017000100177</article-id>
<article-id pub-id-type="doi">10.18387/polibotanica.43.8</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Análisis de crecimiento y producción vegetal de Leersia hexandra Swartz en el trópico húmedo mexicano en función de petróleo y surfactante]]></article-title>
<article-title xml:lang="en"><![CDATA[Growth analysis and plant production of Leersia hexandra Swartz in tropic wet mexican in fuction on petroleum and surfactant]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Moscoso]]></surname>
<given-names><![CDATA[Magín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivera-Cruz]]></surname>
<given-names><![CDATA[María del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delgadillo-Martínez]]></surname>
<given-names><![CDATA[Julián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lagunes-Espinoza]]></surname>
<given-names><![CDATA[Luz del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[H. Cárdenas Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<numero>43</numero>
<fpage>177</fpage>
<lpage>196</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-27682017000100177&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-27682017000100177&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-27682017000100177&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Leersia hexandra Swartz es una especie forrajera que crece en humedales del trópico en México. Este pasto se estableció en forma natural en sitios contaminados con derrames crónicos de petróleo crudo en el ejido José Narciso Rovirosa, a dos kilómetros al suroeste del Complejo Procesador de Gas La Venta, en Huimanguillo, Tabasco, México. Se desconoce su potencial de adaptación y crecimiento en Gleysol con petróleo fresco y asistido con Tween® 80 (Tw) en el proceso de recuperación ambiental. El objetivo del estudio fue evaluar el efecto de la concentración de hidrocarburos totales del petróleo fresco (HTP &#769;s) y asistido con el surfactante comercial Tw en el crecimiento, pigmentos clorofilianos y producción de materia seca de L. hexandra. Se realizó un experimento en microtúnel con 15 tratamientos basado en cinco concentraciones de HTP &#769;s (mg kg-1 base seca): 693 biogénico, 4 000, 30000, 60 000, 90 000 y tres concentraciones de Tw (%): 0, 2.5 y 5. Las variables evaluadas a los 30, 60, 120 y 180 días después de establecido el experimento (dds) fueron: 1) longitud de estolones (LE), 2) número de plantas jóvenes en el macollo (PJM), y 3) tasa de crecimiento (TCR). Las variables evaluadas al día 180 dds fueron: a) concentración de clorofilas a, b y total (Cla, Clb, Clt), b) materia seca aérea (MSA), de raíz (MSR) y volumen radical (VR). La PJM y TCR en los cuatro tiempos registraron diferencias por efecto del petróleo y Tw. Las PJM, MSR y VR aumentaron a los 180 dds con la mayor concentración de HTP &#769;s y de Tw. El efecto de 90 000 mg kg-1 HTP &#769;s incrementó la TCR,PJM,MSRyVRperoenLE,Clay Clb no existierón diferencias estadísticas. La concentración 5% Tw estimuló la PJM, Clb, MSA. Estos resultados demuestran la habilidad del pasto L. hexandra para aumentar la TCR, mayor cantidad de PJM y un sistema radical más denso en Gleysol con &#8804; 90 000 petróleo fresco y 5% del surfactante Tw. Se recomienda usar 5% de Tween® 80 antes del transplante de L. hexandra para recuperar Gleysoles con &#8804; 90000 mg kg-1 de HTP &#769;s de petróleo fresco en el trópico húmedo mexicano.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Leersia hexandra Swartz is a forage specie that grows in tropical wetlands in Mexico. This grass is established at sites contaminated with chronic crude oil spills in the José Narciso Rovirosa ejido, two kilometers southwest of the La Venta Gas Processing Complex in Huimanguillo, Tabasco, Mexico. Its potential for adaptation and growth in Gleysol with fresh oil and assisted with Tween® 80 (Tw) in the process of environmental recovery is unknown.There is no knowledge on its production and growth potential when growing in Gleysol exposed to fresh crude oil and supplemented with Tween® 80 (Tw) for environmental recovery purposes. The aim of the study was to evaluate the effect of the concentration of total hydrocarbons fresh oil (TPH) and assisted with the commercial surfactant Tw in the growth, chlorophyll pigments and dry matter production of L. hexandra. An experiment was conducted in a microtunnel using 15 treatments based on five concentrations of TPH (mg kg-1 dry basis): 693 biogenic oil, 4000, 30000, 60000, 90000; and three concentrations of Tw (%): 0, 2.5 and 5. The variables evaluated at 30, 60, 120 and 180 days after the establishment of the experiment (dds) were: 1) length of stolons (LE), 2) number of seedlings perc luster (PJM), and 3) growth rate (TCR). The variables evaluated at 180 dds were: a) concentration of chlorophylls a, b and total (Cla, Clb, Clt), b) aerial dry matter (MSA), root dry matter (MSR) and root volume (VR). The PJM and TCR differed between the four times evaluated due to effect of oil and Tw. The PJM, MSR and VR increased at 180 dds with the highest concentration of TPH and Tw. The effect of 90000 mg kg-1 was an increase in TCR TPH, PJM, MSR and VR, but LE, Cla and Clb showed no statistical differences. A concentration of 5% of Tw stimulated the PJM, Clb, MSA, MSR and VR. These results demonstrate the ability of L. hexandra to increase its TCR, PJM and root system when growing in Gleysol with &#8804; 90000 mg kg-1 of fresh oil and Tw (5%). We recommend using Tween-80 at 5% before transplanting L. hexandra for the environmental recovering of Gleysols contaminated with &#8804; 90000 mg kg-1 of TPH in the Mexican humid tropics.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[pasto]]></kwd>
<kwd lng="es"><![CDATA[petróleo]]></kwd>
<kwd lng="es"><![CDATA[surfactante]]></kwd>
<kwd lng="es"><![CDATA[tasa de crecimiento]]></kwd>
<kwd lng="en"><![CDATA[petroleum]]></kwd>
<kwd lng="en"><![CDATA[surfactant]]></kwd>
<kwd lng="en"><![CDATA[relative growth rate]]></kwd>
<kwd lng="en"><![CDATA[grass]]></kwd>
</kwd-group>
</article-meta>
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