<?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>2071-0054</journal-id>
<journal-title><![CDATA[Revista Ciencias Técnicas Agropecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cie Téc Agr]]></abbrev-journal-title>
<issn>2071-0054</issn>
<publisher>
<publisher-name><![CDATA[Universidad Agraria de La Habana]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2071-00542020000200053</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Plasma Membrane Alterations in Phaseolus vulgaris L. Variety CC-25-9-N Induced by Metals]]></article-title>
<article-title xml:lang="es"><![CDATA[Alteraciones en la membrana plasmática de Phaseolus vulgaris L. variedad CC-25-9-N inducida por metales]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Portuondo Farías]]></surname>
<given-names><![CDATA[Liane]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Balmori]]></surname>
<given-names><![CDATA[Dariellys]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guridi Izquierdo]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Falcón Rodríguez]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calderín García]]></surname>
<given-names><![CDATA[Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Machado Torres]]></surname>
<given-names><![CDATA[João Paulo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Agraria de La Habana  Departamento de Química]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Ciencias Agrícolas  ]]></institution>
<addr-line><![CDATA[San José de las Lajas Mayabeque]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidade Federal Rural do Rio de Janeiro Laboratório de Solos ]]></institution>
<addr-line><![CDATA[ Rio de Janeiro]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidade Federal do Rio de Janeiro Laboratório de Radioisótopos ]]></institution>
<addr-line><![CDATA[ Rio de Janeiro]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2020</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>53</fpage>
<lpage>63</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2071-00542020000200053&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2071-00542020000200053&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2071-00542020000200053&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT It is in the early stages of the vegetative phase, when the plant manifests its greatest susceptibility to sudden changes in environmental conditions and unleashes adaptive pathways that include changes in the structure of cell membranes, as they are the first to respond to damage. The bean (Phaseolus vulgaris L.) is a crop of agricultural interest that can accumulate heavy metals and therefore, the possibility of developing mechanisms of tolerance to this type of stress. For these reasons, the work aimed to determine the existence of changes in the plasma membrane and in the antioxidant activity of leaves in bean plants germinated in presence of heavy metals. Seeds of the variety CC-25-9-N were germinated under controlled conditions with six specific concentrations of Pb2+, Ni2+ and Cu2+ cations. Fifteen days after seed´s germination, the tolerance limit, the lethal dose and changes in the permeability of the leaf membranes were determined through electrical conductivity, pH and the activity of total peroxidases and guaiacol peroxidase. The variability in the membrane permeability was checked from differences in the values of the electrical conductivity and the pH in each of the treatments, which depended on the metal and the concentration under study, as well as on the activity of the enzymes analyzed. These results suggest a possible specificity in the plant - metal interaction that implicate different response mechanisms.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En las primeras etapas de la fase vegetativa es donde la planta manifiesta su mayor susceptibilidad a cambios bruscos en las condiciones del medio, desatándose vías adaptativas que incluyen cambios en la estructura de las membranas celulares, por ser las primeras que responden a un daño. El frijol (Phaseolus vulgaris L.) es un cultivo de interés agrícola que puede acumular metales pesados y, por consiguiente, desarrollar mecanismos de tolerancia a este tipo de estrés. Por estas razones el trabajo tuvo como objetivo determinar la existencia de cambios en la membrana plasmática y en la actividad antioxidante de hojas de plantas de frijol germinadas en presencia de metales pesados. Semillas de la variedad CC-25-9-N fueron germinadas en condiciones controladas en presencia de seis concentraciones específicas para los cationes Pb2+, Ni2+ y Cu2+. A los 15 días después de la germinación se determinó el límite de tolerancia, la dosis letal media, cambios en la permeabilidad de las membranas de las hojas a través de medidas de conductividad eléctrica y pH, y la actividad de peroxidasas totales y guaiacol peroxidasa. Fue comprobada la variabilidad en la permeabilidad de la membrana a partir de diferencias en los valores de la conductividad eléctrica y el pH en cada uno de los tratamientos, que dependieron del metal y la concentración en estudio, así como también en la actividad de las enzimas analizadas. Los resultados sugieren una posible especificidad en la interacción planta-metal, lo que implica mecanismos de respuestas diferentes.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[beans]]></kwd>
<kwd lng="en"><![CDATA[toxic metals]]></kwd>
<kwd lng="en"><![CDATA[oxidative stress]]></kwd>
<kwd lng="en"><![CDATA[toxicity]]></kwd>
<kwd lng="en"><![CDATA[peroxidases]]></kwd>
<kwd lng="es"><![CDATA[frijol]]></kwd>
<kwd lng="es"><![CDATA[metales tóxicos]]></kwd>
<kwd lng="es"><![CDATA[estrés oxidativo]]></kwd>
<kwd lng="es"><![CDATA[toxicidad]]></kwd>
<kwd lng="es"><![CDATA[peroxidasas]]></kwd>
</kwd-group>
</article-meta>
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