<?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>0188-8897</journal-id>
<journal-title><![CDATA[Hidrobiológica]]></journal-title>
<abbrev-journal-title><![CDATA[Hidrobiológica]]></abbrev-journal-title>
<issn>0188-8897</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-88972016000100008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estrés a microescala de Vallisneria americana por enriquecimiento de nutrientes con estequiometría N:P]]></article-title>
<article-title xml:lang="en"><![CDATA[Stress to microscale of Vallisneria americana by enrichment of nutrients with stoichiometry N:P]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bautista-Regil]]></surname>
<given-names><![CDATA[Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Carrera]]></surname>
<given-names><![CDATA[Violeta]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[Alberto J]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salcedo-Meza]]></surname>
<given-names><![CDATA[Miguel Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Florido]]></surname>
<given-names><![CDATA[Rosa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Juárez Autónoma de Tabasco División Académica de Ciencias Biológicas Centro de Investigación para la Conservación y Aprovechamiento de Recursos Tropicales]]></institution>
<addr-line><![CDATA[Villahermosa Tabasco]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2016</year>
</pub-date>
<volume>26</volume>
<numero>1</numero>
<fpage>53</fpage>
<lpage>60</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972016000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972016000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972016000100008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: El estrés de Vallisneria americana provocado por incrementos de la relación molar N:P (N-NO3 y P-H2PO4) o por el aumento de la concentración de nutrientes (CN) fue diferenciado mediante el análisis del régimen nutricional (RN), el cual fue examinado con dos experimentos factoriales al azar sobre plantas cultivadas in vitro en medio MS modificado. El primero (RN1) cruzó relaciones N:P de 16, 20 y 24 y CN (%) de 25, 50 y 100; mientras que, el segundo (RN2) evaluó las relaciones N:P de 48, 60, 72 y porcentajes de CN de 3.125, 6.25, 12.5, 25 y 50. El mecanismo de estrés por factor fue analizado con la declinación en regeneración y viabilidad de hojas y raíces, porcentual o unitaria, durante 45 o 75 días, ya que las plantas in vitro no produjeron rametos. En los experimentos RN1, todas las plantas murieron en 100% CN, las hojas reportaron mayor resistencia con 24N:P y 25% CN (p&lt;0.05). Las algas crecieron en el 52% de los cultivos, sin efecto de covarianza (p&gt;0.05). En los RN2, hojas y raíces resistieron en 72N:P dentro del rango porcentual de 6.25 a 25 de CN (p&lt;0.05). Otra información útil fue la correlación significativa (p&lt;0.01) entre hojas y raíces regeneradas (r=0.9) y entre regeneración y viabilidad de hojas (r=0.5). El mecanismo de estrés por la relación N:P fue descifrado mediante estequiometría metabólica (proteína:ARN). En contraste, el mecanismo por la CN fue osmótico y rápido. A microescala in vitro, la resistencia al estrés de V. americana, en N:P elevada y con el suministro de N oxidado, fue vinculado a cargas bajas de nutrientes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: To distinguish between the stress of Vallisneria americana caused by increases either in the molar N:P relation (N-NO3 and P-H2PO4) or in the concentration of nutrients (CN), the nutritional regimen (NR) was examined by means of two randomized factorial experiments on plants cultured in vitro in modified MS medium. The first (RN1) crossed N:P relation of 16, 20, and 24 and CN (%) of 25, 50, and 100; while the second (RN2) evaluated N:P relations of 48, 60, 72, and CN percentages of 3.125, 6.25, 12.5, 25, and 50. The mechanism of resistance to the stress by factor was examined with the decrease in the regeneration and viability of leaves and roots; both measured by unit or percentage for 45 to 75 days, since the plants in vitro did not produce ramets. In NR1 experiments, all plants died in 100% CN and leaves registered greater resistance with 24N:P, and 25% CN (p&lt;0.05). The algae grew in 52% of the cultures, without covariance effect (p&gt;0.05). In RN2 experiments, leaves and roots resisted at 72N:P, within the percent ranging from 6.25 to 25 CN (p&lt;0.05). Additional useful information was the significant relationship (p&lt;0.01) found between regenerated leaves and roots (r=0.9), and between regeneration and viability of leaves (r=0.5). The mechanism of stress by the N: P was deciphered by metabolic stoichiometry (protein: RNA). In contrast, the mechanism for the CN was osmotic and fast. At in vitro microscale, resistance to the stress of V. americana, in high N:P and with the supply of N-oxidized, was linked to low nutrient loads.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Carga de nutrientes]]></kwd>
<kwd lng="es"><![CDATA[cultivo in vitro]]></kwd>
<kwd lng="es"><![CDATA[estequiometría N:P]]></kwd>
<kwd lng="es"><![CDATA[resistencia al estrés]]></kwd>
<kwd lng="es"><![CDATA[Vallisneria americana]]></kwd>
<kwd lng="en"><![CDATA[In vitro culture]]></kwd>
<kwd lng="en"><![CDATA[loading nutrients]]></kwd>
<kwd lng="en"><![CDATA[resistance to stress]]></kwd>
<kwd lng="en"><![CDATA[stoichiometry N:P]]></kwd>
<kwd lng="en"><![CDATA[Vallisneria americana]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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<person-group person-group-type="author">
<name>
<surname><![CDATA[Zhu]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Yuan]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Wei]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Xie]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<source><![CDATA[CLEAN-Soil, Air, Water]]></source>
<year>2014</year>
<volume>42</volume>
<numero>9999</numero>
<issue>9999</issue>
<page-range>1-7</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
