<?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>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802021000400561</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2021.4.561</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Humic acids effects on plant growth and protection against water stress in selected native maize populations from Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Efecto de ácidos húmicos en el crecimiento vegetal y la protección contra el estrés hídrico en poblaciones selectas de maíz nativo de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Campos]]></surname>
<given-names><![CDATA[Reinier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Robles]]></surname>
<given-names><![CDATA[Celerino]]></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-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional ]]></institution>
<addr-line><![CDATA[Santa Cruz Xoxocotlán Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Federal Rural University of Rio de Janeiro Soils Department ]]></institution>
<addr-line><![CDATA[Rio de Janeiro ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>44</volume>
<numero>4</numero>
<fpage>561</fpage>
<lpage>569</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802021000400561&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802021000400561&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802021000400561&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Humic substances stimulate the growth and development of plants, inducing oxidative regulation at the cellular level in their interaction with the root surface. This promotes a state of &#8220;eustress&#8221; that results in root growth and protection of plants against abiotic stress. This study aimed to evaluate the effect of the application of humic acids (HA) in the germination and vegetative phases, with and without water stress induced by withholding irrigation, in native selected maize populations (Zea mays L.) from regions with drought incidence in Oaxaca. The soil used had a neutral pH value, sandy loam texture and low organic matter content. Initially, HA delayed germination of maize seeds; subsequently, stimulation was recorded at the highest concentrations. The Cuilapam population showed the best response to HA application in this phase. In V7 vegetative phase, HA stimulated plant growth, promoting higher values &#8203;&#8203;in plant height, number of roots and production of root and shoot biomass, and attenuated the effect of water deficit in the three maize populations. The magnitude of the response was a function of the maize population and the concentration of HA applied. The application of HA decreased the adverse effects caused by the induced wter stress by enhancing growth parameters and protein synthesis in the three maize populations.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las sustancias húmicas estimulan el crecimiento y desarrollo de las plantas, induciendo la regulación oxidativa a nivel celular en su interacción con la superficie radical. Esto promueve un estado de &#8220;eustrés&#8221; que resulta en un crecimiento radical y protección de las plantas contra el estrés abiótico. El objetivo de este estudio fue evaluar el efecto de la aplicación de ácidos húmicos (HA) en las fases de germinación y vegetativa, con y sin estrés hídrico inducido por suspensión de riego, en poblaciones seleccionadas nativas de maíz (Zea mays L.) de regiones con incidencia de sequía en Oaxaca. El suelo utilizado tuvo un valor de pH neutro, textura franco arenosa y bajo contenido de materia orgánica. Los HA inicialmente retrasaron la germinación de las semillas de maíz; posteriormente, se registró una estimulación en las concentraciones más altas. La población Cuilapam mostró la mejor respuesta a la aplicación de HA en esta fase. En la fase vegetativa V7, los HA estimularon el crecimiento de las plantas, promoviendo valores más altos en altura de planta, número de raíces y producción de biomasa de raíces y brotes, y atenuaron el efecto del déficit hídrico en las tres poblaciones de maíz. La magnitud de la respuesta estuvo en función de la población de maíz y la concentración de HA aplicada. La aplicación de HA disminuyó los efectos adversos provocados por el estrés hídrico inducido al promover parámetros de crecimiento y contenido total de proteínas en las tres poblaciones de maíz.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Zea mays]]></kwd>
<kwd lng="en"><![CDATA[eustress]]></kwd>
<kwd lng="en"><![CDATA[germination]]></kwd>
<kwd lng="en"><![CDATA[humic substances]]></kwd>
<kwd lng="en"><![CDATA[water stress]]></kwd>
<kwd lng="es"><![CDATA[Zea mays]]></kwd>
<kwd lng="es"><![CDATA[estrés hídrico]]></kwd>
<kwd lng="es"><![CDATA[eustrés]]></kwd>
<kwd lng="es"><![CDATA[germinación]]></kwd>
<kwd lng="es"><![CDATA[sustancias húmicas]]></kwd>
</kwd-group>
</article-meta>
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