<?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>2007-0934</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias agrícolas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Cienc. Agríc]]></abbrev-journal-title>
<issn>2007-0934</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-09342015000801769</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Calidad fisiológica de semilla y desarrollo de plántulas de maíz a temperaturas bajas]]></article-title>
<article-title xml:lang="en"><![CDATA[Physiological quality of the seed and maize seedlings development at low temperatures]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gámez-Vázquez]]></surname>
<given-names><![CDATA[Alfredo Josué]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[O-Olán]]></surname>
<given-names><![CDATA[Micaela De la]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avila-Perches]]></surname>
<given-names><![CDATA[Miguel Angel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Virgen-Vargas]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Torres]]></surname>
<given-names><![CDATA[Norma Angélica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gámez-Vázquez]]></surname>
<given-names><![CDATA[Francisco Paul]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ascencio-Álvarez]]></surname>
<given-names><![CDATA[Ada]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,INIFAP Campo Experimental Bajío ]]></institution>
<addr-line><![CDATA[ Guanajuato]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,INIFAP Campo Experimental Valle de México ]]></institution>
<addr-line><![CDATA[Texcoco México]]></addr-line>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Agraria Antonio Narro  ]]></institution>
<addr-line><![CDATA[Saltillo Coahuila]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Tecnológica de la Mixteca  ]]></institution>
<addr-line><![CDATA[Huajuapan de León Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>6</volume>
<numero>8</numero>
<fpage>1769</fpage>
<lpage>1779</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-09342015000801769&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-09342015000801769&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-09342015000801769&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La adaptación del cultivo de maíz a siembras tempranas requiere de mejorar su tolerancia a bajas temperaturas, en términos de capacidad de las semillas para germinar y generar plántulas que prosperen a tales temperaturas. El objetivo del presente trabajo fue identificar las variables que a nivel de semilla y plántula están involucrados en la tolerancia a bajas temperaturas de líneas e híbridos de maíz adaptados a los Valles Altos de México. Se evaluaron en condiciones de laboratorio e invernadero 17 materiales genéticos, incluidos un híbrido del trópico y una variedad sintética de condiciones templadas. Los genotipos se evaluaron en laboratorio en temperaturas de: 4, 8, 12 y 25 °C. Los materiales genéticos originarios de la zona de mayor altitud presentaron mejor tolerancia, altos porcentajes de germinación, peso seco de plúmula y radícula; además de mayor velocidad de emergencia. El peso seco de la radícula fue proporcionalmente menos afectada que la plúmula por bajas temperaturas. La respuesta de tolerancia a bajas temperaturas se indujo en los genotipos susceptibles al reducir de 8 a 4° C la temperatura. Los resultados sugieren que la prueba fría con 8° C durante 7 días previo a la inducción de la germinación puede considerarse como una prueba rápida para detectar tolerancia a bajas temperaturas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The adaptation of maize to early plantings required improving their tolerance to low temperatures, in terms of the ability of the seeds to germinate and produce seedlings at such temperatures. The aim of this study was to identify the variables that seed and seedlings are involved in tolerance to low temperatures of lines and hybrids adapted to the high valleys of Mexico. Were evaluated, in the laboratory and greenhouse 17 genetic materials, including a hybrid of the tropics and a synthetic variety of temperate conditions. Genotypes were evaluated in the laboratory at temperatures of 4, 8, 12 and 25 °C. The genetic materials from the highest elevation area had a better tolerance, high germination rates, plumule dry weight and radicle; besides faster emergence. The dry weight of the radicle was proportionally less affected than the plumule by low temperatures. The response to low temperature tolerance was induced in susceptible genotype s to reduce from 8 to 4 °C temperature. The results suggest that, the cold test with 8 °C for 7 days before the induction germination can be used as a quick test of tolerance to low temperatures.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="es"><![CDATA[germinación]]></kwd>
<kwd lng="es"><![CDATA[peso seco plúmula]]></kwd>
<kwd lng="es"><![CDATA[tolerancia]]></kwd>
<kwd lng="en"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="en"><![CDATA[germination]]></kwd>
<kwd lng="en"><![CDATA[plumule dry weight]]></kwd>
<kwd lng="en"><![CDATA[tolerance]]></kwd>
</kwd-group>
</article-meta>
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