<?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>S0187-73802019000400367</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[RENDIMIENTO, COMPONENTES DE RENDIMIENTO Y HETEROSIS DE GERMOPLASMA DE MAÍZ ADAPTADO A VALLES ALTOS]]></article-title>
<article-title xml:lang="en"><![CDATA[YIELD, YIELD COMPONENTS AND HETEROSIS OF MAIZE GERMPLASM ADAPTED TO HIGHLANDS]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velasco-García]]></surname>
<given-names><![CDATA[Ángela M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Zavala]]></surname>
<given-names><![CDATA[J. Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sahagún-Castellanos]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lobato-Ortiz]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Abarca]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marín-Montes]]></surname>
<given-names><![CDATA[Iván M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Postgrado de Recursos Genéticos y Productividad-Genética ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Postgrado de Recursos Genéticos y Productividad-Genética ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Fitotecnia ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Colegio de Postgraduados Postgrado de Recursos Genéticos y Productividad-Genética ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Universidad Autónoma Chapingo Departamento de Fitotecnia ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Colegio de Postgraduados Postgrado de Recursos Genéticos y Productividad-Genética ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>42</volume>
<numero>4</numero>
<fpage>367</fpage>
<lpage>374</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802019000400367&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802019000400367&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802019000400367&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las variedades de maíz (Zea mays L.) introducidas de otras latitudes son una fuente de alelos favorables de utilidad en el mejoramiento genético, pero antes de ser empleados deben adaptarse a las condiciones climáticas de los ambientes de interés. El objetivo del presente estudio fue evaluar el rendimiento y sus componentes en poblaciones representativas de razas de maíz originarias del trópico y subtrópico adaptadas por selección masal recurrente a los Valles Altos de México, así como la heterosis de sus cruzas interraciales para identificar genotipos útiles al mejoramiento genético del maíz para esos ambientes. Se evaluaron nueve poblaciones de maíz adaptado, ocho cruzas de dos poblaciones, una cruza de tres poblaciones, generaciones avanzadas de las cruzas y cuatro testigos comerciales. Los genotipos se evaluaron en tres ambientes bajo un diseño experimental de bloques completos al azar con tres repeticiones. Se registró el rendimiento y sus componentes. Se realizó análisis de varianza, comparación de medias (Tukey, P &#8804; 0.05), análisis de correlación y se estimó la heterosis con respecto al progenitor medio. Hubo diferencias significativas (P &#8804; 0.01) entre genotipos para todos los caracteres; los materiales adaptados rindieron de 3.89 a 11.71 t ha-1 y los testigos de 8.06 a 11.56 t ha-1. El rendimiento correlacionó con el índice de prolificidad (r = 0.67), longitud (r = 0.64), diámetro de mazorca (r = 0.65) y número de granos por hilera (r = 0.64). La heterosis promedio para rendimiento y sus componentes fluctuó de -5.30 a 6.53 %, con 5.68 % para rendimiento, donde la cruza F1 P9 × P8 presentó la mayor heterosis (26.19 %). Las poblaciones adaptadas y sus cruzas presentaron rendimientos similares a los testigos comerciales; por esto, pueden aprovecharse per se o como participantes para mejoramiento genético del maíz local de Valles Altos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Varieties of maize (Zea mays L.) introduced from other latitudes are a source of favorable alleles useful in plant breeding, but before being used they must be adapted to the climatic conditions of the target environments. The objective of this study was to evaluate the yield and its components in representative populations of tropical and subtropical maize races adapted by recurrent mass selection to the Mexican highlands, as well as the heterosis of their interracial crosses to identify genotypes useful for maize breeding in those environments. Nine adapted maize populations, eight crosses of two populations, one cross of three populations, advanced generations of the crosses and four commercial checks were evaluated. Genotypes were tested in three environments under a randomized complete blocks design with three replications. Grain yield and its components were recorded. Analysis of variance, comparison of means (Tukey, P &#8804; 0.05), correlation analysis were performed and the heterosis was estimated in relation to the mid- parent. There were significant differences (P &#8804; 0.01) between genotypes for all the traits; the adapted materials yielded from 3.89 to 11.71 t ha-1 and the checks from 8.06 to 11.56 t ha-1. The yield correlated with the prolificacy index (r = 0.67), ear length (r = 0.64), ear diameter (r = 0.65) and number of grains per row (r = 0.64). The average heterosis for yield and its components ranged from -5.30 to 6.53 %, with 5.68 % for yield, where the F1 P9 × P8 cross showed the highest heterosis (26.19 %). Adapted populations and their crosses showed a performance similar to that of commercial checks; thus, they can be used by themselves or as participants for breeding local maize of highlands.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Zea mays]]></kwd>
<kwd lng="es"><![CDATA[germoplasma adaptado]]></kwd>
<kwd lng="es"><![CDATA[rendimiento]]></kwd>
<kwd lng="es"><![CDATA[componentes de rendimiento]]></kwd>
<kwd lng="es"><![CDATA[heterosis]]></kwd>
<kwd lng="en"><![CDATA[Zea mays]]></kwd>
<kwd lng="en"><![CDATA[adapted germplasm]]></kwd>
<kwd lng="en"><![CDATA[yield]]></kwd>
<kwd lng="en"><![CDATA[yield components]]></kwd>
<kwd lng="en"><![CDATA[heterosis]]></kwd>
</kwd-group>
</article-meta>
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