<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952016000100043</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Desespigamiento en cruzas simples progenitoras de híbridos de maíz (Zea Mays L.) para valles altos de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Detasseling in parental single crosses of maize (Zea Mays L.) hybrids for high valleys of Mexico]]></article-title>
</title-group>
<contrib-group>
<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[Zepeda-Bautista]]></surname>
<given-names><![CDATA[Rosalba]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avila-Perches]]></surname>
<given-names><![CDATA[M. Angel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Martínez]]></surname>
<given-names><![CDATA[Israel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinosa-Calderón]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gámez-Vázquez]]></surname>
<given-names><![CDATA[A. Josué]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Campo Experimental Valle de México ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Politécnico Nacional Escuela Superior de Ingeniería Mecánica y Eléctrica Zacatenco Sección de Posgrado e Investigación]]></institution>
<addr-line><![CDATA[Colonia Lindavista México, D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Campo Experimental Bajío ]]></institution>
<addr-line><![CDATA[Celaya Guanajuato]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Sitio Experimental Tlaxcala ]]></institution>
<addr-line><![CDATA[ Tlaxcala]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2016</year>
</pub-date>
<volume>50</volume>
<numero>1</numero>
<fpage>43</fpage>
<lpage>59</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952016000100043&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952016000100043&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952016000100043&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La semilla de calidad buena es insumo básico para aumentar productividad en maíz (Zea mays L.), debe producirse con procedimientos y controles estrictos. La tecnología para producir semilla híbrida es limitada; por ello, se evaluó el efecto de eliminar la espiga del progenitor hembra (desespigamiento) sobre la productividad y la calidad de semilla y la interacción con el ambiente de cruzas simples progenitoras de híbridos para Valles Altos de México. Entre 2006 y 2008, en Texcoco, Estado de México (2250 msnm) se evaluaron 15 tratamientos: cinco cruzas simples (CML-239xCML-242, M43xM-44, M-47xM-46, CML-241xCML-243 y M-55xM-54) y tres niveles de desespigamiento (eliminación de la espiga, la espiga más la hoja bandera y sin eliminación de la espiga) en un diseño de bloques completos al azar con tres repeticiones. Diferencias (p&#8804;0.01) se encontraron entre cruzas simples, años, rendimiento y calidad física de semilla; no existió diferencia significativa para desespigamiento: y la interacción entre inicio de floración masculina y femenina sí fue significativa. Las cruzas promediaron entre 70 y 72 d para el inicio de la floración masculina y femenina, con sincronía floral y dos días para iniciar el desespigue y evitar autofecundaciones; rindieron entre 4.79 y 9.43 t ha-1, semilla grande entre 32 y 78 % y peso hectolítrico entre 62 y 68 kg hL-1. Al eliminar la espiga aumentó 6.31 % el rendimiento y disminuyó la semilla chica (10.5 %) en comparación con el testigo. En 2006 hubo 4 d de diferencia para el inicio de la floración femenina y 2 d en 2008 en comparación con 2007; en 2008 el rendimiento fue 9.4 t ha-1 y en 2006 fue 44.68 % menor. En 2008, M43xM-44 rindió 11.24 t ha-1 y en 2006 y 2007 los rendimientos fueron 42.32 y 14.11 % menores. Para determinar dónde, cuándo y cómo producir semilla híbrida se debe conocer los progenitores, sitio de producción e interacción.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Good quality seed is a crucial input for the increase of maize productivity (Zea mays L.), and must be produced using strict procedures and controls. Technology for the production of hybrid seed is limited and, therefore, the effect of removing the tassel of the female parent (detasseling) was evaluated on seed productivity and quality and the interaction with the environment of simple cross females in hybrids for the High Valleys OF Mexico. Between 2006 and 2008 in Texcoco, Estado de México (2250 masl), 15 treatments were evaluated: five simple crosses (CML-239xCML-242, M-43xM-44, M-47xM-46, CML-241xCML-243, and M-55xM-54) and three levels of detasseling (removing tassel, tassel and flag leaf and tassel not removed) in a randomized complete block design with three repetitions. Differences (p&#8804;0.01) were found between simple crosses and years, yield and physical quality of seed; there were no significant differences for detasseling. The interaction was significant for the beginning of male flowering and yield. Crosses averaged 70 to 72 d for the start of male and female flowering, with floral synchrony, and two days to begin detasseling and avoid self-pollination; yields were 4.79 to 9.43 t ha-1, 32 to 78 % for large seeds, and 62 to 68 kg hL-1 test weight. Removing the tassel increased yield by 6.31 % and reduced the amount of small seed by 10.5 % in comparison to the control. In 2006 there was a difference of 4 d for the start of female flowering and 2 din 2008 in comparison with 2007; in 2008 yield was 9.4 t ha-1, and in 2006 it was 44.68 % lower. In 2008, M-43xM-44 yielded 11.24 t ha-1, and in 2006 and 2007, yields were 42.32 and 14.11 % lower. To determine where, when, and how to produce hybrid seeds, one must know the parents, place of production, and interaction.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="es"><![CDATA[semilla]]></kwd>
<kwd lng="es"><![CDATA[desespigamiento]]></kwd>
<kwd lng="es"><![CDATA[interacción genotipo x ambiente]]></kwd>
<kwd lng="es"><![CDATA[progenitores]]></kwd>
<kwd lng="en"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="en"><![CDATA[seed]]></kwd>
<kwd lng="en"><![CDATA[detasseling]]></kwd>
<kwd lng="en"><![CDATA[Genotype x Environment Interaction]]></kwd>
<kwd lng="en"><![CDATA[parents]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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