<?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>S0187-73802022000100003</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2022.1.3</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variedades compuestas, una opción de aprovechamiento de la diversidad de las poblaciones nativas de maíz]]></article-title>
<article-title xml:lang="en"><![CDATA[Composite varieties, an option for using the diversity of maize landraces]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carmen-Bravo]]></surname>
<given-names><![CDATA[Gonzalo Del]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gil-Muñoz]]></surname>
<given-names><![CDATA[Abel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López]]></surname>
<given-names><![CDATA[Pedro Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Reyes-López]]></surname>
<given-names><![CDATA[Delfino]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ocampo-Fletes]]></surname>
<given-names><![CDATA[Ignacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Santiago Momoxpan Puebla]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Facultad en Ciencias Agrícolas y Pecuarias ]]></institution>
<addr-line><![CDATA[ Puebla]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2022</year>
</pub-date>
<volume>45</volume>
<numero>1</numero>
<fpage>3</fpage>
<lpage>12</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802022000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802022000100003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802022000100003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las poblaciones nativas de maíz (Zea mays L.) han sido fuentes muy valiosas de genes para los programas de fitomejoramiento, pero los esfuerzos orientados a su mejoramiento en las microrregiones donde se originaron han sido escasos. Una propuesta es la formación de variedades compuestas; sin embargo, no existen estudios que documenten su potencial, especialmente cuando el material base son poblaciones nativas sobresalientes. Por lo anterior, los objetivos de esta investigación fueron evaluar el comportamiento agronómico y rendimiento de grano de tres variedades compuestas con respecto a sus progenitores y testigos comerciales y, a partir de ello, valorar la viabilidad de este tipo de materiales. Se diseñaron tres experimentos, uno con variedades de grano blanco, otro de grano amarillo y otro de grano azul. Cada uno incluyó tres ciclos de recombinación de la variedad compuesta correspondiente, las poblaciones nativas progenitoras y al menos dos testigos. Los materiales en cada experimento se evaluaron bajo un diseño de bloques completos al azar con tres repeticiones, en tres localidades de la microrregión de procedencia de las poblaciones progenitoras. Se registraron días a floración femenina, altura de mazorca, porcentajes de acame de tallo y de raíz, rendimiento de grano y varios de sus componentes. Se aplicó un análisis de varianza combinado a través de localidades y prueba de medias. Las variedades compuestas mantuvieron y conjuntaron atributos favorables de las poblaciones progenitoras y las superaron en rendimiento, con ganancias de entre 1.8 y 10.6% (promedio de los ciclos de recombinación) y mostraron una menor afectación de la producción de grano a través de ambientes; adicionalmente, las variedades compuestas igualaron o superaron en rendimiento a los testigos. Se concluye que la formación de variedades compuestas a partir de poblaciones nativas sobresalientes representa una opción adecuada de aprovechamiento de los maíces nativos en programas de fitomejoramiento microrregional.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY Maize (Zea mays L.) landraces have been very valuable sources of genes for breeding programs; nevertheless, efforts aimed at their improvement in the microregions where they originated have been scarce. One proposal is the formation of composite varieties; however, there are no studies documenting their potential, especially when the base material consists of outstanding landraces. Thus, the objectives of this study were to evaluate the agronomic performance and grain yield of three composite varieties compared to their parents and commercial controls and based on that, to assess the viability of this type of material. Three experiments were designed, one with white grain varieties, other with yellow grain varieties and another with blue grain varieties, each included three recombination cycles of the corresponding composite variety, the parental landraces and at least two controls. Materials of each experiment were evaluated under a randomized complete block design with three replications in three localities of the microregion of origin of the landraces. Days to silking, ear height, stalk and root lodging percentages, grain yield and several of their components were recorded. Combined analysis of variance across localities and mean comparison test were applied. Composite varieties maintained and combined favorable traits of the parent populations and surpassed them in yield, with gains between 1.8 and 10.6% (average across recombination cycles), and showed less affectation in grain yield across environments; in addition, composite varieties equaled or exceeded the yields of the controls. It is concluded that the formation of composite varieties from outstanding landraces represents an adequate option for landrace utilization in microregional breeding programs.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="es"><![CDATA[comportamiento agronómico]]></kwd>
<kwd lng="es"><![CDATA[compuesto varietal]]></kwd>
<kwd lng="es"><![CDATA[poblaciones nativas]]></kwd>
<kwd lng="en"><![CDATA[Zea mays L.]]></kwd>
<kwd lng="en"><![CDATA[agronomic performance]]></kwd>
<kwd lng="en"><![CDATA[composite population]]></kwd>
<kwd lng="en"><![CDATA[landraces]]></kwd>
</kwd-group>
</article-meta>
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