<?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>S0187-73802025000300215</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2025.3.215</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Tres ciclos de selección modificada mazorca por surco en maíz Zapalote Chico]]></article-title>
<article-title xml:lang="en"><![CDATA[Three cycles of modified ear-to-row selection in Zapalote Chico corn]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Coutiño-Estrada]]></surname>
<given-names><![CDATA[Bulmaro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Montiel]]></surname>
<given-names><![CDATA[Noel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vidal-Martínez]]></surname>
<given-names><![CDATA[Víctor]]></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  ]]></institution>
<addr-line><![CDATA[Ocozocoautla Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Iguala Guerrero]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Santiago Ixcuintla Nayarit]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2025</year>
</pub-date>
<volume>48</volume>
<numero>3</numero>
<fpage>215</fpage>
<lpage>222</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802025000300215&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802025000300215&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802025000300215&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Muchos productores de maíz (Zea mays L.), de susbsistencia principalmente, cultivan variedades criollas precoces para tener grano en un tiempo más corto y para sembrar dos o tres veces al año; estas variedades nativas de las razas Zapalote Chico y Zapalote Grande se cultivan en 34 comunidades de siete de los 10 Distritos de Desarrollo Rural de Chiapas, México, pero aun no hay variedades mejoradas provenientes de ellas. Por ello se utilizaron seis muestras de productores con el objetivo de iniciar un método de mejoramiento genético y formar una variedad mejorada. El compuesto de maíz utilizado tenía germoplasma de las razas Zapalote Chico, Zapalote Grande y Tuxpeño, por lo que se realizó pre-mejoramiento para depurarlo hacia características de planta y mazorca típicas de Zapalote Chico. Se realizaron tres ciclos de selección modificada mazorca por surco de familias de medios hermanos maternos para uniformizar el tipo de planta, precocidad y mejorar rendimiento de grano. En el ciclo primavera-verano 2024 se evaluaron en una localidad 155 familias, más el ciclo 2 (C2) como testigo, en un diseño experimental látice simple rectangular 13 × 12, en parcelas de un surco de 3 m con 16 plantas, a una densidad de población de 88 mil plantas ha-1. Se midieron las variables días a floración femenina y masculina, altura de planta y de mazorca en cm y se estimó el rendimiento de grano en t ha-1. Se realizó análisis de varianza y prueba de medias con la diferencia honesta significativa. Se encontró significancia para días a floración femenina y masculina y rendimiento de grano, con promedios de 47, 49 días y 3.879 t ha-1, respectivamente. De las familias estadísticamente superiores, fueron seleccionadas las mejores 24 con rendimientos de 5.691 a 4.531 t ha-1, y con semilla remanente de las mismas se sembró un lote de recombinación genética, para volver a seleccionar 155 nuevas familias y continuar el cuarto ciclo de selección.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Many producers of maize (Zea mays L.), mainly of subsistence, grow early landraces to get grain in a shorter time and to plant two or three times a year; these native varieties of the Zapalote Chico and Zapalote Grande landraces are grown in 34 communities in seven of the 10 Rural Development Districts of Chiapas, Mexico, but there are still no improved varieties derived from them. For this reason, six samples from producers were used with the aim of initiating a breeding method and producing an improved variety. The maize composite used had germplasm of the Zapalote Chico, Zapalote Grande and Tuxpeño landraces, thus, pre-breeding was carried out to purify it for plant and ear characteristics typical of Zapalote Chico. Three cycles of modified earto-row maternal half-sib selection were carried out to standardize the type of plant, earliness and improve grain yield. In the 2024 Spring-Summer season, 155 families were evaluated in one locality, plus cycle 2 (C2) as a control, under a 13 × 12 rectangular simple lattice experimental design, in plots of a 3-m single row with 16 plants, at a population density of 88 thousand plants ha-1. Measured variables were days to female and male flowering, plant and ear height in cm, and grain yield in t ha-1. Analysis of variance and a mean test with the significant honest difference were performed. Significance was found for days to female and male flowering and for grain yield, with averages of 47, 49 days, and 3.879 t ha-1, respectively. From the statistically superior families, the best 24 were selected with yields of 5.691 to 4.531 t ha-1, and with remnant seed from them, a plot of genetic recombination was planted, to re-select 155 new half-sib families to continue the fourth selection cycle.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Zea mays]]></kwd>
<kwd lng="es"><![CDATA[maíz precoz]]></kwd>
<kwd lng="es"><![CDATA[selección recurrente]]></kwd>
<kwd lng="es"><![CDATA[variedad Cuarentano]]></kwd>
<kwd lng="en"><![CDATA[Zea mays]]></kwd>
<kwd lng="en"><![CDATA[early maize]]></kwd>
<kwd lng="en"><![CDATA[recurrent selection]]></kwd>
<kwd lng="en"><![CDATA[variety Cuarentano]]></kwd>
</kwd-group>
</article-meta>
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