<?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>1659-1321</journal-id>
<journal-title><![CDATA[Agronomía Mesoamericana]]></journal-title>
<abbrev-journal-title><![CDATA[Agron. Mesoam]]></abbrev-journal-title>
<issn>1659-1321</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1659-13212019000100017</article-id>
<article-id pub-id-type="doi">10.15517/am.v30i1.34198</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Polietilenglicol 8000 para identificar maíz tolerante al estrés hídrico durante la germinación]]></article-title>
<article-title xml:lang="en"><![CDATA[Polyethylene glicol 8000 to identify corn tolerant to water stress during germination]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rangel-Fajardo]]></surname>
<given-names><![CDATA[María Alma]]></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[Tucuch-Haas]]></surname>
<given-names><![CDATA[Jorge Ismael]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Basto-Barbudo]]></surname>
<given-names><![CDATA[Dianelly de la Cruz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villalobos-González]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Burgos-Díaz]]></surname>
<given-names><![CDATA[Johnny Abraham]]></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 (INIFAP)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Tecnológico de Conkal  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias (INIFAP)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (INIFAP)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<volume>30</volume>
<numero>1</numero>
<fpage>255</fpage>
<lpage>266</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S1659-13212019000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S1659-13212019000100017&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S1659-13212019000100017&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Introducción. La disponibilidad de agua para la producción agrícola es esencial. La producción de maíz, sujeta al periodo de lluvias, en México supera el 70%. En las regiones agrícolas de la península de Yucatán se reportan producciones en condiciones de bajas precipitaciones o muy erráticas, que pueden provocar pérdidas totales. Una condición crítica para el establecimiento de un cultivo es contar con la humedad necesaria que permita la germinación. Objetivo. El objetivo del presente trabajo fue evaluar materiales de maíz bajo condiciones de estrés hídrico simulado por medio de soluciones osmóticas con la finalidad de identificar los que toleren estas condiciones. Materiales y métodos. El estudio se llevó a cabo en el Campo Experimental Mocochá del Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, durante el 2017; abarcó la fase de germinación y establecimiento. Se emplearon veinticinco materiales de maíz bajo un diseño completamente al azar con arreglo factorial. Se realizó una prueba de germinación bajo dos condiciones de estrés simulado por medio de PEG 8000 (-0,5 y -0,75 MPa), además se empleó un testigo (0 MPa). Se realizaron cuatro repeticiones de veinticinco semillas cada una. Las semillas se expusieron por 24 h al PEG 8000, posteriormente, se hicieron riegos con agua destilada. Se realizaron conteos de las semillas germinadas al séptimo día y se reportó como porcentaje de germinación. En una muestra de diez plántulas de cada repetición, se midió la longitud y el peso, por separado, de la parte aérea y la raíz. Resultados. De los materiales evaluados los híbridos H-563, H-565 y H-568 soportaron estrés de -0,5 MPa, y el H-520, H-567 y HEV3B presentaron germinación con -0,75 MPa y resaltaron en todas las variables evaluadas. Conclusión. Es posible identificar materiales que toleraran las condiciones de estrés durante la etapa de germinación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction. The availability of water for agricultural production is essential. The production of corn, subject to the rainy season, in Mexico exceeds 70%. In the agricultural regions of the Yucatan, productions are reported in conditions of low rainfall or very erratic precipitation, which can cause total losses. A critical condition for the establishment of a crop is to have the necessary humidity that allows germination. Objective. The aim of the present work was to evaluate maize materials under simulated water stress conditions through osmotic solutions in order to identify those that can tolerate these conditions. Materials and methods. The study was carried out in the Campo Experimental Mococha of the Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, during 2017; including the germination and establishment phase. Twenty-five maize materials were used under a completely random design with a factorial arrangement. A germination test was performed under simulated two stress conditions by means of the PEG 8000 (-0.50 and -0,75 MPa), also a control (0 MPa) was used. Four replicates of twenty-five seeds were done. The seeds were exposed for 24 h to the PEG 8000, subsequent, irrigations were done with distilled water. The seeds were exposed for 24 h to PEG 8000, later, the seeds were irrigated with distilled water. The germinated seeds were counted on the seventh day and reported as germination percentage. In a sample, of ten seedlings of each repetition, length and weight were measured, separately, from the aerial part and the root. Results. From the evaluated materials, the hybrids H-563, H-565 and H-568 endured a stress of -0.5 MPa, and the H-520, H-567 and HEV3B hybrids presented germination with -0.75 MPa and stood out in all the variables evaluated. Conclusion. It is possible to identify materials that will tolerate stress conditions during the germination stage.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[estación lluviosa]]></kwd>
<kwd lng="es"><![CDATA[imbibición de semillas]]></kwd>
<kwd lng="es"><![CDATA[osmolaridad]]></kwd>
<kwd lng="es"><![CDATA[plántulas]]></kwd>
<kwd lng="es"><![CDATA[sequía]]></kwd>
<kwd lng="en"><![CDATA[drought]]></kwd>
<kwd lng="en"><![CDATA[osmorality]]></kwd>
<kwd lng="en"><![CDATA[rainy season]]></kwd>
<kwd lng="en"><![CDATA[seed filling]]></kwd>
<kwd lng="en"><![CDATA[seedlings]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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