<?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>S1405-31952018000600863</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Energía germinativa en guaje (Leucaena leucocephala cv. Cunningham) con diferentes métodos de escarificación de la semilla]]></article-title>
<article-title xml:lang="en"><![CDATA[Germinative energy in guaje (Leucaena leucocephala cv. Cunningham) with different methods of seed scarification]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Gómez]]></surname>
<given-names><![CDATA[Adrián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosendo-Ponce]]></surname>
<given-names><![CDATA[Adalberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Romero]]></surname>
<given-names><![CDATA[J. Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rosales-Martínez]]></surname>
<given-names><![CDATA[Froylan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Platas-Rosado]]></surname>
<given-names><![CDATA[D. Esteban]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Becerril-Pérez]]></surname>
<given-names><![CDATA[Carlos M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Campus Veracruz ]]></institution>
<addr-line><![CDATA[ Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Metropolitana Unidad Iztapalapa División de Ciencias Biológicas y de la Salud]]></institution>
<addr-line><![CDATA[Unidad Iztapalapa D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados Campus Montecillo ]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2018</year>
</pub-date>
<volume>52</volume>
<numero>6</numero>
<fpage>863</fpage>
<lpage>874</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952018000600863&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952018000600863&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952018000600863&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La velocidad de germinación del guaje (Leucaena leucocephala) después de la siembra debe tenerse en cuenta en la reforestación de espacios dedicados al pastoreo en la zona intertropical de climas cálidos. En este estudio se compararon tratamientos de escarificación en semillas de guaje con el objetivo de evaluar su efecto sobre la energía germinativa y el valor de germinación. El diseño experimental fue completamente al azar, con tres repeticiones por tratamiento y las unidades experimentales fueron grupos de 100 semillas. Los tratamientos fueron: 1) sin escarificación; 2) inmersión en agua a 80 °C por 3 min (hidrotérmico); inmersiones por 12 h en 3) agua a 24 °C; 4) alcohol etílico de 70 °GL; 5) diluyente orgánico thinner, y 6) peróxido de hidrógeno diluido a 2 %. Las semillas se depositaron en un sustrato de suelo tipo franco arcilloso y permanecieron expuestas a la intemperie protegidas con malla sombra. La germinación total fue mayor con la escarificación hidrotérmica (55 %) respecto a los demás tratamientos excepto para la inmersión en agua (p &gt; 0.05), pero con este tratamiento la energía germinativa y viabilidad fue la más baja. La inmersión en agua presentó la mayor energía germinativa (31.66 %), por lo que mejoró la velocidad de germinación de las semillas de guaje sin afectar su valor de germinación y viabilidad. La escarificación hidrotérmica estimuló la germinación total y valor de germinación, pero redujo la velocidad de germinación con respecto a los otros tratamientos, los cuales mostraron valores intermedios de energía germinativa. La escarificación con diluyente orgánico causó el valor más bajo de germinación (4 %) y de germinación total (31 %), respectivamente. Este estudio permite concluir que en semillas de guaje la escarificación por inmersión en agua a 24 °C por 12 h y en agua a 80 °C por 3 min favorecieron la germinación total, pero la inmersión en agua incrementó la velocidad de germinación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The germination velocity of guaje (Leucaena leucocephala) after planting should be considered in the reforestation of spaces dedicated to grazing in the intertropical zone of hot climates. In the present study scarification treatments were compared in guaje seeds with the objective of evaluating its effect on germinative energy and germination value. The experimental design was completely randomized, with three replications per treatment, and the experimental units were groups of 100 seeds. The treatments were as follows: 1) without scarification; 2) immersion in water at 80 ºC for 3 min (hydrothermal); immersions for 12 h in 3) water at 24 ºC; 4) ethylic alcohol of 70 ºGL; 5) organic thinner diluent, and 6) hydrogen peroxide diluted to 2 %. The seeds were deposited in a clay loam soil substrate and remained exposed to the weather protected by shade mesh. Total germination was higher with hydrothermal scarification (55%) with respect to the other treatments, except for immersion in water (p &gt; 0.05), but with this treatment the germinative energy and viability was the lowest. Immersion in water presented the highest germinative energy (31.66 %), thus it improved germination velocity of the guaje seeds without affecting their germination value and viability. The hydrothermal scarification stimulated total germination and germination value, but it reduced germination velocity with respect to the other treatments, which showed intermediate values of germinative energy. Scarification with organic diluent caused the lowest value of germination (4 %) and total germination (31 %), respectively. The present study makes it possible to conclude that in guaje seeds scarification by immersion in water at 24 ºC for 12 h and in water at 80 ºC for 3 min favored total germination, but immersion in water increased germination velocity.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Leucaena leucocephala]]></kwd>
<kwd lng="es"><![CDATA[velocidad de germinación]]></kwd>
<kwd lng="es"><![CDATA[valor de germinación]]></kwd>
<kwd lng="es"><![CDATA[sistemas silvopastoriles]]></kwd>
<kwd lng="en"><![CDATA[Leucaena leucocephala]]></kwd>
<kwd lng="en"><![CDATA[germination velocity]]></kwd>
<kwd lng="en"><![CDATA[germination value]]></kwd>
<kwd lng="en"><![CDATA[silvopastoral grazing systems]]></kwd>
</kwd-group>
</article-meta>
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