<?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>2007-1124</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias pecuarias]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. de cienc. pecuarias]]></abbrev-journal-title>
<issn>2007-1124</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-11242019000100227</article-id>
<article-id pub-id-type="doi">10.22319/rmcp.v10i1.4327</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Dosis letal media (DL 50 ) y reducción de crecimiento (GR 50 ) por irradiación gamma en pasto garrapata (Eragrostis superba)]]></article-title>
<article-title xml:lang="en"><![CDATA[Mean lethal dose (LD 50 ) and growth reduction (GR 50 ) due to gamma radiation in Wilman lovegrass (Eragrostis superba)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez-Holguín]]></surname>
<given-names><![CDATA[Alan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales-Nieto]]></surname>
<given-names><![CDATA[Carlos Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avendaño-Arrazate]]></surname>
<given-names><![CDATA[Carlos Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Corrales-Lerma]]></surname>
<given-names><![CDATA[Raúl]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villarreal-Guerrero]]></surname>
<given-names><![CDATA[Federico]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santellano-Estrada]]></surname>
<given-names><![CDATA[Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gómez-Simuta]]></surname>
<given-names><![CDATA[Yaudiel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto del Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[ Chihuahua]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Chihuahua Facultad de Zootecnia y Ecología ]]></institution>
<addr-line><![CDATA[ Chihuahua]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto del Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[ Chiapas]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria Departamento de Irradiación ]]></institution>
<addr-line><![CDATA[ Chiapas]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2019</year>
</pub-date>
<volume>10</volume>
<numero>1</numero>
<fpage>227</fpage>
<lpage>238</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-11242019000100227&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-11242019000100227&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-11242019000100227&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La radiación gamma puede ser utilizada como agente mutagénico para inducir variabilidad genética en especies vegetales. No obstante, antes de comenzar un programa de mejoramiento mediante mutagénesis, es necesario establecer la dosis de irradiación adecuada. El objetivo fue determinar la dosis letal media (DL50) y de reducción media del crecimiento (RC50) en pasto garrapata (Eragrostis superba Peyr.). Para ello, se irradió semilla con dosis de 0 (tratamiento testigo), 100, 200, 300, 450, 600, 900, 1400, 2000 y 4000 Gray. Las variables evaluadas fueron porcentaje de germinación, índice de velocidad de germinación, longitud de plúmula, longitud de radícula, rendimiento de forraje, producción de semilla, proporción hoja-tallo e índice de concentración de clorofila. Los datos se analizaron por regresión y comparación de medias con la prueba de Dunnett. Con la ecuación de regresión resultante se calculó la DL50 y RC50 para cada variable. Con estos valores se obtuvo una media ponderada, donde la DL50 se ponderó con 30 % y las RC50 con 10 %. En general, todas las características evaluadas se vieron afectadas por la irradiación (P&lt;0.05), y su comportamiento se ajustó a modelos lineales y cuadráticos (P&lt;0.05), lo cual permitió determinar la DL50 y las RC50. Para el mejoramiento genético del pasto garrapata, se recomienda utilizar la ponderación de ambos parámetros, la cual se obtuvo a los 2,486 Gy. Los resultados de este estudio permitirán la implementación de programas de mejoramiento genético por mutagénesis en pasto garrapata.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Gamma radiation can be utilized as a mutagenic agent for inducing genetic variability in plant species. However, the adequate dose of radiation must be established before starting a mutagenesis-based breeding program. The objective was to determine the mean lethal dose (LD50) and the dose for the mean growth reduction (GR50) in Wilman lovegrass (Eragrostis superba Peyr.). For this purpose, the seeds were radiated with doses of 0 (control treatment), 100, 200, 300, 450, 600, 900, 1400, 2000 and 4000 Gray. The evaluated variables were germination percentage, germination speed index, plumule length, radicle length, forage yield, seed production, leaf-stem ratio and chlorophyll concentration index. The data were analyzed through regression analyses and the Dunnett&#8217;s mean comparison test. The LD50 and GR50 generated for each of the evaluated variables were calculated with the resulting regression equation. Based on the values of LD50 and GR50, a weighted mean was estimated; the LD50 was weighted with 30 % while the GR50 with 10%. In general, all the evaluated characteristics were affected by the radiation treatment (P&lt;0.05), and their behavior was adjusted to linear square models (P&lt;0.05), allowing the determination of the LD50 and the GR50. The weighting average of both parameters, estimated at 2486 Gy, is recommended for the genetic breeding of Wilman lovegrass. The results of this study will allow implementing mutagenesis-based plant breeding programs in Wilman lovegrass.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cobalto 60]]></kwd>
<kwd lng="es"><![CDATA[Rayos gamma]]></kwd>
<kwd lng="es"><![CDATA[Mutaciones]]></kwd>
<kwd lng="es"><![CDATA[DL50]]></kwd>
<kwd lng="es"><![CDATA[RC50]]></kwd>
<kwd lng="en"><![CDATA[Cobalt 60]]></kwd>
<kwd lng="en"><![CDATA[Gamma radiation]]></kwd>
<kwd lng="en"><![CDATA[Mutations]]></kwd>
<kwd lng="en"><![CDATA[DL50]]></kwd>
<kwd lng="en"><![CDATA[RC50]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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