<?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>1027-152X</journal-id>
<journal-title><![CDATA[Revista Chapingo. Serie horticultura]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Chapingo Ser.Hortic]]></abbrev-journal-title>
<issn>1027-152X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Chapingo]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1027-152X2021000200101</article-id>
<article-id pub-id-type="doi">10.5154/r.rchsh.2020.07.019</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Physiological response of seeds of three coffee varieties to gamma rays (60Co)]]></article-title>
<article-title xml:lang="es"><![CDATA[Respuesta fisiológica de semillas de tres variedades de café a rayos gamma (60Co)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Spinoso-Castillo]]></surname>
<given-names><![CDATA[José L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Escamilla-Prado]]></surname>
<given-names><![CDATA[Esteban]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar-Rincón]]></surname>
<given-names><![CDATA[Víctor H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales-Ramos]]></surname>
<given-names><![CDATA[Victorino]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-de los Santos]]></surname>
<given-names><![CDATA[Gabino]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Corona-Torres]]></surname>
<given-names><![CDATA[Tarsicio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Chapingo Centro Regional Universitario Oriente ]]></institution>
<addr-line><![CDATA[Huatusco Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Amatlán de los Reyes Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2021</year>
</pub-date>
<volume>27</volume>
<numero>2</numero>
<fpage>101</fpage>
<lpage>112</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1027-152X2021000200101&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1027-152X2021000200101&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1027-152X2021000200101&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Coffea arabica L. faces serious disease susceptibility problems, favored by the low genetic variability of its commercial cultivars; therefore, it is important to study different sources of variation that are useful in genetic improvement. The objective of this study was to irradiate C. arabica seeds of the Geisha, Oro Azteca and Marseillaise varieties with gamma rays to determine the median lethal dose (LD50) and evaluate their physiological response in terms of germination, survival, plant height (PH), stem diameter (SD), height to first leaf pair (HFLP) and leaf area (LA). The Transelektro LGI-01 irradiator was used, with a dose rate of 752.76 Gy·h-1. The irradiation doses evaluated were 0, 100, 200, 300, 400 and 500 Gy. The experiment was established under a completely randomized factorial design with two factors (variety, with three levels, and irradiation dose, with six levels) and three replicates (225 seeds per replicate). The germination record was made 20 days after sowing. The remaining variables were evaluated 120 days after sowing. The results showed that germination, survival, PH, HFLP, SD and LA were significantly negatively affected by gamma irradiation from the 200 Gy dose in all three varieties. The LD50 was 70 Gy for the Geisha variety, 85 Gy for Marsellesa and 90 Gy for Oro Azteca. Doses lower than 100 Gy can be used in breeding programs for C. arabica.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Coffea arabica L. enfrenta serios problemas de susceptibilidad a enfermedades, favorecidos por la poca variabilidad genética de sus cultivares comerciales; por ello, es importante estudiar diferentes fuentes de variación que sean útiles en el mejoramiento genético. El objetivo de este estudio fue irradiar con rayos gamma semillas de C. arabica de las variedades Geisha, Oro Azteca y Marsellesa para determinar la dosis letal media (DL50) y evaluar su respuesta fisiológica sobre la germinación, supervivencia, altura de planta (AP), diámetro de tallo (DT), altura al primer par de hojas (APPH) y área foliar (AF). Se utilizó el irradiador Transelektro LGI-01, con una razón de dosis de 752.76 Gy·h-1. Las dosis de irradiación evaluadas fueron 0, 100, 200, 300, 400 y 500 Gy. El experimento se estableció bajo un diseño factorial completamente al azar con dos factores (variedad, con tres niveles, y dosis de irradiación, con seis niveles) y tres repeticiones (225 semillas por repetición). El registro de la germinación se hizo a los 20 días después de la siembra. Las variables restantes se evaluaron 120 días después de la siembra. Los resultados mostraron que la germinación, supervivencia, AP, APPH, DT y AF se vieron significativamente afectados de forma negativa por la irradiación gamma a partir de la dosis de 200 Gy en las tres variedades. La DL50 fue de 70 Gy para la variedad Geisha, 85 Gy para Marsellesa y 90 Gy para Oro Azteca. Dosis menores a 100 Gy se pueden emplear en programas de fitomejoramiento para C. arabica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Coffea arabica L.]]></kwd>
<kwd lng="en"><![CDATA[median lethal dose (LD50)]]></kwd>
<kwd lng="en"><![CDATA[physical mutagenesis]]></kwd>
<kwd lng="en"><![CDATA[ionizing energy]]></kwd>
<kwd lng="en"><![CDATA[plant breeding]]></kwd>
<kwd lng="es"><![CDATA[Coffea arabica L.]]></kwd>
<kwd lng="es"><![CDATA[dosis letal media (DL50)]]></kwd>
<kwd lng="es"><![CDATA[mutagénesis física]]></kwd>
<kwd lng="es"><![CDATA[energía ionizante]]></kwd>
<kwd lng="es"><![CDATA[fitomejoramiento]]></kwd>
</kwd-group>
</article-meta>
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