<?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>2007-4018</journal-id>
<journal-title><![CDATA[Revista Chapingo serie ciencias forestales y del ambiente]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Chapingo ser. cienc. for. ambient]]></abbrev-journal-title>
<issn>2007-4018</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Chapingo, Coordinación de Revistas Institucionales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-40182020000300469</article-id>
<article-id pub-id-type="doi">10.5154/r.rchscfa.2019.12.096</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Populations of Pinus radiata D. Don differ in low-temperature tolerance and growth rate]]></article-title>
<article-title xml:lang="es"><![CDATA[Poblaciones de Pinus radiata D. Don difieren en la tolerancia a bajas temperaturas y en la tasa de crecimiento]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jesus-Reyes]]></surname>
<given-names><![CDATA[Gardenia de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Hernández]]></surname>
<given-names><![CDATA[J. Jesús]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Huerta]]></surname>
<given-names><![CDATA[Nicacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Upton]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados Postgrado en Ciencias Forestales ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados Postgrado en Recursos Genéticos y Productividad-Fisiología Vegetal ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2020</year>
</pub-date>
<volume>26</volume>
<numero>3</numero>
<fpage>469</fpage>
<lpage>484</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-40182020000300469&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-40182020000300469&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-40182020000300469&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  In Pinus radiata D. Don, one of the most widely planted pines globally, frost damages plantations at the seedling stage.  Objective:  To determine differences in growth and tolerance to low temperatures of native populations (Guadalupe and Cedros islands) of P. radiata in greenhouse and outdoors conditions, under different levels of soil moisture.  Materials and methods:  Low-temperature tolerance was determined through the damage index (DI) in freezing tests at -12 °C during 4 h. In each environment (greenhouse and outdoors) two soil moisture treatments were defined (irrigation and drought). The DI was evaluated with the method of electrical conductivity in primary needles during winter and spring. The absolute growth rate (AGR) of the terminal shoot was obtained by measuring the total height of the seedlings.  Results and discussion:  Average DI of 50 and 64 % were obtained in winter and spring, respectively. In greenhouse, DI was different (P &#8804; 0.05) between populations, being higher in Guadalupe (&gt;59 %) than in Cedros (&lt;42 %), both in winter and spring. Outdoors, Cedros (64.1 %) had a higher DI than Guadalupe (36.5 %) only during winter. DI was similar in both favorable soil moisture and drought conditions. The Guadalupe population presented higher AGRs in both environments and moisture conditions.  Conclusion:  The population of Guadalupe is more sensitive to low temperatures with greater variation in DI, due to its growth dynamics. Differences between populations are useful in the genetic improvement of the species.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción : En Pinus radiata D. Don, uno de los pinos más plantados globalmente, las heladas dañan a las plantaciones en etapa de plántula.  Objetivo: Determinar las diferencias en crecimiento y tolerancia a bajas temperaturas de poblaciones nativas (islas Guadalupe y Cedros) de P. radiata en condiciones de invernadero e intemperie, bajo niveles distintos de humedad.  Materiales y métodos: La tolerancia a bajas temperaturas se determinó mediante el índice de daño (ID) en pruebas de congelamiento a -12 °C durante 4 h. En cada ambiente (invernadero e intemperie) se definieron dos tratamientos de humedad (riego y sequía). El ID se evaluó con el método de conductividad eléctrica en hojas primarias durante el invierno y primavera. La tasa absoluta de crecimiento (TAC) del brote terminal se obtuvo a través de la medición de altura total de las plantas.  Resultados y discusión: En invierno y primavera se obtuvo ID promedio de 50 y 64 %, respectivamente. En invernadero, el ID fue diferente (P &#8804; 0.05) entre las poblaciones, siendo mayor en Guadalupe (&gt;59 %) que en Cedros (&lt;42 %), tanto en invierno como en primavera. En intemperie, Cedros (64.1 %) tuvo mayor ID que Guadalupe (36.5 %) solo durante el invierno. El ID fue similar tanto en el tratamiento de humedad favorable como en la sequía. La población de Guadalupe presentó TAC mayor en ambos ambientes y condiciones de humedad.  Conclusión: La población de Guadalupe es más sensible a las bajas temperaturas con mayor variación en el ID, debido a su dinámica de crecimiento. Las diferencias entre poblaciones son útiles en el mejoramiento genético de la especie.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Damage index]]></kwd>
<kwd lng="en"><![CDATA[water stress]]></kwd>
<kwd lng="en"><![CDATA[Cedros Island]]></kwd>
<kwd lng="en"><![CDATA[Guadalupe Island]]></kwd>
<kwd lng="en"><![CDATA[absolute growth rate]]></kwd>
<kwd lng="es"><![CDATA[Índice de daño]]></kwd>
<kwd lng="es"><![CDATA[estrés hídrico]]></kwd>
<kwd lng="es"><![CDATA[isla Cedros]]></kwd>
<kwd lng="es"><![CDATA[isla Guadalupe]]></kwd>
<kwd lng="es"><![CDATA[tasa absoluta de crecimiento]]></kwd>
</kwd-group>
</article-meta>
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