<?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>1405-0471</journal-id>
<journal-title><![CDATA[Madera y bosques]]></journal-title>
<abbrev-journal-title><![CDATA[Madera bosques]]></abbrev-journal-title>
<issn>1405-0471</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-04712024000200103</article-id>
<article-id pub-id-type="doi">10.21829/myb.2024.3022548</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variación intraespecífica entolerancia al frío en progenies de Pinus pseudostrobus en dos sitios de evaluación]]></article-title>
<article-title xml:lang="en"><![CDATA[Intraspecific variation in cold tolerance in Pinus pseudostrobus progenies at two test sites]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrera Ramírez]]></surname>
<given-names><![CDATA[Rubén]]></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[Escobar Alonso]]></surname>
<given-names><![CDATA[Sebastián]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez Luna]]></surname>
<given-names><![CDATA[Alberto]]></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[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Uruapan Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>30</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-04712024000200103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-04712024000200103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-04712024000200103&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La tolerancia al frío tiene valor adaptativo en plantas perennes de clima templado-frío, por lo que es importante detectar variación genética en ella para árboles forestales. En dos ensayos de progenie de Pinus pseudostrobus establecidos en Pueblo Nuevo, Puebla (S1, 2853 m) y Teolocholco, Tlaxcala (S2, 2355 m), se determinó el índice de daño celular (ID) en plantas de cuatro años con una prueba de congelamiento, y se estimó su relación con el crecimiento en altura y variables bioclimáticas del sitio de origen de las familias en la región central de México. La tolerancia a frío se determinó con la pérdida de electrolitos (ID) a -15 °C durante 4 h. El análisis de varianza se realizó con Proc Mixed, usando un diseño de bloques completos al azar. El ID fue diferente (P&lt;0.05) entre sitios y mayor en S1 (60.7%) que en S2 (50%); los parámetros genéticos indicaron que la tolerancia al frío está bajo control genético (h2f &#8805;0.50). El crecimiento en altura de las plantas en S2 fue mayor que en S1. Las variables bioclimáticas de mayor correlación (r&#8805;0.55) con ID y el crecimiento en altura están relacionadas con la humedad, temperatura y precipitación de otoño-invierno. El daño por heladas en las familias varió entre sitios, lo que demuestra que existe interacción genotipo-ambiente asociada con resistencia al frío para algunas progenies; además de que los factores climáticos asociados con la humedad, la temperatura y precipitación también son importantes en la adaptación y crecimiento de las progenies de P. pseudostrobus.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Cold tolerance has adaptive value for perennial plants in cold-temperate climates, so it is important to detect genetic variation for this trait in forest trees. In two Pinus pseudostrobus progeny tests established at Pueblo Nuevo, Puebla (S1, 2853 m) and Teolocholco, Tlaxcala (S2, 2355 m), the cell damage index (ID) was determined in four-year-old plants with a freezing test, and its relationship with height growth, and bioclimatic variables at the origin site of families, in the central region of Mexico, was estimated. Tolerance to low temperatures was determined with the electrolyte leakage (REL) method, at -15 °C for 4 h. Analysis of variance was performed with Proc Mixed, using a randomized complete block design. Mean DI differed between sites (P &lt; 0.05) and was higher at S1 (60.7%) than at S2 (50%); genetic parameters indicated that cold tolerance is under genetic control (h2f &#8805;0.50). Height growth of progenies at S2 was greater than at S1. The bioclimatic variables with the highest correlation (r &#8805; 0.55) with ID and height growth are related to humidity, temperature, and precipitation from autumn to winter. Frost damage of families varied between sites, showing that there is genotypeenvironment interaction associated with cold tolerance in some progenies; in addition, climatic factors associated with humidity, temperature and precipitation are also important for adaptation and growth of Pinus pseudostrobus progenies.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[fenología]]></kwd>
<kwd lng="es"><![CDATA[índice de daño]]></kwd>
<kwd lng="es"><![CDATA[tasa de crecimiento]]></kwd>
<kwd lng="es"><![CDATA[tolerancia a heladas]]></kwd>
<kwd lng="es"><![CDATA[variables climáticas]]></kwd>
<kwd lng="en"><![CDATA[phenology]]></kwd>
<kwd lng="en"><![CDATA[damage index]]></kwd>
<kwd lng="en"><![CDATA[growth rate]]></kwd>
<kwd lng="en"><![CDATA[frost tolerance]]></kwd>
<kwd lng="en"><![CDATA[climate variables]]></kwd>
</kwd-group>
</article-meta>
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