<?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>S1405-31952017000100091</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Capacidad reproductiva de Pinus pinceana Gordon en el límite sur de su distribución natural]]></article-title>
<article-title xml:lang="en"><![CDATA[Pinus pinceana Gordon reproductive capacity at the south limit of its natural distribution]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiroz-Vázquez]]></surname>
<given-names><![CDATA[Rosa I.]]></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 contrib-type="author">
<name>
<surname><![CDATA[Cetina-Alcalá]]></surname>
<given-names><![CDATA[Víctor M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ángeles-Pérez]]></surname>
<given-names><![CDATA[Gregorio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2017</year>
</pub-date>
<volume>51</volume>
<numero>1</numero>
<fpage>91</fpage>
<lpage>104</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952017000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952017000100091&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952017000100091&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Pinus pinceana Gordon es un piñonero endémico de México, con distribución fragmentada, que es mayor en el noreste y escasa en Hidalgo, donde se espera problemas reproductivos. El objetivo de este estudio fue determinar, de 2001 a 2003, la producción de conos y semilla en San Cristóbal (SC) y El Arenalito (EA), municipio El Cardonal, Hidalgo, poblaciones aisladas y en el margen sur de su distribución natural. Cinco conos se recolectaron de cada uno de los 25 árboles seleccionado en cada localidad. En cinco de doce características evaluadas entre las poblaciones se encontraron diferencias significativas, con variación alta entre fechas de producción. En 2001 hubo mayor producción de conos y la eficiencia de producción de semilla llena fue 54 y 55%, en 2002 fue 41 y 32% y en el 2003 fue 38 y 18% en SC y EA, respectivamente. En 2001 se obtuvo 0.96 y 1.10 g de semilla llena por g de cono en SC y en EA, y 0.85 y 0.70 en el 2002, y 0.76 y 0.45 en 2003, en esas localidades; esto es una asignación mayor de recursos a la semilla en el año de más producción de conos. La cantidad de semilla vana aumentó en 62 y 92% en SC y en 125 y 131% en EA durante 2002 y 2003. No obstante, en años de producción alta de conos se obtiene una producción alta de semilla llena por cono, con pesos similares entre años y de 2,162 a 2,367 semilla kg-1. No hay indicaciones de que las poblaciones sufran los efectos de depresión por endogamia, la cual se relaciona más a la variación natural entre años de producción alta o escasa, y la disparidad entre árboles muy productores de conos y aquellos con producción escasa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Pinus pinceana Gordon is an endemic Mexican pine. Its distribution is fragmented, with larger areas in the northeast and scant in Hidalgo, where reproductive problems are expected. The aim of this study was to determine the seeds and cones production, from 2001 to 2003, at San Cristobal (SC) and El Arenalito (EA), El Cardonal municipality, Hidalgo, México, which are isolated populations in the southern part of the species natural distribution range. Five cones were collected from each of the 25 trees selected in each locality. Significant differences were found in five of twelve characteristics evaluated among populations with high variation between production dates. In 2001 cone production was higher, and seed production efficiency was of 54% and 55%. In 2002 it was of 41% and 32% and in 2003 of 38% and 18% in SC and EA, each. In 2001, 0.96 and 1.10 g seed per g cone were obtained at SC and EA, 0.85 and 0.70 in 2002, 0.76 and 0.45 in 2003 in those locations; this is a greater resources allocation to seeds in the highest cone production year. The number of empty seeds increased by 62% and 92% in SC and 125% and 131% in EA during 2002 and 2003. However, in years of high cones production years, a high production of filled seed cones is obtained, with similar weights between years, from 2.162 to 2.367 seed kg-1. There are no indications that these populations are under inbreeding depression effects, which is more related to natural variation between year&#8217;s low or high production, and the disparity between low and high cone production trees.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Eficiencia]]></kwd>
<kwd lng="es"><![CDATA[producción de semilla]]></kwd>
<kwd lng="es"><![CDATA[pino piñonero]]></kwd>
<kwd lng="es"><![CDATA[poblaciones marginales]]></kwd>
<kwd lng="es"><![CDATA[producción de conos]]></kwd>
<kwd lng="en"><![CDATA[Efficiency]]></kwd>
<kwd lng="en"><![CDATA[seed production]]></kwd>
<kwd lng="en"><![CDATA[pine]]></kwd>
<kwd lng="en"><![CDATA[marginal populations]]></kwd>
<kwd lng="en"><![CDATA[cone production]]></kwd>
</kwd-group>
</article-meta>
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