<?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>S1405-31952006000100125</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la procedencia geográfica y de la fertilización en la fenología del brote terminal en plántulas de Pseudotsuga sp.]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of geographic origin and nutrition on shoot phenology of mexican Douglas-Fir (Pseudotsuga sp.) Seedlings]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Acevedo-Rodríguez]]></surname>
<given-names><![CDATA[Ramiro]]></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[López-Upton]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Velázquez Mendoza]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Montecillo Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2006</year>
</pub-date>
<volume>40</volume>
<numero>1</numero>
<fpage>125</fpage>
<lpage>137</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952006000100125&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952006000100125&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952006000100125&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Con el propósito de evaluar las implicaciones del uso de germoplasma fuera de su hábitat natural y en la producción de plantas en vivero, se evaluó la influencia de la procedencia geográfica, así como el efecto de la fertilización, sobre las características fenológicas del brote terminal en plántulas de Pseudotsuga sp. obtenidas de semillas procedentes de siete poblaciones de diferentes regiones del país. Los resultados mostraron una variación significativa (p&#8804;0.01) entre poblaciones en las fechas de inicio y terminación y en la duración del período de crecimiento del brote terminal, con diferencias de siete semanas entre las poblaciones extremas. El rompimiento de la yema terminal se correlacionó negativamente con la altitud del sitio de origen (r=&#8722;0.78), sugiriendo una relación adaptativa con la temperatura umbral requerida para iniciar el crecimiento del brote. Aunque no se encontró un patrón geográfico bien definido, las poblaciones del norte de México tienen una estacionalidad de crecimiento del brote diferente a las del centro de México. Además, las poblaciones del centro de México presentaron menor heterogeneidad individual en los eventos fenológicos asociados al crecimiento del brote. Al utilizar una dosis elevada de fertilización se adelantó la fecha de inicio del crecimiento en 10 d y se retrasó la formación de la yema terminal en 9 d, aumentando el período de crecimiento del brote en casi tres semanas y reduciendo la heterogeneidad de los eventos fenológicos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract To evaluate the implications on use of germplasm outside its natural habitat and on seedling production in the nursery, the influence of geographic origin and nutrition dose on shoot phenology traits was evaluated in Pseudotsuga sp. seedlings from seven populations obtained from different regions in México. Results showed significant variation (p&#8804;0.01) among populations in dates of budburst and budset and in the duration of the growing season for the terminal shoot, with seven weeks of difference between extreme populations. Date of budburst was negatively correlated (r=&#8722;0.78) with the site elevation, suggesting an adaptative relationship with the threshold temperature to begin shoot growth. Although a simple geographic trend was not detected, northern populations had a different growing season with respect to populations from central México. In addition, seedlings from central México were less heterogeneous within populations in phenological traits, compared to northern seedlings. The high fertilization level accelerated budburst by ten days and retarded budset by nine days, increasing the growing season by almost three weeks and reducing the heterogeneity of the phenological events.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Pseudotsuga sp.]]></kwd>
<kwd lng="es"><![CDATA[adaptación]]></kwd>
<kwd lng="es"><![CDATA[crecimiento del brote]]></kwd>
<kwd lng="es"><![CDATA[fenología vegetativa]]></kwd>
<kwd lng="es"><![CDATA[formación de yema]]></kwd>
<kwd lng="en"><![CDATA[Pseudotsuga sp.]]></kwd>
<kwd lng="en"><![CDATA[adaptation]]></kwd>
<kwd lng="en"><![CDATA[shoot growth]]></kwd>
<kwd lng="en"><![CDATA[vegetative]]></kwd>
<kwd lng="en"><![CDATA[phenology]]></kwd>
<kwd lng="en"><![CDATA[budset]]></kwd>
</kwd-group>
</article-meta>
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