<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982019000400725</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2336</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Actividad cambial y cribo-xilogénesis de tres especies en un gradiente altitudinal en la Sierra Nevada, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Cambial activity and phloem-xylogenesis of three plant species in an elevation gradient in the Sierra Nevada, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Noriega]]></surname>
<given-names><![CDATA[Mayte Stefany]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Mata]]></surname>
<given-names><![CDATA[Lauro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar-Rodríguez]]></surname>
<given-names><![CDATA[Silvia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Terrazas]]></surname>
<given-names><![CDATA[Teresa]]></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>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Iztacala Unidad de Morfología y Función]]></institution>
<addr-line><![CDATA[Tlalnepantla Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>97</volume>
<numero>4</numero>
<fpage>725</fpage>
<lpage>740</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982019000400725&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982019000400725&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982019000400725&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes:  Xilema y floema secundarios son derivados del cambium vascular y su dinámica (cribo-xilogénesis) se ha estudiado en coníferas y dicotiledóneas que crecen en un mismo sitio. Estudios que evalúen la cribo-xilogénesis en especies de amplia distribución altitudinal y con diferentes formas de vida son escasos.  Pregunta:  ¿existen diferencias en la actividad cambial y cribo-xilogénesis entre especies con distintas formas de vida y distribución diferencial en un gradiente altitudinal?  Especies de estudio: Alchemilla procumbens, Acaena elongata y Ribes ciliatum.  Sitio de estudio y fechas:  Cerro Tláloc, Sierra Nevada, Estado de México, México, de 2015 a 2017.  Métodos:  Se recolectaron ramas durante 24 meses por especie por sitio y los tejidos se procesaron con la técnica de inclusión en metilcrilato.  Resultados:  Las tres especies pueden diferenciar el floema antes que el xilema, ser simultánea en ambos tejidos (Alchemilla) o el floema ser no conductor antes de finalizar la xilogénesis (Acaena). Los periodos de actividad cambial y de cribo-xilogénesis fueron más largos (17 semanas) en Acaena (hemicriptófita) y Ribes (fanerófita), mientras que en Alchemilla (criptófita) fueron más cortos pero intermitentes a lo largo del año y ambos se redujeron aún más con el incremento en la altitud.  Conclusiones:  La actividad cambial y la xilogénesis entre individuos de diferentes altitudes sugieren que ambos son plásticos y que responden a factores ambientales de cada sitio. En las tres especies, la cribogénesis es menos variable que la xilogénesis como se ha registrado en otras especies. La respuesta rápida de cambium vascular en Alchemilla sugiere que aprovecha los pulsos de factores ambientales beneficiosos para la cribo-xilogénesis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background:  Secondary xylem and secondary phloem are vascular cambium derivatives and their dynamics (phloem-xylogenesis) has been studied in conifers and dicotyledons that grow in the same place. Studies that evaluate the phloem-xylogenesis in species of wide elevation gradients and with different life forms are scarce.  Question:  Are there differences in cambial activity and phloem-xylogenesis between species with different life forms and differential distribution in an altitudinal gradient?  Studied species: Alchemilla procumbens, Acaena elongata and Ribes ciliatum.  Study site and years of study:  Cerro Tláloc, Sierra Nevada, Mexico State, Mexico, from 2015 to 2017.  Methods:  Branches were collected for 24 months per species per site and their tissues were processed through the methyl acrylate-embedding technique.  Results:  The three species can either form phloem before xylem, form both tissues simultaneously (as in Alchemilla) or the phloem become non-conductive before xylogenesis ends (in Acaena). The periods of cambial activity and of phloem-xylogenesis were longer (17 weeks) in Acaena (hemicriptophyte) and Ribes (phanerophyta); while in Alchemilla (cryptophyte) they were shorter but intermittent over the year and both were further reduced as altitude increases.  Conclusions:  The cambial activity and xylogenesis among individuals of different altitudes suggest that both are plastic and respond to environmental factors at each site. In the three species, phloem-genesis is less variable than xylogenesis as it has been recorded in other species. The rapid response of vascular cambium in Alchemilla suggests that it takes advantage of the pulses of environmental factors beneficial to the phloem-xylogenesis.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Altitud]]></kwd>
<kwd lng="es"><![CDATA[cambium vascular]]></kwd>
<kwd lng="es"><![CDATA[Cerro Tláloc]]></kwd>
<kwd lng="es"><![CDATA[desarrollo de floema]]></kwd>
<kwd lng="es"><![CDATA[desarrollo de xilema]]></kwd>
<kwd lng="en"><![CDATA[Cerro Tlaloc]]></kwd>
<kwd lng="en"><![CDATA[elevation]]></kwd>
<kwd lng="en"><![CDATA[phloem development]]></kwd>
<kwd lng="en"><![CDATA[vascular cambium]]></kwd>
<kwd lng="en"><![CDATA[xylem development]]></kwd>
</kwd-group>
</article-meta>
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