<?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>S2007-42982018000400662</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2013</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Variación anatómica del tallo y ultraestructura de la membrana de la punteadura en los elementos traqueales de Selaginella pallescens (Selaginellaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Grego-Valencia]]></surname>
<given-names><![CDATA[Dalia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</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 contrib-type="author">
<name>
<surname><![CDATA[Tejero-Díez]]></surname>
<given-names><![CDATA[J. Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lara-Martínez]]></surname>
<given-names><![CDATA[Reyna]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-García]]></surname>
<given-names><![CDATA[Luis Felipe]]></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-group>
<aff id="Af1">
<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="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México  ]]></institution>
<addr-line><![CDATA[Ciudad 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>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Depto. de Biología Celular]]></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>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2018</year>
</pub-date>
<volume>96</volume>
<numero>4</numero>
<fpage>662</fpage>
<lpage>677</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982018000400662&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982018000400662&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982018000400662&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes: La posible variación anatómica intraespecífica en traqueofitas inferiores no se registra. En este trabajo se describe la anatomía de tallos aéreos de Selaginella pallescens de diferentes hábitats, así como la membrana de la punteadura (MP) del xilema.  Hipótesis: Existe variación significativa estructural del tallo aéreo y de la MP en una especie con relación a su forma de crecimiento y hábitat.  Especie de estudio: Selaginella pallescens (C. Presl) Spring.  Sitio de estudio: Cinco localidades, Estado de México, septiembre de 2016.  Métodos: Se utilizaron técnicas de microscopía de luz, electrónica de barrido y de transmisión, para describir la anatomía caulinar y la ultraestructura de la MP de S. pallescens. Se buscaron diferencias significativas de los atributos anatómicos por medio de análisis de varianza del modelo general lineal, seguido de análisis de comparación de medias asociados a la forma de crecimiento, sustrato y tipo de vegetación de los sitios de colecta.  Resultados: Selaginella pallescens presenta forma de crecimiento arrosetada y erecta. Anatómicamente, el córtex varía en la proporción de esclerénquima. El xilema presenta traqueidas y elementos de vaso. Las MPs en metaxilema y protoxilema muestran diferencias ultraestructurales. Existen diferencias en cinco variables anatómicas relacionadas con el sustrato, la forma de crecimiento y el tipo de vegetación.  Conclusiones: Selaginella pallescens tiene plasticidad en su forma de crecimiento, también en el córtex y tejido vascular como posible respuesta al ambiente. La ultraestructura de las células cribosas muestra características que apoyan la separación taxonómica entre licopodios y helechos. Las diferencias en las MPs se interpretan en términos de seguridad en la conducción hidráulica de esta especie.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background: The possible intraspecific anatomical variation in inferior tracheophytes is not recorded. In this study, we describe the anatomical variation of the aerial stems of Selaginella pallescens and the pit membrane (PM).  Hypothesis: There is significant structural variation of the aerial stem and PM in a single species in relation to its growth form and habitat.  Species of study: Selaginella pallescens (C. Presl) Spring.  Study site: State of Mexico, in five localities, September 2016.  Methods: Light microscopy, scanning electron and transmission electron microscopy techniques were used to describe the caulinar anatomy and ultrastructure of the PM of S. pallescens. We searched for significant differences in the anatomical attributes by means of analysis of variance of the linear general model, followed by analysis of comparison of means associated to the growth form, substrate and vegetation type of the collection sites.  Results: Erect and arrosetate growth form occur in S. pallescens. Anatomically, the cortex varies in the proportion of sclerenchyma. The xylem includes tracheids and vessel elements. The MPs in metaxilema and protoxilema show ultrastructural differences. There are differences in five anatomical variables related to the substrate, the form of growth and the type of vegetation.  Conclusions: Selaginella pallescens has plasticity in growth form, as well as in cortex and vascular tissue as possible response to the environment. The ultrastructure of sieve cells shows characteristics that support taxonomic separation between lycopods and ferns. The differences in PM are interpreted in terms of security in the hydraulic conduction of this species.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Lycopodiopsida]]></kwd>
<kwd lng="es"><![CDATA[membrana de la punteadura]]></kwd>
<kwd lng="es"><![CDATA[metaxilema]]></kwd>
<kwd lng="es"><![CDATA[protoxilema]]></kwd>
<kwd lng="es"><![CDATA[variación]]></kwd>
<kwd lng="en"><![CDATA[Lycopodiophyta]]></kwd>
<kwd lng="en"><![CDATA[metaxylem]]></kwd>
<kwd lng="en"><![CDATA[pit membrane]]></kwd>
<kwd lng="en"><![CDATA[protoxylem]]></kwd>
<kwd lng="en"><![CDATA[variation]]></kwd>
</kwd-group>
</article-meta>
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