<?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>S2007-42982016000300551</article-id>
<article-id pub-id-type="doi">10.17129/botsci.531</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Anatomical and histochemical bark changes due to growth of Tillandsia recurvata (ball moss)]]></article-title>
<article-title xml:lang="es"><![CDATA[Cambios anatómicos e histoquímicos en la corteza de árboles debido al crecimiento de Tillandsia recurvata (Musgo bola)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguilar-Rodríguez]]></surname>
<given-names><![CDATA[Silvia]]></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[Huidobro-Salas]]></surname>
<given-names><![CDATA[María Elena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguirre-León]]></surname>
<given-names><![CDATA[Ernesto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México FES Iztacala Laboratorio de Botánica]]></institution>
<addr-line><![CDATA[ Estado de Mexico]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología ]]></institution>
<addr-line><![CDATA[ D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Herbario IZTA ]]></institution>
<addr-line><![CDATA[ Estado de Mexico]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México FES Iztacala ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2016</year>
</pub-date>
<volume>94</volume>
<numero>3</numero>
<fpage>551</fpage>
<lpage>562</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982016000300551&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982016000300551&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982016000300551&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Excessive growth of Tillandsia recurvata (ball moss) may impact host architecture and survival. For a better understanding of this effect, an anatomical and histochemical bark assessment was carried out in four host species. The PCoA (principal coordinate analysis) showed that the presence of tannins, lignin and a lipidic substance as well as different periderm characteristics (number of phellem and phelloderm layers) and bark thickness are the most important bark traits detected as a response to epiphyte growth. The establishment of ball moss can occur on rough and smooth barks; however barks differed in their anatomy and response to the establishment of ball moss. For example, the development of a wounded periderm and the deposition of condensed tannins in the bark of Prosopis laevigata and Parkinsonia praecox distinguished them from the other two hosts studied. In contrast, neither anatomical nor histochemical changes in Crataegus mexicana or Pittocaulon praecox were obvious due to the intrinsic presence of chemical and structural barriers, respectively. In the studied host species, a matrix of a lipidic substance was formed in the bark-root interface, whether this substance is produced by the roots of the ball moss or the hosts, needs further research. Bark responses to ball moss can be divided into mechanical and chemical and both are strategies related to the taxonomic group of the studied host species.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El crecimiento excesivo de Tillandsia recurvata (Musgo bola) modifica la arquitectura y la supervivencia de los forófitos. Para una mejor comprensión de este efecto, se estudió la anatomía e histoquímica de la corteza en cuatro especies de árboles hospederos. El análisis de coordenadas principales (PCoA) mostró que la presencia de taninos, lignina y una sustancia lipídica, así como diferentes características de la peridermis (número de capas del felema y felodermis) y el grosor de la corteza son las respuestas más importantes de la corteza ante el establecimiento de la epífita. El Musgo bola puede establecerse en cortezas rugosas y lisas; sin embargo, las cortezas difieren en su anatomía y en su respuesta al establecimiento de la epífita. Por ejemplo, las cortezas de Prosopis laevigata y Parkinsonia praecox se distinguen por el desarrollo de un súber de reacción y la expresión de taninos condensados. En contraste, ningún cambio anatómico o histoquímico se evidenció en Crataegus mexicana y Pittocaulon praecox, debido a la presencia intrínseca de barreras químicas y estructurales, respectivamente. En las especies estudiadas se formó una matriz de naturaleza lipídica en la interface corteza-raíz; sin embargo, se desconoce si la raíz del Musgo bola o los hospederos la producen, pregunta que requiere de trabajo adicional. La respuesta de la corteza al Musgo bola puede dividirse en mecánica o química y ambas son estrategias relacionadas al grupo taxonómico de las especies hospederas estudiadas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Bark changes]]></kwd>
<kwd lng="en"><![CDATA[Crataegus mexicana]]></kwd>
<kwd lng="en"><![CDATA[epiphyte]]></kwd>
<kwd lng="en"><![CDATA[host]]></kwd>
<kwd lng="en"><![CDATA[Parkinsonia praecox]]></kwd>
<kwd lng="en"><![CDATA[Pittocaulon praecox]]></kwd>
<kwd lng="en"><![CDATA[Prosopis laevigata]]></kwd>
<kwd lng="en"><![CDATA[semiarid regions]]></kwd>
<kwd lng="es"><![CDATA[Cambios de la corteza]]></kwd>
<kwd lng="es"><![CDATA[Crataegus mexicana]]></kwd>
<kwd lng="es"><![CDATA[epífitas]]></kwd>
<kwd lng="es"><![CDATA[huésped]]></kwd>
<kwd lng="es"><![CDATA[Parkinsonia praecox]]></kwd>
<kwd lng="es"><![CDATA[Pittocaulon praecox]]></kwd>
<kwd lng="es"><![CDATA[Prosopis laevigata]]></kwd>
<kwd lng="es"><![CDATA[regiones semiáridas]]></kwd>
</kwd-group>
</article-meta>
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