<?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>S2007-42982017000300527</article-id>
<article-id pub-id-type="doi">10.17129/botsci.1201</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Molecular phylogeny and morphologic data of strains of the genus Coelastrella (Chlorophyta, Scenedesmaceae) from a tropical region in North America (Yucatan Peninsula)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ancona-Canché]]></surname>
<given-names><![CDATA[Katia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Adrián]]></surname>
<given-names><![CDATA[Silvia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Espinosa-Aguilar]]></surname>
<given-names><![CDATA[Margarita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Garduño-Solórzano]]></surname>
<given-names><![CDATA[Gloria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Toledano-Thompson]]></surname>
<given-names><![CDATA[Tanit]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Narváez-Zapata]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valdez-Ojeda]]></surname>
<given-names><![CDATA[Ruby]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Investigación Científica de Yucatán  ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Yucatán Facultad de Veterinaria y Zootecnia ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Centro de Investigación Científica de Yucatán  ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,UNAM Facultad de Estudios Superiores Iztacala ]]></institution>
<addr-line><![CDATA[ Estado de Mexico]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto Politécnico Nacional  ]]></institution>
<addr-line><![CDATA[Reynosa Tamaulipas]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2017</year>
</pub-date>
<volume>95</volume>
<numero>3</numero>
<fpage>527</fpage>
<lpage>537</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982017000300527&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982017000300527&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982017000300527&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background:  Scenedesmaceae family exhibits great morphological variability. High phenotypic plasticity and the presence of cryptic species have resulted in taxonomic re-assignments of Scenedesmaceae members.  Study strains:  Strains CORE-1, CORE-2 and CORE-3 were characterized.  Study site:  Yucatan Peninsula  Methods:  Morphological analyses were executed by optical and scanning electron microscopy. Phylogenetic relationships were examined by ITS-2 and ITS1-5.8S-ITS2 rDNA regions.  Results:  Optical and scanning electron microscopy analyses indicated spherical to ellipsoidal cells and autospore formation correspond to members of the family Scenedesmaceae, as well as observable pyrenoid starch plates. Detailed morphology analysis indicated that CORE-1 had visible granulations dispersed on the cell wall, suggesting identity with Verrucodesmus verrucosus. However CORE-1 did not show genetic relations with this species, and was instead clustered close to the genus Coelastrella. CORE-2 did not show any particular structure or ornamentation, but it did show genetic relations with Coelastrella with good support. CORE-3 showed meridional ribs from end to end, one of them forked and well pronounced, and orange cells in older cultures characteristic of Coelastrella specimens. Phylogenetic trees of ITS-2 and ITS1-5.8S-ITS2 rDNA sequences indicated with good support that all strains were related to the genus Coelastrella despite their morphologic differences.  Conclusions:  This study reports freshwater Coelastrella strains from a tropical region in North America (Yucatan Peninsula) for the first time. The results contribute to knowledge of Coelastrella species, and the fact that they do not always show structures that are useful for taxonomic assignment, probably as a result of phenotypic plasticity.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes:  La familia Scenedesmaceae exhibe gran variabilidad morfológica La alta plasticidad fenotípica y la presencia de especies crípticas han resultado en reasignaciones taxonómicas de los miembros de la familia Scenedesmaceae.  Cepas bajo estudio:  Las cepas CORE-1, CORE-2, CORE-3 fueron caracterizadas.  Sitio de estudio:  Península de Yucatán.  Métodos:  Los análisis morfológicos fueron realizados por microscopía óptica y electrónica de barrido. Las relaciones filogenéticas fueron examinadas por las regiones ribosomales ITS-2 e ITS1-5.8S-ITS2.  Resultados:  Los análisis de microscopía óptica y electrónica de barrido indicaron que las células elipsoidales y la formación de autoesporas corresponden a miembros de la familia Scenedesmaceae, así como el pirenoide y los gránulos de almidón. El análisis detallado de la morfología indicó que CORE-1 presentó granulaciones visibles dispersas en la pared celular, sugiriendo identidad con Verrucodesmus verrucosus. Sin embargo, CORE-1 no mostró relaciones genéticas con esta especie, sino que se agrupó cerca del género Coelastrella. CORE-2 no mostró ninguna estructura u ornamentación en particular, aunque mostró relaciones genéticas de buen soporte con Coelastrella. CORE-3 mostró verrugas o costillas meridionales de polo a polo, uno de ellos bifurcado y bien pronunciado, y en cultivos viejos las células se tornaron de color naranja característico de los especímenes de Coelastrella. Los árboles filogenéticos de las secuencias del ADNr ITS-2 e ITS1-5.8S-ITS2, indicaron con buen soporte que todas las cepas se relacionan con el género Coelastrella a pesar de sus diferencias morfológicas.  Conclusiones:  Este estudio reporta por vez primera, el estudio de cepas de microalgas de agua dulce de Coelastrella en la región tropical de América del Norte (Península de Yucatán). Estos resultados contribuyen al conocimiento de las especies de Coelastrella, y al hecho de que no siempre muestran estructuras que son útiles para la asignación taxonómica, probablemente como resultado de la plasticidad fenotípica.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Microalgae strains]]></kwd>
<kwd lng="en"><![CDATA[internal transcript spacer-2 (ITS-2)]]></kwd>
<kwd lng="en"><![CDATA[Scenedesmaceae]]></kwd>
<kwd lng="en"><![CDATA[ITS1-5.8S-ITS2 rDNA analysis]]></kwd>
<kwd lng="en"><![CDATA[Yucatan peninsula]]></kwd>
<kwd lng="en"><![CDATA[Tropical region in North America]]></kwd>
<kwd lng="es"><![CDATA[Cepas de microalgas]]></kwd>
<kwd lng="es"><![CDATA[espaciador del transcrito interno-2 (ITS-2)]]></kwd>
<kwd lng="es"><![CDATA[Scenedesmaceae]]></kwd>
<kwd lng="es"><![CDATA[análisis del ADNr ITS1-5.8S-ITS2]]></kwd>
<kwd lng="es"><![CDATA[Península de Yucatan]]></kwd>
<kwd lng="es"><![CDATA[Región Tropical de Norte América]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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