<?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>0187-7151</journal-id>
<journal-title><![CDATA[Acta botánica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Act. Bot. Mex]]></abbrev-journal-title>
<issn>0187-7151</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C., Centro Regional del Bajío]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-71512017000400151</article-id>
<article-id pub-id-type="doi">10.21829/abm121.2017.1205</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Evidencia de autopoliploidía y translocaciones en el cariotipo de Tigridia pavonia (Iridaceae, Iridoideae) de la Reserva Ecológica del Pedregal de San Ángel, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Evidence of autopolyploidy and translocations in the karyotype of Tigridia pavonia (Iridaceae, Iridoideae) from the Reserva Ecológica del Pedregal de San Ángel, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tapia-Pastrana]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tapia-Aguirre]]></surname>
<given-names><![CDATA[Fernando]]></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 Zaragoza División de Estudios de Posgrado e Investigación]]></institution>
<addr-line><![CDATA[ Cd. Mx.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<numero>121</numero>
<fpage>151</fpage>
<lpage>158</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512017000400151&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512017000400151&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512017000400151&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos: Tigridia pavonia fue propuesto como un taxon alotetraploide 2n=4x=28, pero sin evidencia citogenética que sustente su origen híbrido. Es una especie de amplia distribución en México y sus poblaciones carecen de una fórmula cariotípica y un análisis detallado de los cromosomas con satélites como criterio para determinar el número de organizadores nucleolares que confirmen o no dominancia nucleolar. En este trabajo se analiza y describe el número y arquitectura cromosómica de T. pavonia de una población mexicana, en búsqueda de evidencias que soporten o descarten su origen híbrido y se propone una fórmula cariotípica acorde al nivel y origen de ploidía.  Métodos: Se utilizó una técnica de extendido en superficie y secado al aire que incluye maceración enzimática y choque hipotónico en meristemos radiculares para obtener los cromosomas en mitosis de seis individuos de T. pavonia, nativa de la Reserva Ecológica del Pedregal de San Ángel, en la Ciudad de México.  Resultados clave: Se confirmó un cariotipo bimodal con 28 cromosomas que, de acuerdo a su similitud morfológica, fueron incluidos en siete grupos de cuatro cromosomas homólogos cada uno. Los cromosomas del grupo más pequeño exhibieron constricciones secundarias asociadas a macrosatélites lo que evidenció ausencia de dominancia nucleolar o amfiplastía diferencial. En el grupo de cromosomas grandes se observaron configuraciones que sugieren rearreglos por translocaciones. Se propone la fórmula 6m + 8sm para el cariotipo haploide.  Conclusiones: Citogenéticamente, la presencia de cuatro satélites descarta un origen alotetraploide y la evidencia de posibles translocaciones se correlaciona con fragmentos, cromosomas B y centrómeros frágiles observados en otras especies del género. Lo anterior apoya el papel activo de las translocaciones en la conformación del cariotipo bimodal de T. pavonia.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims: Tigridia pavonia was proposed as an allotetraploid taxon 2n=4x=28, but without cytogenetic evidence supporting its hybrid origin. It is a widespread species in Mexico and its populations lack karyotype and detailed analysis of chromosomes with satellites as a criterion to determine the number of nucleolar organizers that confirm or not nucleolar dominance. In this paper, we analyze and describe the number and chromosome architecture of T. pavonia from a Mexican population in search of evidences that support or discard its hybrid origin and we propose a karyotype according to the level and origin of ploidy.  Methods: A surface spreading and air drying technique was used that includes enzymatic maceration and hypotonic shock in meristem roots to obtain mitotic chromosomes from six individuals of T. pavonia native to the Reserva Ecológica del Pedregal de San Ángel, Mexico City.  Key results: A bimodal karyotype with 28 chromosomes was confirmed, which according to their similar morphology were included in seven groups of four homologous chromosomes each. All chromosomes in the smallest group exhibited secondary constrictions associated to macrosatellites and this shows the absence of nucleolar dominance or differential amphiplasty. Moreover, in the group of largest chromosomes configurations were observed that suggest rearrangements by translocations. The haploid karyotype 6m + 8sm is proposed here.  Conclusions: Cytogenetically, the presence of four satellites discards an allotetraploid origin and the evidence of possible translocations correlates with fragments, B chromosomes and fragile centromeres observed in other species of this genus. This supports the active role of translocations in the conformation of bimodal karyotype of T. pavonia.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[ausencia de dominancia nucleolar]]></kwd>
<kwd lng="es"><![CDATA[autotetraploide]]></kwd>
<kwd lng="es"><![CDATA[citogenética]]></kwd>
<kwd lng="es"><![CDATA[rearreglos cromosómicos]]></kwd>
<kwd lng="es"><![CDATA[satélites]]></kwd>
<kwd lng="en"><![CDATA[absence of nucleolar dominance]]></kwd>
<kwd lng="en"><![CDATA[autotetraploid]]></kwd>
<kwd lng="en"><![CDATA[chromosomal rearrangements]]></kwd>
<kwd lng="en"><![CDATA[cytogenetics]]></kwd>
<kwd lng="en"><![CDATA[satellites]]></kwd>
</kwd-group>
</article-meta>
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