<?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>S0187-71512020000100109</article-id>
<article-id pub-id-type="doi">10.21829/abm127.2020.1567</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caracterización citológica en Flaveria bidentis y F. haumanii (Asteraceae)]]></article-title>
<article-title xml:lang="en"><![CDATA[Cytological characterization in Flaveria bidentis and F. haumanii (Asteraceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Páez]]></surname>
<given-names><![CDATA[Valeria de los A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Andrada]]></surname>
<given-names><![CDATA[Aldo R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sobrero]]></surname>
<given-names><![CDATA[María T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chaila]]></surname>
<given-names><![CDATA[Salvador]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Fundación Miguel Lillo  ]]></institution>
<addr-line><![CDATA[Tucumán ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Santiago del Estero Facultad de Agronomía y Agroindustrias ]]></institution>
<addr-line><![CDATA[Santiago del Estero ]]></addr-line>
<country>Argentina</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional de Tucumán Facultad de Agronomía y Zootecnia ]]></institution>
<addr-line><![CDATA[Tucumán ]]></addr-line>
<country>Argentina</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<numero>127</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512020000100109&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512020000100109&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512020000100109&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos: Flaveria es un género americano integrado por 23 especies y representado en Argentina por dos de ellas, ambas nativas y anuales: F. bidentis (la cual es considerada maleza de agroecosistemas) y F. haumanii. El género tiene un número cromosómico básico de x=18 y los antecedentes citológicos son referidos a F. bidentis, pero no así para F. haumanii. El objetivo de este trabajo fue caracterizar citogenéticamente a F. bidentis y F. haumanii a través del análisis cariotípico, el comportamiento meiótico y la estimación de la viabilidad de los granos de polen.  Métodos: El material fue recolectado en la provincia de Santiago del Estero (Argentina). Las raíces fueron pretratadas con 8-hidroxiquinoleina 0.002 M durante ocho horas. Inflorescencias y raíces fueron fijadas en Farmer y conservadas en alcohol etílico al 70% en frío. Para la tinción de los cromo somas se utilizó hematoxilina propiónica al 2%. La viabilidad de los granos de polen se estimó mediante las soluciones colorantes de Mützing y DAF.  Resultados clave: Flaveria bidentis y F. haumanii poseen como número cromosómico esporofítico 2n=36, con un cariotipo unimodal simétrico. El comportamiento meiótico es regular y en diacinesis se observó n=18 bivalentes; la viabilidad estimada de los granos de polen fue superior a 90%.  Conclusiones: Se mencionan por primera vez los números cromosómicos esporofíticos y gametofíticos de F. haumanii; además, se completa la información citogenética para F. bidentis a través del análisis de la meiosis. Estos son los primeros datos relacionados con la viabilidad de los granos de polen.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims: Flaveria is an American genus with 23 species; in Argentina it is represented by two of them both native and annual: F. bidentis (which is cited as a weed of agroecosystems) and F. haumanii. The genus is mentioned with a base chromosome number of x=18 and cytogenetic backgrounds for F. bidentis are know, but not so for F. haumanii. The aim of this work was to cytogenetically characterize F. bidentis and F. haumanii through the analysis of mitosis, meiotic behavior and estimation of pollen grain viability.  Methods: The material was collected in the province of Santiago del Estero (Argentina). The root tips were pretreated with 8-hydroxyquinoline 0.002 M for eight hours. Inflorescences and root tips were fixed in Farmer and preserved in cold 70% ethyl alcohol. To stain chromosomes 2% propionic hematoxylin was used. The viability of pollen grains was estimated with the Mützing and DAF stain solutions.  Key results: Flaveria bidentis and F. haumanii have a sporophytic chromosome number of 2n=36, with a symmetric unimodal karyotype. The meiotic behavior was regular, in diakinesis n=18 bivalent was observed and the estimated viability of the pollen grains was greater than 90%.  Conclusions: The sporophytic and gametophytic chromosomal numbers of F. haumanii are mentioned for the first time; in addition, through meiotic analysis the cytogenetic information is completed for F. bidentis. These are the first data related to pollen grain viability.]]></p></abstract>
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<kwd lng="es"><![CDATA[cariotipo]]></kwd>
<kwd lng="es"><![CDATA[comportamiento meiótico]]></kwd>
<kwd lng="es"><![CDATA[mitosis]]></kwd>
<kwd lng="es"><![CDATA[viabilidad del polen]]></kwd>
<kwd lng="en"><![CDATA[karyotype]]></kwd>
<kwd lng="en"><![CDATA[meiotic behavior]]></kwd>
<kwd lng="en"><![CDATA[mitosis]]></kwd>
<kwd lng="en"><![CDATA[pollen viability]]></kwd>
</kwd-group>
</article-meta>
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