<?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>S2007-42982022000400814</article-id>
<article-id pub-id-type="doi">10.17129/botsci.3009</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The mixed mating system of a widespread weed: the case of Argemone ochroleuca Sweet (Papaveraceae)]]></article-title>
<article-title xml:lang="es"><![CDATA[El sistema de cruza mixto de una maleza ampliamente distribuida: el caso de Argemone ochroleuca Sweet (Papaveraceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rios-Carrasco]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Santana]]></surname>
<given-names><![CDATA[Sonia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Departamento de Biología Comparada]]></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>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>100</volume>
<numero>4</numero>
<fpage>814</fpage>
<lpage>826</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982022000400814&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982022000400814&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982022000400814&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Argemone ochroleuca is a worldwide invasive weed but is also highly valuable for their chemical compounds. Knowledge about its reproduction will help create plans for its control or its propagation.  Questions: Does A. ochroleuca has an incompatibility system like other Papaveraceae species? Which are the reproductive strategies that favor the seed formation in A. ochroleuca?  Studied species: A. ochroleuca is an annual species with bisexual flowers.  Study site and dates: Mexico City, Mexico. The fieldwork was performed from February to May in 2013, 2014, and 2017.  Methods: Direct observations were made to describe the flower cycle of A. ochroleuca. We used self-pollinated flowers to analyze if this species is self-incompatible by following the pollen tube growth through gynoecium. Controlled pollinations were made to quantify and compare the number of seeds produced per treatment to know the mating system and explore if the species presents a mechanism of reproductive assurance through autogamy, or exhibits inbreeding depression.  Results: A. ochroleuca is self-compatible and exhibits a mixed mating system. Although outcrossing is how more seeds are produced, both autogamy and pseudocleistogamy are present as reproductive assurance mechanisms. Naturally pollinated flowers produce the maximum number of seeds, but inbreeding depression is present in the population. Thus, the number of seeds will be affected by continuous selfing.  Conclusions: This study highlights the mixed mating system and reproductive assurance mechanisms as successful strategies for A. ochroleuca, a common pattern in invasive weeds.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: A. ochroleuca es una maleza invasiva a nivel mundial pero también es altamente valiosa por sus compuestos orgánicos. El conocimiento sobre su reproducción permitirá crear planes para su control o bien para su propagación.  Preguntas: ¿A. ochroleuca tiene un sistema de autoincompatibilidad como otras especies de Papaveraceae? ¿Cuáles son las estrategias reproductivas de A. ochroleuca que favorecen la formación de semillas?  Especie de estudio: A. ochroleuca una especie anual con flores bisexuales.  Sitio y años de estudio: Ciudad de México, México. El trabajo se realizó durante los años 2013, 2014 y 2017 de febrero a mayo.  Métodos: Se realizaron observaciones directas para describir el ciclo floral. Asimismo, se analizó el crecimiento de los tubos polínicos en flores autopolinizadas, para conocer si son autoincompatibles. Para conocer el sistema de cruza, así como para saber si la especie presenta mecanismos de aseguramiento reproductivo o depresión por endogamia, se realizaron polinizaciones controladas para cuantificar y comparar el número de frutos y semillas formados por tratamiento.  Resultados: A. ochroleuca es autocompatible y presenta un sistema de cruza mixto. Las semillas se forman principalmente por xenogamia, pero la autogamia y la pseudocleistogamia se presentan como mecanismos de aseguramiento reproductivo. Las flores polinizadas naturalmente forman la máxima cantidad de semillas. Sin embargo, la población presenta depresión endogámica indicando que la constante autopolinización afectará la formación de semillas.  Conclusiones: Este trabajo resalta los sistemas de cruza mixtos y el aseguramiento reproductivo como estrategias exitosas en A. ochroleuca, un patrón común en malezas invasoras.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[inbreeding depression]]></kwd>
<kwd lng="en"><![CDATA[invasive weed]]></kwd>
<kwd lng="en"><![CDATA[pseudocleistogamy]]></kwd>
<kwd lng="en"><![CDATA[reproductive assurance]]></kwd>
<kwd lng="en"><![CDATA[self-compatibility]]></kwd>
<kwd lng="es"><![CDATA[depresión endogámica]]></kwd>
<kwd lng="es"><![CDATA[maleza invasora]]></kwd>
<kwd lng="es"><![CDATA[pseudocleistogamia]]></kwd>
<kwd lng="es"><![CDATA[aseguramiento reproductivo]]></kwd>
<kwd lng="es"><![CDATA[autocompatibilidad]]></kwd>
</kwd-group>
</article-meta>
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