<?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>S2007-42982021000400791</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2798</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Biología reproductiva de Thelocactus leucacanthus ssp. schmollii (Cactaceae), un cactus microendémico de Querétaro, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Reproductive biology of Thelocactus leucacanthus ssp. schmollii (Cactaceae), a microendemic cactus of Querétaro, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Delgado-Ramírez]]></surname>
<given-names><![CDATA[Verónica]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camacho-Velázquez]]></surname>
<given-names><![CDATA[Aldebaran]]></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>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>99</volume>
<numero>4</numero>
<fpage>791</fpage>
<lpage>806</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982021000400791&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982021000400791&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982021000400791&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Thelocactus leucacanthus ssp. schmollii (Cactaceae) tiene una distribución restringida al estado de Querétaro y está categorizada como un taxón de preocupación menor en la lista roja de la IUCN y en el apéndice II de la CITES, pero no se encuentra en ninguna categoría en la NOM-059-SEMARNAT-2010.  Preguntas: ¿Cuál es el sistema de cruza y de apareamiento de T. leucacanthus ssp. schmollii? ¿Qué recompensas florales ofrece a sus visitantes y cuáles son sus potenciales polinizadores?  Especie de estudio: Thelocactus leucacanthus ssp. schmollii (Cactaceae).  Sitio de estudio y fechas: Peñamiller, Querétaro, México en 2018.  Métodos: Se realizaron tratamientos de polinización controlada para determinar el sistema de cruza, estableciéndose el porcentaje de frutos y promedio de semillas que se formaron por cada tratamiento. Se determinó el índice de entrecruza de Cruden (IEC). Se realizó el estudio de la morfo-anatomía del nectario y se realizaron observaciones de los visitantes florales.  Resultados: T. leucacanthus ssp. schmollii es xenógama según el IEC y presenta entrecruza estricta de acuerdo con los tratamientos de polinización. Los principales polinizadores son abejas del género Lasioglossum, siendo el polen la principal recompensa.  Conclusiones: Debido a que este taxón únicamente produce semillas por entrecruza, las alteraciones en el ambiente causadas en el área de estudio disminuyen el tamaño de la población, limitando el número de posibles parejas para cruzarse y en consecuencia la disminución de la diversidad genética.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Thelocactus leucacanthus ssp. schmollii (Cactaceae) has a distribution restricted to Querétaro, and it is categorized as a taxon of least concern in the IUCN red list, and in CITES Appendix II, but it is not found in any category of NOM-059-SEMARNAT-2010.  Questions: What is the mating and breeding systems of T. leucacanthus ssp. schmollii? What kind of floral rewards does it offer to its visitors, and which are its potential pollinators?  Studied species: Thelocactus leucacanthus ssp. schmollii (Cactaceae)  Study site and dates: Peñamiller, Querétaro, Mexico, during 2018.  Methods: To determine the mating system, controlled pollination treatments were made, establishing the fruit percentage and seed mean that were formed per treatment. Cruden&#8217;s outcrossing index (OCI) was determined. The nectary morpho-anatomy was described, and the floral visitors were recorded.  Results: T. leucacanthus ssp. schmollii is xenogamous according to OCI, and it has a strict outcrossing system according to the pollination treatments. The main pollinators are bees from the genus Lasioglossum, and the main reward is pollen.  Conclusions: Since this taxon only produces seeds by xenogamy, the alterations in the environment caused in the study site reduce the population size, limiting the number of possible mating partners and in consequence, diminishing the genetic diversity.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[polinización]]></kwd>
<kwd lng="es"><![CDATA[recompensas florales]]></kwd>
<kwd lng="es"><![CDATA[sistema de apareamiento]]></kwd>
<kwd lng="es"><![CDATA[sistema de cruza]]></kwd>
<kwd lng="en"><![CDATA[pollination]]></kwd>
<kwd lng="en"><![CDATA[floral rewards]]></kwd>
<kwd lng="en"><![CDATA[breeding system]]></kwd>
<kwd lng="en"><![CDATA[mating system]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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