<?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>S2007-42982019000100100</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2077</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The structure of nectaries in the genus Strombocactus (Cactaceae)]]></article-title>
<article-title xml:lang="es"><![CDATA[La estructura de los nectarios en el género Strombocactus (Cactaceae)]]></article-title>
</title-group>
<contrib-group>
<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[Arias]]></surname>
<given-names><![CDATA[Salvador]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Márquez-Guzmán]]></surname>
<given-names><![CDATA[Judith]]></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>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología Jardín Botánico]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2019</year>
</pub-date>
<volume>97</volume>
<numero>1</numero>
<fpage>100</fpage>
<lpage>109</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982019000100100&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982019000100100&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982019000100100&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background:  Floral nectar is offered by the plant to its pollinators to promote cross-fertilization.  Questions:  Are floral nectaries morpho-anatomically similar among the taxa of Strombocactus? What sugars do nectaries offer their pollinators?  Studied species: Strombocactus disciformis subsp. disciformis, S. disciformis subsp. esperanzae and S. corregidorae, during 2016-2018.  Methods:  Bud flowers and flowers in anthesis from each taxon of Strombocactus, were processed to be observed in SEM; other specimens were embedded in Paraplast and sectioned to histochemical tests. The concentration of nectar was measured using a refractometer.  Results:  The nectaries are similar among the three studied taxa, located below the stamens and reach the upper part of the ovary forming a ring in the hypanthium. An almost flat epidermis constitutes the nectary in S. disciformis subsp. esperanzae, although in S. disciformis subsp. disciformis is slightly bulked and papillae in S. corregidorae, a nectariferous parenchyma composed of metabolically very active cells, and a subnectariferous parenchyma of larger cells, associated with vascular bundles. The nectar is secreted through nectarostomata. The concentration of nectar was 8.65 ± 3.98, 16.12 ± 4.48 and 22.09 ± 7.42 °Brix for S. disciformis subsp. esperanzae, S. corregidorae and S. disciformis subsp. disciformis, respectively.  Conclusions:  All taxa of Strombocactus have an annular-type nectary that secretes a low volume of nectar and together with pollen are offered as rewards. Based on other floral characteristics observed, such as the diurnal anthesis, the infundibuliform shape and the color of the flower, we propose that bees pollinate these species.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes:  El néctar ofrecido por parte de la planta a sus polinizadores, promueve la entrecruza.  Preguntas:  ¿Los nectarios florales de los taxones de Strombocactus son morfo-anatómicamente similares? ¿Qué azúcares ofrecen los nectarios a sus polinizadores?  Especies de estudio: Strombocactus disciformis subsp. disciformis, S. disciformis subsp. esperanzae y S. corregidorae, durante 2016-2018.  Métodos:  Botones florales y flores en antesis de cada taxón de Strombocactus se procesaron para ser observados en MEB o ser incluidos en paraplast para realizar pruebas histoquímicas. La concentración del néctar se midió con un refractómetro.  Resultados:  Los nectarios de los tres taxones son semejantes, se ubican abajo de la inserción de los estambres y llegan hasta la parte superior del ovario formando un anillo en el hipantio. Los nectarios tienen una epidermis casi plana en S. disciformis subsp. esperanzae, ligeramente abultada en S. disciformis subsp. disciformis y papilosa en S. corregidorae, un parénquima nectarífero de células metabólicamente activas y un parénquima subnectarífero de células grandes, asociado a haces vasculares. El néctar se secreta mediante nectarostomas. La concentración del néctar fue de 8.65 ± 3.98, 16.12 ± 4.48 y 22.09 ± 7.42 °Brix para S. disciformis subsp. esperanzae, S. corregidorae y S. disciformis subsp. disciformis, respectivamente.  Conclusiones:  Todos los taxones de Strombocactus tienen un nectario tipo anular que secreta un bajo volumen de néctar y, junto con el polen se ofrecen como recompensas. Basándonos en atributos florales observados, como la antesis diurna, la forma infundibuliforme y el color de la flor, proponemos que las abejas polinizan estas especies.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[floral nectaries]]></kwd>
<kwd lng="en"><![CDATA[nectar]]></kwd>
<kwd lng="en"><![CDATA[nectarostomata]]></kwd>
<kwd lng="en"><![CDATA[nectary chamber]]></kwd>
<kwd lng="es"><![CDATA[Cámara nectarial]]></kwd>
<kwd lng="es"><![CDATA[néctar]]></kwd>
<kwd lng="es"><![CDATA[nectarios florales]]></kwd>
<kwd lng="es"><![CDATA[nectarostoma]]></kwd>
</kwd-group>
</article-meta>
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