<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442016000100341</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v64i1.18416</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Anatomía Floral de Peristethium leptostachyum (Loranthaceae)]]></article-title>
<article-title xml:lang="en"><![CDATA[Floral anatomy of Peristethium leptostachyum (Loranthaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Robles]]></surname>
<given-names><![CDATA[Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Raz]]></surname>
<given-names><![CDATA[Lauren]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marquínez]]></surname>
<given-names><![CDATA[Xavier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Departamento de Biología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CO</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional de Colombia  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>CO</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<volume>64</volume>
<numero>1</numero>
<fpage>341</fpage>
<lpage>352</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442016000100341&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442016000100341&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442016000100341&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenPeristethium leptostachyum es una especie hemiparásita de la familia Loranthaceae, distribuida en Colombia, Costa Rica, Ecuador, Perú, Venezuela y Panamá. Previamente tratada como Struthanthus leptostachyus, la especie fuerecientemente fue reubicada en Peristethium junto con otras que previamente estaban en los géneros Cladocolea y Struthanthus. La decisión de reconocer a Peristethium como género es controversial y fue tomada con base en caracteres de la inflorescencia y de la flor; en tanto que la monofilia de los tres géneros nombrados es incierta. En esta investigación se estudió la morfoanatomía de flores e inflorescencias de Peristethium leptostachyum, detallando la estructura del androceo y gineceo, así como los procesos de microgametogénesis y megagametogénesis; adicionalmente se realizaron comparaciones con especies afines y precisiones en relación con las diagnosis previas. Se recolectaron flores en diversas fases de desarrollo en Santa María (Boyacá-Colombia), se prepararon y analizaron bajo microscopio secciones histológicas teñidas con astrabluefucsina, además de disecciones bajo estereomicroscopio. Los resultados mostraron que P. leptostachyum comparte caracteres inflorenciales con Cladocolea (inflorescencia determinada, flor terminal ebracteada), pero también con Struthanthus (pares de tríadas a lo largo del eje, brácteas caducas y flores actinomorfas). Las flores de P. Leptostachyum de Santa María son claramente hermafroditas, con androceos y gineceos totalmente desarrollados; lo cual contradice la descripción hecha por Kuijt que reporta una condición dioica para esta especie. El androceo resultó afín al de Struthanthus vulgaris, con tapetum glandular y microsporogénesis simultánea; en contraste, Cladocolea loniceroides presenta tapetum periplasmodial y microesporogénesis sucesiva. El gineceo de P. leptostachyum, al igual que en Cladocolea, Struthanthus y Phthirusa, es unilocular con mamelón y tejido arquesporial orientado hacia el estilo, el cual es sólido y con tejido amilífero. P. leptostachyum es afín a Cladocolea loniceroides y difiere de Struthanthus vulgaris por presentar varios sacos embrionarios y pelvis (hipostasa) no lignificada. La presencia de un canal estilar sólido se propone como sinapomorfía de la tribu Psittacanthinae. Dado que P. Leptostachyum comparte caracteres anatómicos florales tanto con Cladocolea como con Strutanthus, la relación entre estos tres géneros no queda resuelta, se requieren estudios filogenéticos para establecer esta relación y poner a prueba las hipótesis de monofilia de cada uno de ellos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractPeristethium leptostachyum is a hemiparasite species of the family Loranthaceae, distributed in Colombia, Costa Rica, Ecuador, Peru, Venezuela and Panama. Previously treated as Struthanthus leptostachyus, the species was recently transferred to Peristethium together with other species of Cladocolea and Struthanthus. The present research describes the inflorescence and floral morphoanatomy of Peristethium leptostachyum, detailing the structure of the androecium and gynoecium and the processes of microgametogenesis and megagametogenesis, thus allowing comparison with Struthanthus and Cladocolea. Flowering material was collected in February and August 2012, in Santa María, Boyacá, Colombia. Histological sections were prepared and stained with astrablue-fuchsin and floral dissections were performed under a stereomicroscope. Peristethium leptostachyum shares inflorescence characters with Cladocolea (determinate inflorescence, ebracteate terminal flower), but also with Struthanthus (pairs of triads along the axis, deciduous bracts and actinomorphic flowers). The flowers of P. leptostachyum from Santa María are clearly hermaphrodites with androecium and gynoecium fully developed. This observation contradicts the description by Kuijt who reported this species to be dioecious. The androecium was observed to be similar to that of Struthanthus vulgaris, with a glandular tapetum and simultaneous microsporogenesis; in contrast, Cladocolea loniceroides has a periplasmodial tapetum and successive microsporogenesis. The gynoecium of P. leptostachyum, like that of Cladocolea, Struthanthus and Phthirusa, has a unilocular ovary with a mamelon and arquesporial tissue isoriented towards the style, which in turn is solid and amyliferous. Peristethium leptostachyum is similar to Cladocolea loniceroides and differs from Strutanthus vulgaris in presenting multiple embryo sacs and an unlignified pelvis (hipostase). The presence of a solid stylar canal is proposed as a synapomorphy of the tribe Psittacanthinae. Given that P. leptostachyum shares characters with both Cladocolea and Struthanthus generic placement cannot be clearly determined on the basis of anatomical evidence. Phylogenetic studies that include representative species of all three genera are desirable to test hypotheses of monophyly. The sexual system observed here in P. leptostachyum is different from that reported by Kuijt and more studies are needed to identify the factors (geographic, ecological, etc.) that influence this variation. Rev. Biol. Trop. 64 (1): 341-352. Epub 2016 March 01.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Santalales]]></kwd>
<kwd lng="es"><![CDATA[dioica]]></kwd>
<kwd lng="es"><![CDATA[hermafrodita]]></kwd>
<kwd lng="es"><![CDATA[hipostasa]]></kwd>
<kwd lng="es"><![CDATA[mamelón]]></kwd>
<kwd lng="es"><![CDATA[microesporogénesis]]></kwd>
<kwd lng="es"><![CDATA[psittacanthinae]]></kwd>
<kwd lng="es"><![CDATA[tapetum glandular]]></kwd>
<kwd lng="es"><![CDATA[tapetum periplasmodial]]></kwd>
<kwd lng="en"><![CDATA[Santalales]]></kwd>
<kwd lng="en"><![CDATA[dioecious]]></kwd>
<kwd lng="en"><![CDATA[hermaphrodite]]></kwd>
<kwd lng="en"><![CDATA[hypostase]]></kwd>
<kwd lng="en"><![CDATA[mamelon]]></kwd>
<kwd lng="en"><![CDATA[microsporogenesis]]></kwd>
<kwd lng="en"><![CDATA[Psittacanthinae]]></kwd>
<kwd lng="en"><![CDATA[glandular tapetum]]></kwd>
<kwd lng="en"><![CDATA[periplasmodial tapetum]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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