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<identifier>oai:HAL:hal-01019867v1</identifier>
<datestamp>2018-01-11</datestamp>
<setSpec>type:ART</setSpec>
<setSpec>subject:sdv</setSpec>
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<setSpec>collection:UNIV-AG</setSpec>
<setSpec>collection:CIRAD</setSpec>
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<metadata><dc>
<publisher>HAL CCSD</publisher>
<title lang=en>Floral development of Urosphatha : merosity and phylogeny in the Lasioideae (Araceae)</title>
<creator>Barabé, Denis</creator>
<creator>Lacroix, Christian</creator>
<creator>Gibernau, Marc</creator>
<contributor>Ecologie des forêts de Guyane (ECOFOG) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (CIRAD) - Institut National de la Recherche Agronomique (INRA) - Université des Antilles et de la Guyane (UAG) - AgroParisTech - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Institut de recherche en biologie végétale ; Université de Montréal</contributor>
<contributor>Departement of Biology ; University of Prince Edward Island</contributor>
<source>ISSN: 0378-2697</source>
<source>EISSN: 1615-6110</source>
<source>Plant Systematics and Evolution</source>
<publisher>Springer Verlag (Germany)</publisher>
<identifier>hal-01019867</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01019867</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01019867</source>
<source>Plant Systematics and Evolution, Springer Verlag (Germany), 2011, 296 (1-2), pp.41-50. 〈10.1007/s00606-011-0475-6〉</source>
<identifier>DOI : 10.1007/s00606-011-0475-6</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/s00606-011-0475-6</relation>
<language>en</language>
<subject lang=en>Inflorescence</subject>
<subject lang=en>Homeosis</subject>
<subject lang=en>Angiosperms</subject>
<subject lang=en>Systematic</subject>
<subject lang=en>Morphogenetic constraints</subject>
<subject>[SDV.SA] Life Sciences [q-bio]/Agricultural sciences</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>In this paper we study merosity in the genus Urospatha within the framework of a resolved phylogeny of the Araceae. We analyse how a transition from dimerous or tetramerous merosity to pentamerous or hexamerous merosity can occur developmentally in the Lasioideae. In Urospatha, initiation of floral primordia along the inflorescence is acropetal, while development of flowers is basipetal. This indicates the presence of two distinct phases in the development of the Urospatha inflorescence. The first phase corresponds to initiation of flowers and establishment of the phyllotactic pattern, and the second phase to differentiation of floral organs. Urospatha is characterized by the presence of trimerous, tetramerous, pentamerous and rarely hexamerous flowers. In all types of flowers, the stamens are closely associated and opposite to the tepals. Pentamerous flowers are formed by addition of a sector comprising a stamen and tepal. Likewise, in the case of hexamerous flowers, two sectors are added. In the Lasioideae, the increase in the number of tepals and stamens is linked with two developmental processes that have appeared independently in the subfamily: (1) addition of one or two stamen-petal sectors (Anaphyllopsis and Urospatha), and (2) independent increase in the number of tepals and stamens on whorls, more or less organized and inserted in alternate position (Dracontium). Tetramerous whorls as they occur in basal Lasioideae would be homologous to two dimerous whorls from an evolutionary point of view.</description>
<date>2011</date>
</dc>
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