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Phylogeny and evolution of achenial trichomes in the Lucilia group ( Asteraceae: Gnaphalieae ) and their systematic significance

Authordc.contributor.authorLuebert Bruron, Federico José 
Authordc.contributor.authorMoreira Muñoz, Andrés 
Authordc.contributor.authorWilke, Katharina 
Authordc.contributor.authorDillon, Michael O. 
Cita de ítemdc.identifier.citationTaxon 66 (5) • October 2017: 1184–1199es_ES
Abstractdc.description.abstractThe Gnaphalieae (Asteraceae) are a cosmopolitan tribe with around 185 genera and 2000 species. The New World is one of the centers of diversity of the tribe with 24 genera and over 100 species, most of which form a clade called the Lucilia-group with 21 genera. However, the generic classification of the Lucilia-group has been controversial with no agreement on delimitation or circumscription of genera. Especially controversial has been the taxonomic value of achenial trichomes and molecular studies have shown equivocal results so far. The major aims of this paper are to provide a nearly complete phylogeny of the Lucilia-group at generic level and to discuss the evolutionary trends and taxonomic significance of achenial trichome morphology. We conducted a phylogenetic analysis of the New World Gnaphalieae with nrDNA (ETS, ITS) sequence data from a sampling of 18 genera of the Lucilia-group and utilized these results to examine morphological evolution of achenial trichome types and presence of apical myxogenic cells. Seven well-supported subclades can be recognized within the Lucilia-group (L1-L7). These results support Brazilian and Andean Berroa, Facelis, Lucilia, and Micropsis forming a clade (L1), the inclusion of Chilean Lucilia under Belloa (L2), the monophyly of Stuckertiella + Gamochaeta + Gamochaetopsis (L3), Chevreulia + Cuatrecasasiella (L4) and Antennaria (L5) excluding Antennaria linearifolia, which is resolved in a monophyletic group together with Jalcophila, Loricaria and Mniodes (L6), and the recognition of Gnaphaliothamnus (L7) removed from Brazilian taxa of Chionolaena (L2). Ancestral character state reconstruction of achenial trichome morphology suggests that clades are homogeneous in terms of trichome type, but with exceptions that make it highly homoplastic. Conversely, our results suggest that the presence of myxogenic apical cells is less homoplastic and that closely related species tend to resemble each other more than expected under random variation.es_ES
Patrocinadordc.description.sponsorshipDahlem Centre of Plant Sciences (DCPS) Fondecyt-Chile 1150425 SYNTHESYS project European Community AC-TAF-2001 FR-TAF-1977 National Geographic Society National Science Foundation DEB-BSI-0071506es_ES
Publisherdc.publisherInternational Association for Plant Taxonomyes_ES
Type of licensedc.rightsAttribution-NonCommercial-NoDerivs 3.0 Chile*
Link to Licensedc.rights.uri*
Keywordsdc.subjectAchenial trichomees_ES
Keywordsdc.subjectLucilia groupes_ES
Keywordsdc.subjectSouth Americaes_ES
Títulodc.titlePhylogeny and evolution of achenial trichomes in the Lucilia group ( Asteraceae: Gnaphalieae ) and their systematic significancees_ES
Document typedc.typeArtículo de revistaes_ES
Indexationuchile.indexArtículo de publicación ISIes_ES

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