INVESTIGADORES
URTUBEY estrella
congresos y reuniones científicas
Título:
Phylogeny of Barnadesioideae: insights from additional molecular Data
Autor/es:
GRUNSTAUDL M.; T. F. STUESSY; E. URTUBEY
Lugar:
Barcelona. Espana
Reunión:
Simposio; The International Compositae Alliance; 2006
Institución organizadora:
TICA
Resumen:
Barnadesioideae: the ancient complex of Asteraceae     T. Stuessy1, E. Urtubey2, M. Grünstäudl1  1Departmentof Systematic and Evolutionary Botany, Faculty Center of Botany, University of Vienna, Austria 2Disión Plantas Vasculares, Museo de La Plata, Universidad Nacional de La Plata, Argentina   Barnadesioideae, the oldest lineage of Asteraceae, consist of nine genera and c. 90 species distributed in South America.  Although previously included within tribe Mutisieae, the group has been elevated to subfamily status based mainly on molecular data.  Microfossils and molecular clock estimates place the origin of the family at c. 30 million years, which makes Barnadesioideae interesting for patterns of character divergence, rates of evolutionary change, and biogeography.   Morphologically, it is a very diverse group that ranges from - herbs several cm high to lowland trees more than 20 m tall.  Variation in anther characters is also broad.  Such striking morphological divergence among genera has made phylogenetic reconstruction difficult.  Previous molecular phylogenies based on ITS and trnL intron sequences have revealed an hypothesis of relationships among genera, but this differs substantially from that from morphology.  We test these two contrasting hypotheses by (1) using parsimonious step changes in corolla morphology and vascularization, and (2) new molecular data from rbcL and matK.