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.