INVESTIGADORES
SCATAGLINI Maria amalia
congresos y reuniones científicas
Título:
Molecular phylogeny of Poa supersect. Homalopoa with emphasis in Austral sections.
Autor/es:
GIUSSANI, LILIANA MÓNICA; SCATAGLINI, MARÍA AMALIA; NEGRITO, MARIA; GILLESPIE, LYNN; ANTÓN ANA; REFULIO RODRIGUEZ, NANCY; SORENG, ROBERT
Lugar:
Bariloche, Argentina
Reunión:
Congreso; VI Southern Connection Congress.; 2010
Institución organizadora:
Universidad Nacional del Comahue
Resumen:
Poa L. is one of the two largest genera of grasses with
more than 500 species worldwide. The genus has been extensively studied and
major phylogenetic relationships have been explored. Recently, it has been divided
into five subgenera and 28 sections. Poa is characterized by having different reproductive systems,
from hermaphroditism to dioecism. Most of the variations in floral arrangements
in Poa are concentrated in sections and informal
groups of Poa subg. Poa supersect. Homalopoa, and gynomonoecism, gynodioecism and
dioecism are frequent among species of America
and New Zealand.
To investigate relationships within the monophyletic supersect. Homalopoa and to look for trends in the evolution of
the reproductive system, we included more than a hundred species of supersect. Homalopoa. Several markers: ITS and ETS (nucleous),
and trnT-L-F, rpoA, and rpl16 (chloroplast) were sequenced and analysed using parsimony. Although
basal relationships are not resolved and there is little resolution within
major clades, several well-supported groups are recovered and discussed. Dioecism
would have appeared at least three times independenly within Homalopoa. Results confirmed the monophyly of Dioicopoa and two other dioecious clades with species
of Madropoa. Direct relationships among dioecious and
exclusively pistillate species are not supported. Gynomonoecism and gynodioecism
appear in at least six clades, and strictly pistillate apomicts appear several
times in different clades.