INVESTIGADORES
GIUSSANI Liliana Monica
congresos y reuniones científicas
Título:
Molecular phylogeny of Poa supersect. Homalopoa with emphasis in Austral sections
Autor/es:
GIUSSANI L.M. SCATAGLINI MM AA NEGRITTO M M. A. GILLESPIE LL JJ ANTON A A.R. REFULIO-RODRIGUEZ NN FF SORENG RR JJ
Lugar:
Bariloche
Reunión:
Congreso; VI Southern Connection Congress; Gondwana reunided: a southern perspective for a changing world; 2010
Institución organizadora:
Southern Connection
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.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.