INVESTIGADORES
URTUBEY estrella
congresos y reuniones científicas
Título:
Subfamily Barnadesioideae
Autor/es:
E. URTUBEY; T. F. STUESSY
Lugar:
San Pablo
Reunión:
Simposio; South American Compositae Meeting; 2011
Institución organizadora:
FAPEST
Resumen:
Subfamily Barnadesioideae (Asteraceae) Subfamily Barnadesioideae, 91 species in nine genera confined to South America, constitutes the smallest, youngest and basal group within upper-level Asteraceae classification. The lack of two cpDNA inversions present in all other Asteraceae, supported by the presence of axillary spines and three-celled uniseriated trichomes confirms a separated position from the rest of the family (ca. 23000 species). Current knowledge of the subfamily includes phylogenetic studies which are congruent with regard to the monophyly of the genera and some of their relationships such as Chuquiraga, Doniophyton and Duseniella; Arnaldoa, ArchiDasyphyllum and Fulcaldea; and Barnadesia—Huarpea pair. So far, unassigned position for the monotypic genus Schlechtendalia persists. Nuclear and morphological data indicate a basal position within the subfamily whereas chloroplast markers favor a sister relationship to Barnadesia and Huarpea. Another result (trnL intron) shows Schlechtendalia as sister to Chuquiraga and Doniophyton and as sister to the Arnaldoa-Fulcaldea-Archidasyphyllum clade using ITS. In short, to better understand the pampean Schlechtendalia, the next step is principally focused on the study of population genetics.