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URTUBEY estrella
artículos
Título:
AFLP PHYLOGENY OF SOUTH AMERICAN SPECIES OF HYPOCHAERIS (ASTERACEAE, LACTUCEAE)
Autor/es:
K. TREMETSBERGER; T. F. STUESSY; G. KADLEC; E. URTUBEY; C. M. BAEZA; S. G. BECK; H. C. VALDEBENITO; C. F. RUAS; N. I. MATZENBACHER
Revista:
SYSTEMATIC BOTANY
Editorial:
American Society of Plant taxonomists
Referencias:
Lugar: US; Año: 2006 vol. 31 p. 610 - 626
ISSN:
0363-6445
Resumen:
Hypochaeris is thought to have arrived in South America by dispersal over the Atlantic Ocean from NW Africa during the Pliocene or Pleistocene. We used amplified
fragment length polymorphism (AFLP) to unravel specific limits and
relationships in the South American group of Hypochaeris
(c. 45 species). The Moroccan endemic Hypochaeris angustifolia, which is sister to the entire South American group, was used as
outgroup. Our AFLP analysis comprises 415 individuals from 32 South American
species and is based on six primer combinations with 670 fragments scored. It
provides important information for the delimitation of species and detection of
closely related species pairs or groups. Most species are monophyletic and
supported with > 90 % bootstrap proportion. Hybridization is suggested
between Hypochaeris chillensis and H. microcephala in Brazil. The basal nodes (or backbone) of the tree are not highly supported,
but six major phylogenetic groups (also showing similarity in distribution and
growth form) center around Hypochaeris
apargioides, H. chondrilloides,
H. microcephala, H.
pampasica, H. sessiliflora, and H. tenuifolia. These results
suggest that rapid migration into different geographical regions played an
important role in the initial diversification of Hypochaeris in South America.