INVESTIGADORES
CHIAPELLA Jorge Oscar
artículos
Título:
A molecular phylogenetic study of Deschampsia (Poaceae: Aveneae) inferred from nuclear ITS and plastid trnL sequence data: support for the recognition of Avenella and Vahlodea
Autor/es:
CHIAPELLA, J.
Revista:
TAXON
Editorial:
IAPT
Referencias:
Lugar: Viena; Año: 2007 vol. 56 p. 55 - 64
ISSN:
0040-0262
Resumen:
The circumscription and phylogeny of Deschampsia were studied for the first time by parsimony analysis of
nuclear ribosomal internal transcribed spacer (ITS) and plastid trnL intron sequences. The traditional sectional
division based on morphology was not supported by sequence data, which showed differences between core
Deschampsia s.str. (mainly represented by D. cespitosa), D. atropurpurea and D. flexuosa. Differences in
the ITS marker included insertions in the sequence of D. atropurpurea; the trnL marker contained a deletion
shared by all Deschampsia sequences, excluding D. atropurpurea and D. flexuosa, and an insertion in D.
flexuosa. ITS sequences also differed in an insertion shared by Northern Hemisphere accessions. Both markers
produced similar tree topologies but D. klossi, in spite of being morphologically close to Deschampsia s.str., fell
with D. flexuosa outside the core of the genus in the trnL tree. Molecular evidence corroborates morphological
and cytological data supporting exclusion of D. atropurpurea and D. flexuosa from Deschampsia and their
treatment as separate genera. The position of D. klossi needs further investigation.