INVESTIGADORES
ZULOAGA Fernando Omar
artículos
Título:
Phylogenetic relationships in the genus Paspalum (Poaceae: Panicoideae: Paniceae): An assessment of the Quadrifaria and Virgata informal groups
Autor/es:
GIUSSANI, L.M., ZULOAGA, F.O., QUARÍN, C.L., COTA-SÁNCHEZ, H., UBAYASENA, K. & O. MORRONE
Revista:
SYSTEMATIC BOTANY
Editorial:
AMER SOC PLANT TAXONOMISTS
Referencias:
Año: 2009 vol. 34 p. 32 - 43
ISSN:
0363-6445
Resumen:
Abstract Paspalum , an American genus of the x = 10 Paniceae clade, includes about 330 species, four subgenera, and 27 informal groups.
Within the genus, the Quadrifaria and Virgata groups are well-represented in South and Central America. Interspecific variability make the
delimitation of these groups difficult; hence several species have been included or excluded from Quadrifaria or Virgata depending on the taxonomic
treatment. In previous analyses, the Quadrifaria and Virgata groups of Paspalum were polyphyletic. Here we present a new appraisal of
the classification of both groups based on the phylogenetic analyses of DNA data from the chloroplast: the rpl16 intron, and the region comprising
the trnL and trnF genes. A monophyletic Virgata clade is recovered, consisting of nearly all the species listed in an unpublished manuscript.
The Quadrifaria group is restricted to P. quadrifarium and P. quarinii . Other clades grouped species traditionally treated within Virgata
or Quadrifaria, although their phylogenetic placement needs to be reevaluated. Within most of the clades, diploid and polyploid species seemingly
derive from a common ancestor denoting an autopolyploid origin. Alloploidy is also possible although reticulate evolution needs to be
explored. The wide distribution of the I genome suggests that this is a plesiomorphic state in Paspalum .
Keywords chromosome numbers , genome type , phylogeny , rpl16 , trnL trnF.