. A molecular phylogeny of Pennisetum and Cenchrus (Poaceae) based on the trnL-F, rpl16 chloroplast markers

DONADÍO, S., GIUSSANI, L.M., KELLOGG, E.A., ZULOAGA, F.O. & O. MORRONE

San Isidro, Buenos Aires

Otro; VII Reunión Argentina de Cladística y Biogeografía; 2007

Informative gaps corresponding to indels were treated as missing data, although they were coded as binary characters following the "simple indel coding" method (Simmons & Ochoterena, 2000). Jackknife and Bremer support were used to estimate branch support. The ingroup included twenty species of Pennisetum and seven species of Cenchrus. The outgroup included a total of ten species of subfamily Panicoideae: six species belonging to the "Bristle Clade"; three species of the Paniceae x = 9 clade, and one species of the tribe Andropogoneae. One species of subfamily Centothecoideae was used as root for the analyses. Geographical, chromosomal and morphological characters of taxonomic interest were optimized onto the molecular phylogeny. In agreement with previous studies (Gómez-Martínez & Culham, 2000; Zuloaga et al., 2000; Duvall et al., 2001; Giussani et al., 2001; Doust & Kellogg, 2002; Doust et al., 2007), our results suggest that all species of Pennisetum and Cenchrus belong to the "Bristle Clade", although none of them are monophyletic. Within the Bristle clade, PennisetumPennisetum and seven species of Cenchrus. The outgroup included a total of ten species of subfamily Panicoideae: six species belonging to the "Bristle Clade"; three species of the Paniceae x = 9 clade, and one species of the tribe Andropogoneae. One species of subfamily Centothecoideae was used as root for the analyses. Geographical, chromosomal and morphological characters of taxonomic interest were optimized onto the molecular phylogeny. In agreement with previous studies (Gómez-Martínez & Culham, 2000; Zuloaga et al., 2000; Duvall et al., 2001; Giussani et al., 2001; Doust & Kellogg, 2002; Doust et al., 2007), our results suggest that all species of Pennisetum and Cenchrus belong to the "Bristle Clade", although none of them are monophyletic. Within the Bristle clade, PennisetumCenchrus. The outgroup included a total of ten species of subfamily Panicoideae: six species belonging to the "Bristle Clade"; three species of the Paniceae x = 9 clade, and one species of the tribe Andropogoneae. One species of subfamily Centothecoideae was used as root for the analyses. Geographical, chromosomal and morphological characters of taxonomic interest were optimized onto the molecular phylogeny. In agreement with previous studies (Gómez-Martínez & Culham, 2000; Zuloaga et al., 2000; Duvall et al., 2001; Giussani et al., 2001; Doust & Kellogg, 2002; Doust et al., 2007), our results suggest that all species of Pennisetum and Cenchrus belong to the "Bristle Clade", although none of them are monophyletic. Within the Bristle clade, PennisetumPennisetum and Cenchrus belong to the "Bristle Clade", although none of them are monophyletic. Within the Bristle clade, PennisetumPennisetum and Cenchrus form, with the exception of P. lanatum, a well-supported group. Pennisetum is revealed as a polyphyletic genus because it includes species of Cenchrus. The Pennisetum-CenchrusCenchrus form, with the exception of P. lanatum, a well-supported group. Pennisetum is revealed as a polyphyletic genus because it includes species of Cenchrus. The Pennisetum-Cenchrus, a well-supported group. Pennisetum is revealed as a polyphyletic genus because it includes species of Cenchrus. The Pennisetum-CenchrusCenchrus. The Pennisetum-Cenchrus clade showed an independent reduction (x = 5, 7, 8) or duplication (x = 17) of the basic chromosome number from the ancestral x = 9. Within Pennisetum, sections Pennisetum and Gymnotrix, sections Pennisetum and Gymnotrix are polyphyletic.