Hernandez Leon, Sergio , Pérez de la Rosa, Jorge A. , Jardón Barbolla, Lev O. , Gernandt, David S. .
Phylogenetic relationships of Pinus section Trifoliae based on chloroplast DNA sequences.
Pinus section Trifoliae (the North American Hard pines) includes approximately 50 species classified in three subsections, Australes, Contortae, and Ponderosae. The species of the section are widely distributed throughout the New World from Canada to Nicaragua, and on the Caribbean islands. Phylogenetic relationships within the section were inferred from a concatenated chloroplast DNA matrix consisting of the coding regions matK, rbcL, and a 5' fragment of ycf1, and the intergenic spacers trnH-psbA, and trnD-trnY-trnE. An average of two individuals per species were included, together with outgroups P. resinosa and P. thunbergii of section Pinus. Optimal cpDNA trees recover
subsections Australes and Ponderosae as sister groups, which in turn are sister to subsection Contortae. Two occasionally recognized subsections, “Attenuatae” and “Sabinianae”, are resolved as monophyletic within the subsection Australes and Ponderosae clades, respectively. Species nonmonophyly is common in the cpDNA tree; we attribute this to a combination of slow cpDNA coalescence and hybridization.
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1 - Instituto de Biología, Universidad Nacional Autonoma de Mexico, Departamento de Botánica, A. p. 70-367, Mexico, D.F., 04510, Mexico
2 - Universidad de Guadalajara, Instituto de Botánica, Ap 139, Zapopan, Jalisco, 45110, México
3 - Instituto de Ecología, Universidad Nacional Autónoma de México, Ecología Evolutiva, A.p. 70-275, México, D.F., 04510, México
4 - Instituto de Biología, Universidad Nacional Autónoma de México, Botánica, A.p. 70-233, México, D.F., 04510, México
Presentation Type: Poster:Posters for BSA Sections
Location: Event Tent/Cliff Lodge
Date: Monday, July 27th, 2009
Time: 5:30 PM