Systematics Section / ASPT
Zacharias, Elizabeth H. , Baldwin, Bruce G. .
Molecular Phylogenetic Analysis of American Atriplex (Chenopodiaceae).
A phylogenetic investigation of Atriplex (Chenopodiaceae) is underway to examine evolutionary patterns, historical biogeography, life-form shifts, and ecophysiological change in the North American lineages (ca. 62 species), with an emphasis on Californian diversity (ca. 37 species, including eight endemics). Necessary limits on taxonomic and gene sampling in previous analyses have left relationships within Atriplex incompletely understood. Expanded molecular phylogenetic sampling of North American members of Atripliceae suggest that neither Atriplex, as traditionally recognized, nor the North American taxa are monophyletic groups. American taxa may represent two distinct lineages with different photosynthetic pathways. American Atriplex taxa with the C3 photosynthetic pathway and some other American C3 Atripliceae taxa may constitute a clade. Life-form evolution in North American Atriplex has been dynamic, with multiple, independent shifts between perennial and annual habits. Exploration of additional taxa and gene regions is being pursued.
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1 - University of California, Berkeley, Department of Integrative Biology, University and Jepson Herbaria, 1001 Valley Life Sciences Bldg. #2465, Berkeley, California, 94720, USA
C3 photosynthetic pathway
C4 photosynthetic pathway.
Presentation Type: Oral Paper:Papers for Sections
Date: Monday, July 31st, 2006
Time: 10:15 AM