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Abstract Detail

Systematics Section

Hansen, Debra R. [1], Jansen, Robert K. [1], Sage, Rowan F. [2], Simpson, Beryl [3].

Phylogenies of Pectis and Porophyllum (Asteraceae, Tageteae) inferred from ITS and chloroplast sequence data.

Pectis is a genus of ~85 species of xeric-adapted annuals and herbaceous perennials which occur in arid habitats from Wyoming south to Argentina. The center of diversity for the genus lies in Mexico, home to ~54 species. The last comprehensive treatment of Pectis, done over 100 years ago, included only 34 species, thus nearly two-thirds remain unassigned to section, and we have little understanding of infrageneric relationships. Species of the genus are also known to utilize C4 photosynthesis, which is uncommon in the family. It has been assumed that Pectis is a C4 genus and Porophyllum (~30 ssp, its proposed closest relative), is a C3 genus, but of their combined ~115 species, only 32 have been surveyed for photosynthetic pathway. To date we have gathered new photosynthetic pathway data from 77 species. Here we present the phylogenies of Pectis and Porophyllum based on nuclear ribosomal DNA (ITS) and chloroplast sequence data, and examine the photosynthetic data in light of the phylogenies.

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Related Links:
Debra R. Hansen research

1 - University of Texas Austin, Section of Integrative Biology, 1 University Station, A6700, Austin, Texas, 78712-7640, USA
2 - University of Toronto, Ecology and Evolutionary Biology, 25 Willcocks Street, Toronto, ON, M5S 3B2, Canada
3 - University of Texas at Austin, Plant Resources Center and Section of Integrative Biology, 1 University Station A6720, Texas, 78712, USA

C4 photosynthesis

Presentation Type: Oral Paper:Papers for Sections
Session: 36
Location: 556A/Convention Center
Date: Tuesday, August 3rd, 2010
Time: 4:00 PM
Number: 36013
Abstract ID:443

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