Comparative Genomics, Development, Physiology and Systematics of the Brassicaceae and Cleomaceae
Beilstein, Mark , Al-Shehbaz, Ihsan , Mathews, Sarah , Kellogg, Elizabeth .
Phylogeny and trichome evolution in the plant family Brassicaceae.
The plant family Brassicaceae is comprised of approximately 3700 species in 338 genera, and 25 recently delimited tribes based on ndhF phylogenetic results. Furthermore, the majority of genera sampled in the ndhF phylogeny fall into one of three major lineages (i.e., monophyletic clades comprised of several tribes and genera). To further assess the credibility of these lineages, and explore the monophyly of the recently delimited tribes, we inferred phylogeny from the nuclear gene phytochrome A (PHYA) for taxa previously sampled for the chloroplast gene ndhF. Trees inferred from ndhF, PHYA and combined ndhF/PHYA data were compared using the Shimodaira-Hasegawa test (S-H test). Both the PHYA and combined trees recover the three lineages first recovered in ndhF trees, and these lineages are the only well-supported nodes beyond the tribal level recovered in any phylogeny of the family. In addition, 13 of the 23 sampled tribes are monophyletic in PHYA trees, while the combined tree confirms the monophyly of 18 tribes. Using the resulting phylogenies to guide sampling, we also documented trichome branching pattern from species across the phylogeny using SEM and explored the evolution of different trichome morphologies using an assay of early trichome development.
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1 - Harvard University, Arnold Arboretum, Harvard University Herbaria, 22 Divinity Avenue, Cambridge, Massachusetts, 02138, USA
2 - Missouri Botanical Garden, Po Box 299, St Louis, Missouri, 63166-0299, USA
3 - University of Missouri St Louis, Department of Biology, 8001 Natural Bridge Road, St Louis, Missouri, 63121-4499, USA
Presentation Type: Symposium or Colloquium Presentation
Location: Stevens 2/Hilton
Date: Monday, July 9th, 2007
Time: 2:00 PM