Butler, Emily Y. , Givnish, Thomas J. .
In the Light of Evolution: A Proposal to Integrate Phylogeny and Ecophysiology in New World Dryopteris.
The wood ferns (Dryopteris: Dryopteridaceae) include ca. 250 species and have a nearly cosmopolitan distribution. Members of this genus vary widely in morphology and habitat and hybridize readily. There has been much study of the East Asian and Hawaiian species of Dryopteris, but little is known about the North American and Neotropical taxa. Work is currently underway to construct a molecular phylogeny for Dryopteris worldwide, using DNA sequences of chloroplast and single-copy nuclear genes. Our initial focus is on collecting and sequencing the allopolyploid and putative parental taxa in North America, and future collection of the Central and South American taxa will lead to creation of a molecular phylogeny for all of New World Dryopteris. This phylogeny will facilitate reconstruction of the biogeographic history of the North American taxa and analysis of the hypothesis regarding putative reticulate evolution among the North American species. It will also be used to structure studies of the significance of morphological and physiological divergence among the North American species with respect to leaf shape and length, leaf orientation, leaf hydraulic conductance, and photosynthetic light response, and to see whether there has been a tendency for conductance, carbon uptake, and light levels to vary together over evolutionary time
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1 - University of Wisconsin-Madison, Department of Botany, 430 Lincoln Drive, Birge Hall, Madison, WI, 53706, USA
2 - University of Wisconsin Madison, Department of Botany, Birge Hall, 430 Lincoln Drive, Madison, Wisconsin, 53706-1381, USA
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM