Beck, James , Windham, Michael , Pryer, Kathleen M. .
Tempo and mode of evolution in the star-scaled cloak ferns (Astrolepis).
Polyploidy, or the presence of more than two chromosome sets per nucleus, is a pervasive feature of plant evolution. Most authors view the majority of angiosperms and up to 95% of the approximately 11,000 species of ferns to be polyploid. Additionally, polyploidy has been viewed as a challenge to phyletic gradualism, as genome doubling has the potential to produce both reproductive isolation and significant phenotypic change in a single generation. Groups which exhibit both diploids and polyploids therefore offer an opportunity to study both these processes. We have used nuclear and chloroplast sequence data to reconstruct the tree-like and reticulate relationships within the fern genus Astrolepis, which exhibits both diploids and an array of auto- and allopolyploids. These patterns offer insights into the frequency and timing of lineage formation by distinct evolutionary mechanisms.
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1 - Duke University, Department of Biology, 139 Biological Sciences Building, PO Box 90338, Durham, North Carolina, 27708, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Cottonwood D/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 4:30 PM