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Abstract Detail


Systematics Section

Beck, James [1], Windham, Michael [1], Pryer, Kathleen M. [1].

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

Keywords:
polyploidy
Astrolepis
reticulation
hybridization
apomixis.

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 46
Location: Cottonwood D/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 4:30 PM
Number: 46014
Abstract ID:166


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