Hufft, Rebecca .
Multiple origins and widespread distribution of coexisting polyploids.
POLYPLOIDY is a central force structuring genetic diversity in angiosperms, yet its ecological significance is poorly understood. The minority cytotype exclusion theory predicts multiple cytotypes should not coexist; yet sympatric polyploids are not uncommon. This work investigates the mechanisms contributing to the coexistence of triploids and tetraploids in the perennial herb, Arnica cordifolia. Broadscale sampling establish that both triploids and tetraploids occur throughout the range of the species, with local scale sampling revealing the coexistence of both ploidies within the majority of sites. Molecular analyses support multiple triploidy events but reveal a lack of variation in the tetraploids. Reproductive isolation and habitat differentiation are explored as mechanisms for the frequent coexistence of the two cytotypes.
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1 - University of California, Department of Ecology and Evolutionary Biology, Earth & Marine Sciences Bldg., Santa Cruz, California, 95064, USA
minority cytotype exclusion theory
Presentation Type: Oral Paper:Papers for Sections
Date: Tuesday, August 1st, 2006
Time: 9:15 AM