Molecular Ecology and Evolution
Parker, V. Thomas , Reading, Craig .
A test of cross-clade, allopolyploid origin for tetraploids in Arctostaphylos (Ericaceae).
Earlier research using ITS data suggests two large clades in the evolution of Arctostaphylos (Ericaceae, Arbutoideae). A third of the taxa in this genus, however, are tetraploid. One hypothesis proposed is that the tetraploids are of cross-clade hybrid origin. This is based on rates of hybridization observed in the field, allopatric distribution of taxa within a clade, and previous work establishing allopolyploid origin for two Sierra Nevada taxa, A. mewukka and A. truei. We used two nuclear single or low copy genes to develop allele trees for two coastal tetraploids, A. montana subsp. montana, and A. montana subsp. ravenii. Both taxa have been associated morphologically with species from both clades and are found in a region of high species diversity. These molecular data indicate alleles from taxa of both ITS clades, as well as non-overlapping sets of potential diploid parent lineages which could account for their morphological differences. Such data support the cross-clade hybridization hypothesis.
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1 - San Francisco State University, Department of Biology, 1600 Holloway Avenue, San Francisco, California, 94132
2 - San Francisco State University, Department of Biology, 1600 Holloway Avenue, San Francisco, CA, 94132, USA
Presentation Type: Oral Paper:Papers for Topics
Date: Tuesday, July 29th, 2008
Time: 2:15 PM