Brokaw, Joshua , Hufford, Larry .
Allopolyploid Speciation in Edaphic Specialists:
Mentzelia mollis and M. packardiae are narrow endemics found on unusual substrates in the northern Great Basin. These substrates have been found to support a large number of rare endemics while excluding common components of surrounding vegetation. Assays of substrate chemical and physical properties reveal extremely high concentrations of sodium and potassium salts. Comparisons of habitat data for M. mollis and M. packardiae indicate significant ecological divergence from each other and from other extant members of Mentzelia section Trachyphytum. In agreement with their geographic proximity, phylogeny reconstructions based on plastic intergenic spacers and the low-copy nuclear gene isocitrate dehydrogenase suggest that M. mollis is one of two progenitors of M. packardiae through allopolyploidization. Further, this suggests that despite its specialization and rarity, the genome of M. mollis has contributed to the evolution of M. packardiae as a new species with unique adaptations.
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1 - Abilene Christian University, Biology Dept, Abilene Christian University, ACU Box 27868, Abilene, TX, 79699-7868, USA
2 - Washington State University, SCHOOL OF BIOLOGICAL SCIENCES, 312 Abelson Hall, PULLMAN, WA, 99164-4236, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Forsyth Room/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 11:00 AM