Systematics Section / ASPT
Kelso, Sylvia , Weitemier, Kevin , Bilodeau, Michelle , Beardsley, Paul .
Phylogeny of Primula sect. Parryi in the Intermountain and Rocky Mountain West: Perspectives from ITS, ETS, cpDNA and AFLP sequences.
PRIMULA sect. Parryi (Primulaceae) encompasses 8 taxa endemic to western North America. Five taxa (P. capillaris and P. cusickiana varieties cusickiana, maguirei, nevadensis, and domensis) are narrow endemics to azonal cool moist habitats primarily in the Great Basin. Primula rusbyi is restricted to mountain fronts of New Mexico, Arizona and Mexico, P. angustifolia to the southern Rockies in Colorado and New Mexico, and P. parryi is widespread throughout subalpine bogs of the Rocky Mountain and Intermountain West. To assess phylogenetic relationships among these taxa and their closest relatives in Primula and Dodecatheon, we employed nuclear ribosomal DNA sequences from the ITS (~700 bp) and the ETS regions (~450 bp) and combined these data with over 5700 bp of previously published chloroplast sequences. Data from the nuclear and chloroplast genomes were highly congruent and the addition of the nuclear data led to higher resolution of the relationships and increased bootstrap support for all nodes in the tree. Our results reveal that the four varieties of P. cusickiana together form a monophyletic group, with vars. domensis and nevadensis forming a well supported clade that is sister to the well supported clade of P. cusickiana var. cusickiana and var. maguirei. The closest relatives of P. cusickiana are P. capillaris and P. angustifolia, respectively. Primula rusbyi and P. parryi are strongly differentiated both genetically and morphologically. Primula parryi has a sister group relationship with the rest of the species in the section. In addition to DNA sequence data, we collected over 350 AFLPs for multiple populations and individuals from each taxon to explore infraspecific variation and further explore phylogenetic relationships among the taxa. The patterns of differentiation in P. cusickiana are consistent with a model of differentiation based on habitat fragmentation combined with niche conservatism. Biogeographic implications of the results are discussed.
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1 - Colorado College, Biology Department, 14 E. Cache La Poudre, Colorado Springs, Colorado, 80903, USA
2 - Idaho State University, Dept. of Biological Sciences, Campus Box 8007, Pocatello, Idaho, 83209, USA
Primula sect Parryi
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM