Systematics Section / ASPT
Jolles, Diana , Wolfe, Andrea D. .
Biogeography and genetic divergence within the Pyrola picta species complex (Pyroleae: Monotropoideae: Ericaceae).
The Pyrola picta species complex (Pyroleae: Monotropoideae: Ericaceae) of western North America is composed of one to several species of small, rhizomatous plants that typically inhabit middle-to-high elevation, coniferous forests and exhibit notable levels of phenotypic plasticity. Leaf morphology, traditionally used for species circumscription in this complex, is characterized by nearly continuous variation in pigmentation, size, and shape. The confounding influence of plasticity in this group has masked the possible effects of mycoheterotrophy, geographic isolation over time, and large-scale ecological factors on genetic divergence within the complex. In this study, we examine genetic differentiation between 120 populations of allopatric and sympatric populations of Pyrola picta, Pyrola aphylla, and a few formerly recognized “morphotypes” across western North America using amplified fragment length polymorphism (AFLP) and nucleotide sequence polymorphism. The results of (1) cladistic analyses of whole-genome restriction site profiles and nucleotide sequence polymorphisms in non-coding nuclear and chloroplast regions, and (2) statistical analyses of both genetic and geographic distances support both exclusive and non-exclusive hypotheses about the dispersal and subsequent diversification within the Pyrola picta species complex.
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1 - Ohio State University, Department of Evolution, Ecology and Organismal Biology, 300 Aronoff Laboratory, 318 W. 12th Ave., Columbus, Ohio, 43210-1293, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lake Erie/Hilton
Date: Monday, July 9th, 2007
Time: 8:30 AM