Systematics Section / ASPT
Pleines, Thekla , Jakob, Sabine S. , Blattner, Frank R. .
Phylogeographic patterns in the western North American Hordeum brachyantherum group (Poaceae).
IN the frame of phylogeographic studies covering the entire genus Hordeum we studied the chloroplast patterns in North American H. brachyantherum (2x and 4x) and its tetraploid allies (H. jubatum and H. depressum). We created a haplotype network based on sequences of the chloroplast trnL-F region. The results show that although the species share many chloroplast haplotypes these reflect different histories, and the distribution patterns for the shared haplotypes differ between the species. Hordeum jubatum has its highest chloroplast diversity in northwestern North America, where it possibly originated and/or survived the last ice age. Hordeum brachyantherum shows a contrasting pattern with high chloroplast diversity in the western United States, especially in California, whereas the diversity is low in Alaska. This indicates an ice age refuge of this species further south than H. jubatum. For H. depressum we can currently draw no conclusions, as the few samples of this species included up to now might not be representative.
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1 - IPK Gatersleben, Taxonomy & Evol. Biology, Gatersleben, D-06466, Germany
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM