Systematics Section / ASPT
Egan, Ashley N. , Sherman-Broyles, Sue , Doyle, Jeff J. .
Evolutionary Relationships Within Subtribe Glycininae (Leguminosae) Using Multiple Linked Nuclear Loci.
Current hypotheses of evolutionary relationships within Phaseoleae subtribe Glycininae (Leguminosae) remain tenuous, especially in reference to sister relationships of Glycine, which includes soybean (G. max). Past studies have focused on chloroplast data and found unresolved or weakly supported sister groups to Glycine, or suggested Teramnus or Pueraria montana var. lobata as its sister. We estimated phylogenetic relationships of subtribe Glycininae and related genera using seven nuclear genes that occur in a 1 megabase region of the soybean genome. Phylogenies were estimated under the Bayesian and Maximum Parsimony frameworks. We test morphological- and chloroplast-based subtribal classifications, and the competing hypotheses of Teramnus and Pueraria montana var. lobata as sister to Glycine using the Shimodaira-Hasegawa test within the likelihood framework. In addition, the use of these seven loci, tightly linked in Glycine and hypothesized to be linked in other Phaseoleae taxa, allows a unique study of phylogenetic incongruence in the nuclear genome. Specifically, we investigate the degree of incongruence across these genes, and explore the various processes and parameters that may contribute to incongruence.
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1 - Cornell University, L. H. Bailey Hortorium, Dept. of Plant Biology, 228 Plant Science, Ithaca, NY, 14853, United States
2 - Cornell University, Plant Biology, 228 Plant Sciences, Ithaca, NY, 14853, USA
3 - Cornell University, L.H. Bailey Hortorium, Department of Plant Biology, Ithaca, New York, 14853, USA
linked nuclear genes
Presentation Type: Oral Paper:Papers for Sections
Location: Stevens 3/Hilton
Date: Wednesday, July 11th, 2007
Time: 4:15 PM