Systematics Section / ASPT
Doyle, Jeff J. , Doyle, Jane L. , Rauscher, Jason T. , Brown, A. H. D. .
Nuclear gene and cpDNA phylogenies at the boundary of phylogeny and tokogeny: Resolving relationships in the Glycine (Leguminosae) A-genome complex.
The Glycine subgenus Glycine A-genome group comprises eight named diploid species, originally united based on interfertility in artificial crosses. A-genome taxa are geographically dispersed throughout Australia, and occur in a wide range of habitats. Variation at three low copy nuclear genes (histone H3-D and two un-annotated intron-containing genes) and nrDNA ITS is largely consistent with species delimitations, with the exception of the morphologically complex G. clandestina. Nuclear genes consistently identify infraspecific groupings in the widespread G. canescens. Species phylogenies are at best weakly supported by any single gene, making it difficult to hypothesize the history of speciation in the group. Taking into account weak support, all four nuclear genes tell similar stories, although nrDNA ITS is an outlier both with respect to the greater amount of recombination (e.g., loops in networks) and in suggested relationships of some taxa. Chloroplast haplotype relationships based on four chloroplast non-coding regions show quite different patterns from the nuclear genes, and taxa with monophyletic nuclear gene alleles often have unrelated chloroplast haplotypes. These results emphasize the difficulties inherent in working with species that, although morphologically and ecologically differentiated, are interfertile and recently diverged.
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1 - Cornell University, L.H. Bailey Hortorium, Department of Plant Biology, Ithaca, New York, 14853, USA
2 - University of Puerto Rico, Rio Piedras, Department of Biology, P.O. Box 23360, San Juan, PR, 00931-3360, PR
3 - CSIRO Plant Industry, Centre for Plant Biodiversity Research, Canberra, Australian Capital Territory, Australia
Presentation Type: Oral Paper:Papers for Sections
Location: Stevens 3/Hilton
Date: Wednesday, July 11th, 2007
Time: 4:30 PM