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ARS Home » Midwest Area » Ames, Iowa » Corn Insects and Crop Genetics Research » Research » Publications at this Location » Publication #135443
Title: POLYPLOID EVOLUTION IN GLYCINE

Author
item BROWN, A - CSIRO
item Palmer, Reid
item DOYLE, J - CORNELL UNIVERSITY
item RAUSCHER, J - CORNELL UNIVERSITY
item DOYLE, J - CORNELL UNIVERSITY

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 7/3/2002
Publication Date: 7/3/2002
Citation: BROWN, A.H., PALMER, R.G., DOYLE, J.L., RAUSCHER, J., DOYLE, J.J. POLYPLOID EVOLUTION IN GLYCINE. MEETING ABSTRACT. 2002. Abstract No. 136.

Interpretive Summary:

Technical Abstract: Strategies for the conservation and use of the wild genetic resources of crops should rest on knowledge of the evolutionary processes and relationships among their related species. The soybean genus Glycine has two subgenera, subg. Soja (which includes the crop species G. max) and subg. Glycine. The latter subgenus consists of 20 named perennial species and has diversified extensively throughout Australia. Two of these species (G. tomentella and G. tabacina) are widespread complexes containing diploid and polyploid cytotypes. Comparison of these allopolyploid complexes, their diversity, origins and distribution provides hypotheses on the success they have had in spreading to a diversity of habitats. Recent DNA sequence information for the single-copy nuclear histone H3D locus has confirmed and greatly extended earlier evidence from hybrid cytogenetic analyses, isozyme polymorphisms, 5S-RNA, chloroplast RFLPs and 18S-26S ribosomal gene (nrDNA) ITS sequences concerning the multiple origins of these polyploid complexes. The H3D sequence identity argues that for these lineages, both polyploidy and its subsequent spread to the western Pacific have happened within 30,000 years. Most H3-D alleles in the polyploids are identical or closely related to alleles in diploids, suggesting recency of origin and spread. One further twist is that one race in each of the tetraploid species complexes (G. tabacina race AB¿, and G. tomentella race T2) share the same putative donor (G. tomentella D4 for both), linking the two in a higher order complex.