Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/31/2004
Publication Date: 10/31/2004
Citation: Ulloa, M., Stewart, J.M., Park, Y.H., Murillo, P.N., Gaytan, A.M., Acosta, S.N. 2004. Comparison of geographical and genetic diversity revealed by microsatellites for the arborescent (D genome) Gossypium species from western states of mexico.. ASA-CSSA-SSSA Annual Meeting Abstracts. p. XXX.
Technical Abstract: We have observed considerable morphological variation among the arborescent Gossypium species of Mexico, especially G. aridum, the most widely distributed as currently circumscribed. These observations suggest the need for closer examination of the diversity within these taxa. Microsatellites are useful for estimating genetic relationships, examining collections with different taxonomical levels, and analyzing speciation. A set of selected microsatellite markers (130) were used to assess recent collections (54) of wild diploid Gossypium species from seven western states of Mexico, and an additional 8 accessions of species to insure inclusion of representatives of all 6 taxonomic subsections of the subgenus Houzingenia (D genome). Estimates of genetic similarities among all taxa showed extensive allelic diversity for this genome. Phenetic trees (Jackknife, BootStrap, and UPGMA) based on genetic similarities, as measured by microsatellite diversity, produced clades consistent with current taxonomic species delineations. However, the topology of the consensus tree also revealed clades that suggest additional undocumented relationships within the D genome.