|STEWART, JAMES MCD.|
Submitted to: Plant and Animal Genome Conference
Publication Type: Abstract Only
Publication Acceptance Date: 10/11/2007
Publication Date: 1/10/2008
Citation: Kantartzi, S.K., Ulloa, M., Sacks, E., McD. Stewart, J. 2008. Association mapping of fiber quality traits in Gossypium arboreum accessions. Plant and Animal Genome XVI Conference. p. 278.
Technical Abstract: Application of association mapping to germplasm resources has a potential to revolutionize plant genetics. Information about the genome distribution of linkage disequilibrium (LD) is of fundamental importance for association mapping. In addition, genetic diversity is desirable for long-term crop improvement and reduction of vulnerability to important crop stresses. Unless methods are improved to transfer useful allelic variation from diverse germplasm resources to the primary cotton breeding gene pool, cotton germplasm resources will remain largely under-utilized. Transfer of desirable genes through introgression from germplasm resources of other Gossypium species could play an important role in increasing genetic variability in Upland cotton. Gossypium arboreum (A2A2) is an invaluable gene pool for improving modern cotton cultivars. By studying the genetic relationships between strains of A-genome cotton from various ecological regions, it is possible not only to establish a theoretical basis for conserving diploid cotton germplasm resources, but also to target and improve certain ideal characteristics such as fiber quality. The main objectives of this study were to (1) investigate genetic diversity within germplasm groups of Gossypium arboreum from ten different areas of the world; (2) determine the phenotypic diversity within the populations; (3) investigate the genomic distribution of LD between pairs of SSR markers linked to phenotypic variation; and (4) determine the utility of genome-wide association mapping of fiber quality traits in evaluating G. arboreum accessions. Outcomes of this research should be useful in decreasing redundancy of effort and in constructing a core collection of G. arboreum, important for efficient use of this genetic resource in cotton breeding.