Submitted to: Plant and Animal Genome Conference
Publication Type: Abstract Only
Publication Acceptance Date: 1/17/1999
Publication Date: N/A
Citation: YU, J., KOHEL, R.J. COTTON GENOME MAPPING AND APPLICATIONS. PLANT AND ANIMAL GENOME CONFERENCE. 1999. ABSTRACT P. 60.
Technical Abstract: The current status of our USDA cotton genome research projects will be reviewed. We will discuss molecular mapping and characterization of genes controlling fiber quality properties (strength, length, and fineness) in both extra long staple (ELS) cotton (Gossypium barbadense L.) and Upland cotton (G. hirsutum L.). QTLs for fiber quality properties in two Upland cottons, Acala accession HS427-10 and Pee Dee accession PD6992, will be compared with those of ELS cotton 3-79, with regard to their locations and gene effects. Genomic localization of major genes controlling simple inherited traits include Gle2 for glandless cotton, Se for photoperiod sensitivity, im for immature fiber, Li for lintless cotton, and Lc for lint color. Among these major genes, Gle2 is currently targeted for high-resolution mapping and positional cloning. Molecular characterization of Gossypium germplasm with DNA markers is another area of our USDA genome program. An initial set of 155 land races and cultivars have been examined with 60 DNA markers selected from different chromosomes or linkage groups of the cotton genome. About six thousand additional Gossypium accessions from Russia are being added to our existing collection of the same number. A large effort will be required for molecular assessment and establishment of their unique identity relative to our current collection. Recommendation to further utilization of Gossypium germplasm resources will be made according to the level of uniqueness of the DNA marker profiles.