Introgression of Gossypium barbadense L. into Upland cotton germplasm RMBUP-C4S1
Gossypium barbadense L. cotton has significantly better fiber quality than Upland cotton (G. hirsutum L.); however, yield and environmental adaptation of G. barbadense is not as wide as Upland. Most cotton in the world is planted to Upland cultivars. Many attempts have been made, over a considerable number of years, to introgress fiber quality alleles from G. barbadense into Upland. However, introgression barriers, primarily in the form of interspecific incompatibility, have limited these traditional approaches. The use of chromosome substitution lines (CSL) as a bridge should provide a more efficient way to introgress alleles from G. barbadense into Upland. We crossed 18 G. barbadense CSL to three cultivars and developed a random mated population. After five cycles of random mating followed by one generation of self-pollination to increase the seed supply, we grew the random mated population and used 139 G. barbadense chromosome specific SSR markers to assess a random sample of 96 plants for introgression. We recovered 121 of 139 marker loci among the 96 plants. The distribution of the G. barbadense alleles ranged from 10 to 28 alleles in each plant. Among the 96 plants we found individual plants with marker loci from 6 to 14 chromosomes or chromosome arms. Identity by descent showed little relatedness among plants and no population structure was indicated by a heat map. Using CSL we were able to develop a mostly Upland random mated population with considerable introgression of G. barbadense alleles which should be useful for breeding.
KeywordsChromosome substitution lines Cotton Gossypium barbadense × Gossypium hirsutum interspecific cross Interspecific introgression Upland cotton
Chromosome substitution line
Chromosome substitution line from G. barbadense L.
Multi-parent advanced generation inter-cross
Recombinant inbred lines
Joint contribution of USDA, ARS, Mississippi State, MS, Mississippi State University, and Cotton Incorporated, Cary, NC. In cooperation with Mississippi Agricultural and Forestry Experiment Station. Received April 5, 2018. This research was supported in part by a Grant (09-541) from Cotton Incorporated, Cary, NC. USDA is an equal opportunity provider and employer. Mention of trade names, brand names, trademark, proprietary product, or vendor does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products or vendors that may also be suitable.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest. Don Jones is an employee of Cotton Incorporated.
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