Abstract:

In order to exploit elite genes from Gossypium mustelinum so as to improve fiber quality of Upland cotton (G. hirsutum), a set of advanced backcross population was constructed by interspecific crossing between G. mustelinum and G. hirsutum. Based on marker-assisted selection and identification of fiber quality performance, three near-isogenic lines (NILs) were selected from this set of advanced backcross population, which had almost the same genetic background as the recurrent G. hirsutum parent, except for a few introgression segments of G. mustelinum mainly distributed on chromosome 1, chromosome 14 and chromosome 19. The NILs had elite fiber strength and fiber fineness, which provided great opportunities to detect QTLs controlling fiber strength and micronaire value via fine mapping; meanwhile, these NILs could be released as germplasm to improve fiber strength and fineness in cotton breeding.