Working group session:
Functional Genomics
Presentation type:
oral
Authors:
Zhang, Tianzhen
Presenter:
Zhang, Tianzhen
Correspondent:
Zhang, Tianzhen
Abstract:
Upland and Sea Island cotton are two cultivated tetraploid cotton varieties. Upland cotton (Gossypium hirsutum L.) is characterized by its high yield and moderate fiber quality performance, while Sea Island cotton (G. barbadense L.) as its low yield, increased fiber fineness and strength. Chromosome segment introgression lines (CSIL) consist of a battery of near-isogenic lines covering whole genome of crop. Except for one homozygous chromosome segment transferred from donor parent each line, the remaining parts of genome are the same as the recipient parent. It is an ideal material for genome research and especially for QTL mapping. Based on our high dense linkage map constructed between G. hirsutum × G. barbadense, G. barbadense cotton chromosome segment introgression lines in background of genetic standard line of Upland cotton TM-1 were developed with microsatellite assisted backcross. QTLs were mapped by CSIL population. An analysis of variance of the fiber quality traits based on the data from four environments was conducted. A total of 53 additive QTL and 4 epistatic QTL for yield, and 43 additive QTL and 6 epistatic QTLs associated with fiber qualities were detected. Although these QTLs are distributed on all chromosomes, we detected several clustered QTL regions, suggesting the relationship between yield and fiber quality between G. hirsutum and G. barbadense. There were 10 FL QTL, 16 FS QTL and 17 FM QTL based on values from four different environments. The CSILs created and the analyses presented here will enhance the understanding of the genetics of long staple fiber quality traits in G. barbadense and facilitate further molecular breeding of Upland cotton cultivars.