QTL Mapping for Resistance to Ve rticillium wilt, Fiber Quality and Yield Traits in Upland Cotton (Gossypium hirsutum L.)
Yang Chang Guo Wangzhen Zhang Tianzhen~* National Key Laboratory of Crop Genetics and Germplasm Enhancement,Cotton Research Institute,Nanjing Agricultural University,Nanjing,210095
A Gossypium hirsutum L.line 5026 which was resistant to Verticillium wilt and a Ghirsutum cultivar Li 8 which was high susceptible to Verticillium wilt were used as parents to construct a RIL population.5 300 SSR primers were used to screen the polymorphism of the parents,totally 115 loci were obtained to analyze the RIL population and a molecular genetic linkage map covering 560.1 cM of the cotton genome and including 20 linkage groups was constructed.The family lines of the RIL were divided into two parts:one was planted in a pathogen nursery of Verticillium dahlia,to investigate the traits of resistance of each line at seedling and maturity stages;the other was planted in the field to investigate the traits related to the yield and fiber quality of each line.The QTL for the traits of resistance,yield and fiber quality was mapped using the composite interval mapping method.Three re- sistant QTL at seedling stage and one resistant QTL at maturity stage were detected and they can explained the variation of phenotype from 7.4% to 11.8%;two QTL for fiber length,two QTL for fiber strength,one QTL for micronaire,one QTL for fiber uniformity ratio,one QTL short fiber index and two QTL for fiber elongation were detected and they explained the variation ofphenotype from 6.7% to 15.7%;two QTL for lint yield,one QTL for seed-cotton yield,two QTL for the number of fruit branches per plant,one QTL for the number of bolls per plant, two QTL for boss size,one QTL for seed index,one QTL for lint percent,one QTL for lint index were detected and they explained the variation of phenotype from 4.1% to 10.6 %.These results might provide very important in- formation for the breeding of resistance to disease,yield and fiber quality of cotton.
【Fund】： 本研究由国家自然科学基金(30370899，30270806);; 教育部长江学者和创新团队发展计划(RT0432);; 科学技术重大研究项目(10418);; 江苏省自然科学基金(BK2007719)资助项目资助
【CateGory Index】： S562
【CateGory Index】： S562