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Because of the genetic basis of the cultivated species is too narrow,resulting in cotton in terms of yield,quality or stress resistance breeding stagnant.So it is necessary to adopt a variety of approaches,in particular explore good genes from wild species of cotton to enrich the genetic diversity of germplasm resources of cotton in China.G.darwinii belongs to tetraploid wild cotton,which has many good characteristics like good fibre fineness,drought resistance and verticillium wilt resistance.