[Objective]Understand the cotton boll and fiber quality traits and their correlation of island-upland hybrid long-staple cotton to provide references for breeding high yield island-upland hybrid long-staple cotton.[Methods]New hybrid combinations of island-upland cotton were developed using self-selected insect-resistant upland cotton germplasm line as female parent,and production promoted and applied Xinjiang long-staple island cotton variety as male parent.The cotton boll traits,fiber quality traits and the correlations of the F1 of the 23 island-upland hybrid cotton combinations were analyzed.[Results]In the 23 island-upland hybrid cotton combinations,the variation range of F1 single boll weight was 3.7-5.0 g.12 combinations had single boll weight over 4.2 g,with a 9.0%coefficient of variation.The variation range of lint percentage was 20.1%-36.7%.5 combinations had lint percentage over 30.0%,with a 10.7%coefficient of variation.The variation range for fiber length was 34.5-38.5 mm.22 combinations had fiber length over 35.0 mm,with a 2.6%coefficient of variation.The variation range of fiber specific strength was 34.8-41.8 cN/tex.9 combinations had fiber specific strength over 39.0 cN/tex,with a 5.3%coefficient of variation.The variation range of micronaire value was 2.8-4.2.There were 10 combinations with A-level micronaire value and a coefficient of variation of 11.8%.The single boll weight of the island-upland hybrid cotton was extremely significantly(r=-0.683**)negatively correlated with the sterile seed rate,extremely significantly(r=0.660**)positively correlated with seed numbers per capsule and significantly(r=0.495*)positively correlated with capsule numbers per boll.The fiber uniformity of the island-upland hybrid cotton was extremely significantly(r=0.578**,r=0.639**)positively correlated with fiber length and fiber specific strength,and significantly(r=0.506*)positively correlated with elongation rate.Lint percentage was significantly(r=-0.475*)negatively correlated with fiber length.Among 23 island-upland hybrid cotton combinations,W042×Xinhai No.53,W046×Xinhai No.54 and W047×Xinhai No.54 showed simultaneous improvement of cotton boll traits and fiber quality traits.[Conclusion]The simultaneous improvement of yield and fiber quality traits of long-staple cotton can be realized by utilizing the complementary heterosis crossing upland cotton with long-staple island cotton.
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