Analysis of Combining Ability and Genetic Parameters of Major Characters in Mature Gossypium hirsutum L.
12 upland cotton(Gossypium hirsutum Linn.)varieties from different sources were selected as parent ma-terials.32(4×8)combinations were formulated based on incomplete diallel cross NCII design.Genetic effects,combining ability and heterosis of 13 main agronomy traits and quality traits of parent and F1 were statistical analy-sis.Results indicated that there were significant genetic differences between different hybrid combinations.Seed cotton yield,lint yield,boll weight,lint percent,fiber upper half mean length,fiber breaking strength,micronaire value and elongation rate were affected by both additive and non-additive effects of genes,bolls of per plant was focused on additive effect,while plant height,position of first fruit branch,height of first fruit branch and fiber uni-formity rate showed non-additive effects.W1(LZD)was a parent material with high yield and high boll weight,L2(Liaomian43)was a parent material with high yield and high lint percent,W6(19-ZHGC),W7(Zhong91)were high-quality parent materials,L2(Liaomian43)and W2(Xinshi K28)were the parental materials with better com prehensive characters.Combinations W1×L1(LZD×Liaomian38),W5×L3(Huiyuan720×Liaomian27)had greater potential for breeding new cultivars.Most of the traits have obvious heterosis,among which the competitive ad-vantages of lint and seed cotton yield are the largest,reaching 15.5％and 10.5％respectively,the average competi-tive advantages of fiber upper half mean length and breaking strength are 5.7％and 5.3％,respectively.These re-sults indicate that the utilization of heterosis can effectively increase cotton yield and improve fiber quality.
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