| Random block experiment contained seven upland cotton parents which collectedfrom the Changjiang River Valley and their twelve F1 generations in NCⅡdesign.Economic traits and agricultural traits of every materials were investigated in the field.The experiment dates were conducted by using additive-dominant model(zhu,1997) andDPS analyzing soft in order to research genetic effects, combining ability, variance,correlation and so on. The results were as following:1. Performances of heterosis for upland cotton, the competitive heterosis of yield traitswere greatly different in all combinations. It included some greatly significant positivesuper standard heterosis and some negative effects. Through the analysis of yieldcomponents, the results showed that the difference of seed yield and lint yield wasdecided by difference of yield constitution characters in all hybrid combinations. The 12thcombination (MAr×Huakang 1) was the first both on seed yield and lint yield. Due toboll number of 12th combination was the highest in all combinations. So the yieldheterosis of 12th combination mainly came from boll number. Performance of heterosison fiber quality was rather not obvious and had little contribution to improve fiberquality.2. Results of analysis for genetic effects showed that seed yield and lint yield werecompletely controlled by additive effects. On the yield constitution, boll number,lintindex and lint percentage were mainly controlled by dominant effects. Boll weight andseed index were controlled by additive effects. Results of the most fiber quality ongenetic effects showed that fiber length, strength and micronaire were mainly controlledby additive effects. Fiber uniformity was partly controlled by additive effects and had notdominant effects, elongation were greatly controlled by dominant effects. In addition,environmental variance influenced greatly to yield and fiber quality.3. Analysis results of combining ability for parents and hybrid combinations indicatedthat on the yield characters, Emian 23 had better GCA and SCA in female parents andHuakang 1 performed better in male parents. On the fiber quality, GA18 in female andC12 in male were performed greatly, but owing to all combinations performed bad infiber quality, low fiber strength, high micronarie and bad fiber. Thus, some good varietieswere needed to improve the fiber quality in upland cotton. 4. Correlation analysis for yield traits and quality character had showed that there weresome different correlation among main economic traits. On the yield traits, the significantpositive correlation between boll weight, boll number and seed yield. While there wasobvious negative correlation between boll weight and boll number. On the fiberquality, the greatly positive significant correlation between fiber length, uniformity andfiber strength. While there was obvious negative correlation between fiber uniformity,strength and fiber elongation.5. Results of agricultural traits showed that superior agricultural traits were basic materialfor high and stable yield in cotton. Through different times to investigate mainagricultural traits, the results showed that the 3rd combination (Emian 23×Simian 1) and12th (MAr×Huakang 1) were performed great competitive heterosis on agricultural traits.So, the two combinations were foreseed to have a better yield heterosis.6. Identified results of resistance to disease showed that there were 1 combination of highresistance to Fusarium Wilts, 2 combinations of resistance to Fusarium Wilts, and theamount of resistance to Fusarium Wilts had reached to 23%. There were also 8combinations of tolerant to Fusarium Wilts; On the resistance to Vercillirium wilts, therewere only 6 combinations of tolerant to Vercillirium wilts. In addition, there were 2combinations that resistance to Fusarium Wilts and tolerance to Vercillirium wilts at themeantimes. They were 12th combination (MAr×Huakang 1) and 6th combination (Emian23×Ekang 11).
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