Genetic Analysis of Fruit Branch Type by Using Major Gene Plus Polygene Mixed Inheritance Analysis in Upland Cotton(Gossypium hirsutum L.)

Two F2 segregate population were constructed by unbounded fruit branch type and bounded fruit branch type.The method of joint analyses of multiple generations with P1,P2,F1 and F2 of major gene plus polygene mixed inheritance model was used to analyze the genetics of cotton fruit branch type.The results showed that cotton fruit branch type was controlled by two major gene with additive-dominance-epistasis effects plus polygenes and with accordance in two populations.Two major genes have additive effect mainly and there was epistatic dominance effects between two major genes.The correlation analysis indicated that unbounded branch plant was positive correlation with boll weight,seed cotton yield,fiber yield and growth period.