棉 花 学 报     Cotton Science   2008 ， 20(4) ： 289-294

Genetic and Correlation Analysis on Fiber Fineness-related Traits in Upland Cotton ( G.hirsutum )
SHAO Yan-hua，LI Jun-wen，TANG Shu-rong，LIU Ai-ying，SHI Yu-zhen，CHU Ping，SANG Wen-dong，MENG Jun-ting ，YUAN You-lu^*
(Cotton Research Institute of the Chinese Academy of Agricultural Sciences; Key Laboratory of Cotton Genetic Improvement, Ministry of Agriculture, Anyang, Henan 455000, China)

Abstract：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 fiber fineness related traits in the study. The results showed that fiber strength, length and uniformity were controlled by one or two major gene and poly genes. Micronaire was as an indication of both fineness (linear density) and maturity (degree of cell-wall development). The method of major gene plus polygene inheritance model with single segregating generation of F₂ or F_2:3 were used to analyze the traits of linear density and maturity ratio. The results showed that there was one major gene for linear density. And the correlation analysis indicated that it was possible to produce long, strong and uniform fibers with good elongation. Micronaire was positive significantly correlation with uniformity and the inconsistent correlation of two generations with length, strength and elongation. Maturity ratio was not significantly correlated with uniformity and the inconsistent correlation with other traits. Linear density was positive significantly correlated with uniformity, negative significantly with elongation and no signification with fiber length, strength and lint percentage. This indicated linear density was more stable than micronaire and maturity ratio, so it is necessary to strengthen the study of linear density.
Key words：upland cotton；fiber fineness；major gene；polygene；genetic correlation
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