棉 花 学 报       Cotton Science     2009，21(5)：356-360

Correlation Analysis on Fiber Fineness-related Traits in Advanced Backcross Lines between Upland Cotton ( G.hirsutum L.) and Island Cotton (G.barbadense L.)
LI Lian，SHI Yu-zhen，LI Jun-wen，TANG Shu-rong, LIU Ai-ying，YU Ji-wen，CHU Ping，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 stable BC₂F_4:6, BC₂F_4:7lines, which were obtained from combination between 34B and Giza70 and backcrossed with 34B as recurrent parent, were used to analyse the correlation of fiber fineness related traits under three environments. The results showed：firstly, spinning uniformity index was significantly positive correlated with fiber length, uniformity and strength; significantly negative correlated with elongation. Fiber length was significantly positive correlated with strength, significantly negative correlated with elongation. And the correlation analysis indicated that it was possible to produce long, strong and good elongation fiber. Secondly, micronaire tested by HVI 900 was significantly negative correlated with strength and spinning uniformity index, maturity ratio was significantly positive correlated with micronaire, significantly negative with fiber linear density and maturity ratio were inconsistently correlated with other fiber traits under three environments. Fiber linear density was significantly positive correlated with spinning uniformity index, significantly negative correlated with length and strength, not significant with fiber uniformity, and negative with elongation. These indicated that linear density was more stable than micronaire and maturity ratio, so it is necessary to strengthen the study of linear density.
Key words：G .hirsutum L.; G.barbadense L.; advanced backcross lines; fiber fineness; correlation
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