棉 花 学 报      Cotton Science    2007，19(1)：38-41

Study on Fiber Properties of Parents，F₁，F₂and F₃ Generations of Transgenic Hybrid Cotton
LI Rui-lian，LIU Ai-yu，CHEN Jin-xiang^*
(Cotton Research Institute of Hunan Agricultural University，Changsha，410128 China)

Abstract：Cotton varieties with the Bt gene have been widely accepted and planted around the world.They were introduced into China in 1996 in order to control the insects and weeds. Since then，the transgenic hybrids have been widely planted in China. The application of the hybrid insect-resistant cotton can，on one hand，keep its resistance to insect while greatly increasing its yielding；on the other hand，the problems of fiber quality is also gradually being stressed and considered.
It was expensive to make first-generation hybrids (F₁).Compared with F₁，the lint yield per area of F₂was lower，but still higher than that of the conventional varieties and their parents. Thus F₂ has been grow extensively in the southern China cotton region. However，Some farmer saved F₂ hybrids. Nevertheless，the decline of fiber qualities attracted more and more attention. The study was conducted to compare with fiber quality variances between parents，F₁，F₂and F₃in 2000-2004.15 varieties (parents and F₁，F₂ and F₃ ) were planted in the experiment station of Hunan Agricultural University in Changsha. The results showed that fiber strength，fiber fineness (micronaire) were of significant heterosis，while others were no. F₁ was higher than F₂ ，F₃. For mid-parent heterosis of fiber strength，mean value were 11.84%，Nong-Za 62 F₁ was 17.44%.For high parent heterosis of fiber strength，H₆₄ F₁ had no heterosis，Nong-Za 62 F₁ and H ₁₆ F₁ were 9.46%，14.34%，respectively. Compared with CK，except fiber fineness (micronaire)，others were not over standard heterosis. The sample means of F₁，F₂ and F₃ fiber properties，such as length， uniformity of fiber length，fiber elongation were not significantly different. But the values of these characteristics varied from individual to individual within the F₁，F₂ and F₃ population.Fiber of F₁ was stronger than that of F₂ and F₃，fiber fineness (micronaire) of F₁ was smaller than that of F₂ and F₃，average fiber length and average fiber elongation percentage of F₁ were better than that of F₂ and F₃，respectiuely. The biggest variation coefficient was fiber fineness (micronaire) of 6.72% ， which was about three times of fiber length. The second was fiber strength.The minimum variation coefficient was uniformity of fiber length. So the integrated fiber quality of F₁ was better than that of F₂. The integrated fiber quality of F₂ was a little better than that of F₃.
key words：transgenic hybrid cotton；fiber property；heterosis [Full Text，1741KB]