Wnafstu棉花雄性不育系遗传类型研究

 以中棉所41、陕7359（系）、陕2089（系）、陕2234、陕024（系）5个陆地棉种质和8046-1、8046-2、8046-3三个与不育系具相同遗传背景的可育种质为测试父本，采用连续多代和多父本分别株对株测交，对西北农林科技大学发现的暂定名Wnafstu的雄性不育系进行研究。结果表明，5个陆地棉种质父本与不育系测交后，子代均为100%不育株；3个与不育株具相同遗传背景的可育株分别与不育株测交后，子代有不育和可育株两种类型，分离没有规律。据此认为，该不育系属细胞质雄性不育类型。一般陆地棉种质与其杂交，都可保持其不育性。与其具相同遗传背景的可育种质对不育系育性有恢复功能。提出了对该不育系下一步研究的方向。

Characterization of Inheritance on Fertility of a New Male-sterile Line Wnafstu of Cotton

The male sterile line, temporarily designated as Wnafstu developed by NWSUAF, was characterized through several successive backcrossing（plant to plant）using five accessions of G. hirsutum Cv. CCRI 41, Shaan 7359, Shaan 2089, Shaan 2234 and Shaan 204  as recurrent male parents, and crossed with three male-fertile lines (8046-1,8046-2 and 8046-3) with the same genetic background as Wnafstu. The progenies of Wnafstu backcrossed with five accessions were stable in male sterility with 100% plants; but the F₁ population of crosses with 8046 was partially fertile with irregular segregation ratio. It inferred that the male sterility was controlled by cytoplasmic genetic factor(s).