论文部分内容阅读
世界上大面积利用棉花杂种优势的国家,有印度和我国,但采用雄性核不育的方法生产杂交种,仅我国四川省。全省杂交棉的面积达50万亩,比一般常规品种增产15～20%,品质优良,比印度使用的去雄授粉,简便省工,深受棉区群众欢迎。笔者有幸去简阳、仁寿两县参加座谈,并参观了杂交棉,认为这是棉花种子工作上的一个特色。 1972年,在当时四川推广品种洞庭1号中,发现一株原始不育株,经选育成“洞A”雄性核不育两用系。此后,用单交系统选育法,与其它品种杂交,育成配合力强的75lA(四川南充地区所)、473A(四川省棉花所)等两用不育系。不育株如经自交,全株无一成铃,不育性很稳定。遗传研究表明,不育性状是受一对隐性核基因控制,基因符
Countries in the world that utilize cotton heterosis on a large scale are India and China, but they produce hybrids using male sterile methods only in China’s Sichuan Province. The area of hybrid cotton in the province reached 500,000 mu, an increase of 15 ~ 20% over that of conventional varieties. The quality is better than that of India. I was fortunate enough to go to Jianyang, Renshou two counties to participate in the discussion, and visited the hybrid cotton, think this is a feature of cotton seed work. In 1972, at the time of the promotion Dongting No. 1 in Sichuan Province, one original sterile line was found, which was bred into “Dong A” male sterile line. Since then, with single cross breeding system, and other varieties of hybridization, bred with strong 75lA (Sichuan Nanchong area), 473A (cotton Sichuan Province) and other dual-use sterile lines. Infertility strains such as selfing, whole plant without a bell, infertility is very stable. Genetic studies have shown that sterility traits are controlled by a pair of recessive nuclear genes