摘要
用核辐射直接诱变杂交稻B系和R系 ,获得长穗颈高秆隐性eui突变体 ,继而育成长穗颈不育系 (eA)和高秆隐性恢复系 (eR) ,并组配出带有eui基因的高秆隐性杂交稻 (e 杂交稻 )。研究结果表明 ,eui基因具有较高的突变率 ,平均为 0 .10 % ,变幅为 0 .0 2 %～ 0 .4 7% ;依不同B系遗传背景和不同剂量而异。eui基因存在遗传多型性 ,发现了eui2 (t)新基因。eA系穗颈节显著伸长、异交潜力明显提高。e 杂交稻株高增高 3～ 10cm ,早熟 2～ 3d ,粒重增大 ,有增产的潜力。就不用 (少用 )赤霉素的种子生产技术体系以及e 杂交稻育种技术体系的建立进行了讨论。
Induced mutants with elongated uppermost internode (eui) were directly obtained after irradiation on maintainer (B) and restorer (R) lines of hybrid rice. CMS lines(A) with eui (referred to as eA), restorer lines with eui (referred to as eR) as well as hybrid rice with eui gene (referred to as e hybrids)were developed. The results showed that the eui mutation frequency averaged 0.10% at range of 0.02%～0.47%, varying with applied dosage and mutated materials. There are genetic diversities of eui stock, and a new eui gene, temporarily designated as eui2(t), was identified. eA lines have significant elongated uppermost internode causing panicle exsertion better and possessing higher outcrossing potential. e hybrids increased plant height by 3～10 cm and headed 2～3 days earlier, as well as shown greater grain weight resulting in higher yield potential than that of corresponding original hybrids. The technology systems without or a few of using GA 3 in hybrid rice seed production and the establishment of e hybrid rice breeding system were also discussed in this paper.
出处
《中国农业科学》
CAS
CSCD
北大核心
2002年第3期233-237,共5页
Scientia Agricultura Sinica
基金
国家自然科学基金资助项目 (3 0 0 70 470 )
