Abstract: A dwarf mutant CHA-1 obtained from a high-plant rice cultivar Tehuazhan by space inducement, and its response to gibberellic acid (GA₃) at seedling stage was studied. CHA-1 was sensitive to GA₃, but it was different to Nipponbare(japonica) and Aijiaonante(indica) (both with semidwarf gene sd-1) in sensitivity to GA₃. Further genetic analysis revealed that the mutant was controlled by a dwarf gene which was non-allelic with dwarf gene sd-1.

Key words: rice, space mutation, dwarf mutant, gibberellic acid, genetic analysis

摘要： 应用不同浓度的赤霉素（GA[sub]3[/sub]）溶液在苗期处理CHA-1特华占原种、日本晴、矮脚南特等4个材料，研究它们对GA[sub]3[/sub]反应的敏感性。结果表明，经空间诱变的矮秆突变体在苗期对GA[sub]3[/sub]的反应敏感，但与已知带[i]sd-1[/i]基因的籼、粳稻代表品种矮脚南特、日本晴敏感性有差异。进一步的遗传分析表明，控制CHA-1的一对隐性矮秆基因与[i]sd-1[/i]基因不等位。

关键词: 水稻, 空间诱变, 矮秆突变体, 赤霉素, 遗传学分析