关键词: 水稻(Oryza sativa L.), 矮杆突变体, 小粒突变体, 遗传分析, 基因定位

Abstract: A small grain and dwarf rice mutant, designated as t129, was discovered in the rice T-DNA insertion mutation library. As compared to that in wild-type plants, t129 exhibited characters of dwarf, small grain, and lower 1 000-grain weight (GW). Genetic analysis showed the mutant character was controlled by a recessive gene. Through map-based cloning, the gene T129 was located on the long arm of rice chromosome 5 between primer InDel43 and InDel57 with 430 kb physical distance, and it was co-segregated with InDel51 marker. This study defined the phenotypic characteristics and inheritance of a small grain and dwarf mutant, which laid foundation for further study on genes regulating plant height and grain-type.

Key words: rice (Oryza sativa L.), dwarf mutant, small grain mutant, genetic analysis, gene mapping