Phenotypic Characterization and Genetic Mapping of an Increased Stigma Mutant in Rice (Oryza sativa L.)
Floral organ development directly affects rice yield and quality. Here we report a rice floral mutant with increased stigmas, which was isolated from the progenies of the combination of C2/2480. Compared with the wild type rice, the mutant showed dwarf plant, small panicle and grain, curled flag leaf, narrow and opening spikelet, and later flowering. Most of florets were made up of normal lodicule, increased stigmas, more pistils, and fewer stamens. Segregation of wild type plants to mutant plants in three F2population were accorded with the ratio of 3:1, which indicated that the mutant is controlled by a single recessive gene. With SSR (Simple Sequence Repeat) markers screening in a total of 92 F2 mutant individuals derived from the cross of ism/Tl 16, the mutant gene was located between the molecular markers RM3183 and RM3827, at the distances of 2.2 cM and 12.0 cM, respectively, on chromosome 6, and co-segregated with RM11951, RM19953, and RM19961. ISM(t) is a new floral-organ identity gene located on chromosome 6 in rice. This result provided a foundation of map-based cloning and function analysis of ISM(t) gene.
国家科技期刊平台
NSTL
万方数据
维普
