Abstract: A rice mutant, showing the phenotype of high-tillering and dwarfing, was discovered from a population derived from a transgenic japonica cultivar ‘Zhonghua11’. The genetic analysis indicated that the phenotype of the mutant was controlled by a single recessive gene, which was designated tentatively as htd2. The F2 population was developed from a cross between the mutant and an indica cultivar ‘Longtefu B’ and used to investigate the genetic model and map the gene. The htd2 gene was firstly mapped on the short arm of chromosome3 and further mapped on the genetic region between SSR marker RM6038 and RM5444, which was 400 kb in length．

Key words: rice (Oryza sativa L.), high-tillering and dwarf mutant, genetic analysis, map-based cloning