Mapping and characterization of a tiller-spreading mutant lazy-2 in rice

• 作 者: LI Peijin ZENG Dali Liu Xinfan
• 机 构: National Center for Plant Genome Research, School of Life Sciences,State Key Laboratory of Rice Biol
• 出 处: 科学通报
• 发表日期: 2004年期
• 关键词: Oryza sativa L. tiller angle tiller-spreading mutant la-2 fine mapping
• 基金项目: 国家自然科学基金;国家高技术研究发展计划(863计划)

Tiller angle of rice is an important agronomic trait that contributes to breed new varieties with ideal architecture. In this study, we report mapping and characterization of a rice mutant defective in tiller angle. At the seedling stage, the newly developed tillers of the mutant plants grow with a large angle that leads to a "lazy" phenotype at the mature stage. Genetic analysis indicates that this tiller-spreading phenotype is controlled by one recessive gene that is allelic to a reported mutant la. Therefore, the mutant was named la-2 and la renamed la-1. To map and clone LA, we constructed a large mapping population. Genetic linkage analysis showed that the LA gene is located between 2 SSR markers RM202 and RM229. By using the 6 newly-developed molecular markers, the LA gene was placed within a 0.4 cM interval on chromosome 11, allowing us to clone LA and study the mechanism that controls rice tiller angle at the molecular level.