Abstract
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 tillerspreading phenotype is controlled by one recessive gene that is allelic to a reported mutantla. Therefore, the mutant was namedla-2 andla renamedla-1. To map and cloneLA, we constructed a large mapping population. Genetic linkage analysis showed that theLA gene is located between 2 SSR markers RM202 and RM229. By using the 6 newly-developed molecular markers, theLA gene was placed within a 0.4 cM interval on chromosome 11, allowing us to cloneLA and study the mechanism that controls rice tiller angle at the molecular level.
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