Compound grain rice gene CS and application thereof

The invention provides a compound rice gene CS and application thereof. According to the invention, the complex grain rice gene CS is cloned for the first time, the gene encodes a BR degrading enzyme CYP734A4, a CS promoter in the complex grain rice contains insertion of 34 AT copies relative to a reference genome, the promoter activity can be enhanced, the CS gene in the complex grain rice specifically has up-regulated expression in pedicels and secondary branch meristem, and the specific expression of the CS gene in the complex grain rice is up-regulated in the pedicels and secondary branch meristem. Compared with non-compound-grain rice, the compound-grain rice has the advantages that the yield can be obviously increased by about 10% under the same background without changing the grain size and the plant height of the rice, and a powerful means is provided for high-yield breeding of the rice. 本发明提供复粒稻基因CS及其应用。本发明首次克隆了复粒稻基因CS，该基因编码一个BR降解酶CYP734A4，复粒稻中CS启动子相对于参考基因组包含一个34个AT拷贝的插入，可以增强启动子活性，而且复粒稻中CS基因特异在花梗和二级分