分生组织
水稻
分蘖(植物学)
生物
拟南芥
细胞生物学
增强子
突变体
腋芽
泛素
激活剂(遗传学)
同源盒
乙烯利
开枪
泛素连接酶
蛋白酶体
司他内酯
基因
植物
遗传学
生物化学
转录因子
外植体培养
催化作用
体外
乙烯
作者
Qian Lin,Dan Wang,Hui Dong,Suhai Gu,Zhijun Cheng,Jie Gong,Ruizhen Qin,Ling Jiang,Gang Li,Jiu Lin Wang,Fuqing Wu,Xiuping Guo,Xin Zhang,Cailin Lei,Haiyang Wang,Jianmin Wan
摘要
Rice MONOCULM 1 (MOC1) and its orthologues LS/LAS (lateral suppressor in tomato and Arabidopsis) are key promoting factors of shoot branching and tillering in higher plants. However, the molecular mechanisms regulating MOC1/LS/LAS have remained elusive. Here we show that the rice tiller enhancer (te) mutant displays a drastically increased tiller number. We demonstrate that TE encodes a rice homologue of Cdh1, and that TE acts as an activator of the anaphase promoting complex/cyclosome (APC/C) complex. We show that TE coexpresses with MOC1 in the axil of leaves, where the APC/C(TE) complex mediates the degradation of MOC1 by the ubiquitin-26S proteasome pathway, and consequently downregulates the expression of the meristem identity gene Oryza sativa homeobox 1, thus repressing axillary meristem initiation and formation. We conclude that besides having a conserved role in regulating cell cycle, APC/C(TE) has a unique function in regulating the plant-specific postembryonic shoot branching and tillering, which are major determinants of plant architecture and grain yield.
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