西亚试剂：DWARF 53 acts as a repressor of strigolactone signalling in

DWARF 53 acts as a repressor of strigolactone signalling in rice

Liang Jiang，  Xue Liu，  Guosheng Xiong，  Huihui Liu，  Fulu Chen，  Lei Wang，  Xiangbing Meng， Guifu Liu，  Hong Yu，  Yundong Yuan，  Wei Yi，  Lihua Zhao，  Honglei Ma，  Yuanzheng He， Zhongshan Wu，  Karsten Melcher，  Qian Qian，  H. Eric Xu，  Yonghong Wang  & Jiayang Li

Strigolactones (SLs) are a group of newly identified plant hormones that control plant shoot branching. SL signalling requires the hormone-dependent interaction of DWARF 14 (D14)， a probable candidate SL receptor， with DWARF 3 (D3)， an F-box component of the Skp–Cullin–F-box (SCF) E3 ubiquitin ligase complex. Here we report the characterization of a dominant SL-insensitive rice (Oryza sativa) mutant dwarf 53 (d53) and the cloning of D53， which encodes a substrate of the SCFD3 ubiquitination complex and functions as a repressor of SL signalling. Treatments with GR24， a synthetic SL analogue， cause D53 degradation via the proteasome in a manner that requires D14 and the SCFD3 ubiquitin ligase， whereas the dominant form of D53 is resistant to SL-mediated degradation. Moreover， D53 can interact with transcriptional co-repressors known as TOPLESS-RELATED PROTEINS. Our results suggest a model of SL signalling that involves SL-dependent degradation of the D53 repressor mediated by the D14–D3 complex.

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