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DWARF3 Participates in an SCF Complex and Associates with DWARF14 to Suppress Rice Shoot Branching

文献类型： 外文期刊

作者： Zhao, Jinfeng 1 ; Wang, Tao 1 ; Wang, Minxia 1 ; Liu, Yuanyuan 1 ; Yuan, Shoujiang 2 ; Gao, Yanan 3 ; Yin, Liang 2 ; Sun, 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Beijing 100081, Peoples R China

2.Shandong Rice Res Inst, Jinan 250100, Peoples R China

3.Liaocheng Un

关键词： GR24;High-tillering dwarf;SCF complex;Shoot branching;Strigolactones.

期刊名称：PLANT AND CELL PHYSIOLOGY （ 影响因子：4.927； 五年影响因子：5.516 ）

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收录情况： SCI

摘要： Strigolactones (SLs) are a novel class of plant hormones that inhibit shoot branching. Currently, two proteins in rice are thought to play crucial roles in SL signal transduction. DWARF14 (D14), an alpha/beta hydrolase, is responsible for SL perception, while DWARF3 (D3), an F-box protein with leucine-rich repeats, is essential for SL signal transduction. However, how these two proteins transmit SL signals to downstream factors remains unclear. Here, we characterized a high-tillering dwarf rice mutant, gsor300097, which is insensitive to GR24, a synthetic analog of SL. Mapping and sequencing analysis showed that gsor300097 is a novel allelic mutant of D3, in which a nonsense mutation truncates the protein from 720 to 527 amino acids. The D3 gene was strongly expressed in root, leaf, shoot base and panicle. Nuclear-localized F-box protein D3 played a role in the SCF complex by interacting with OSK1, OSK5 or OSK20 and OsCullin1. In addition, D3 associated with D14 in a GR24-dependent manner in vivo. Taken together, our findings suggested that D3 assembled into an SCFD3 complex and associated with D14 to suppress rice shoot branching.

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