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Sucrose promotes D53 accumulation and tillering in rice

文献类型： 外文期刊

作者： Patil, Suyash B. 1 ; Barbier, Francois F. 2 ; Zhao, Jinfeng 1 ; Zafar, Syed A. 1 ; Uzair, Muhammad 1 ; Sun, Yinglu; 1 ;

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

2.Univ Queensland, Sch Biol Sci, St Lucia, Qld 4072, Australia

3.Univ Queensland, ARC Ctr Plant Success Nat & Agr, St Lucia, Qld 4072, Australia

4.Univ Angers, SFR QUASAV 4207, IRHS, INRAE,Inst Agro, F-49000 Angers, France

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

关键词： pea; plant architecture; rice; shoot branching; strigolactones; sugar-hormone interactions

期刊名称：NEW PHYTOLOGIST （ 影响因子：10.152； 五年影响因子：10.476 ）

ISSN： 0028-646X

年卷期：

页码：

收录情况： SCI

摘要： Shoot branching is regulated by multiple signals. Previous studies have indicated that sucrose may promote shoot branching through suppressing the inhibitory effect of the hormone strigolactone (SL). However, the molecular mechanisms underlying this effect are unknown. Here, we used molecular and genetic tools to identify the molecular targets underlying the antagonistic interaction between sucrose and SL. We showed that sucrose antagonizes the suppressive action of SL on tillering in rice and on the degradation of D53, a major target of SL signalling. Sucrose inhibits the gene expression of D3, the orthologue of the Arabidopsis F-box MAX2 required for SL signalling. Overexpression of D3 antagonizes sucrose inhibition of D53 degradation and enables the SL inhibition of tillering under high sucrose. Sucrose prevents SL-induced degradation of D14, the SL receptor involved in D53 degradation. In contrast to D3, D14 overexpression enhances D53 protein levels and sucrose-induced tillering, even in the presence of SL. Our results show that sucrose inhibits SL response by affecting key components of SL signalling and, together with previous studies reporting the inhibition of SL synthesis by nitrate and phosphate, demonstrate the central role played by SLs in the regulation of plant architecture by nutrients.

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