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Protein kinase MeSnRK2.3 positively regulates starch biosynthesis by interacting with the transcription factor MebHLH68 in cassava

文献类型： 外文期刊

作者： Li, Ke 1 ; Li, Yajun 2 ; Liu, Chen 4 ; Li, Mengtao 1 ; Bao, Ruxue 1 ; Wang, Haiyan 2 ; Zeng, Changying 1 ; Zhou, Xincheng 1 ; Chen, Yinhua 1 ; Wang, Wenquan 1 ; Chen, Xin 1 ;

作者机构： 1.Hainan Univ, Sanya Nanfan Res Inst, Natl Key Lab Trop Crop Breeding, Sanya 572025, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, Haikou 571101, Hainan, Peoples R China

3.Hainan Inst Trop Agr Resources, Key Lab Biol & Genet Resources Trop Crops Hainan P, Haikou 571101, Hainan, Peoples R China

4.Shenzhen Univ, Coll Life Sci & Oceanog, Shenzhen 518060, Peoples R China

5.Chinese Acad Trop Agr Sci, Sanya Res Inst, Sanya 572025, Hainan, Peoples R China

关键词： ABA; cassava; MebHLH68; MeSnRK2.3; starch; sucrose

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：5.7； 五年影响因子：6.8 ）

ISSN： 0022-0957

年卷期： 2024 年

页码：

收录情况： SCI

摘要： Starch biosynthesis involves numerous enzymes and is a crucial metabolic activity in plant storage organs. Sucrose non-fermenting related protein kinase 2 (SnRK2) is an abscisic acid (ABA)-dependent kinase and a significant regulatory enzyme in the ABA signaling pathway. However, whether SnRK2 kinases regulate starch biosynthesis is unclear. In this study, we identified that MeSnRK2.3, encoding an ABA-dependent kinase, was highly expressed in the storage roots of cassava (Manihot esculenta) and was induced by ABA. Overexpression of MeSnRK2.3 in cassava significantly increased the starch content in the storage roots and promoted plant growth. MeSnRK2.3 was further found to interact with the cassava basic helix-loop-helix 68 (MebHLH68) transcription factor in vivo and in vitro. MebHLH68 directly bound to the promoters of sucrose synthase 1 (MeSUS1), granule-bound starch synthase I a (MeGBSSIa), and starch-branching enzyme 2.4 (MeSBE2.4), thereby up-regulating their transcriptional activities. Additionally, MebHLH68 negatively regulated the transcriptional activity of sucrose phosphate synthase B (MeSPSB). Moreover, MebHLH68 phosphorylated by MeSnRK2.3 up-regulated the transcription activity of MeSBE2.4. These findings demonstrated that the MeSnRK2.3-MebHLH68 module connects the ABA signaling pathway and starch biosynthesis in cassava, thereby providing direct evidence of ABA-mediated participation in the sucrose metabolism and starch biosynthesis pathways. Protein kinase MeSnRK2.3 in the ABA signaling pathway positively regulates starch biosynthesis by interacting with and phosphorylating the transcription factor MebHLH68, thereby regulating expression of sucrose metabolism and starch biosynthesis genes in cassava.

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