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SPX4 interacts with both PHR1 and PAP1 to regulate critical steps in phosphorus-status-dependent anthocyanin biosynthesis

文献类型： 外文期刊

作者： He, Yuqing 1 ; Zhang, Xueying 1 ; Li, Linying 1 ; Sun, Zongtao 1 ; Li, Junmin 1 ; Chen, Xiaoya 3 ; Hong, Gaojie 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, State Key Lab Managing Biot & Chem Threats Qual &, Key Lab Biotechnol Plant Protect, Inst Virol & Biotechnol,Minist Agr & Zhejiang Pro, 198 Shiqiao Rd, Hangzhou 310021, Peoples R China

2.Ningbo Univ, State Key Lab Managing Biot & Chem Threats Qual &, Key Lab Biotechnol Plant Protect, Inst Plant Virol,Minist Agr & Zhejiang Prov, Ningbo 315211, Peoples R China

3.Shanghai Inst Plant Physiol & Ecol, CAS Ctr Excellence Mol Plant Sci, Natl Key Lab Plant Mol Genet, Shanghai 200032, Peoples R China

4.Shanghai Inst Plant Physiol & Ecol, CAS Ctr Excellence Mol Plant Sci, Natl Plant Gene Res Ctr, Shanghai 200032, Peoples R China

关键词： anthocyanin biosynthesis; flavonoids; phosphate signaling; PAP1; SPX4; Arabidopsis thaliana

期刊名称：NEW PHYTOLOGIST （ 影响因子：10.151； 五年影响因子：10.475 ）

ISSN： 0028-646X

年卷期： 2021 年 230 卷 1 期

页码：

收录情况： SCI

摘要： Phosphate (Pi) is the plant-accessible form of phosphorus, and its insufficiency limits plant growth. The over-accumulation of anthocyanins in plants is often an indication of Pi starvation. However, whether the two pathways are directly linked and which components are involved in this process await identification. Here, we demonstrate that SPX4, a conserved regulator of the Pi response, transduces the Pi starvation signal to anthocyanin biosynthesis in Arabidopsis. When phr1spx4 plants were grown under low Pi conditions, DFR expression and anthocyanin biosynthesis were induced, which distinguished the plant from the behavior reported in the phr1 mutant. We also provide evidence that SPX4 interacts with PAP1, an MYB transcription factor that controls the anthocyanin biosynthetic pathway, in an inositol polyphosphate-dependent manner. Through a physical interaction, SPX4 prevented PAP1 from binding to its target gene promoter; by contrast, during Pi-deficient conditions, in the absence of inositol polyphosphates, PAP1 was released from SPX to activate anthocyanin biosynthesis. Our results reveal a direct link between Pi deficiency and flavonoid metabolism. This new regulatory module, at least partially independent from PHR1, may contribute to developing a strategy for plants to adapt to Pi starvation.

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