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PP2C.D phosphatase SAL1 positively regulates aluminum resistance via restriction of aluminum uptake in rice

文献类型： 外文期刊

作者： Xie, Wenxiang 1 ; Liu, Shuo 1 ; Gao, Huiling 1 ; Wu, Jun 3 ; Liu, Dilin 4 ; Kinoshita, Toshinori 5 ; Huang, Chao-Feng 1 ;

作者机构： 1.Chinese Acad Sci, Shanghai Inst Plant Physiol & Ecol, Shanghai Ctr Plant Stress Biol, CAS Ctr Excellence Mol Plant Sci,Natl Key Lab Plan, Shanghai 200032, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Hunan Hybrid Rice Res Ctr, State Key Lab Hybrid Rice, Changsha 410125, Peoples R China

4.Guangdong Acad Agr Sci, Rice Res Inst, Guangdong Prov Key Lab New Technol Rice Breeding, Guangzhou 510640, Peoples R China

5.Nagoya Univ, Grad Sch Sci, Div Biol Sci, Nagoya, Aichi 4648602, Japan

期刊名称：PLANT PHYSIOLOGY （ 影响因子：7.4； 五年影响因子：8.7 ）

ISSN： 0032-0889

年卷期： 2023 年 192 卷 2 期

页码：

收录情况： SCI

摘要： The plasma membrane (PM)-localized PP2C.D phosphatase SAL1 inhibits PM H+-ATPase to regulate NRAT1 transporter-mediated Al uptake and Al resistance in rice. Aluminum (Al) toxicity represents a primary constraint for crop production in acidic soils. Rice (Oryza sativa) is a highly Al-resistant species; however, the molecular mechanisms underlying its high Al resistance are still not fully understood. Here, we identified SAL1 (SENSITIVE TO ALUMINUM 1), which encodes a plasma membrane (PM)-localized PP2C.D phosphatase, as a crucial regulator of Al resistance using a forward genetic screen. SAL1 was found to interact with and inhibit the activity of PM H+-ATPases, and mutation of SAL1 increased PM H+-ATPase activity and Al uptake, causing hypersensitivity to internal Al toxicity. Furthermore, knockout of NRAT1 (NRAMP ALUMINUM TRANSPORTER 1) encoding an Al uptake transporter in a sal1 background rescued the Al-sensitive phenotype of sal1, revealing that coordination of Al accumulation in the cell, wall and symplasm is critical for Al resistance in rice. By contrast, we found that mutations of PP2C.D phosphatase-encoding genes in Arabidopsis (Arabidopsis thaliana) enhanced Al resistance, which was attributed to increased malate secretion. Our results reveal the importance of PP2C.D phosphatases in Al resistance and the different strategies used by rice and Arabidopsis to defend against Al toxicity.

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