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AIM1-dependent high basal salicylic acid accumulation modulates stomatal aperture in rice

文献类型： 外文期刊

作者： Xu, Lei 1 ; Zhao, Hongyu 1 ; Wang, Junbin 2 ; Wang, Xuming 4 ; Jia, Xianqing 1 ; Wang, Long 1 ; Xu, Zhuang 1 ; Li, Ruili 1 ; Jiang, Kun 5 ; Chen, Zhixiang 7 ; Luo, Jie 8 ; Xie, Xiaodong 2 ; Yi, Keke 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arid & Semiarid A, Beijing 100081, Peoples R China

2.Tianjin Agr Univ, Coll Agr & Resources & Environm Sci, Int Joint Ctr Mech Dissect & Genet Improvement Cro, Tianjin 300392, Peoples R China

3.Tianjin Agr Univ, Coll Basic Sci, Tianjin 300392, Peoples R China

4.Zhejiang Acad Agr Sci, State Key Lab Managing Biot & Chem Threats Qual &, Key Lab Plant Protect & Biotechnol, Zhejiang Prov Key Lab Plant Virol,Minist Agr, Hangzhou 310021, Peoples R China

5.Zhejiang Univ, Coll Life Sci, Hangzhou 310058, Zhejiang, Peoples R China

6.China Jiliang Univ, Coll Life Sci, 258 Xueyuan St, Hangzhou 310018, Zhejiang, Peoples R China

7.Purdue Univ, Purdue Ctr Plant Biol, Dept Bot & Plant Pathol, 915 W State St, W Lafayette, IN 47907 USA

8.Hainan Univ, Sanya Nanfan Res Inst, Hainan Yazhou Bay Seed Lab, Sanya 572025, Peoples R China

关键词： OsAIM1; rice; salicylic acid biosynthesis; shoot temperature; stomata

期刊名称：NEW PHYTOLOGIST （ 影响因子：9.4； 五年影响因子：10.5 ）

ISSN： 0028-646X

年卷期： 2023 年 238 卷 4 期

页码：

收录情况： SCI

摘要： The basal levels of salicylic acid (SA) vary dramatically among plant species. In the shoot, for example, rice contains almost 100 times higher SA levels than Arabidopsis. Despite its high basal levels, neither the biosynthetic pathway nor the biological functions of SA are well understood in rice.Combining with metabolite analysis, physiological, and genetic approaches, we found that the synthesis of basal SA in rice shoot is dependent on OsAIM1, which encodes a beta-oxidation enzyme in the phenylalanine ammonia-lyase (PAL) pathway.Compromised SA accumulation in the Osaim1 mutant led to a lower shoot temperature than wild-type plants. However, this shoot temperature defect resulted from increased transpiration due to elevated steady-state stomatal aperture in the mutant. Furthermore, the high basal SA level is required for sustained expression of OsWRKY45 to modulate the steady-state stomatal aperture and shoot temperature in rice.Taken together, these results provide the direct genetic evidence for the critical role of the PAL pathway in the biosynthesis of high basal level SA in rice, which plays an important role in the regulation of steady-state stomatal aperture to promote fitness under stress conditions.

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