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HBI transcription factor-mediated ROS homeostasis regulates nitrate signal transduction

文献类型： 外文期刊

作者： Chu, Xiaoqian 1 ; Wang, Jia-Gang 1 ; Li, Mingzhe 1 ; Zhang, Shujuan 3 ; Gao, Yangyang 4 ; Fan, Min 1 ; Han, Chao 1 ; Xian 1 ;

作者机构： 1.Shandong Univ, Sch Life Sci, Key Lab Plant Dev & Environm Adaptat Biol, Minist Educ, Qingdao 266237, Peoples R China

2.Shanxi Agr Univ, Coll Agr, Taigu 030801, Peoples R China

3.Shandong Acad Agr Sci, Crop Res Inst, Jinan 250100, Peoples R China

4.Shandong Agr Univ, Coll Life Sci, State Key Lab Crop Biol, Tai An 271018, Shandong, Peoples R China

5.Shanghai Jiao Tong Univ, Sch Life Sci & Biotechnol, Shanghai 200240, Peoples R China

6.Univ Sci & Technol China, Hefei Natl Sci Ctr Phys Sci Microscale, Sch Life Sci, Hefei 230027, Peoples R China

7.Univ Sci & Technol China, Hefei Natl Sci Ctr Phys Sci Microscale, Div Mol & Cell Biophys, Hefei 230027, Peoples R China

期刊名称：PLANT CELL （ 影响因子：11.277； 五年影响因子：12.061 ）

ISSN： 1040-4651

年卷期： 2021 年 33 卷 9 期

页码：

收录情况： SCI

摘要： Nitrate is both an important nutrient and a critical signaling molecule that regulates plant metabolism, growth, and development. Although several components of the nitrate signaling pathway have been identified, the molecular mechanism of nitrate signaling remains unclear. Here, we showed that the growth-related transcription factors HOMOLOG OF BRASSINOSTEROID ENHANCED EXPRESSION2 INTERACTING WITH IBH1 (HBI1) and its three closest homologs (HBIs) positively regulate nitrate signaling in Arabidopsis thaliana. HBI1 is rapidly induced by nitrate through NLP6 and NLP7, which are master regulators of nitrate signaling. Mutations in HBIs result in the reduced effects of nitrate on plant growth and similar to 22% nitrate-responsive genes no longer to be regulated by nitrate. HBIs increase the expression levels of a set of antioxidant genes to reduce the accumulation of reactive oxygen species (ROS) in plants. Nitrate treatment induces the nuclear localization of NLP7, whereas such promoting effects of nitrate are significantly impaired in the hbi-q and cat2 cat3 mutants, which accumulate high levels of H2O2. These results demonstrate that HBI-mediated ROS homeostasis regulates nitrate signal transduction through modulating the nucleocytoplasmic shuttling of NLP7. Overall, our findings reveal that nitrate treatment reduces the accumulation of H2O2, and H2O2 inhibits nitrate signaling, thereby forming a feedback regulatory loop to regulate plant growth and development.

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