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Thymol ameliorates ammonium toxicity via repressing polyamine oxidase-derived hydrogen peroxide and modulating ammonium transporters in rice root

文献类型： 外文期刊

作者： Guo, Kai 1 ; An, Guangchi 3 ; Wang, Ning 4 ; Pang, Bingdong 5 ; Shi, Zhiqi 5 ; Bai, Hongwu 5 ; Zhang, Li 7 ; Chen, Jian 5 ; Xu, Weimin 8 ;

作者机构： 1.Henan Agr Univ, Natl Tobacco Cultivat & Physiol & Biochem Res Ctr, Key Lab Tobacco Cultivat Tobacco Ind, Zhengzhou 450002, Peoples R China

2.Qilu Univ Technol, Inst Biol, Shandong Prov Key Lab Biosensors, Shandong Acad Sci, Jinan 250014, Peoples R China

3.Zaozhuang Technol Promot Ctr Agr & Agr Machinery, Zaozhuang 277800, Peoples R China

4.Jiangsu Acad Agr Sci, Cent Lab, Nanjing 210014, Peoples R China

5.Inst Food Safety & Nutr, Jiangsu Acad Agr Sci, Lab Food Qual, Nanjing 210014, Peoples R China

6.Minist Sci & Technol, Safety State Key Lab Cultivat Base, Nanjing 210014, Peoples R China

7.Shandong Agr Univ, Coll Plant Protect, Tai An 271018, Shandong, Peoples R China

8.Minist Agr, Supervis & Testing Ctr Proc Agriprod Nanjing, Nanjing 210014, Peoples R China

关键词： Ammonium toxicity; Polyamine oxidase; Reactive oxygen species; Rice; Thymol

期刊名称：FOOD PRODUCTION PROCESSING AND NUTRITION （ 影响因子：4.7； 五年影响因子：5.0 ）

ISSN：

年卷期： 2021 年 3 卷 1 期

页码：

收录情况： SCI

摘要： Background: Ammonium is an indispensable nutrient for crop growth, but anoxic conditions or inappropriate fertilizer usage result in the increase in ammonium content in soil. Excessive ammonium causes phytotoxicity. Thymol is a kind of natural phenolic compound with anti-microbial properties. However, little is known about the role of thymol in modulating plant physiology. Here we find the novel role of thymol in protecting rice from ammonium toxicity. Results: Thymol remarkably rescued rice seedlings growth from ammonium stress, which may resulted from the attenuation of reactive oxygen species (ROS) accumulation, oxidative injury, and cell death in both shoots and roots. Polyamine oxidase (PAO) metabolizes polyamines to produce ROS in plants in response to stress conditions. Thymol blocked ammonium-induced upregulation of a set of rice PAOs, which contributed to the decrease in ROS content. In rice seedlings upon ammonium stress, thymol downregulate the expression of ammonium transporters (AMT1;1 and AMT1;2); thymol upregulated the expression of calcineurin B-like interacting protein kinase 23 (CIPK23) and calcineurin B-like binding protein 1 (CBL1), two negative regulators of AMTs. This may help rice avoid ammonium overload in excessive ammonium environment. Correlation analysis indicated that PAOs, AMTs, and CBL1 were the targets of thymol in the detoxification of excessive ammonium. Conclusion: Thymol facilitates rice tolerance against ammonium toxicity by decreasing PAO-derived ROS and modulating ammonium transporters. Such findings may be applicable in the modulation of nutrient acquisition during crop production.

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