A Novel Role of Pipecolic Acid Biosynthetic Pathway in Drought Tolerance through the Antioxidant System in Tomato

被引:23
|
作者
Wang, Ping [1 ]
Luo, Qian [1 ]
Yang, Weicheng [1 ]
Ahammed, Golam Jalal [1 ]
Ding, Shuting [1 ]
Chen, Xingyu [1 ]
Wang, Jiao [1 ]
Xia, Xiaojian [1 ,2 ]
Shi, Kai [1 ,2 ]
机构
[1] Zhejiang Univ, Dept Hort, Hangzhou 310058, Peoples R China
[2] Zhejiang Prov Key Lab Hort Plant Integrat Biol, Hangzhou 310058, Peoples R China
基金
中国国家自然科学基金;
关键词
pipecolic acid; CRISPR-Cas9; drought resistance; photosystems; antioxidants; SALICYLIC-ACID; OXIDATIVE STRESS; PLANT-RESPONSES; ABSCISIC-ACID; ARABIDOPSIS; METABOLISM; THERMOTOLERANCE; PHOTOSYNTHESIS; CHLOROPLASTS; DISSECTION;
D O I
10.3390/antiox10121923
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
With global warming and water shortage, drought stress is provoking an increasing impact on plant growth, development, and crop productivity worldwide. Pipecolic acid (Pip) is an emerging lysine catabolite in plants, acting as a critical element in disease resistance with a related signal pathway of phytohormone salicylic acid (SA). While SA plays a vital role in various abiotic stresses, the role of Pip in plant response to abiotic stresses, especially drought, remains largely unknown. To address this issue, Pip biosynthetic gene Slald1 mutants and hydroxylated modification gene Slfmo1 mutants were generated using CRISPR-Cas9 gene-editing approaches. Drought resistance dramatically increased in Slald1 mutants compared with wild-type, which was associated with increased CO2 assimilation, photosystems activities, antioxidant enzymes activities, ascorbate and glutathione content, and reduced reactive oxygen species accumulation, lipid peroxidation and protein oxidation. On the contrary, Slfmo1 mutants were more sensitive to drought, showing damaged photosystems and impaired antioxidant systems, which were significantly alleviated by exogenous ascorbate. Our results demonstrate that Pip biosynthesis and hydroxylated modification pathways play a critical role in drought tolerance through the antioxidant system in tomato. This knowledge can be helpful to breed improved crop cultivars that are better equipped with drought resistance.
引用
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页数:15
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