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The application of exogenous PopW increases the tolerance of Solanum lycopersicum L. to drought stress through multiple mechanisms

文献类型： 外文期刊

作者： Zhou, Xiaosi 1 ; Chen, Yu 1 ; Zhao, Yangyang 3 ; Gao, Fangyuan 1 ; Liu, Hongxia 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Plant Protect, Dept Plant Pathol, Nanjing 210095, Peoples R China

2.Nanjing Agr Univ, Minist Educ, Key Lab Integrated Management Crop Dis & Pests, Nanjing, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Plant Protect, Nanjing 210014, Peoples R China

关键词： Drought tolerance; PopW; Solanum lycopersicum L; Osmotic adjustment; Redox homeostasis; Stomatal closure

期刊名称：PHYSIOLOGY AND MOLECULAR BIOLOGY OF PLANTS （ 影响因子：2.391； 五年影响因子：2.836 ）

ISSN： 0971-5894

年卷期： 2020 年 26 卷 12 期

页码：

收录情况： SCI

摘要： Tomato is a major cultivated vegetable species of great economic importance throughout the world, but its fruit yield is severely impaired by drought stress. PopW, a harpin protein from Ralstonia solanacearum ZJ3721, plays vital roles in various plant defence responses and growth. In this study, we observed that the foliar application of PopW increased tomato drought tolerance. Our results showed that compared with water-treated plants, PopW-treated plants presented a significantly higher recovery rate and leaf relative water content under drought-stress conditions. PopW decreased the malondialdehyde content and relative electrical conductivity by 40.2% and 21%, respectively. Drought disrupts redox homeostasis through the excessive accumulation of reactive oxygen species (ROS). PopW-treated plants displayed an obvious reduction in ROS accumulation due to enhanced activities of the antioxidant enzyme catalase, superoxide dismutase and peroxidase. Moreover, PopW promoted early stomatal closure, thereby minimizing the water loss rate of plants under drought stress. Further investigation revealed that endogenous abscisic acid (ABA) levels and the transcript levels of drought-responsive genes involved in ABA signal transduction pathways increased in response to PopW. These results confirm that PopW increases drought tolerance through multiple mechanisms involving an enhanced water-retention capacity, balanced redox homeostasis, increased osmotic adjustment, reduced membrane damage and decreased stomatal aperture, suggesting that the application of exogenous PopW may be a potential method to enhance tomato drought tolerance.

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