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Exogenous Melatonin Confers Salt Stress Tolerance to Watermelon by Improving Photosynthesis and Redox Homeostasis

Open access
Li, Hao, Chang, Jingjing, Chen, Hejie, Wang, Zhongyuan, Gu, Xiurong, Wei, Chunhua, Zhang, Yong, Ma, Jianxiang, Yang, Jianqiang, Zhang, Xian·2017·Frontiers in Plant Science

Abstract

Melatonin, a pleiotropic signal molecule, has been shown to play important roles in the regulation of plant growth, development, and responses to environmental stresses. Since a few species have been investigated to unveil the effect of exogenous melatonin on salt stress, the underlying mechanism of melatonin-mediated salt stress tolerance in other plant species still remains largely unknown. In this study, the effects of melatonin on leaf photosynthesis and redox homeostasis in watermelon were examined under salt stress (300 mM NaCl) along with different doses of melatonin (50, 150, and 500 μM) pretreatment. NaCl stress inhibited photosynthesis and increased accumulation of reactive oxygen species and membrane damage in leaves of watermelon seedlings. However, pretreatment with melatonin on roots alleviated NaCl-induced decrease in photosynthetic rate and oxidative stress in a dose-dependent manner. The protection of photosynthesis by melatonin was closely associated with the inhibition of stomatal closure and improved light energy absorption and electron transport in photosystem II, while the reduction of oxidative stress by melatonin was attributed to the improved redox homeostasis coupled with the enhanced activities of antioxidant enzymes. This study unraveled crucial role of melatonin in salt stress mitigation and thus can be implicated in the management of salinity in watermelon cultivation.

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Metadata

Authors
Li, H., Chang, J., Chen, H., Wang, Z., Gu, X., Wei, C., Zhang, Y., Ma, J., Yang, J., & Zhang, X.
Venue
Frontiers in Plant Science
Published
2017-03-01
Volume
8
Pages
295-295
ISSN
1664-462X (ISSN-L)
OpenAlex
W2591106951
Cited by
375
References
41
FWCI
26.64
Type
journal article
Language
en
Open access
gold

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The paper
Li, H., Chang, J., Chen, H., Wang, Z., Gu, X., Wei, C., Zhang, Y., Ma, J., Yang, J., & Zhang, X. (2017). Exogenous Melatonin Confers Salt Stress Tolerance to Watermelon by Improving Photosynthesis and Redox Homeostasis. Frontiers in Plant Science. https://doi.org/10.3389/fpls.2017.00295

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