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Functional Plant Biology Functional Plant Biology Society
Plant function and evolutionary biology
REVIEW

Melatonin modulates the tolerance of plants to water stress: morphological response of the molecular mechanism

Minmin He https://orcid.org/0009-0006-6023-9285 A B C , Gui Geng https://orcid.org/0000-0002-2520-7185 A B C * , Shuyang Mei A B C , Gang Wang A B C , Lihua Yu A B C , Yao Xu A B C and Yuguang Wang https://orcid.org/0000-0003-2260-5652 A B C *
+ Author Affiliations
- Author Affiliations

A National Sugar Crop Improvement Centre, College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin 150080, China.

B Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education & Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region & College of Life Sciences, Heilongjiang University, Harbin, Heilongjiang 150500, China.

C Heilongjiang Sugar Beet Engineering Technology Research Center, College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin 150080, China.


Handling Editor: Sergey Shabala

Functional Plant Biology 51, FP23199 https://doi.org/10.1071/FP23199
Submitted: 11 September 2023  Accepted: 24 January 2024  Published: 15 February 2024

© 2024 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Water stress (drought and waterlogging) leads to an imbalance in plant water distribution, disrupts cell homeostasis, and severely inhibits plant growth. Melatonin is a growth hormone that plants synthesise and has been shown to resist adversity in many plants. This review discusses the biosynthesis and metabolism of melatonin, as well as the changes in plant morphology and physiological mechanisms caused by the molecular defence process. Melatonin induces the expression of related genes in the process of plant photosynthesis under stress and protects the structural integrity of chloroplasts. Exogenous melatonin can maintain the dynamic balance of root ion exchange under waterlogging stress. Melatonin can repair mitochondria and alleviate damage caused by reactive oxygen species and reactive nitrogen species; and has a wide range of uses in the regulation of stress-specific genes and the activation of antioxidant enzyme genes. Melatonin improves the stability of membrane lipids in plant cells and maintains osmotic balance by regulating water channels. There is crosstalk between melatonin and other hormones, which jointly improve the ability of the root system to absorb water and breathe and promote plant growth. Briefly, as a multifunctional molecule, melatonin improves the tolerance of plants under water stress and promotes plant growth and development.

Keywords: antioxidant system, biosynthesis, drought, melatonin, photosynthesis, plant hormone, water stress, waterlogging.

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