期刊
PLANT SOIL AND ENVIRONMENT
卷 67, 期 4, 页码 208-220出版社
CZECH ACADEMY AGRICULTURAL SCIENCES
DOI: 10.17221/659/2020-PSE
关键词
salinity tolerance mechanisms; osmolyte; malondialdehyde; phytohormone; secondary metabolites; ascorbate
类别
Foliar spraying of melatonin can alleviate salt stress damage in soybean plants by improving pigment synthesis and PSII activity, regulating antioxidant systems, reducing ROS accumulation, and protecting membrane functioning.
Soybean plants grown under NaCl were foliar sprayed twice with melatonin (MLT). Results revealed that salt stress reduced growth, biomass accumulation, photosynthesis, mineral uptake, the content of 8-aminolevulinic acid, chlorophylls, carotenoids and PSII efficiency. However, MLT application enhanced pigment synthesis and PSII activity. MLT up-regulated the antioxidant system and glyoxalase function resulting in reduced accumulation of reactive oxygen species (ROS). Reduced ROS in MLT-treated plants protected membrane functioning by reducing lipid peroxidation, electrolyte leakage and lipoxygenase activity. Nevertheless, MLT application reduced methylglyoxal accumulation while increased the content of reduced glutathione and ascorbic acid. It could be concluded that exogenous MLT mitigated the salt stress damage in soybean plants by improving photosynthesis, antioxidant systems, controlling ion homeostasis and minimising excessive ROS accumulation.
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