Exogenous melatonin enhances the reactive oxygen species metabolism, antioxidant defense‐related gene expression, and photosynthetic capacity of Phaseolus vulgaris L. to confer salt stress tolerance

Melatonin (MT) has been reported to regulate certain plant physiological processes and promote tolerance to different environmental stresses such as salinity. Green bean (Phaseolus vulgaris L. cv. Royal Nel) seedlings were exposed to 200 mM NaCl with or without pre‐treatment with 150 μM MT. Salt str...

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Bibliographic Details
Published in:Physiologia plantarum 2021-12, Vol.173 (4), p.1369-1381
Main Authors: ElSayed, Abdelaleim Ismail, Rafudeen, Mohammed Suhail, Gomaa, Ayman M., Hasanuzzaman, Mirza
Format: Article
Language:English
Subjects:
Abiotic stress
Antioxidants
Ascorbic acid
Beans
Catalase
Chlorophyll
Environmental stress
French beans
Gene expression
Glutathione
Glutathione reductase
L-Ascorbate peroxidase
Melatonin
Peroxidase
Peroxiredoxin
Phaseolus vulgaris
Photosynthesis
Photosystem II
Reactive oxygen species
Reductases
Salinity
Salinity effects
Salinity tolerance
Salts
Seedlings
Sodium chloride
Superoxide dismutase
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Summary:Melatonin (MT) has been reported to regulate certain plant physiological processes and promote tolerance to different environmental stresses such as salinity. Green bean (Phaseolus vulgaris L. cv. Royal Nel) seedlings were exposed to 200 mM NaCl with or without pre‐treatment with 150 μM MT. Salt stress led to a lower chlorophyll content, a reduced photosynthetic activity, increased reactive oxygen species (ROS) contents, and decreased photosystem II (PSII) activity. The application of exogenous MT to green bean seedlings under salt stress improved photosynthetic activity and alleviated the oxidative damages by enhancing the activity of antioxidant enzymes. The expression of catalase (CAT1), glutathione reductase (GR), superoxide dismutase (CuZnSOD1), ascorbate peroxidase (APX), Peroxiredoxin Q (PrxQ), and 2‐cysteine peroxiredoxin (2‐Cys‐Prx) encoding genes was significantly increased under salt stress in green bean seedling compared with the untreated control. However, plants treated with exogenous MT and NaCl had 28.8, 21.1, 26.1, 20, 26.2, and 22.4% higher CuZnSOD, CAT1, APX, GR, PrxQ, and 2‐Cys‐Prx transcript levels, respectively, compared to NaCl stress alone. Our study revealed the protective mechanisms mediated by exogenous MT application in NaCl stress alleviation and our findings could be used in the management of green bean cultivation in salinity‐prone soils.
ISSN:0031-9317
1399-3054
DOI:10.1111/ppl.13372