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Exogenous nitric oxide promotes salinity tolerance in plants: A meta-analysis
Md Tahjib-Ul-Arif1, Xiangying Wei2, Israt Jahan3
1Plant Biology and Biofunctional Chemistry Lab, Department of Biochemistry and Molecular Biology, Bangladesh Agricultural University, Mymensingh, Bangladesh.
Frontiers in Plant Science
|November 24, 2022
Summary
Exogenous nitric oxide (NO) enhances plant salt tolerance by improving growth and yield. Optimal application involves seed priming or foliar pre-treatment at 0.1-0.2 mM NO, especially for dicots under prolonged stress.
Area of Science:
- Plant Science
- Environmental Stress Physiology
- Biochemistry
Background:
- Nitric oxide (NO) is recognized for enhancing plant defense mechanisms and improving salinity tolerance.
- Optimal application parameters for exogenous NO remain unclear due to diverse experimental conditions.
Approach:
- A meta-analysis was conducted to elucidate NO's physiological and biochemical mechanisms in salt tolerance.
- Investigated the impact of plant and application method factors on NO-mediated salt tolerance.
Key Points:
- Exogenous NO significantly improves biomass, growth, and yield under salinity stress.
- Seed priming and foliar pre-treatment are most effective NO application methods.
- Optimal NO concentration is 0.1-0.2 mM, effective up to 150 mM NaCl, with benefits increasing with stress duration (>21 days).
- NO is most beneficial during germination and seedling stages, particularly in dicots.
Conclusions:
- Exogenous NO alleviates salt-induced oxidative damage and enhances plant growth and yield.
- Mechanisms include regulating osmotic balance, mineral homeostasis, photosynthesis, reactive oxygen species metabolism, and antioxidant defenses.
- Future research should address lipid metabolism, reproductive stages, C4 plants, field-level impacts, and economic viability.
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