Enhancing plant drought tolerance through exogenous nitric oxide: a comprehensive meta-analysis

Area of Science:

• Plant Physiology
• Agricultural Science
• Biochemistry

Background:

• Drought stress poses a significant threat to plant growth and agricultural productivity.
• Developing strategies to enhance plant drought tolerance is crucial for food security.
• Exogenous nitric oxide (NO) is explored as a potential enhancer of plant stress resilience.

Purpose of the Study:

• To evaluate the effects of exogenous nitric oxide (NO) on plant growth under drought stress.
• To assess NO's impact on photosynthetic efficiency, antioxidant defense, and osmoregulation.
• To synthesize findings from multiple studies through a meta-analysis.

Main Methods:

• Meta-analysis of 48 peer-reviewed studies.
• Quantitative synthesis of data on plant growth parameters.
• Analysis of physiological and biochemical responses to NO treatment under drought.

Main Results:

• Exogenous NO significantly improved shoot and root growth, photosynthetic rates, and leaf water content.
• NO application enhanced antioxidant enzyme activities and osmotic adjustment, reducing oxidative stress markers.
• Effectiveness of NO varied based on environmental factors, plant species, and application methods.

Conclusions:

• Exogenous NO effectively improves plant growth and physiological functions under drought stress.
• Tailoring NO application methods, concentrations, and environmental conditions is essential for maximizing benefits.
• Findings support the use of NO in strategies for enhancing crop resilience and sustainable agriculture.