Abiotic Stress in Rice: Visiting the Physiological Response and Its Tolerance Mechanisms

Area of Science:

• Agricultural Science
• Plant Physiology
• Biochemistry

Background:

• Rice (Oryza sativa L.) is a crucial global staple food, supporting over three billion people.
• Global climate change and abiotic stresses (drought, heat, cold, salt, submergence, heavy metals) severely threaten rice production and grain quality.
• Abiotic stresses impair rice through reduced photosynthesis, chlorosis, leaf wilting, and damage to cellular structures.

Purpose of the Study:

• To review the morphological, biochemical, and physiological defense mechanisms rice plants utilize against multiple abiotic stresses.
• To highlight the molecular and physiological basis of rice quality deterioration under stress.
• To inform the development of stress-tolerant rice cultivars.

Main Methods:

• This review synthesizes existing research on rice plant responses to various abiotic stressors.
• It examines documented morphological, biochemical, and physiological adaptations.
• The review analyzes stress-induced damage and defense strategies.

Main Results:

• Abiotic stresses induce negative effects like reduced photosynthetic efficiency, impaired stomatal conductance, and cellular damage (chlorosis, wilting, necrosis).
• Rice plants exhibit complex responses including stomatal adjustments, leaf rolling, reactive oxygen radical (ROR) production, and activation of antioxidant systems.
• Biochemical and physiological adaptations involve stress-responsive enzymes, osmolytes, ion transporters, and detoxification processes.

Conclusions:

• Rice plants possess multifaceted defense mechanisms to mitigate abiotic stress impacts.
• Understanding these adaptive strategies is essential for breeding rice varieties with enhanced resilience to environmental challenges.
• Developing multi-stress tolerant rice is critical for maintaining global food security.