Breeding rice for a changing climate by improving adaptations to water saving technologies

Area of Science:

• Agricultural Science
• Climate Change Adaptation
• Plant Breeding

Background:

• Rice production faces threats from rising temperatures and water scarcity due to climate change.
• Rice cultivation contributes significantly to greenhouse gas emissions through methane release from flooded paddies.

Purpose of the Study:

• To review water-saving technologies in rice cultivation that enhance water use efficiency and reduce methane emissions.
• To examine the breeding challenges and adaptive traits required for direct-seeded and alternate wetting and drying rice systems.

Main Methods:

• Focus on two water-saving technologies: direct-seeded rice and alternate wetting and drying.
• Review of current rice breeding strategies and their adaptation to new cultivation methods.
• Assessment of trait discovery, marker-assisted selection, and population improvement for climate resilience.

Main Results:

• Water-saving technologies reduce flooded periods, improving water use efficiency and lowering methane emissions.
• Traditional rice breeding focused on continuously flooded conditions, necessitating new approaches for water-saving systems.
• Key adaptive traits for new systems include anaerobic germination, seedling vigor, weed competitiveness, root plasticity, and drought tolerance.

Conclusions:

• Shifting to water-saving rice cultivation requires breeding for specific adaptive traits.
• Integrating these traits into elite germplasm is crucial for climate change mitigation and adaptation in rice production.