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Developing the rice ideotype: Optimizing traits for methane mitigation and sustainable yield.

Saleem Asif¹, Yoon-Hee Jang^2,3, Rahmatullah Jan³

¹Department of Applied Biosciences, Kyungpook National University, Daegu, 41566, Republic of Korea.

The Plant Journal : for Cell and Molecular Biology

|March 7, 2025

Summary

Rice cultivation is a significant source of methane. This study identified plant traits like shorter culm length and more spikelets per panicle that can reduce methane emissions while maintaining high yields.

Keywords:

culm length grain weight methane emission rice rice ideotype spikelets per panicle

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Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions

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Area of Science:

Agricultural Science
Environmental Science
Plant Science

Background:

Rice (Oryza sativa) is a global staple food, crucial for food security.
Rice paddies are a major anthropogenic source of methane (CH4), contributing ~10% to global agricultural emissions.
Reducing methane emissions from rice is vital for climate change mitigation.

Purpose of the Study:

To identify key agronomic traits correlated with methane emissions in rice.
To analyze the Cheongcheong Nagdong Double Haploid (CNDH) population for trait-emission relationships.
To propose a rice ideotype for reduced methane production and sustained yield.

Main Methods:

Correlation analysis of various plant traits in a 120-member CNDH population.
Evaluation of traits including culm length, spikelets per panicle, and grain weight.
Statistical analysis to determine the relationship between traits and methane emissions.

Main Results:

Shorter culm length correlates with reduced biomass and lower methane production.
Increased spikelets per panicle are associated with higher grain yield and potentially reduced root exudates.
A positive correlation (r=0.51) was observed between grain weight and methane emissions.

Conclusions:

Agronomic traits significantly influence methane emissions in rice.
Selecting for shorter culms and more spikelets per panicle may mitigate emissions.
Further research into genetic and ecological factors is needed for sustainable rice farming systems.