Scientists Discover Gene to Help Rice Escape Heat and Protect Yields

In a significant breakthrough for global food security, scientists from Japan's National Agriculture and Food Research Organization (NARO), other Japanese research institutions, and the International Rice Research Institute (IRRI) have discovered a gene that enables rice to avoid heat stress. The gene, known as EMF3 (Early Morning Flowering 3), prompts rice plants to flower earlier in the day when temperatures are cooler. This shift helps the plant bypass the peak heat hours of 10:00 AM to noon, when high temperatures disrupt fertilization and cause grain sterility.

The discovery centers on a rare variant of the gene, called emf3-1D, which shifts flowering time by approximately 1.5 hours. According to the research team, this modification is highly effective because it acts specifically on the flower-opening mechanism without negatively impacting the plant's overall growth or productivity under normal conditions. By protecting the most vulnerable stage of the rice plant's development, this discovery ensures that farmers can maintain stable yields even in the face of increasingly frequent heat waves and global warming.

Researchers are already working to integrate the emf3-1D allele into widely grown rice varieties, including IR64, Swarna, and Pusa Basmati, using marker-assisted selection and advanced gene-editing techniques like prime editing. Scientists believe this breakthrough offers a practical and scalable tool for breeding climate-resilient rice crops globally. As climate change continues to threaten production in tropical and subtropical regions, this "early riser" trait provides a promising pathway to secure harvests for farmers and improve food stability.

For more details, read the news article in IRRI News.