Rice that Beats the Heat

Why It Matters

QT12 provides a tangible genetic lever to maintain rice yield and quality as global temperatures rise, directly supporting food security and farmer profitability.

Key Takeaways

• Gene QT12 on chromosome 12 regulates rice heat response.
• Nighttime heat forces rice to expend energy, reducing yield.
• Disabling QT12 via editing improves starch storage and taste.
• Conventional breeding of non‑responsive QT12 boosts yields under heat.
• Protective QT12 variant can be transferred to japonica varieties.

Summary

The video reports the discovery of a heat‑responsive gene, QT12, on rice chromosome 12 that determines how the grain copes with rising nighttime temperatures. Researchers screened more than 500 rice varieties in heat‑prone regions, cross‑breeding the top performers until they isolated QT12, whose activity spikes during hot nights, diverting energy from protein synthesis toward starch accumulation.

Nighttime heat forces rice plants to burn extra energy reserves to stay cool, leading to chalky, less palatable grains and a measurable drop in overall yield. QT12’s heat‑induced expression reduces protein content while increasing starch storage in the endosperm, directly linking the gene’s activity to the observed quality loss.

By either knocking out QT12 with gene‑editing tools or breeding a version that does not react to heat, scientists produced rice with superior taste and substantially higher yields. The protective QT12 allele was successfully introgressed into cool‑weather japonica strains, demonstrating that the trait can be transferred across diverse genetic backgrounds.

If deployed at scale, the QT12‑based approach could shield rice production from increasingly frequent hot nights, bolstering food security and offering growers a climate‑resilient cultivar without sacrificing grain quality.

Original Description

Crops can tolerate the scorching sunshine of a heat wave if they have enough water, but sweltering nights can spell particularly serious trouble. Researchers in China have discovered a gene that helps protect rice from two impacts of heat: lower yield and poor-quality grain.

CREDITS: (FOOTAGE) LI ET AL./CELL; (IMAGES) LI ET AL./CELL; (VIDEO PRODUCTION) M. CANTWELL/SCIENCE

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