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0 reviewsSUMMARYRising global temperatures threaten crop grain quality and yield; however, how temperature regulates grainquality and how to achieve synergistic thermotolerance for both quality and yield remain unknown. Here, weidentified a rice major locus, QT12, which negatively controls grain-quality field thermotolerance by disrupting endosperm storage substance homeostasis through over-activating unfolded protein response (UPR).Natural variations in QT12 and an NF-Y complex form a natural gene on-off system to modulate QT12 expression and thermotolerance. High temperatures weaken NF-YB9/NF-YC10 interactions with NF-YA8, releasingQT12 suppression and triggering quality deterioration. Low QT12 expression confers superior quality and increases elite rice yield up to 1.31–1.93 times under large-scale high-temperature trials. Two trait regulatoryhaplotypes (TRHs) from co-selected variations of the four genetically unlinked genes in NF-Ys-QT12 wereidentified for subspecies thermotolerance differentiation. Our work provides mechanistic insights intorice field thermotolerance and offers a proof-of-concept breeding strategy to break stress-growth andyield-quality trade-offs.