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Severe heat stress reduces seed size. A, Images of developing rice seeds at 24, 48, 72, and 96 HAF under control (28°C) conditions. This stage is characterized by rapid increase in seed size. B, Seeds collected from plants exposed to severe heat stress (42°C) imposed at 24 HAF for 2 d show a decrease in the size of developing seeds. Bars = 1 mm.
