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Effect of chilling stress (18 °C and 12 °C) on chloroplast biogenesis of rice seedlings. Plastid ultrastructure of etiolated seedlings (A); chloroplast ultrastructure after 48 h of greening under normal temperature (28 °C) condition (B); chloroplast ultrastructure after 48 h of greening at 18 °C (C); chloroplast ultrastructure after 48 h of greening at 12 °C (D). G: granum; SL: stroma lamellae; GL: grana lamellae; SG: starch grain. Bar = 1 μm.
