Ultrastructure of chloroplast in P. cathayana males and females under different temperatures. (A) 25 °C, males; (B) 25 °C, females; (C) 15 °C, males; (D) 15 °C, females; (E) 4 °C, males; (F) 4 °C, females. Gr, granum; M, mitochondrion; P, plastoglobule; SG, starch grain; V, vacuole; vs, small vesicle; pm, plasmalemma.