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The effect of exogenous melatonin on chloroplast ultrastructure in the WT (A–D), nia1nia2noa1 (E–H), and c-PTIO-treated (I–L) Arabidopsis plants. Seven-day-old seedlings were treated with or without 5 μM melatonin in the presence or absence of 50 μM Fe for 8 days. Then the leaves from these plants were sampled for transmission electron micrographic analyses of the chloroplast ultrastructure: (A,E,I), +Fe; (B,F,J), +Fe + MT; (C,G,K), −Fe; (D,H,L), −Fe + MT; Scale bar = 1 μm.
