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Effect of salt stress on superoxide accumulation in leaves from onion plants, detected by histochemical staining with NBT. (A) Control ‘Texas 502’; (B) Salt-treated plants ‘Texas 502’; (C) Detail of the previous picture (D) Control ‘Granex 429‘; (E) Salt-treated plants ‘Granex 429‘; (F) Leaves from salt-treated plant stained in the presence of 10 mM MnCl2.
