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Accmulation of superoxide ion by NBT staining in mustard (Brassica juncea L.) at 30 DAS. Plants were grown individually with 0 or 50 μM Cd or with 1 mM SO42- (S), 200 μL L-1 ethephon (E), 1 mM SO42- plus 200 μL L-1 ethephon in presence or absence of Cd.
