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Effect of 0·05 mm B (control) and B toxicity (0·5 and 2 mm) on (A) MDHAR, (B) DHAR and (C) GR activity in leaves of two tomato cultivars: ‘Kosaco’ and ‘Josefina’. Bars represent means ± s.e. (n = 9); for each cultivar, bars followed by the same letters are not significantly different using Duncan's test (P = 0·05).
