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Arginase-specific activities, and Arg and Orn levels in tobacco plants. A, Specific activities in L, P, and I. L, Apical and marginal leaf lamina; P, acropetal petiole; I, internode; arginase, ⋄ with dotted line; Arg, □; Orn, ○. B, Arginase activities (μmol Orn h−1 mg−1 protein) and endogenous levels of Arg and Orn (nmol mg−1 protein) in shoot apex, primary root, and secondary root. Error bars represent ±se.
