Inducible Cadmium Binding Complexes of Cabbage and Tobacco 1

AUTOR(ES)

Wagner, George J.

RESUMO

Cadmium complexes with apparent molecular weights of 10,000 were observed in aqueous extracts of Cd-treated cabbage (Brassica capitata L., cv. red danish) and tobacco (hybrid of Nicotiana glauca and N. langsdorffii) plants. The amount of complex (as Cd) recovered was found to be dependent on the concentration of the metal in the growth medium and the total time of exposure of plants to the metal. Induction of the complex at moderate levels of 112Cd exposure was monitored after labeling the complex with 109Cd in vitro. The constitutive nature of the ligand of the complex in cabbage and tobacco leaves was suggested when control plant extracts were exposed to 109Cd. Such extracts contained 109Cd, which eluted from Sephadex G-50 in the region of Cd complex. Simultaneous labeling with 112Cd and 35S or 32P indicated that the complex contained sulfur but probably not phosphorus. The amount of 35S which eluted coincident with 112Cd complex increased during complex induction. No evidence was found for the presence of 10,000 molecular weight Cd complex in stem exudates (vascular sap) of Cd-treated plants.

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