Effects of Heavy Metals on Assimilatory Sulfate Reduction in Pea Roots

Schmutz, Daniel; Rüegsegger, Adrian; Brunold, Christian (1990). Effects of Heavy Metals on Assimilatory Sulfate Reduction in Pea Roots. In: Rennenberg, Heinz; Brunold, Christian; de Kok, Luit J.; Stulen, Ineke (eds.) Sulfur nutrition and sulfur assimilation in higher plants. Proceedings of tbe Workshop Sulfur Metabolism (pp. 241-243). The Hague, The Netherlands: SPB Academic Publishing bv

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The high content of cysteine in the heavy metal sequestring phytochelatins (ɣ-Glu-Cys)n Gly (n =2-11) led to the prediction that plants cultivated with heavy metals should contain increased levels of the enzymes involved in cysteine formation. Indeed, root sections of pea seedlings grown with Cd2+ contained adenosine 5'-phosphosulfate sulfotransferase activity that was up to almost 20 fold higher than in controls. There was a parallel increase in glutathione synthetase, indicating that glutathione (ɣ-Glu-Cys-Gly) is involved in phytochelatin synthesis.

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