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Environmental and Stress Physiology

Brassica juncea Produces a Phytochelatin-Cadmium-Sulfide Complex ¹

U.S. Department of Agriculture/Agricultural Research Service Plant Gene Expression Center, 800 Buchanan St., Albany, California 94710, Department of Plant Pathology, University of California, Berkeley, California 94720, U.S. Department of Agriculture/Agricultural Research Service Water Management Research Laboratory, 2021 S. Peach Ave., Fresno, California 93727

Phytochelatins (PCs) are enzymically synthesized peptides produced in higher plants and some fungi upon exposure to heavy metals. We have examined PC production in the Se-tolerant wild mustard Brassica juncea and found that it produces two types of PC-Cd complexes with the same characteristics as those from fission yeast Schizosaccharomyces pombe, including a high molecular weight PC-Cd-sulfide form.

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