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Environmental and Stress Physiology

Phytochelatin Accumulation and Cadmium Tolerance in Selected Tomato Cell Lines ¹

Department of Horticulture, Purdue University, West Lafayette, Indiana 47907

Four cell lines of tomato, Lycopersicon esculentum Mill. cv VFNT-Cherry, were selected for their ability to grow in the presence of up to 6 millimolar CdCl₂. The intracellular Cd concentration in these cells was at least 2.3 times higher than in the medium. Growth in media containing higher concentrations of Cd was accompanied by increased production of Cd-binding phytochelatins and a trend toward accumulation of higher molecular weight phytochelatins. At least 90% of the Cd in the most tolerant cells was associated with Cd-phytochelatin complexes. Cell lines maintained an increased tolerance of Cd in the absence of continuous selection pressure.

¹ Supported in part by U. S. Department of Agriculture grant No. 85-CRCR-1-1653. Journal paper No. 12,840 of the Purdue University Agricultural Experiment Station.

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