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PLANT PHYSIOLOGY , Vol 104, Issue 1 255-261, Copyright © 1994 by American Society of Plant Biologists
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ENVIRONMENTAL AND STRESS PHYSIOLOGY |
Phytochelatins in Cadmium-Sensitive and Cadmium-Tolerant Silene vulgaris (Chain Length Distribution and Sulfide Incorporation)
J. A. de Knecht, M. van Dillen, PLM. Koevoets, H. Schat, JAC. Verkleij and WHO. Ernst
Department of Ecology and Ecotoxicology, Vrije Universiteit, De Boelelaan 1087, 1081 HV Amsterdam, The Netherlands
In response to a range of Cd concentrations, the root tips of Cd-tolerant
plants of Silene vulgaris exhibit a lower rate of PC production accompanied
by a lower rate of longer chain PC synthesis than those of Cd-sensitive
plants. At the same Cd exposure level, stable PC-Cd complexes are more
rapidly formed in the roots of Cd-sensitive plants than in those of
tolerant plants. At an equal PC concentration in the roots, the PC
composition and the amount of sulfide incorporated per unit of PC-thiol is
the same in both populations. Although these compounds might play some role
in mechanisms that contribute to Cd detoxification, the ability to produce
these compounds in greater amounts is not, itself, the mechanism that
produces increased Cd tolerance in tolerant S. vulgaris plants.
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