Involvement of a metallothionein-like copper complex in the mechanism of copper tolerance in Mimulus guttatus
- 22 May 1986
- journal article
- research article
- Published by The Royal Society in Proceedings of the Royal Society of London. B. Biological Sciences
- Vol. 227 (1249), 493-501
- https://doi.org/10.1098/rspb.1986.0036
Abstract
The possible involvement of a metallothionein-like copper complex in the mechanism of copper tolerance in Mimulus guttatus has been examined. In the roots of copper-tolerant plants, after exposure to copper, a constant proportion of the total copper content is bound to this complex. The complex is present in the roots of both copper-tolerant and non-tolerant plants, and is also induced in the roots of both by increased exposure to copper. Differences in the amount of the complex in the roots of copper-tolerant and non-tolerant plants suggest that it may be involved in the mechanism of copper tolerance. However, only a small proportion (6%) of the copper in the roots of the copper-tolerance clone is bound to the complex after growth in a high concentration (16 .mu.M) of copper; this result suggests that the mechanism of tolerance does not simply involve the sequestration of all excess copper by the complex. The complex may have a transient function in the mechanism of copper tolerance.This publication has 8 references indexed in Scilit:
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