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The possible role of metallothioneins in copper tolerance ofSilene cucubalus

✍ Scribed by P. C. Lolkema; M. H. Donker; A. J. Schouten; W. H. O. Ernst

Publisher: Springer-Verlag
Year: 1984
Tongue: English
Weight: 596 KB
Volume: 162
Category: Article
ISSN: 0032-0935
DOI: 10.1007/bf00410215

No coin nor oath required. For personal study only.

✦ Synopsis

Growth and copper-binding of a coppertolerant and a copper-sensitive population of Silene cucubalus (L.) Wib. have been studied. The coppertolerant plants showed a much lower uptake and a proportionally higher transport of copper from root to shoot. A copper-binding protein with an apparent Mr of 8500 resembling metallothionein has been isolated from the roots of copper-treated plants of the tolerant population. After 20 d, the protein was observed to be inducible upon copper supply in the coppertolerant plants, but not yet in the sensitive ones. This could be an indication of a difference in metalregulated synthesis of the protein. Ion-exchange chromatography of the 8 500 protein yielded a major copper-containing fraction eluting at high ionic strength. Other characteristics such as UV absorption and amino-acid composition resembled strongly those of metallothioneins. The involvement of metallothioneins in the detoxification of copper within Cutolerant plants is discussed in relation to other mechanisms.

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