Abstract
Heavy metal tolerant plants have no mechanism of preventing heavy metal to enter the cell, with the exception of developing a low exchange capacity in the roots. The significant feature of metal tolerance is the prevention of heavy metals from exerting disturbance in the metabolic system of the cells. In roots of some heavy metal tolerant plants the cell wall play an impotant role in acting as a heavy metal accumulator. In leaves and stems, however, the cell vacuole system is the main place of heavy metal deposition. Some microorganisms excepted, angiospermous plants have not developed heavy metal resistant enzymes or specific heavy metal rich metabolites. The physiological basis of tolerance is the increase in the production of malate and oxalate in zinc tolerant plants and of phenolic compounds in copper tolerant populations. It is suggested that these properties fulfil the conditions of the high specifity of heavy metal tolerance, according to the different stability constants. The maintainance of tolerance require so much energy that tolerant plants have a lower biomass production and that they are not able to withstand the competition with non-tolerant populations on normal soils.
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Ernst, W. (1975). Mechanismen der Schwermetallresistenz. In: Verhandlungen der Gesellschaft für Ökologie Erlangen 1974. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-4521-5_20
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DOI: https://doi.org/10.1007/978-94-017-4521-5_20
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