| Abstract: | The influence of the toxicity of copper, connected with the absence of a number of macro-elements, was studied in two different populations of Agrostis tenuis Sibth, The tolerant mine population was adapted in contrast to the non-tolerant population to a toxic (heavy metals), acid and low pH soil. The comparison of these two different populations has shown an increase in tolerance in the absence of macro-nutrient elements in the tolerant population. It was thus concluded that the adaptation of the mine populations to the adverse conditions of their surroundings results in their being tolerant not only to the toxicity of the existing metals but also to other unfavourable edaphic factors to which the non-tolerant populations show but minor resistance. As a result, the tolerant populations can withstand longer the selective pressure of their immediate surroundings, to which the non-tolerant populations succumb. |
