Abstract
The degree of adaptation of plants to changes in environmental factors, new environmental conditions depends on the composition of chlorophylls and carotenoids, which are the main photoreceptors of photosynthetic cells. However, the degree of exposure of plants to the pigment complex depends on the type of plant, growth conditions, the composition and concentration of toxicants and the duration of their action. The article describes the effect of heavy metal ions on the photosynthetic pigments of 14-day-old corn varieties (Turan-170, Turan-480, Kazakhstan-435, Tauelsizdik-20), resistant and non-resistant varieties. During the experiment, we concluded that the varieties Turan-170, Turan-480, Tauelsizdik-20 are resistant, and Kazakhstan-435 are intolerant in terms of the content of carotenoids, chlorophyll-a, chlorophyll-b pigments in corn varieties (Figures 2,3,4,5). This is because Kazakhstan-435 may have varietal characteristics. In general, heavy metals have a negative effect on plants, reduce the content of chlorophyll and carotenoids, cause shifts in the structure of the membranes of chloroplasts, which negatively affects the intensity of photosynthesis.