Abstract
AbstractThe influence of cadmium (Cd) on physiological processes in wheat (Triticum aestivumL.) and maize (Zea maysL.) plants exposed to either optimal mineral nutrition or the absence of magnesium (Mg) as well as the accumulation of cadmium and magnesium in plant organs were studied using the method of water culture in a greenhouse. Cd treatment reduced shoot fresh mass more strongly in Mg-supplied than in Mg-deficient plants. Negative effect of Cd on photosynthetic activity was more pronounced inT. aestivumthan inZ. maysplants. Cd treatment decreased leaf chlorophyll and carotenoid concentration in bothZ. maysandT. aestivum,irrespective of the Mg supply. Cd was preferentially accumulated in the roots of both species. Catalase activity inT. aestivumleaves and roots was unaffected by Cd and Mg supply. Cd treatment did not affect Fe accumulation in the leaves of either species, while in the roots a considerable increase occurred, irrespective of the Mg nutrition. Higher tolerance ofZ. maysandT. aestivumplants to Cd toxicity exposed to Mg deficiency could partly be ascribed to the preservation of Fe nutrition.
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