Variations in Cd tolerance in plants may be associated with changes in nitrogen and or carbon metabolism. demonstrated medium and high tolerance of Virola surinamensis to Cd. However, study conducted by Andrade Júnior et al. It has been postulated that higher plants are more sensitive to Cd stress. The lower nitrate absorption (NO 3 −), changes in nitrate reductase (NR) activity, proline, total soluble proteins (PST) and total soluble amino acids (TSA) in plants under the effect of Cd have also been observed. High levels of Cd in the soil commonly causes many stress symptoms in plants such alterations in the concentration of starch and soluble carbohydrates in plants tissues. Increased cadmium (Cd) concentration in the environment, caused especially by mining residues and excessive use of phosphate fertilizers, promotes serious imbalances in terrestrial and aquatic ecosystems because it is highly toxic and persistent in the environment, as well as present a high mobility in the soil for plants, being incorporated and bioaccumulated to other components of the food chain, rapidly affecting the growing number of organisms. The increase in TSC, sucrose and proline, suggests a metabolic regulatory mechanism of V. Cd promoted an increase in the concentration of total soluble carbohydrates (TSC), proline, sucrose, and reducing sugars in the plants. The reduction of nitrate reductase (NR) in plants exposed to Cd was followed by a decrease in ammonia, total soluble amino acids (TSA), and total soluble proteins (TSP). In general, Cd did not affect nitrate concentration in the root but had a positive effect on leaves. The used experimental design was a completely randomized design with five Cd concentrations (0, 15, 30, 45, and 60 mg L − 1), for 60 days. ![]() The aim of this study was to assess the nitrogen and carbon metabolism of young plants of Ucuúba ( Virola surinamensis) in the presence of cadmium with the perspective of the phytoremediation of contaminated environments. These ecosystems are susceptible to contamination by Cadmium (Cd), indicating that the plant has strategies for tolerating this metal. Virola surinamensis is a forest species widely distributed in the estuaries of the Amazon.
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