REDOX IMBALANCE EFFECTS GENERATED BY HIGH CONCENTRATIONS OF CADMIUM-ZINC IN Glycine max L LEAVES

CV GATICA AGUILAR; LV GALLARDO; ME CIMINARI; MB TORRES BASSO

Congreso; XXXV Reunión Científica Anual de la Sociedad de Biología de Cuyo; 2021

Sociedad de Biología de Cuyo

REDOX IMBALANCE EFFECTS GENERATED BY HIGH CONCENTRATIONS OF CADMIUM-ZINC IN Glycine max L LEAVES. Large parts of the world?s soils are contaminated by heavy metals. Zinc is an essential microelement for plants, but in excessive concentrations it causes alterations in physiological, biochemical and molecular processes. Cadmium, on the other hand, is a heavy metal without biological functions and also causes harmful effects at cellular and molecular levels. Due to the resemblance of both ions and that they share the same transporters too, toxicity symptoms are similar, such as reduction in biomass, decreased elongation and darkening of roots, chlorosis and necrosis in leaves. Changes in oxidative stress parameters are also generated. The study objective was to determine stress tolerance mechanisms generated by the Cd/Zn pair, evaluating the biochemical and physiological changes Glycine max L leaves. They were obtained after 10 days of plant development under hydroponics in Hoagland´s nutrient solution conditions and subjected to contamination with the two ions (Zn and Cd) during 6 days. The ZnCl2 concentrations used in the study were: 0, 0.6 and 4.8 mM and 40μM of CdCl2, as a constant concentration. Morphophysiological parameters were measured: Fresh Weight (PF), stem length (LT), root length (LR), leaf area (AF), and photosynthetic pigments (Chlor) and carotenes (Car). MDA content was measure as a parameter of oxidative stress and antioxidant enzymes CAT and APX activities. The results showed a significant decrease (p