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Response to different concentrations of cadmium on the Aspergillus sp CadG1 strain In the last decades there has been a great deal of concerning towards environmental pollution levels, due to the problems it has caused to the human health and also contributing to agricultural yield decreasing. Contamination of the environment with heavy metals is becoming a serious global problem, threatening seriously different ecosystems, particularly those near urban and industrial areas. Heavy metal pollution, caused mainly by cadmium (Cd), is considered one of the more toxic, which is generated by mining and industrial activities (battery manufacturin) and the usage of sewage sludge and phosphate fertilizers. When things are exposed to heavy metals, oxidative damage often occurs, due to the generation of reactive oxygen species (ROS), which can stimulate enzymes responsible for their detoxification, such as peroxidases, superoxide dismutase (SOD), catalase (CAT), glutathione reductase (GR), guaiacol peroxidase and others. The study of these variations may allow obtaining the tolerance levels evaluation, specificity of response and levels of pollution in the environment. These data may be useful in breeding programs to select tolerant microrganisms, besides the studies related to the bioremediation, technique that involves the toxic ions removal, by living organisms, from the environment. There is little information in literature about the antioxidant response of fungus to the effects of the heavy metal cadmium. This work aims to study the variation of antioxidant enzymes in response to different concentrations of cadmium in one Aspergillus sp. strain, CadG1, which is cadmium tolerant. To know the enzymatic behaviour of this strain in response to cadmium, experiments were conducted to determine the dried mass and to study the enzymatic responses in concentrations of 0; 0,2; 0,6; 1,2 and 2,0 mM of CdCl2, and in different times of exposure, 6, 9, 12, 24 e 48 hours, after initial growth for 12 hours in minimum medium. The CadG1 strain show variation in the activities of SOD, CAT and GR in the exposure and concentrations studied periods. It has observed a significant effect on the time, concentration and interaction among these factors on the strain growing and the total proteins amount extracted from the strain mycelium. The results suggest that cadmium induced the formation of hydrogen peroxide (H2O2), which induced the activities of CAT and GR as well.

Respostas enzimáticas da linhagem superior CadG1 de Aspergillus sp. à exposição ao cádmio