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Conference Paper: Stability of Pure Even-aged Conifer Stands in Portugal
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ABSTRACT: Chemical fungicides used to manage plant diseases may negatively impact beneficial fungi, such as entomopathogens. In this study, the participation of the antioxidative system in the entomopathogenic fungi Beauveria bassiana exposed to the copper-based fungicide Bordeaux mixture and their relation with fungus growth and development were examined. The fungus was grown in submerged culture containing Bordeaux mixture at the recommended dose. Within the first 24h of elicitation the vegetative growth, germination, sporulation, activity of amylase and laccase, and the antioxidative enzymes, catalase (CAT) and superoxide dismutase (SOD) as well as the production of hydrogen peroxide (H2 O2 ) were evaluated. Bordeaux mixture inhibited B. bassiana germination (between 65-88%) and sporulation (between 15-57%), and significantly increased laccase production (≥130%), especially within the first 4h of fungi exposure. By contrast, the mycelial growth was found to be less affected by the fungicide. These effects were coincident with a significant increase of H2 O2 levels in fungal cells as well as of SOD activity, but not of CAT, showing clear signs of increased oxidative stress. The effect of Bordeaux mixture on B. bassiana development was probably caused by the toxicity of the copper ion itself and also to induce an oxidant state.
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