Analysis of the activity of oxidative enzymes by multivariate regression in the presence of Mg²⁺ oyster mushroom mycelium

Studies have been conducted to optimize the process of deep cultivation of the Oyster mushroom mycelium. The process of obtaining mycelium as a seed for cultivation of fruiting bodies of mushrooms has been improved. The effect of different concentrations of magnesium carbonate (Magnesium carbonates) on the growth characteristics of mycelium of the fungus Pleurotus ostreatus during deep cultivation has been studied. The dependence of enzyme activity on the concentration of metal in the nutrient medium of germinating mycelium of oyster mushrooms has been revealed. The method for determining the activity of catalase by spectrophotometric method has been adapted for the studied objects. For the first time the data on the activity of mycelium catalase and superoxide dismutase enzymes in the presence of magnesium carbonate additive have been obtained. It has been found that the application of magnesium carbonate in low concentrations has a positive effect on the growth of mycelial biomass of the fungus Pleurotus ostreatus, since with increasing concentration (Mg²⁺) a decrease in biomass growth rate and catalase activity has been observed, presumably due to the participation of magnesium in creating a certain ionic concentration at which catalase inactivation begins. The possibility of applying the method of multivariate regression in the form of the principal components analysis (PCA) has been studied. The redox state of Pleurotus ostreatus culture at the level of enzyme components of the antioxidant defense system during submerged cultivation of basidomycetes has been analyzed, which showed how the obtained variables with different measurement units are interconnected. The account graphs also clearly indicate the dependence of mycelial growth on the concentration of the additive used. The introduction of the cultivation conditions proposed in this work in the practice of mushroom production potentially contributes to a more successful resistance of macromycetes to biotic and abiotic stress. The results of the research are relevant to the development of the fundamentals of the science of fungi.

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