[Influence of Ca2+ ions on metabolism of active oxygen species in combined cultures of wheat calluses with the fungus Tilletia caries].

The effect of Ca2+ on morphophysiological parameters of calluses of wheat Triticum aestovum L., the level of active oxygen species, and the activity of oxalate oxidase, peroxidase, and catalase is investigated in the case of infestation with the fungus Triticum aestivum causing ball smut. The concentration of O2-, H2O2, and activity of oxidoreductases (oxalate oxidase, peroxidase, and catalase) depends on the content of Ca2+ ions in the culture medium of calluses. The increase in the concentration of Ca2+ ions in the culture medium led to higher structuring of calluses, induction of activity of oxalate oxidase and of some forms of peroxidase, and to accumulation of active oxygen species. These changes contributed to inhibition of development of the fungus. Discovery of such dependence agrees with the role of calcium as the intermediary in biochemical reactions related to the formation of the protective response of plant cells in case of infestation.