Influence of exogenous hydrogen peroxide on antioxidant system of wheat chloroplast

The effect of different concentrations (1 mM and 10 mM) of exogenous Н 2О 2 on activity of superoxide dismutase (SOD), glutathione reductase (GR) and glutathione transferase (GT) was studed using isolated chloroplasts of 14-day seedlings of heat stable wheat of the Sharg variety. It was shown, that under conditions, which exclude synthesis of SOD and GT, their activities increase and this causes additional protection of plastids at the early stage of the extreme factors’ action. The rise of Н 2О 2 dose results in the increase of GR stability.