Fig. 4. The influence of cyclosporin A (CsA), Ca²⁺ ions, and palmitic acid on the oxygen uptake in state-4 (nonphosphorylative) respiration of mitochondria from control (a), cold stressed (-4°C, 1 h) with subsequent oxidative stress (0.5 mM H₂O₂, 4 h) (b), and cold hardened (4°C, 7 days) with subsequent oxidative stress (0.5 mM H₂O₂, 4 h) winter wheat shoots. Results are represented as the mean of at least three determinations/experiment. Oxygen uptake at state-4 respiration of mitochondria without any addition is 100%.