Effects of controlled atmosphere storage on respiratory metabolism of apple fruit tissue

摘要

AbstractThe effects of CO2and O2concentrations commonly used in fruit storage upon various respiratory processes in apple fruit tissue have been investigated. In manometric experiments 10 CO2inhibited CO2release from succinate supplied to peel discs by over 50; CO2release from malate was inhibited at high substrate concentrations, while CO2release from pyruvate was not affected. High CO2concentrations also inhibited14CO2release from succinate 1,4‐14C and succinate 2,3‐14C supplied to peel discs. It is concluded that succinate dehydrogenase is the respiratory enzyme most affected by CO2concentration.Oxygen uptake was found to be 50 inhibited at ambient concentrations of 0.5 O2for cortical tissue and 5 O2for peel tissue. It is concluded that cytochrome oxidase is responsible for O2uptake in peel and cortical tissue. The apparent low affinity for O2in peel respiration may be due to limited O2diffusion through the tissue. It is concluded that O2uptake by the bulk of the apple is not directly affected by O2concentrations employed in fruit stor