Abstract:

The peach fruits of cultivar “Yuhua No. 3” were used to investigate the effects of changes of active oxygen and mitochondria respiratory metabolism-related enzymes on the maturation of peach fruit. Significant peaks of respiratory intensity lagged behind the rapid change of fruit firmness exist, and there is an accumulation trend in the content of active oxygen along with the intensification of peach fruit maturation. The results also showed that the content of Ca2+ in mitochondria increases during the maturation of peach fruits, while the activities of SDH, CCO, H+- ATPase and Ca2+-ATPase decrease at different degrees in the later period of maturation. It is preliminarily revealed that there is a close relationship between active oxygen metabolism and mitochondrial respiration, and both of them probably play an important role in the ripening and aging of peach fruit.

Key words: peach fruit, maturation, active oxygen, mitochondria respiratory metabolism-related enzymes