关键词: 桃果实, 营养品质, 抗氧化能力, 呼吸代谢, 调控机制

Abstract: Respiratory metabolism is one of the most important physiological activities of posthavest climacteric fruit, and is also closely related to the biosynthesis of different bioactive compounds. This paper concluded the effect of respiratory metabolism on the biosynthesis and metabolism of antioxidant composition (such as phenolic acid, flavonol, flavan-3-ol, anthocyanin and carotenoids) and key enzymes expressions in postharvest peach fruit of different varieties (Red-flesh, Yellow-flesh, and White-flesh). Based on investigations from the respiration pathway, the paper also discussed the specific mechanism of respiratory metabolism involved in the biosynthesis of such antioxidant compounds, expounded the molecular basis of the biosynthetic pathway and regulation of key enzymes of flavonoids and carotenoids, and clearifed the role and regulation of storage environmental conditions on the antioxdiant properties and antioxidant compounds of harvested fruits during storage. These would provide theoretical basis for regulation of antioxidant compounds metabolism and finally improve the nutritional quality in postharvest fruits.

Key words: peach fruit, nutritional quality, antioxidant capacity, respiratory metabolism, regulation mechanism