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

摘要： 桃果实为典型的跃变型果实，需要经历呼吸跃变才能成熟可食。呼吸代谢是 跃变型果实采后重要的生理活动之一，与果实采后抗氧化物质的形成存在密切的联 系。本文从桃果实采后呼吸跃变生理入手，总结了桃果实采后主要酚酸、黄酮醇、 黄烷-3-醇、花色苷和类胡萝卜素消长的规律，并进一步从桃果实采后呼吸代谢中 间产物及关键酶与上述次生物质代谢关键酶的基因表达水平探讨呼吸代谢对果实采 后抗氧化能力的影响作用，明确呼吸代谢在桃果实采后抗氧化活性过程中的可能作 用机制。

关键词: 桃果实, 营养品质, 抗氧化能力, 呼吸代谢, 调控机制