Fruit of 'Lidongben'longan(Dimocarpus longan Lour. cv. Lidongben), a late mature cultivar in Fujian Province in China was used to study the effects of pre -harvest bagging at 80, 95 and 110 days after full bloom on quality and post-harvest behaviour.The results were as follows: Fruit pre-harvest bagging could obviously improve appearance quality of longan fruit, also increase contents of total soluble solids, total sugars, vitamin C and soluble protein in pulp of longan fruit. Whereas, fruit pre-harvest bagging could decrease content of titratable acidity in longan pulp, effectively improve fruit quality of longan. Fruit pre-harvest bagging increased contents of total phenolics and activity of peroxidase(POD)in pericarp of longan fruit, which were closely related to pericarp browning of longan fruit, thus, pre-harvest bagging promoted the occurrence of pericarp browning during longan fruit storage. Meanwhile, fruit pre-harvest bagging could obviously increased the developments of aril breakdown and post-harvest diseases of longan fruit which resulted in reducing fruit storability and shortening storage life of longan fruit. From the results it can be seen that fruit pre-harvest bagging could obviously improve appearance quality and pulp nutritional quality of 'Lidongben' longan fruit, and the results suggested that the optimum pre-harvest bagging period of 'Lidongben'longan fruit was 110 days after full bloom, i.e., about 1 month before harvest. Whereas, pre-harvest bagging shorten storage life of longan fruit.%以福建省晚熟龙眼品种‘立冬本’果实为材料,研究果实采前套袋时期(盛花后80 d、95 d、110d)对龙眼果实品质和采后贮藏特性的影响.结果表明:果实采前3个不同套袋时期都可以可明显改善龙眼果实的外观品质,提高果肉可溶性固形物、总糖、维生素C和可溶性蛋白质等营养物质含量,降低可滴定酸含量.果实采前套袋提高了与龙眼果皮褐变密切相关的总酚含量和过氧化物酶活性,促进龙眼果实贮藏期间果皮褐变的发生；同时,果实采前套袋促进龙眼果实采后果肉自溶和病害发生,降低果实耐贮性,缩短龙眼果实贮藏期.综合研究结果认为,果实采前套袋能有效改善‘立冬本’龙眼果实的外观品质和营养品质,其最佳套袋时期为盛花后110 d(即果实采收前1个月左右)；但果实采前套袋降低‘立冬本’龙眼果实的耐贮性,不利于延长龙眼果实贮藏期.
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