套袋枇杷果面微域环境变化对果实品质的影响

Effect of microenvironment on quality of bagged loquats

以贵妃枇杷为试材,用3种果袋进行套袋,对袋内微域环境的光照强度(简称光强)、温湿度和透气性进行测定,并分析不同果袋内微域环境变化和果实品质及两者之间的相关性。结果表明:套袋使微域环境中的日均光强下降,果实外观品质有不同程度的提高,表现在光洁度好、着色均匀、果粉和茸毛较完整、日灼果率和锈斑病下降;内在品质表现在可溶性固形物含量和总糖含量下降,可滴定酸含量和Vc含量增加,风味偏酸偏淡;日均光强对果实的可溶性固形物含量、总糖含量的影响均呈正相关,但对可滴定酸含量、Vc含量的影响均呈负相关,对可滴定酸含量的影响最大,相关系数为-0.9766,相关性显著(P<0.05)。

Using three different kinds of bags to enclose Gui-fei loquat fruits, the light intensity, temperature, humidity and ventilation in the microenvironment were determined. The relationship between the conditions inside the bag and the fruit quality was established. The results showed that the bagging caused decreases in sunlight intensity, while improving the fruit＇s exterior and flesh qualities in varying degrees. Externally, the fruit skin had a clean, shiny appearance with even, attractive color, powdery and fuzzy coatings, and few burned or rust spots. The flesh showed decreases in soluble solids and sugar contents, increases in titratable acids and vitamin C, as well as an increased sour taste and somewhat reduced flavor. The soluble solids and total sugar contents were positively related to the average daily sunlight intensity; whereas, the titratable acids and vitamin C were negatively related to the sunlight intensity. Among the factors investigated, their greatest effect was on the content of titratable acids, with a correlation coefficient of -0. 9766 （P〈0.05）.