果袋透光性对宁海白枇杷果实品质及抗氧化能力的影响

Effect of different light transmittance paper bags on fruit quality and antioxidant capacity in Ninghaibai loquat cultivar

以白沙枇杷品种宁海白为试材,分析了白色单层、黄色单层、外浅黄内白双层、黄色双层和外灰内黑双层等5种不同透光率纸袋套袋对枇杷果实品质以及抗氧化能力的影响。结果表明,套袋能提高果实表面的明亮度。套袋后果实的总糖含量较对照下降,下降程度随果袋透光率性的下降而增强,其中外灰内黑纸袋与对照相比差异达到显著水平。套袋还降低了果实的总酚含量、类黄酮含量和果实的抗氧化能力,其中以透光性低的外灰内黑双层纸袋下降最大;但对类胡萝卜素含量影响较少。套袋后果实的抗氧化能力下降,与总酚和类黄酮含量降低呈显著正相关。

Five different light transmittance paper bags including one-layer white paper bag, one-layer yellow paper bag, two-layer （outer pale yellow and inner white） paper bag, two-layer yellow paper bag and two-layer （outer gray and inner dark） paper bag were used for studying the effects of bagging on fruit quality and antioxidant capacity of Ninghaibai white fleshed loquat cuhivar （Eriobotryajaponica Lindl）. The results showed that fruit bagging improved the surface lightness of loquat fruit. The bagged fruit had a lower total sugar content than that of control ; the extent of sugar content decrease was intensified with the decrease of light transmittance of bags. But compared with control, only outer-gray-inner-dark two-layer paper bagging treatment significantly decreased the total sugar content. Bagging treatments also decreased the total phenolic and flavonoid content, and as well as fruit antioxidant capacity. The lowest antioxidant capacity also occurred in the fruit bagged with two-layer outer-gray-inner-dark paper bag. Correlation analysis showed the decrease of total antioxidant capacity in bagged fruit was correlated to the decrease of the content of total phenolic and flavonoid in bagged fruit. According to above results, the higher light transmittance paper bag was more suitable for bagging for Ninghaibai loquat cuhivar.