Effects of bagging with different paper bags on fruit growth and quality of pineapple

The effects of fruit bagging on fruit growth and quality were studied in pineapple fruit [Ananas comosus(L.) cv.Smooth Cayenne] with three different types of paper bags(one-layer white paper bag,two-layer yellow-out-dark-in paper bag and kraft paper bag).The results showed that bagging could promote the color and luster,and prevent pineapple fruits from sunburn.However,bagging significantly decreased the growth rate of fresh fruit weight and single fruit weight.At the same time,bagging affected the nutritive quality of pineapple fruit to some extent and decreased the fruit taste.Soluble protein,chlorophyll and carotenoid contents significantly decreased after fruit bagging.Additionally,titratable acidity,total soluble sugars and Vitamin C content significantly decreased in fruits with one-layer white paper bag,while total soluble sugars significantly decreased but Vitamin C content significantly increased in fruit with two-layer yellow-out-dark-in paper bag,yet total soluble solid significantly decreased but total soluble sugars and Vitamin C content significantly increased in fruit with kraft paper bag.In comprehensive consideration,white paper bag should be recommended according to fruit quality and marketability of pineapple.