Abstract:

This study examined the effects of different bagging treatments on the soluble sugar contents and sucrose metabolism
of Kiyomi tangor fruits. The results showed that different fruit bagging treatments had different influences on the contents of
soluble sugars. Compared with non-bagged fruits, soluble sugar contents in single bagged fruits were increased significantly.
Non-woven fabric bagged fruits had the highest contents of sucrose, the highest content of fructose was contained in both fruits
wrapped in single yellow bags and those in single white bags, and the content of glucose in single white bags was highest when
the fruits matured. The activities of neutral invertase (NI), sucrose synthase (SS) and sucrose phosphate synthase (SPS) in single
bagged fruits were all increased to some extent, particularly in non-woven fabric bags, and no significant difference in the effect of
double bagging treatment on the activities of NI, SS and SPS was observed at most of the tested sites. Acid invertase (AI) activity
decreased with fruit maturation but was not significantly influenced by bagging treatments. The above results indicated that single
bagging treatment increased the sugar contents by up-regulating the activities of NI, SS and SPS and that the one-layer bag with a
certain light transmittance and light color was suitable for bagging of Kiyomi tangor.

Key words: bagging, Kiyomi tangor, sugar content, invertase, sucrose synthase, sucrose phosphate synthase