Sucrose metabolism in Irwin mango (Mangifera indica L.) during maturation.
Wei ChangBin, Wu HongXia, Ma WeiHong, Wang SongBiao, Sun GuangMing
Author Affiliation: Southern Subtropical Crops Research Institute, Chinese Academy of Tropical Agri. Sci., Guangdong Zhanjiang 524091, China.
Southwest China Journal of Agricultural Sciences 21 : 972-974
Abstract : Sucrose metabolism in mango (M. indica cv. Irwin) during maturation was studied. Among the soluble sugars, sucrose was dominant (81.79 mg/g), followed by fructose (30.15 mg/g) and glucose (9.95 mg/g). The activities of acid invertase [?-fructofuranosidase] (AI), neutral invertase (NI), sucrose synthase (SS) and sucrose-phosphate synthase (SPS) did not show significant fluctuations before harvesting; however, the activities of AI, SS and SPS increased significantly, whereas the activity of NI increased slightly during the post-harvest period. At this stage, SPS activity peaked. The glucose content increased, then decreased, during the postharvest period. Fructose increased slightly before harvesting and markedly increased after harvesting; a similar pattern was recorded for sucrose, and sucrose content was highest during harvesting. Sugar in mango was metabolized mainly at the postharvest period. SPS was a key factor contributing significantly to sucrose metabolism.