Sucrose metabolism and changes of relative enzymes in Mangifera indica L. 'Irwin'
2013
Wei, Chang-bin | Wu, Hong-xia | Ma, Wei-hong | Wang, Song-biao | Sun, Guang-min
To understand the sucrose metabolism in ‘Irwin’ mango (Mangifera indica L. 'Irwin') and reveal how the relative enzymes change in this metabolic process, we monitored the changes in soluble sugar content, activities of metabolic relative enzymes, titratable acid concentration, starch content and activities of amylase from green ripe stage to commercial ripe stage. In the fruit of 'Irwin' mango, the contents of soluble sugars were determined to be sucrose (81.79 mg/g)> fructose (30.15 mg/g)> glucose (9.95 mg/g). There was no obvious difference in the activities of acid invertase (AI), neutral invertase (NI), sucrose synthase (SS), sucrose phosphate synthase (SPS) before harvest, but did in the postharvest ripening period where the activities of AI, SS, SPS rose remarkably, SPS activity even peaked, while NI activity just increased slightly. After harvest, glucose content presented a rise-fall trend; fructose content increased gently, and showed a sharp ascent after harvest; sucrose content rose slightly before harvest, and accumulated rapidly even peaked after harvest. These results suggest that the key period of sugar metabolism in 'Irwin' mango is postharvest stage, where the sucrose accumulation accounts for the most and SPS acts crucial role.
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