Changes in carbohydrates and enzyme activities of sweetpotato lines during storage
1995
Changes in carbohydrates and enzyme activities during storage were studied using four sweetpotato lines. The cultivar Benihayato (BH) showed significantly high levels of sucrose, dextrin, alpha-amylase, and sucrose synthase (SUS) at the late stage of storage. The starch content of BH was significantly decreased. In contrast, the line Kyukei 123 (Q123) showed a low content of sucrose during storage and its SUS activity was decreased. The starch content and alpha-amylase activity of Q123 were almost constant during storage. The other two lines showed traits intermediate between those of BH and Q123. The dextrins produced during storage were analyzed by high-performance anion-exchange chromatography and had a close relationship with alpha-amylase activity in each line. These results showed the key role of alpha-amylase in starch degradation and the possible role of SUS in sucrose accumulation for varietal differences in carbohydrate changes in sweetpotato roots.
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