Abstract:

In order to explore the caves warehouse storage effect of quality of potato in Minle county, Gansu province. We collected nine cultivars of potatoes from the Minle county, Gansu province to evaluate the starch, reducing sugar content and amylase activity which stored at different storage periods. The results indicate that with the storage period developed, the starch content of the most potatoes were showed increase-decrease-increase-decrease, reducing sugar contents were showed increase-decrease, and amylase activity were showed increase-decrease-increase-decrease. During January to February, the lowest temperature in a year, the starch content and amylase activity reached their minimum level (12.68%-22.47%) and （0.43-0.87 mg/(g?min), respectively, but the reducing sugar achieved their maximum level (0.43%-2.41%).The caves warehouse was of benefit to storage of potato. Pearson correlation matrix analysis showed that, reducing sugar content and amylase activity negatively correlated with starch, but amylase activity positively correlated with reducing sugar content. Between the reducing sugar and starch content had a dynamic balance. From the reducing sugar and starch to analyze these two indexes, ‘Qinshu 6’ and ‘Tongshu 23’ were suitable for cooking using, the three varieties of ‘Atlantic’, ‘Shepody’ and ‘LK-99’ were more suitable for production and processing, and processing has to complete before the February of the next year to assure quality