As compared with other crops, the researches of sweet potato has long-term not been enough concerned, resulting in slow progress in molecular biology accumulation. Differences amylase were found in isozyme composition in tuberous roots of sweet potato during storage period, by eletrophoresis on 8% native polyacrylamide gel and active stain by using soluble starch as substrate. New amylase responds differently to inhibitors, it is sensitive to EDTA or thiol -group reagent, it is more sensitive to tompurature than β-amylase .
