Genetic diversity and correlation analysis of starch yield-related traits in sweet potato The Dynamic Change of Starch Synthesis Enzymes during the Grain Filling Stage and Effects of Temperature upon It ANALYSIS OF GENE EXPRESSION OF ENZYMES INVOLVED IN STARCH SYNTHESIS AND ENZYMES ACTIVITY IN WHEAT GRAIN Study on dynamic changes of starch accumulation in grain and related enzymes in winter wheat cultivars with two spike types Effects of Shading in Field on Key Enzymes Involved in Starch Synthesis of Summer Maize