Effects of SSⅢ 1,SBE3 and PUL on Eating and Cooking Qualities of Rice under the Background of Backcross Inbred Lines Protoplast preparation and induced screening of alkaline pullulanase producing bacterium Studies on screening and breeding of alkaline pullulanase producing bacterium and regulation of nutrition Type, Activity, and Purification of Starch-Debranching Enzymes during Grain Filling Period in Wheat