Cloning of Maize Starch Branching Enzyme Gene and Construction of RNA Interference Vector Effects of SSⅢ 1,SBE3 and PUL on Eating and Cooking Qualities of Rice under the Background of Backcross Inbred Lines Optimization of genetic transformation system of potato and introduction of maize starch branching enzyme gene SBEⅡb into potato Constitution and Spatiotemporal Expression of Starch Branching Enzyme in Developing Wheat Grain Relationship between Isozyme Genotypes and Activities of Starch Branching Enzyme in Wheat Grain Effects of RNA Interference of SBE3 Gene Expression on Starch Accumulation and Key Enzymes Activities Involved in Starch Synthesis in Transgenic Rice Grain