Hormone Contents in Kernels at Different Positions on an Ear and Their Relationship with Endosperm Development and Kernel Filling in Maize Changes in Carbohydrate Accumulation and Activities of Enzymes Involved in Starch Synthesis in Maize Kernels at Different Positions on an Ear during Grain Filling Response to high temperature of Cleistogenes songorica seed dormancy from different positions Relationship between post-anthesis dry matter remobili-zation from culm, leaf in different position and grain growth of Indica rice varieties Baguixiang and Guihuazhan