Drought Resistance Screening and Genetic Diversity by SSR Markers in Sorghum Genetic Analysis and Gene-Mapping of Two Reduced-Culm-Number Mutants in Rice Genetic Diversity of Soybean and the Establishment of a Core Collection Focused on Resistance to Soybean Cyst Nematode Inheritance and Gene Mapping of Resistance to Soybean Mosaic Virus Strain SC14 in Soybean Development, identification and utilization of introgression lines using Chinese endemic and synthetic wheat as donors Sampling Method for Genetic Variation Survey in Maize Populations Detected by SSR Markers