Resistance evaluation of soybean germplasms to soybean cyst nematodes Analysis of Genes Resistance to Phytophthora Root Rot in Soybean Germplasm Imported from America Marker-Based Evidence of Broadening the Genetic Base of Chinese Soybeans by Using Introduced Soybeans Studies on Phenotypic Frequency Distribution of Alleles of Peroxidase Activity in Seed Coat and Root Fluorescence of Soybeans in China