Studies on the Chemical Constituents of Saponins of the Stems and Leaves of Panax ginseng C. A. Meyer Construction of A Soybean Genetic Linkage Map and Mapping QTLs Resistant to Soybean Cyst Nematode (Heterodera glycines Ichinohe) SOYBEAN BREEDING THROUGH CROSS BREEDING COMBINED WITH IRRADIATION MUTATION Discovery of a Cytoplasmically Inherited Virescent Mutant of Soybean Development and Identification of InDel Marker Based on rhg1 Gene for Resistance to Soybean Cyst Nematode(Heterodera glycines Ichinohe)