Several Problems Concerning Poplar Heredity and Breeding Inheritance of Resistances to Soybean Mosaic Virus Strains SC4 and SC8 in Soybean Inheritance,Mapping and Qrigin of the Yellow-Seeded Traits in Brassica juncea Study on the allelism of boron efficiency genes in Brassica napus STUDY OF THE NUMBER AND ALLELISM OF RESTORING GENES IN PHOTOPERIOD SENSITIVE GENIC MALE STERILE RICE Fine Mapping of Resistance Genes to SMV Strains SC6 and SC17 in Soybean