Abstract
Peking, a high resistant variety to the soybean cyst nematode, was crossed reciprocally with incompletely resistant Nemashirazu and susceptible Shiromeyutaka. F2 progenies of them were tested for the resistance, for which also relationships with some other characters were examined. Frequencies of the resistant plants were 1/4 for Peking X Nemashirazu, and near to 1/16 for Peking X Shiromeyutaka, thus, indicating one, for the former, or two, for the latter, recessive genes are concerned with the resistance. In these crosses a coupling linkage between the resistance and i allele which determine the exprcssion of seed coat color to black or brown was found. This resistant recessive gene was determined as “rhg1”.
