Inheritance of Resistance to the Brown Planthopper in Korean Rice Varieties, Milyang No. 30 and Milyang No. 34

The inheritance of resistance to brown planthopper (Nilaparvata lugens Stal.) was studies in six rice varieties made with three susceptible varieties, Milyang No. 21, 23, 29 and three resistant varieties, Milyang No. 30, 34 and IR 34. Seedling reactions to brown planthopper in parents and hybrid populations were checked individually, and the results obtained are summarized as follows. Single dominant genes that are allelic to Bph 1 condition the resistance in Milyang No. 30, and Milyang No. 34. It was also found that the resistance gene in these two varieties was as same as in IR 34, which was known as resistant variety. Milyang No. 21. 23 and 29 varieties were susceptible varieties, and were conditioned by a single recessive gene.