Abstract
The nature of the resistance to inLestation with the azuki bean weevil was investigated in the progeny of crosses between two susceptible mung bean (Vigna radiata) cultivars, Osaka-ryokutou and No. 3-ryokutou, and a resistant wild mung bean (V. sublobata) strain, TC 1966. The F1 and, F2 seeds from the crosses were subjected to test for the detection of the weevil resistance. Segregation of the F2 plant populations derived from the crossesfor the resistance was examined by subjecting the F3 seeds obtained from individual F2 plants to the same test. The results indicated that the weevil resistance of TC 1966 was controlled by a single dominant gene for which the gene symbol R was proposed. Two backcrosses were made to Osaka-ryokutou with selection for the weevil resistance. In the BC2F2 generation, mungbean type-resistant plants whose seeds showed similar morphological traits such as seed size and seed coat color to those of Osaka-ryokutou were obtained.
