Characteristics and inheritance of the semidwarf mutants of tartary buckwheat (Fagopyrum tataricum gaertn) induced by gamma ray and ion beam irradiation

We obtained 7 semidwarf strains with lodging resistance by irradiating dry Tartary buckwheat seeds with gamma rays and various ion beams. These strains were named IRBFT-6, 20, 38, 45, 63, 67 and 77. These plant types have not been previously observed among Tartary buckwheat genetic resources, so it seemed that they have new characteristics. The populations of Fsub(2) from crosses between IRBFT-6, 20, 45 (semidwarf-mutant lines) and their original varieties fitted a 3:1 segregated ratio of wild type to semidwarf type, suggesting that the semidwarf trait in IRBFT-6, 20, 45 was controlled by a nuclear single recessive gene, respectively. Judging from the plant type (wild versus semidwarf) in Fsub(1) and Fsub(2) of half diallel cross, it was estimated that IRBFT-6, 20, 45 had a common semidwarf gene (sdA) and IRBFT-38, 63, 67, 77 had another semidwarf gene (sdB).