Characteristics and inheritance of the semidwarf mutants of Tartary buckwheat (Fagopyrum tataricum Gaertn.) induced by gamma ray and ion beam irradiation

Abstract

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 F₂ 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 F₁ and F₂ 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).