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We developed a new cultivar of Tartary buckwheat (Fagopyrum tataricum Gaertn.), 'Darumadattan'. This is the first semidwarf Tartary buckwheat cultivar to be developed by mutation breeding using gamma-ray irradiation. In 1999, 100 dry seeds of the leading Japanese cultivar, 'Hokkai T8' (known at that time as 'Hokkei 1', were gamma-ray-irradiated with a total dose of 500 Gy (25 Gy/h × 20 h) at the Institute of Radiation Breeding (IR, National Institute of Agrobiological Sciences, Hitachiomiya, Ibaraki, Japan. The seeds were sown in Augus