Mutational effect of -rays and carbon ion beams on seedlings

シロイヌナズナ植物体における線と炭素イオンビームの変異効果

吉原 亮平; 長谷 純宏; 野澤 樹; 坂本 綾子; 鳴海 一成

Yoshihara, Ryohei; Hase, Yoshihiro; Nozawa, Shigeki; Sakamoto, Ayako; Narumi, Issei

To elucidate the molecular mechanisms of mutagenesis by ion beams in higher plant seedlings, mutational effects of ion beams an -rays were investigated. Mutant frequency was increased by the irradiation of both radiations. Deletion/insertion and G to A transition were major mutations induced by both radiations. However, base change mutations induced by oxidized guanine (G to T and A to C) were not increased in seedlings as in dry seeds, suggesting that the effects of oxidized guanine induced by ionizing radiation may be lower in plant than in other organisms irrespective of LET.