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Mutational effect of $$gamma$$-rays and carbon ion beams on ${it Arabidopsis}$ seedlings

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 $$gamma$$-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 ${it Arabidopsis}$ 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.

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