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Effects of $$gamma$$-ray irradiation on oxalate metabolism in ${it Rumex obtusifolius}$ L.

Kitano, Sayaka*; Miyagi, Atsuko*; Ono, Yutaka; Hase, Yoshihiro; Narumi, Issey*; Uchimiya, Hirofumi*; Kawai, Maki*

${it Rumex obtusifolius}$ (Polygonaceae) highly accumulates soluble oxalate in leaves. Animals should restrict their intake of oxalate because high level of oxalate causes the poisoning. Therefore, ${it R. obtusifolius}$ well growing in the meadow is a target of weeding. In this study, we aimed to develop a low oxalate ${it R. obtusifolius}$ plant that can be used as a pasture by radiation breeding. Plants from seeds irradiated with several doses of $$gamma$$ rays were used to analyze the radiation effect on oxalate content and other metabolite profiles. As a result, the oxalate content in leaves was decreased by $$gamma$$-ray irradiation. Plants with low oxalate content commonly contained increased level of amino acids and reduced level of organic acids.



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