Analysis of root-to-shoot translocation of Cd in rice cultivars using a positron-emitting tracer imaging system

ポジトロンイメージング技術によるカドミウム輸送特性のイネ品種間差の解析

石川 覚*; 倉俣 正人*; 阿部 匡*; 鈴井 伸郎; 伊藤 小百合; 河地 有木; 藤巻 秀

Ishikawa, Satoru*; Kuramata, Masato*; Abe, Tadashi*; Suzui, Nobuo; Ito, Sayuri; Kawachi, Naoki; Fujimaki, Shu

We analyzed the real-time translocation of Cd from root to shoot among 6 rice cultivars using a positron-emitting tracer imaging system (PETIS). Cd first accumulated at the basal region of the shoot within 2 h after the exposure and the signals were much stronger in high-Cd-accumulating cultivars (indica) than in low-Cd-accumulating ones (japonica). Cd accumulated increasingly at the upper portion of the shoot with time, and the signals were obviously strong in high-Cd-accumulating cultivars. These results suggest that the different ability of root-to-shoot translocation of Cd is closely related to the genotypic variation in shoot Cd accumulation in rice.