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Report No.

Direct imaging and analysis of root uptake for cadmium using $$^{107}$$Cd

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

In this study, we have developed direct imaging of $$^{107}$$Cd in underground parts using a positron-emitting tracer imaging system (PETIS), and applied the method to analyse the time-varying distribution of Cd in the high- and low-Cd accumulating rice cultivars. The hydroponic culture solution including $$^{107}$$Cd were fed to the six individual cultivars, and the serial images of the $$^{107}$$Cd distribution in the both underground and aerial parts were obtained for 24 h using PETIS and newly developed method of direct imaging of $$^{107}$$Cd root uptake. As a result, the serial images of $$^{107}$$Cd uptake by the roots of rice cultivars was successfully obtained. Time courses of Cd amounts demonstrated that decrease of Cd in the culture solution was similar but retention of Cd in the roots was drastically different between the high- and low-Cd accumulating cultivars. The low-Cd accumulating cultivars showed rapid saturation curves of Cd amount in the roots, whereas the high-Cd accumulating cultivars were characterized by curves with a peak within 30 min after $$^{107}$$Cd supplementation, and a subsequent steep decrease. These results indicate that the high-Cd accumulating cultivars have a less ability to retain Cd in the root tissue compared with the low-Cd accumulating cultivars, resulting in higher Cd accumulation in the shoots.



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