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Imaging of $$^{107}$$Cd translocation in oilseed rape plants treated with different Cd concentrations

Suzui, Nobuo; Fujimaki, Shu; Ishioka, Noriko; Kawachi, Naoki; Matsuhashi, Shimpei; Hattori, Hiroyuki*; Chino, Mitsuo*; Nakamura, Shinichi*

Cadmium (Cd) is one of toxic heavy metal element. In order to decrease Cd accumulation in these products, it is necessary to elucidate mechanisms of Cd long-distance transport in the plant body. In this research, we tried to elucidate mechanisms of Cd long-distance transport by visualizing Cd transport in the plant body using positron emitting tracer imaging system (PETIS) and $$^{107}$$Cd. Oilseed rape plants (Brassica napus L.) were grown hydroponically for two weeks after sowing. In this PETIS experiment, different concentrations of Cd (0.1 $$mu$$M and 10 $$mu$$M) were added as a carrier to hydroponic solutions. 0.1 $$mu$$M is comparable to the Cd concentration in the soil solution from non Cd-polluted soils. 10 $$mu$$M is comparable to the toxic Cd concentration for oilseed rape plants. As a result, the pattern of Cd accumulation in the oilseed rape plants was similar in the different Cd concentrations (0.1 $$mu$$M and 10 $$mu$$M). These results indicate that in early stages, Cd concentration in the hydroponic solution do not have effects on Cd absorption in the root systems.



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