Quantitative evaluation of rice varieties in cadmium uptake activities for remediation of cadmium-contaminated soil

ファイトレメディエーション用イネ品種におけるカドミウム吸収活性の定量的評価

石川 覚*; 鈴井 伸郎; 伊藤 小百合*; 石井 里美; 山崎 治明*; 河地 有木; 石岡 典子; 藤巻 秀

Ishikawa, Satoru*; Suzui, Nobuo; Ito, Sayuri*; Ishii, Satomi; Yamazaki, Haruaki*; Kawachi, Naoki; Ishioka, Noriko; Fujimaki, Shu

In this study, we evaluated the activities on Cd translocation of a few candidate varieties and analyzed the biological mechanisms using a positron-emitting tracer imaging system (PETIS). Three common rice cultivars, Nipponbare, Koshihikari and Sasanishiki and three candidate varieties were subjected. We equally fed the hydroponic culture solution including Cd to the six test plants and obtained the serial images of the Cd distribution in the aerial parts for 36 h using PETIS. As a result, It was found that the three candidate plants accumulated Cd in their aerial parts approximately two times as common cultivars. It was also found that almost all Cd in the culture solution was absorbed by all the tested plants. Therefore, this result indicates that the difference was due to greater activities of the candidates in the process to export Cd from the root tissue to the aerial parts, but not in the process of absorption from the culture.