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Uptake of 14C-Acetic Acid by Rice Plant as Related to Root Function and Microbial Activity on the Root Surface

[+] Author Affiliations
Shinichi Ogiyama, Nobuyoshi Ishii, Shigeo Uchida

National Institute of Radiological Sciences, Chiba, Japan

Paper No. ICEM2009-16111, pp. 689-693; 5 pages
  • ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management
  • ASME 2009 12th International Conference on Environmental Remediation and Radioactive Waste Management, Volume 1
  • Liverpool, UK, October 11–15, 2009
  • Conference Sponsors: Nuclear Engineering Division and Environmental Engineering Division
  • ISBN: 978-0-7918-4407-6 | eISBN: 978-0-7918-3865-X
  • Copyright © 2009 by ASME


Experiments using rice plants (Oryza sativa L.) were conducted to examine uptake of 14 C-acetic acid via the root and 14 C behavior on the root surface. For hydroponics, three types of rice plants were cultured with 14 C-acetic acid solution: complete plant, half-rooted plant, and non-rooted plant. Also, for the root incubation experiment, sterilized root and non-sterilized root were incubated with 14 C-acetic acid solution. The 14 C radioactivities in the plant parts and solution were measured. Non- and half-rooted plant had 14 C radioactivity in their aerial part, but the complete plant did not. The trends of radioactivity levels in the solution were directly opposite to those of plant root biomass. A high level of 14 C radioactivity was observed on the entire root surface of non-sterilized root in the incubation experiment, and 14 C radioactivity in the solution also remarkably decreased from 7 h to 96 h after the 14 C addition. These results suggest that the amount of 14 C-acetic acid absorbed by the plant through the roots is very small. However, the plant absorbs 14 C-acetic acid through breaks in the roots. Once 14 C-acetic acid is inside the plant, it immediately transfers to the shoots. Degradation of 14 C radioactivity in the solution and 14 C fixation on the root surface arise from the context of microbial activities.

Copyright © 2009 by ASME



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