title: Migration of (14)C in the paddy soil-to-rice plant system after (14)C-acetic acid breakdown by microorganisms below the plow layer.
abstract: Migration of (14)C derived from (14)C-acetic acid was examined by using soils sampled from paddies in four administrative areas in Japan (Aomori, Yamanashi, Ehime and Okinawa) and rice plant in a tracer experiment to understand the fate of (14)C in the paddy soil-to-rice plant system. The loss of (14)C radioactivity levels derived from (14)C-acetic acid was caused by soil microorganism breakdown. A part of the (14)C fixation to soil was caused by microbial assimilation into the fatty acid fraction. (14)C moved upward via two different types of (14)C dynamics in soil: quick movement upward; and constant but slow movement upward. (14)C was highly assimilated into the plant panicle and that was caused by the root-uptake and the transfer of (14)C. Migration of (14)C derived from (14)C-acetic acid relied heavily upon changes of chemical forms and characteristics of (14)C-compound as caused by microorganisms in soil.
authors.affiliation: Office of Biospheric Assessment for Waste Disposal, National Institute of Radiological Sciences, 4-9-1 Anagawa, Inage-ku, Chiba 263-8555, Japan. ogiyama@nirs.go.jp
authors.forename: Shinichi
authors.initials: S
authors.lastname: Ogiyama
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Takeda
authors.forename: Nobuyoshi
authors.initials: N
authors.lastname: Ishii
authors.forename: Shigeo
authors.initials: S
authors.lastname: Uchida
mesh_terms: D019342:Acetic Acid / Q000737:chemistry / Q000378:metabolism*; D000383:Agriculture; D001673:Biodegradation, Environmental; D002250:Carbon Radioisotopes / Q000737:chemistry / Q000378:metabolism*; D005843:Geography; D007564:Japan; D012275:Oryza / Q000254:growth & development / Q000378:metabolism*; D018517:Plant Roots / Q000254:growth & development / Q000378:metabolism*; D012988:Soil Microbiology; D012990:Soil Pollutants, Radioactive / Q000378:metabolism*; D013997:Time Factors
chemical_list: D002250:Carbon Radioisotopes; D012990:Soil Pollutants, Radioactive; D019342:Acetic Acid