Comparison of 15O-Labeled and 18F-Labeled Water Uptake in a Soybean Plant by PETIS (Positron Emitting Tracer Imaging System).
Tomoko M. NAKANISHI, Harumi YOKOTA, Keitaro TANOI, Natsuko IKEUE, Yoko OKUNI, 大國 曜子, Noriko S. ISHIOKA, Satoshi WATANABE, Akihiko OSA, Toshiaki SEKINE, Shinpei MATSUHASHI, Takehito ITO, Tamikazu KUME, Hiroshi UCHIDA, Atsunori TSUJI · RADIOISOTOPES · 2001
15O-Labeled and 18F-labeled water uptake manner in a soybean plant was compared by PETIS (Positron Emitting Tracer Imaging System) . 15O-Labeled water (half-life: 110 min) and 18F-labeled water (half-life: 2 min) was produced by a cyclotron by 14N (d, n) 15O and 16O (α, pn) 18F reactions, respectively. A root of a soybean plant was cut off and each labeled water was supplied from the basal part of the plant. The gamma-rays emitted from the sample was measured by a BGO counter with a detection area of 5 cm × 15 cm. The radioactivity from each stem was accumulated every 15 s till 20 min. It was found that 18F-labeled water was taken up much faster than 15O-labeled water, suggesting that in 18F-labeled water, fluorine was moved in the form of 18F-ion. When BAS image of 15O-labeled water in a plant after 5 min and 10 min of water supply was taken, it was found that the labeled water was observed only in the lowest internode, between a root and the first leaves.