Comparison of
O-labeled and
F-labeled water uptake in a soybean plant by PETIS (Positron Emitting Tracer Imaging System)
Nakanishi, Tomoko*; Yokota, Harumi*; Tanoi, Keitaro*; Ikeue, Natsuko*; Okuni, Yoko*; Furukawa, Jun*; Ishioka, Noriko; Watanabe, Satoshi; Osa, Akihiko
; Sekine, Toshiaki; Matsuhashi, Shimpei; Ito, Takehito*; Kume, Tamikazu; Uchida, Hiroshi*; Tsuji, Atsunori*
O-Labeled and
F-Labeled water uptake manner in a soybean plant was compared by PETIS (Positron Emitting Tracer Imaging System).
O-Labeled water (half-life: 2 min) and
F-Labeled water (half-life: 110 min) were produced by a cyclotron by
N(d,n)
O and
O(
,pn)
F 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 accumlated every 15 s till 20 min. It was found that
F-labeled water was taken up much faster than
O-labeled water, suggesting that in
F-labeled water, fluorine was moved in the form of
F-ion. When BAS image of
O-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.