Kinetic analysis of carbon-11-labeled carbon dioxide for studying photosynthesis in a leaf using positron emitting tracer imaging system

Kawachi, Naoki; Sakamoto, Koichi*; Ishii, Satomi; Fujimaki, Shu; Suzui, Nobuo; Ishioka, Noriko; Matsuhashi, Shimpei

The positron emitting tracer imaging system (PETIS) and carbon-11-labeled carbon dioxide ( $^{11}$ CO $_{2}$ ) can be used for imaging the photosynthesis process in plant leaves. Further, $^{11}$ C kinetics facilitate the estimation of the physiological function parameters of photosynthesis. PETIS measurements were performed under four light conditions for each exposure of a single leaf to $^{11}$ CO $_{2}$ gas. In order to estimate the rate constants of the photosynthesis parameters, the time-activity curves of the input $^{11}$ CO $_{2}$ gas and the leaf response were fitted to an appropriate compartmental tracer kinetic model that considers photoassimilation and sucrose export rate constants as influx and efflux, respectively. The data obtained by this method show a reasonable response with respect to the photoenvironment of the leaf, and they are important for discussing photosynthesis with regard to plant physiology and agriculture.

Language	:	English
Journal	:	IEEE Transactions on Nuclear Science
Volume	:	53
Number	:	5
Pages	:	p.2991 - 2997
Publication Year/Month	:	2006/10
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Paper URL	:	https://doi.org/10.1109/TNS.2006.881063
DOI for research data	:
Keywords	:	no keyword
Research Facility	:	TIARA(イオン照射研究施設)
Press Release	:
Article of JAEA R&D Review	:	Functional Diagnosis of Photosynthesis in a Leaf; Quantitative Kinetic Analysis of Photosynthetic Functions Using Positron Emitting Trace r Imaging System (PETIS)[/]
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Registration No. : AA20060926
JAEA Abstracts No. : 35000529
Paper Submission No. : 2003

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