A method to quantitate photosynthetic rate constant within leaf using carbon-11-labeled carbon dioxide and positron emitting tracer imaging system

Author

Kawachi, Naoki ; Sakamoto, K. ; Ishii, S. ; Fujimaki, S. ; Suzui, N. ; Ishioka, N.S. ; Matsuhashi, S.

Author_Institution

Takasaki Adv. Radiat. Res. Inst., Japan Atomic Energy Agency, Takasaki

Volume

5

fYear

2005

fDate

23-29 Oct. 2005

Firstpage

2908

Lastpage

2911

Abstract

Position emitting tracer imaging system (PETIS) and carbon-11-labeled carbon dioxide (¹¹CO₂) can image photosynthesis process in plant leaf, and ¹¹C kinetics make it possible to estimate physiological function parameters in photosynthesis. With an exposure ¹¹CO₂-gas to a leaf, PETIS experiments were performed under four light conditions on a single leaf. In order to estimate the rate constants of photosynthesis parameters, time activity curves of ¹¹CO₂ gas input and leaf response were fitted to an appropriate compartmental tracer kinetic model, which applies influx and efflux for photo-assimilation and photosynthate delivery rate constants respectively. These results are reasonable response against light environment and important to discuss photosynthesis in plant physiology and agriculture

Keywords

imaging; photosynthesis; radioactive tracers; ¹¹CO₂-gas; agriculture; carbon-11-labeled carbon dioxide; compartmental tracer kinetic model; photoassimilation; photosynthetic rate constant; physiological function parameters; plant leaf; plant physiology; positron emitting tracer imaging system; time activity curves; Carbon dioxide; High-resolution imaging; Image analysis; In vivo; Kinetic theory; Mathematical model; Parameter estimation; Physiology; Plants (biology); Positrons;

fLanguage

English

Publisher

ieee

Conference_Titel

Nuclear Science Symposium Conference Record, 2005 IEEE

Conference_Location

Fajardo

ISSN

1095-7863

Print_ISBN

0-7803-9221-3

Type

conf

DOI

10.1109/NSSMIC.2005.1596939

Filename

1596939