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Real-time whole-plant imaging of $$^{11}$$C translocation using positron-emitting tracer imaging system

ポジトロンイメージング技術を用いた全身植物中の$$^{11}$$C標識炭素動態の撮像

河地 有木; 鈴井 伸郎; 石井 里美; 伊藤 小百合; 石岡 典子; 山崎 治明; 岩崎 郁*; 小川 健一*; 藤巻 秀

Kawachi, Naoki; Suzui, Nobuo; Ishii, Satomi; Ito, Sayuri; Ishioka, Noriko; Yamazaki, Haruaki; Iwasaki, Aya*; Ogawa, Kenichi*; Fujimaki, Shu

Elucidation of carbon kinetics in a plant is important from viewpoint of environmental reduction in the amounts of atmospheric carbon dioxide (CO$$_{2}$$) and from an agricultural viewpoint in terms of the growth and development of the plant body. In articular photosynthetic CO$$_{2}$$ fixation and photoassimilate translocation are important topics for understanding the mechanisms underlying carbon kinetics. In this study, we have developed a method to investigate the carbon kinetics by using one of the most powerful radionuclide-based imaging techniques for plant study, that is, the positron emitting tracer imaging system (PETIS). Carbon-11-labeled carbon dioxide ($$^{11}$$CO$$_{2}$$) and PETIS enable video imaging of tracer dynamics of carbon fixation, photosynthesis, and translocation. Because of a large field of view (FOV) provided by the PETIS and the sufficiently small size of soybeans (${it Glycine max}$ cultive Jack) that fit in the FOV, dynamic quantitative PETIS data of gradual changing in $$^{11}$$C activity and $$^{11}$$C distribution throughout the entire intact plant body after pulse-chase $$^{11}$$CO$$_{2}$$ treatment is acquired. This indicates the successful imaging of CO$$_{2}$$ photoassimilate translocation from the time of infusion into leafs to that of distribution of the whole plant body; further, carbon kinetics is analyzable to understand plant physiology and nutrition.

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パーセンタイル:79.21

分野:Instruments & Instrumentation

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