Quantitative modeling of photoassimilate flow in an intact plant using the positron emitting tracer imaging system (PETIS)

• Published in: Soil science and plant nutrition (Tokyo) Vol. 51; no. 3; pp. 417 - 423
• Main Authors: Matsuhashi, S.(Japan Atomic Energy Research Inst., Takasaki, Gunma. Takasaki Radiation Chemistry Research Establishment), Fujimaki, S, Kawachi, N, Sakamoto, K, Ishioka, N.S, Kume, T
• Format: Journal Article
• Language: English
• Published: Oxford, UK Taylor & Francis Group 01.06.2005; Blackwell Publishing Ltd
• Subjects: FOTOSINTESIS; NUTRIENT TRANSPORT; phloem; photoassimilates; PHOTOSYNTHESE; PHOTOSYNTHESIS; Positron Emitting Tracer Imaging System; TECHNIQUE DES TRACEURS; TECNICAS DE TRAZADORES; TRACER TECHNIQUES; transfer function analysis; TRANSPORT DES SUBSTANCES NUTRITIVES; TRANSPORTE DE NUTRIENTES
• ISSN: 0038-0768; 1747-0765
• DOI: 10.1111/j.1747-0765.2005.tb00047.x

The photoassimilate flow in an intact plant stem was imaged in real-time and its dynamics was quantitatively described using the Positron Emitting Tracer Imaging System (PETIS). Radioactive 11 CO 2 was fed to a leaf of an intact broad bean (Vicia faba L.) plant, together with air containing an ambient concentration of non-radioactive carrier CO 2 gas. Movies of flow of the 11 C-labeled photoassimilates in the plant body were captured with PETIS. Here we demonstrate that the average flow speeds and the distribution ratios of photoassimilates in the respective nodes and internodes of the observed stem can be estimated by the transfer function analysis, one of the mathematical modeling methods. We also estimated the changes in the spatial distribution of the average flow speeds in the same stem when the fed leaf was exposed to enriched carrier CO 2 gas.