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1 Department of Physics, Chemistry and Pharmacy, Faculty of Science, SDU 2 Montpellier University 3 INRA Avignon 4 Universite de Bejaia 5 UMR AGAP 6 UMR AGAP 7 Department of Physics, Chemistry and Pharmacy, Faculty of Science, SDU
Nondestructive studies of physiological processes in agronomic products require increasingly higher spatial and temporal resolutions. Nuclear Magnetic Resonance (NMR) imaging is a non-invasive technique providing physiological and morphological information on biological tissues. The aim of this study was to design a robust and accurate quantitative measurement method based on NMR imaging combined with contrast agent (CA) for mapping and quantifying water transport in growing cherry tomato fruits. A multiple flip-angle Spoiled Gradient Echo (SGE) imaging sequence was used to evaluate the intrinsic parameters maps M 0 and T 1 of the fruit tissues. Water transport and paths flow were monitored using Gd 3+/[Fe(CN)6]3-/D - mannitol nanoparticles as a tracer. This dynamic study was carried out using a compartmental modeling. The CA was preferentially accumulated in the surrounding tissues of columella and in the seed envelopes. The total quantities and the average volume flow of water estimated are: 198 mg, 1.76 mm 3/h for the columella and 326 mg, 2.91 mm 3/h for the seed envelopes. We demonstrate in this paper that the NMR imaging technique coupled with efficient and biocompatible CA in physiological medium has the potential to become a major tool in plant physiology research. © 2014 Elsevier Inc.
Clinical M R I, 2014, Vol 32, Issue 10, p. 1418-1427
Cherry tomato; Compartmental modeling; Contrast agents; Intrinsic parameters; Quantitative NMR imaging
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