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Live-imaging evaluation of the efficacy of elevated CO$$_{2}$$ concentration in a closed cultivation system for the improvement of bioproduction in tomato fruits

Yamazaki, Haruaki*; Suzui, Nobuo; Yin, Y.-G.; Kawachi, Naoki; Ishii, Satomi; Shimada, Hiroaki*; Fujimaki, Shu

To maximize fruit yield of tomatoes cultivated in a controlled, closed system such as a greenhouse or a plant factory at a limited cost, it is important to raise the translocation rate of fixed carbon to fruits by tuning the cultivation conditions. Elevation of atmospheric $$^{11}$$CO$$_{2}$$ concentration is a good candidate. In this study, we employed a positron-emitting tracer imaging system (PETIS), which is a live-imaging technology for plant studies, and a short-lived radioisotope $$^{11}$$C to quantitatively analyze immediate responses of carbon fixation and translocation in tomatoes in elevated CO$$_{2}$$ conditions. We also developed a closed cultivation system to feed a test plant with CO$$_{2}$$ at concentrations of 400, 1500 and 3000 ppm and a pulse of $$^{11}$$CO$$_{2}$$. As a result, we obtained serial images of $$^{11}$$C fixation by leaves and subsequent translocation into fruits. Carbon fixation was enhanced steadily by increasing the CO$$_{2}$$ concentration, but the amount translocated into fruits saturated at 1500 ppm on average. The translocation rate had larger inter-individual variation and showed less consistent responses to external CO$$_{2}$$ conditions compared with carbon fixation.

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Category:Biotechnology & Applied Microbiology

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