In situ experimental exposure of fruit-bearing shoots of apple trees to 13CO2 and construction of a dynamic transfer model of carbon

Evaluating the transfer and metabolism of carbon (C) in apple fruit is key to estimating the potential accumulation of atmospheric 14C in fruit near and around nuclear facilities. We developed a dynamic compartment model for apple fruit-bearing shoots, assuming that the shoots are a simple unit of s...

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Bibliographic Details
Published in:Journal of environmental radioactivity 2021-07, Vol.233, p.106595-106595, Article 106595
Main Authors: Imada, Shogo, Tani, Takashi, Tako, Yasuhiro, Moriya, Yuki, Hisamatsu, Shun'ichi
Format: Article
Language:English
Subjects:
Exposure experiment
Fruiting shoot
Growth rate
Photoassimilate translocation
Stable carbon isotope
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Summary:Evaluating the transfer and metabolism of carbon (C) in apple fruit is key to estimating the potential accumulation of atmospheric 14C in fruit near and around nuclear facilities. We developed a dynamic compartment model for apple fruit-bearing shoots, assuming that the shoots are a simple unit of source and sink for photoassimilates. Fruit-bearing shoots of Malus domestica “Fuji” at different fruit growth stages were exposed to 13CO2in situ, followed by sampling at 72 h after exposure or at harvest. The 13C/(13C+12C) mole ratio in fruits, leaves, and current branch were measured to construct a five-compartment model of 13C (fruit, each fast and slow component of leaves, and current branch). The C inventories in the compartments were presented in accordance with the measured growth curves of C in the organs. The model simulated the 13C dynamics in plant tissues well. Simulation results of photoassimilate distribution using the model indicated that the retention of photoassimilated C at the harvest depended on the growth rate of C in the organs at the exposure. [Display omitted] •In-situ13CO2 experiments of exposure to apple fruit-bearing shoots were conducted.•13C distribution ratio in fruit was higher during the middle of growth stage.•A dynamic compartment model was constructed for shoots using the experimental data.•The model well simulated the short and long-term distribution of assimilated C.•The model can be used for evaluating atmospheric 14C transfer to an apple fruit.
ISSN:0265-931X
1879-1700
DOI:10.1016/j.jenvrad.2021.106595