Abstract
The photosynthetic rates of leaves depend on the vertical position and cultivation conditions. However, few models have been proposed to express photosynthesis according to leaf position, and there was a lack of quantitative analysis between physiological indicators and model parameters. The objectives of this study were to analyze the leaf photosynthetic characteristics of paprika plants according to leaf vertical position using photosynthesis models, and to analyze the relationship between the total nitrogen content and the photosynthetic model parameters. Leaf photosynthetic rates at different vertical positions were measured under varying light intensities and CO2 concentrations in triplicate. Rectangular hyperbola and FvCB (Farquhar, von Caemmerer, and Berry) models were selected, calibrated, and validated as multivariable photosynthesis models. Total nitrogen contents and SPAD values were measured at each leaf position and the coefficients of the photosynthetic rate models were compared. The R2 values for the rectangular hyperbola and FvCB models were 0.86 and 0.91, and the RMSE values were 4.651 and 2.104, respectively. Total nitrogen content linearly increased with increasing vertical leaf position and it was linearly related to the maximum carboxylation capacity and maximum electron transport rate, estimated in the FvCB model. In this study, the FvCB model was considered more suitable for expressing the relationship between total nitrogen contents and plant’s physiological responses according to the vertical position of leaves. The vertical leaf photosynthetic rate models established in this study will contribute to determining optimal environmental conditions for maximizing crop photosynthesis and establish the criteria for precise CO2 enrichment in greenhouses.
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Acknowledgements
This research was supported by the MSIT (Ministry of Science and ICT), Korea, under the Grand Information Technology Research Center support program (IITP-2020-0-01489) supervised by the IITP (Institute for Information & communications Technology Planning & Evaluation).
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Conceptualization, methodology, and investigation, DHJ, IH, JYS and JES; resources and data curation, DHJ, IH and JYS; writing and editing, DHJ and JES; funding acquisition, JES.
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Communicated by Young Yeol Cho, Ph.D.
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Jung, D.H., Hwang, I., Shin, J. et al. Analysis of leaf photosynthetic rates of hydroponically-grown paprika (Capsicum annuum L.) plants according to vertical position with multivariable photosynthesis models. Hortic. Environ. Biotechnol. 62, 41–51 (2021). https://doi.org/10.1007/s13580-020-00295-x
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DOI: https://doi.org/10.1007/s13580-020-00295-x