Simulation of dry matter partitioning in cucumber fruits: reflecting gas exchange characteristics based on leaf position and cropping type

Abstract

This study aimed to predict dry matter partitioning in cucumber fruit (Cucumis sativus L.) by developing a simulation model that integrates photosynthetic characteristics based on leaf age and cropping type. Leaf gas exchange, growth, and environmental data from semi-forcing and forcing cropping types were used to calibrate models including the Farquhar-von Caemmerer-Berry (FvCB) model and other growth-related models. The FvCB model revealed reduced Vcmax and Jmax values in older leaves across all cropping types, with semi-forcing crops showing higher photosynthetic capacities than forcing crops. Simulation results showed that, in predicting dry matter partitioning to fruit, the leaf-position-specific simulation model exhibited higher average R² and lower RMSE (g m⁻²) compared to the leaf position-independent model, which applied the middle leaf FvCB model across all leaf ranks. Additionally, bias comparisons indicated greater consistency in the leaf-position-specific model. This approach allows growers to optimize environmental strategies by utilizing photosynthetic data form each leaf position. However, to further improve canopy-level predictions, future models should incorporate the temperature dependence of mesophyll conductance and the effects of photoperiodicity. This study underscores the value of integrating physiological and environmental complexities into crop simulation models, providing a foundation for enhanced predictions and the development of improved crop management strategies across various cultivation scenarios.

Acknowledgments

This study was conducted with financial assistance from the Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, and Forestry (IPET) through the Technology Development Program of the Ministry of Agriculture, Food, and Rural Affairs (MAFRA), South Korea (Project No. RS-2024-00399654).

Author contributions

H.R.S., Y.H.M., S.Y.B., and S.K.K. conceived and designed the experiments, Y.J.K., N.K.K., J.W.L., and T.H.K. performed the experiments. H.S.S., T.Y.L., and S.B.J. analyzed the data. H.R.S., Y.H.M., S.Y.B., and S.K.K. wrote the manuscript. All authors discussed the results and reviewed the final manuscript.

Data availability

The data underlying this article are available in the article and in its online supplementary material.

Conflict of interest statement

The authors declare no competing interests.

Supplementary data

Supplementary data is available at Horticulture Research online.

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