Articles
Validation of the estimated photosynthetic rate of komatsuna (Brassica rapa L. var. perviridis) plants in a plant factory with artificial light using an optical simulation
Article number
1423_2
Pages
9 – 16
Language
English
Abstract
The lighting designs, including lamp light distributions and optical properties of structures, dictate the light environment in a plant factory with artificial light.
Optical simulations have emerged as a valuable tool for estimating both the light environment and net photosynthetic rates (Pn) of plants, facilitating the evaluation of lighting designs in such facilities.
Our previous study validated the accuracy of estimating photosynthetic photon flux density (PPFD) on cultivation panels, demonstrating a mean absolute percentage error (MAPE) of 4.5%. However, the estimation accuracy of the Pn of plants was not confirmed.
In this study, we measured the Pn of komatsuna (Brassica rapa L. var. perviridis) plants using an assimilation chamber at three levels of PPFD (104.6, 198.0, and 269.0 µmol m‑2 s‑1). Subsequently, three-dimensional plant models of komatsuna were developed and Pn was estimated by using optical simulation and the models of the plants and the assimilation chamber.
We then compared the measured and estimated Pn.
The mean absolute error and MAPE of the estimated leaf Pn were determined to be 0.93 µmol m‑2 s‑1 and 13.6%, respectively.
Discrepancies in estimated Pn were attributed to errors in estimated PPFD, the difference in air current environments between the chamber and the cultivation room where plant materials were prepared, and the omission of photosynthesis of other plant parts other than the leaf blades.
We additionally measured the photosynthetic rates of komatsuna plants with or without leaf blades.
The photosynthetic rates of komatsuna plants without leaf blades were 3-7% of those with leaf blades.
Optical simulations have emerged as a valuable tool for estimating both the light environment and net photosynthetic rates (Pn) of plants, facilitating the evaluation of lighting designs in such facilities.
Our previous study validated the accuracy of estimating photosynthetic photon flux density (PPFD) on cultivation panels, demonstrating a mean absolute percentage error (MAPE) of 4.5%. However, the estimation accuracy of the Pn of plants was not confirmed.
In this study, we measured the Pn of komatsuna (Brassica rapa L. var. perviridis) plants using an assimilation chamber at three levels of PPFD (104.6, 198.0, and 269.0 µmol m‑2 s‑1). Subsequently, three-dimensional plant models of komatsuna were developed and Pn was estimated by using optical simulation and the models of the plants and the assimilation chamber.
We then compared the measured and estimated Pn.
The mean absolute error and MAPE of the estimated leaf Pn were determined to be 0.93 µmol m‑2 s‑1 and 13.6%, respectively.
Discrepancies in estimated Pn were attributed to errors in estimated PPFD, the difference in air current environments between the chamber and the cultivation room where plant materials were prepared, and the omission of photosynthesis of other plant parts other than the leaf blades.
We additionally measured the photosynthetic rates of komatsuna plants with or without leaf blades.
The photosynthetic rates of komatsuna plants without leaf blades were 3-7% of those with leaf blades.
Authors
K. Saito, H. Yoshida, S. Hikosaka, E. Goto
Keywords
assimilation chamber, light environment, photosynthetic photon flux density, plant three-dimensional model, structure from motion
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