S06 - Session P11 - Sensor applications, sensor and model for climate management in controlled environments - Photosynthetic performance of strawberry acclimated to the solar spectrum modified by spectrum conversion film in greenhouses

Authors: Jun Hyeun Kang *, Hyo In Yoon, Jung Eek Son

Functional films have been used in greenhouses to improve the light environment for plant growth. Among them, a spectrum conversion film converting the green light of incident sunlight into red light has been reported to increase the crop productivity. However, the results are not always consistent, and the reasons for the improvement are not fully understood. The objectives of this study were to reveal the cumulative effects of a green-to-red spectrum conversion film on the electron transport and photosynthetic performance of strawberry. The photosynthetic efficiency, leaf optical properties, chlorophyll content, chlorophyll fluorescence, growth, and fruit qualities when the plant was grown under polyethylene film (control) and spectrum conversion films were evaluated. The sunlight modified by spectrum conversion film did not change the leaf optical properties and chlorophyll content but significantly increased the chlorophyll fluorescence parameters related to reduction end electron acceptors at PSI acceptor side and the efficiency of electron transport. Without an increase in nonphotochemical quenching, the effective quantum yield of PSII and PSI of leaves grown under the spectrum conversion film were significantly higher than those parameters when grown under PE. At 48 days after transplanting, the photosynthetic efficiency and photosynthetic rates of leaves and whole plants increased significantly under the spectrum conversion film compared to the control. The vegetative growth was not affected by the spectrum conversion film, but the fruit weight, sweetness, acidity, and firmness were significantly improved. These results indicated that sunlight modified by spectrum conversion film stimulates electron flow and improves photosynthetic capacity and fruit quality of the strawberry. (This work was supported by the MOTIE 10052798)