Study on physiological responses of wasabi to light frequency in a smart farm

Jae-Hoon Park1*, Do-Hun Ryu1, Young-Han You1

(1Department of Biological Science, Kongju National University)

Abstract: Sunflecks play a crucial role in the light environment for shade-adapted plants. In this study, we investigated the photosynthetic responses of Eutrema japonica under artificial sunflecks using pulsed LED light in a smart farm system. Light frequencies were set at 20, 60, 180, 540, 1620, and 4860 Hz, with duty ratios of 30%, 50%, and 70%. We measured photosynthetic rate, transpiration rate, stomatal conductance, substomatal CO₂ partial pressure, A/Ci, and water use efficiency. Results showed that photosynthetic rate remained unchanged across duty ratios, but transpiration rate and stomatal conductance increased at higher duty ratios. Water use efficiency was lower at 70%, indicating water stress. While transpiration rate and stomatal conductance decreased with increasing frequency, other physiological responses remained unaffected. These findings suggest that E. japonica thrives best under sunfleck conditions with a 30–50% duty ratio and low light frequency (~20 Hz).

사사: 본 결과물은 환경부의 재원으로 한국환경산업기술원의 습지생태계 가치평가 및 탄소흡수 가치증진 기술개발사업의 지원을 받아 연구되었습니다.(2022003630003)