Study on the photosynthetic characteristics of Eutrema japonica (Siebold) Koidz. under the pulsed LEDs for simulated sunflecks

Journal of Ecology and Environment

Young Han You¹  Eui Joo Kim¹  Jae Hoon Park¹  Kyu Tae Cho¹  Jung Min Lee¹  Seung Yeon Lee¹  Eung Pill Lee²  Jin Hee Park³  Sang Bum Kim⁴  Heon Mo Jeong⁵  Seung Se Choi⁶  Hoey Kyung Park⁷ 

[1] Department of Biological Science, Kongju National University, 32588, Gongju, Republic of Korea;Invasive Alien Species Research Team, National Institute of Ecology, 33657, Seocheon, Republic of Korea;Plant Research Team, Nakdonggang National Institute of Biological Resources, 37242, Sangju, Republic of Korea;Soldan Inc., 05854, Seoul, Korea;Team of Climate Change Research, National Institute of Ecology, 33657, Seocheon, Republic of Korea;Team of National Ecosystem Survey, National Institute of Ecology, 33657, Seocheon, Republic of Korea;UniconKorea, Techno 8-ro, Yuseong-gu, Daejon, Republic of Korea;

关键词: Duty ratio;    Eutrema japonica;    Light frequency;    LED pulsed light;    Plant factory;    Sunfleck;   

DOI  :  10.1186/s41610-021-00181-2

来源: Springer

【 摘 要 】

BackgroundThe sunfleck is an important light environmental factor for plants that live under the shade of trees. Currently, the smartfarm has a system that can artificially create these sunfleks. Therefore, it was intended to find optimal light conditions by measuring and analyzing photosynthetic responses of Eutrema japonica (Miq.) Koidz., a plant living in shade with high economic value under artificial sunflecks.ResultsFor this purpose, we used LED pulsed light as the simulated sunflecks and set the light frequency levels of six chambers to 20 Hz, 60 Hz, 180 Hz, 540 Hz, 1620 Hz, and 4860 Hz of a pulsed LED grow system in a plant factory and the duty ratio of the all chambers was set to 30%, 50%, and 70% every 2 weeks. We measured the photosynthetic rate, transpiration rate, stomatal conductance, and substomatal CO2 partial pressure of E. japonica under each light condition. We also calculated the results of measurement, A/Ci, and water use efficiency. According to our results, the photosynthetic rate was not different among different duty ratios, the transpiration rate was higher at the duty ratio of 70% than 30% and 50%, and stomatal conductance was higher at 50% and 70% than at 30%. In addition, the substomatal CO2 partial pressure was higher at the duty ratio of 50% than 30% and 70%, and A/Ci was higher at 30% than 50% and 70%. Water use efficiency was higher at 30% and 50% than at 70%. While the transpiration rate and stomatal conductance generally tended to become higher as the frequency level decreased, other physiological items did not change with different frequency levels.ConclusionsOur results showed that 30% and 50% duty ratios could be better in the cultivation of E. japonica due to suffering from water stress as well as light stress in environments with the 70% duty ratio by decreasing water use efficiency. These results suggest that E. japonica is adapted under the light environment with nature sunflecks around 30–50% duty ratio and low light frequency around 20 Hz.

【 授权许可】

CC BY