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The effect of artificial solar spectrum on growth of cucumber and lettuce under controlled environment

Journal of Integrative Agriculture 2020年第8期19卷 2027-2034页

作者： ZOU Jie ZHOU Cheng-bo XU Hong CHENG Rui-feng YANG Qi-chang LI Tao Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing 100081P.R.China Sonneteck Technology Co. Ltd.Xiamen 361000P.R.China

Light-emitting diodes(leds)have been widely applied in the controlled environment agriculture,which are characterized by relatively narrow-band spectra and energetical *** recently,the spectrum of sunlike leds has been engineered and it closely resembles solar spectrum in the range of photosynthetic active radiation(PAR,400–700 nm).To investigate how plant growth responses to the spectrum of sunlike leds,cucumber and lettuce plants were cultivated and their responses were compared with the conventional white leds as well as composite of red and blue leds(RB,R/B ratio was 9:1).We observed that although sunlike leds resulted in a longer stem in cucumber,dry weight and leaf area were similar as those under RB leds,and significantly higher than those under white ***,cucumber leaves grown under sunlike and white leds showed higher photosynthetic capacity than those grown under RB *** lettuce,plants grown under sunlike leds showed larger leaf area and higher dry weight than the other two ***,the leaf photosynthetic capacity of lettuce grown under sunlike leds was the *** this context,the spectrum induced plant functions are ***,the three types of leds show distinct light spectra and they are different in many ***,it is difficult to attribute the different plant responses to certain specific light *** conclude that plants grown under sunlike leds exhibit larger leaf area,which may be due to some specific spectrum distributions(such as more far-red radiation),and consequently are favorable for light interception and therefore result in greater production.

关键词： cucumber leaf photosynthesis lettuce plant morphology sunlike leds

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