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

文献类型： 外文期刊

第一作者： Zou Jie

作者： Zou Jie;Zhou Cheng-bo;Cheng Rui-feng;Yang Qi-chang;Li Tao;Xu Hong

作者机构：

关键词： cucumber; leaf photosynthesis; lettuce; plant morphology; Sunlike LEDs

期刊名称：JOURNAL OF INTEGRATIVE AGRICULTURE （ 影响因子：2.848； 五年影响因子：2.979 ）

ISSN： 2095-3119

年卷期： 2020 年 19 卷 8 期

页码：

收录情况： SCI

摘要： Light -emitting diodes (LEDs) have been widely applied in the controlled environment agriculture, which are characterized by relatively narrow -band spectra and energetical efficiency. Most 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 LEDs. Moreover, cucumber leaves grown under Sunlike and white LEDs showed higher photosynthetic capacity than those grown under RB LEDs. For lettuce, plants grown under Sunlike LEDs showed larger leaf area and higher dry weight than the other two treatments. However, the leaf photosynthetic capacity of lettuce grown under Sunlike LEDs was the lowest. In this context, the spectrum induced plant functions are species -dependent. Furthermore, the three types of LEDs show distinct light spectra and they are different in many aspects. Therefore, it is difficult to attribute the different plant responses to certain specific light spectra. We 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.

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