文献类型： 外文期刊

作者： Chen, Xiao-li ¹ ; Yang, Qi-chang ² ; Song, Wen-pin ¹ ; Wang, Li-chun ¹ ; Guo, Wen-zhong ¹ ; Xue, Xu-zhang ¹ ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Res Ctr Informat Technol Agr, Beijing 100097, Peoples R China

2.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China

关键词： Red light;Blue light;LED;Alternating irradiation;Plant factory;Photoreceptor

期刊名称：SCIENTIA HORTICULTURAE （ 影响因子：3.463； 五年影响因子：3.672 ）

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收录情况： SCI

摘要： In this study, effects of alternating red light (R) and blue light (B) provided by LEDs on the growth and nutritional properties of 'Green Oak leaf lettuce were examined. Four alternating light treatments (R/B) had the same 8.64 mu mol m(-2) daily light integral (DLI) and similar R:B ratio (2:1), but different R/B alternating intervals that were respectively 8 h, 4 h, 2 h, and 1 h during a 16 h photoperiod. Two simultaneous light treatments, one of which (RB) had the same DLI and energy consumption with the alternating light treatments, while the other (RB') had the same photoperiod with the alternating light treatments were set up to compare the concurrently and alternately provided R and B. Results showed that different types of radiation led to obvious morphological changes, plants with simultaneous RB appeared the most sparse while those with RB' looked the most compact. Plant height/width and leaf length/width were all the highest under R/B (8 h) followed by R/B (1 h). Lettuce biomass under RB' was significantly higher than others, more than twice that under RB, R/B (4 h) and R/B (2 h), but less than twice that under R/B (8 h) and R/B (1 h). RB' significantly decreased the soluble sugar content by 9%-32% while increased crude fiber content by 14%-39% compared with others. Significantly higher ascorbic acid content as well as lower nitrate content were detected in lettuce under R/B (4 h) and R/B (2 h), while significantly lower ascorbic acid content as well as higher nitrate content were detected in lettuce under R/B (8 h) and R/B (1 h). In all, based on the same energy consumption, R/B (8 h) and R/B (1 h) resulted in higher yield, while R/B (4 h) and R/B (2 h) brought about higher nutritive value compared with the cocurrent light RB. Therefore, we conclude that lettuce growth and qualities can be purposely adjusted by adopting different alternating intervals of red and blue light. Meanwhile, the alternating modes will provide methods for deeply studying the relationship of red and blue light when acting on plants.