Growth and nutritional properties of lettuce affected by mixed irradiation of white and supplemental light provided by light-emitting diode

文献类型： 外文期刊

第一作者： Chen, Xiao-li

作者： Chen, Xiao-li;Xue, Xu-zhang;Guo, Wen-zhong;Wang, Li-chun;Qiao, Xiao-jun;Guo, Wen-zhong;Wang, Li-chun

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关键词： LED light;Pigment;Soluble sugar;Ascorbic acid;Nitrate

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： 'Green Oak Leaf' lettuce were hydroponically cultured for 35 days under mixed light qualities of white light and a different supplemental light such as blue (B), green (G), yellow (Y), red (R), and far-red (Fr) provided by light-emitting diodes (LEDs). Effects of supplemental light qualities on the growth and nutritional properties of lettuce plants were investigated. The pure white LED (W) was used as control with a photosynthetic photon flux (PPF) value of approximately 135 mol m(-2) s(-1), and the basal white light in each treatment was 105 mol m(-2) s(-1) while the photon flux added by supplemental LED was approximately 30 mol m(-2) s(-1). The results indicated that supplemental lights led to obvious morphological changes, plants with WR appeared compact and vigorous while those with WY and WFr looked sparse and twisted, dwarfed plants with large leaves were detected under WB. Compared with those grown in the white light control, the fresh weight of shoots increased by 63.2% and 21.7% with supplemental R and B respectively, while decreased by 35.9% with supplemental Fr. Chlorophyll and carotenoid contents were significantly higher with supplemental R and B than other treatments. Supplemental B and G resulted in decrease of nitrate content. Supplemental G significantly promoted soluble sugar accumulation. Supplemental Fr increased S/R ratio and ascorbic acid accumulation but resulted in lower biomass and pigment contents. However, no positive impact of supplemental Y light was observed in the research. (C) 2016 Elsevier B.V. All rights reserved.

分类号： S6

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