Effect of green light on nitrate reduction and edible quality of hydroponically grown lettuce (Lactuca sativa L.) under short-term continuous light from red and blue light-emitting diodes

文献类型： 外文期刊

第一作者： Bian, Zhonghua

作者： Bian, Zhonghua;Wang, Yu;Lu, Chungui;Cheng, Ruifeng;Yang, Qichang

作者机构：

关键词： Light spectra; Nitrogen metabolism enzymes; Gene expression; Nitrate; Continuous light; Lactuca sativa L.

期刊名称：ENVIRONMENTAL AND EXPERIMENTAL BOTANY （ 影响因子：5.545； 五年影响因子：5.99 ）

ISSN： 0098-8472

年卷期： 2018 年 153 卷

页码：

收录情况： SCI

摘要： Most leafy vegetables can accumulate large amounts of nitrate, which are often associated with harmful effects on human health. Nitrate assimilation in plants is determined by various growth conditions, especially light conditions including light intensity, light duration and light spectral composition. Red and blue light are the most important since both drive photosynthesis. Increasingly, recent evidence demonstrates a role for green light in the regulation of plant growth and development by regulating the expression of some specific genes. However, the effect of green light on nitrate assimilation has been underestimated. In this study, lettuce (Lactuca sativa L. cv. Butterhead) was treated with continuous light (CL) for 48 h by combined red and blue light-emitting diodes (LEDs) supplemented with or without green LED in an environment-controlled growth chamber. The results showed that nitrate reductase (NR) and nitrite reductase (NiR) related-gene expression and nitrate assimilation enzyme activities were affected by light spectral composition and light duration of CL. Adding green light to red and blue light promoted NR and MR expressions at 24 h, subsequently, it reduced expression of these genes during CL. Compared with red and blue LEDs, green light supplementation significantly increased NR, NiR, glutamate synthase (GOGAT) and glutamine synthetase (GS) activities. Green-light supplementation under red and blue light was more efficient in promoting nutritional values by maintaining high net photosynthetic rates (P-n) and maximal photochemical efficiency (F-v/F-m).

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