数字农科院2.0

Continuous Light from Red, Blue, and Green Light-emitting Diodes Reduces Nitrate Content and Enhances Phytochemical Concentrations and Antioxidant Capacity in Lettuce

文献类型： 外文期刊

作者： Bian, Zhong-Hua;Cheng, Rui-Feng;Yang, Qi-Chang;Wang, Jun;Lu, Chungui

作者机构：

关键词： Lactuca sativa;nitrate reductase activity;free-radical scavenging activity;phenolic compounds;photosynthetic capacity

期刊名称： JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Light-emitting diodes (LEDs) have shown great potential for plant growth and development, with higher luminous efficiency and more flexible and feasible spectral control compared with other artificial lighting. The combined effects of red and blue (RB) LED with or without green (G) LED light and white LED light on lettuce (Lactuca sativa L.) growth and physiology, including nitrate content, chlorophyll fluorescence, and phytochemical concentration before harvest, were investigated. Continuous light exposure at preharvest can effectively reduce nitrate accumulation and increase phytochemical concentrations in lettuce plants. Nitrate accumulation is dependent on the spectral composition and duration of treatment: lettuce exposed to continuous RB (with or without G) LED light with a photosynthetic photon flux (PPF) of 200 mu mol.m(-2).s(-1) exhibited a remarkable decrease in nitrate content at 24 hour compared with white LED light treatment at the same PPF. In addition, RB LED light (R:B = 4:1) was more effective than white LED light at the same PPF in facilitating lettuce growth. Moreover, continuous LED light for 24 hours significantly enhanced free-radical scavenging activity and increased phenolic compound concentrations. We suggest that 24 hours continuous RB LED with G light exposure can be used to decrease nitrate content and enhance lettuce quality.

分类号： S6

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