REDUCING NITRATE CONTENT IN LETTUCE BY PRE-HARVEST CONTINUOUS LIGHT DELIVERED BY RED AND BLUE LIGHT-EMITTING DIODES

文献类型: 外文期刊

第一作者: Zhou Wanlai

作者: Zhou Wanlai;Liu Wenke;Yang Qichang

作者机构:

关键词: continuous light;R;B ratio;nitrate;soluble sugar

期刊名称:JOURNAL OF PLANT NUTRITION ( 影响因子:1.707; 五年影响因子:1.645 )

ISSN: 0190-4167

年卷期: 2013 年 36 卷 3 期

页码:

收录情况: SCI

摘要: Effect of pre-harvest continuous light with different red/blue ratio on photon flux density (R/B ratio) on reducing nitrate accumulation was studied by growing lettuce (Lactuca sativa L.) under continuous illumination delivered by light-emitting diodes (LEDs). Results show that nitrate concentration decreased by 1648.02061.1 mg kg-1 in leaf blade and 962.92090.3 mg kg-1 in petiole, accompanied by a dramatic increase in soluble sugar content. Compared with monochromatic red light treatment, the decrease in nitrate concentration and increase in soluble sugar content in lettuce under mixed red and blue light were more pronounced. The lowest nitrate concentration was observed in the treatment with R/B ratio of 4. It's concluded that pre-harvest exposure to 48?h continuous LED light could effectively reduce nitrate accumulation in lettuce and this process is strongly affected by R/B ratio of light. This study may provide new perspective for pre-harvest quality management of vegetable, especially in commercial leaf vegetable production under artificial lighting.

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