文献类型： 外文期刊
第一作者： Chen, Yanqi
作者： Chen, Yanqi;Liu, Jiayuan;Liu, Wenke;Chen, Yanqi;Liu, Jiayuan;Liu, Wenke;Liu, Wenke
作者机构：
关键词： Amino acid metabolism; nitrogen metabolism; PFAL; quality; ryegrass
期刊名称：JOURNAL OF PLANT NUTRITION （ 影响因子：2.1； 五年影响因子：2.4 ）
ISSN： 0190-4167
年卷期： 2023 年
页码：
收录情况： SCI
摘要： Light intensity plays a critical regulatory role in determining plant yield and quality, and energy consumption in plant factory with artificial light (PFAL). The effects of different light intensities (200, 300, 400, 500, and 600 mu mol center dot m-2 center dot s-1) of light-emitting diodes (LED) red and blue light with ratio 4:1 on growth, quality, nitrogen and amino acid metabolisms of ryegrass were investigated. The results showed the tiller number and shoot fresh weight in ryegrass were increased, while plant height and stem diameter remained stable with the improvement of light intensity. The highest levels of soluble protein, free amino acid, and DPPH free radical clearance rate in photon flux density (PPFD) at 500 mu mol center dot m-2 center dot s-1, and then significantly decreased with light intensity increased. The highest soluble sugar content was found at PPFD of 600 mu mol center dot m-2 center dot s-1, while malondialdehyde (MDA) content remained stable in all treatments. As the light intensity increased, nitrate content decreased, while nitrate reductase (NR) activity and the ammonium content increased. As light intensity was increased from 200 to 600 mu mol center dot m-2 center dot s-1, nitrite reductase (NiR) activity first decreased and then increased. Moreover, glutamate and cysteine contents increased first and then decreased, while glutamate synthase (GOGAT), glutamine synthase (GS), glutamate dehydrogenase (GDH), and cysteine synthases (CS) activities increased continuously with light intensity. Light intensity was significantly correlated with the parameters of growth, quality, nitrogen and amino acid metabolisms in ryegrass. It was recommended that PPFD at 400-500 mu mol center dot m-2 center dot s-1, photoperiod of 16 h/d was suitable for ryegrass high-efficient production in PFAL with relatively low energy cost.
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