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

Bian, Z., Cheng, R., Wang, Y., Yang, Q. and Lu, C. ORCID: 0000-0002-0064-4725, 2018. 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. Environmental and Experimental Botany. ISSN 0098-8472

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Abstract

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 48h 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 NiR expressions at 24h, 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 (Pn) and maximal photochemical efficiency (Fv/Fm).

Item Type: Journal article
Publication Title: Environmental and Experimental Botany
Creators: Bian, Z., Cheng, R., Wang, Y., Yang, Q. and Lu, C.
Publisher: Elsevier
Date: 15 May 2018
ISSN: 0098-8472
Identifiers:
NumberType
10.1016/j.envexpbot.2018.05.010DOI
S0098847218305914Publisher Item Identifier
Rights: © 2018 Elsevier B.V. All rights reserved.
Divisions: Schools > School of Animal, Rural and Environmental Sciences
Depositing User: Linda Sullivan
Date Added: 16 May 2018 10:56
Last Modified: 16 May 2018 11:33
URI: http://irep.ntu.ac.uk/id/eprint/33598

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