Continuous light-emitting Diode (LED) lighting for improving food quality

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Lu, C ORCID: https://orcid.org/0000-0002-0064-4725 and Bian, Z ORCID: https://orcid.org/0000-0002-8312-840X, 2016. Continuous light-emitting Diode (LED) lighting for improving food quality. In: 2016 Beijing Conference on Food Nutrition and Human Health, Beijing, China, 17-20 October 2016.

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Abstract

Lighting-emitting diodes (LEDs) have shown great potential for plant growth and development, with higher luminous efficiency and positive impact compared with other artificial lighting. The combined effects of red/blue or/and green, and white LED light on plant growth and physiology, including chlorophyll fluorescence, nitrate content and phytochemical concentration before harvest, were investigated. The results showed that continuous light (CL)
exposure at pre-harvest can effectively reduce nitrate
accumulation and increase phytochemical concentrations in lettuce plants, and the former is dependent on the spectral composition and continuous light duration. Lettuce plants grown under continuous combined red and blue (with or without green) LED light with a photosynthetic photon flux density (PPFD) at 200 μ mol m-2-s-1 exhibited a remarkable decrease of nitrate contents at 24 h compared to other light treatments. In addition, red and blue light (R:B=4:1) was more effective in facilitating lettuce growth than white
LED light at the same PPFD. Moreover, continuous LED light
for 24 h significantly enhanced the free-radical scavenging activity and increased phenolic compound concentrations. In this study, we suggest that a period of continuous LED (R/B)
with green (G) light exposure is needed in order to decrease nitrate concentrations and enhance lettuce quality. 24 h
appears to be the best, but this period should not exceed 48 h. It appears that continuous light could enhance the activity of nitrate reductase leading to a low level of
nitrate content in the leaf. However, the reduction of nitrate is considered to be associated with the circadian clock and the light-signaling pathway as well.

Item Type:	Conference contribution
Creators:	Lu, C. and Bian, Z.
Date:	October 2016
Divisions:	Schools > School of Animal, Rural and Environmental Sciences
Record created by:	Linda Sullivan
Date Added:	05 May 2017 14:33
Last Modified:	20 Aug 2020 14:26
URI:	https://irep.ntu.ac.uk/id/eprint/30584