Journal
SCIENTIA HORTICULTURAE
Volume 194, Issue -, Pages 267-277Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scienta.2015.08.021
Keywords
Brassica chinensis; Photosynthesis; Productivity; Narrowband illumination; Light-emitting diodes; Chloroplasts; Photochemical activity; Photophosphorylation; Chloroplast coupling factor; Oxidative damage; Light gradients
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We attempted to elucidate possible reasons of a decline in fresh and dry mass accumulation by Chinese cabbage (Brassica chinensis L.) plants under combined narrowband red and blue light emitting diodes (LEDs) in comparison with illumination by a broad-spectrum high-pressure sodium lamps (HPSL) of equal photosynthetically active radiation intensity. Analysis of photosynthetic activity, sugar content and composition, antioxidant activity, and membrane peroxidation revealed neither inhibition of nor damage to the photosynthetic apparatus. There was also no detectable oxidative stress and related photoassimilate loss, the source-sink relations were also unimpaired in LED-grown plants. Our findings suggest that the light distribution in the plant canopy might be an essential factor limiting plant growth under the LED light. The results are discussed in view of the role of the radiation in the yellow green range of the spectrum in driving photosynthesis. (C) 2015 Elsevier B.V. All rights reserved.
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