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Open AccessArticle

Relation between Changes in Photosynthetic Rate and Changes in Canopy Level Chlorophyll Fluorescence Generated by Light Excitation of Different Led Colours in Various Background Light

1
Department of Electrical Engineering, Chalmers University of Technology, SE-41293 Gothenburg, Sweden
2
Heliospectra AB, SE-41458 Gothenburg, Sweden
*
Author to whom correspondence should be addressed.
Remote Sens. 2019, 11(4), 434; https://doi.org/10.3390/rs11040434
Received: 19 January 2019 / Revised: 4 February 2019 / Accepted: 12 February 2019 / Published: 20 February 2019
Using light emitting diodes (LEDs) for greenhouse illumination enables the use of automatic control, since both light quality and quantity can be tuned. Potential candidate signals when using biological feedback for light optimisation are steady-state chlorophyll a fluorescence gains at 740 nm, defined as the difference in steady-state fluorescence at 740 nm divided by the difference in incident light quanta caused by (a small) excitation of different LED colours. In this study, experiments were conducted under various background light (quality and quantity) to evaluate if these fluorescence gains change relative to each other. The light regimes investigated were intensities in the range 160–1000 μ mol   m 2   s 1 , and a spectral distribution ranging from 50% to 100% red light. No significant changes in the mutual relation of the fluorescence gains for the investigated LED colours (400, 420, 450, 530, 630 and 660 nm), could be observed when the background light quality was changed. However, changes were noticed as function of light quantity. When passing the photosynthesis saturate intensity level, no further changes in the mutual fluorescence gains could be observed. View Full-Text
Keywords: optimal light spectrum; greenhouse illumination; light emitting diode; chlorophyll fluorescence; fluorescence gain; photosynthesis optimal light spectrum; greenhouse illumination; light emitting diode; chlorophyll fluorescence; fluorescence gain; photosynthesis
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MDPI and ACS Style

Ahlman, L.; Bånkestad, D.; Wik, T. Relation between Changes in Photosynthetic Rate and Changes in Canopy Level Chlorophyll Fluorescence Generated by Light Excitation of Different Led Colours in Various Background Light. Remote Sens. 2019, 11, 434. https://doi.org/10.3390/rs11040434

AMA Style

Ahlman L, Bånkestad D, Wik T. Relation between Changes in Photosynthetic Rate and Changes in Canopy Level Chlorophyll Fluorescence Generated by Light Excitation of Different Led Colours in Various Background Light. Remote Sensing. 2019; 11(4):434. https://doi.org/10.3390/rs11040434

Chicago/Turabian Style

Ahlman, Linnéa; Bånkestad, Daniel; Wik, Torsten. 2019. "Relation between Changes in Photosynthetic Rate and Changes in Canopy Level Chlorophyll Fluorescence Generated by Light Excitation of Different Led Colours in Various Background Light" Remote Sens. 11, no. 4: 434. https://doi.org/10.3390/rs11040434

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