Paper Info
Title
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.
Abstract
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 molm-2s-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.
Year
DOI
Venue
2019
10.3390/rs11040434
REMOTE SENSING
Keywords
Field
DocType
optimal light spectrum,greenhouse illumination,light emitting diode,chlorophyll fluorescence,fluorescence gain,photosynthesis
Light quality,Photosynthesis,Ray,Spectral power distribution,Chlorophyll a,Remote sensing,Fluorescence,Optics,Chlorophyll fluorescence,Light-emitting diode,Geology
Journal
Volume
Issue
Citations 
11
4
0
PageRank 
References 
Authors
0.34
2
3
Name
Order
Citations
PageRank
Linnéa Ahlman100.34
Daniel Bånkestad200.34
Torsten Wik3197.55