Changes in Spectral Reflectance, Photosynthetic Performance, Chlorophyll Fluorescence, and Growth of Mini Green Romaine Lettuce According to Various Light Qualities in Indoor Cultivation

Light quality can be stated to be the identity of an artificial light source, and although the response of light quality may vary depending on the crop, the effect is clearly visible and can produce various results depending on the combination of an artificial light source. This study investigated t...

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Bibliographic Details
Published in:Horticulturae 2024-08, Vol.10 (8), p.860
Main Authors: Lee, Joo Hwan, Kwon, Yong Beom, Choi, In-Lee, Yoon, Hyuk Sung, Kim, Jidong, Kim, Yongduk, Kang, Ho-Min
Format: Article
Language:English
Subjects:
Chlorophyll
Crops
Efficiency
Energy
Fluorescence
Growth
Leaf area
Lee, J.H
Lettuce
Light emitting diodes
Light quality
Light sources
Lighting
OJIP
Parameters
Photomorphogenesis
Photosynthesis
photosynthetic rate
PIABS
Plant growth
Principal components analysis
Quantum dots
Reflectance
Respiration
Spectral reflectance
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Summary:Light quality can be stated to be the identity of an artificial light source, and although the response of light quality may vary depending on the crop, the effect is clearly visible and can produce various results depending on the combination of an artificial light source. This study investigated the spectral reflectance, photosynthetic performance, and chlorophyll fluorescence of mini green romaine lettuce based on light quality. Most parameters related to spectral reflectance showed the best results under blue light, and photosynthetic performance was more effective with mixed light than with single-colored light, among which blue + red (BR)-LED was the most suitable. Red light was ineffective, showing mostly low results in parameters of spectral reflectance and photosynthetic performance. In the case of chlorophyll fluorescence, the light quality influenced photomorphogenesis, resulting in increased leaf length and width with R- and quantum dot (QD)-LED, which expanded the leaf area and allowed for more external light to be captured (ABS/RC and TRo/RC). However, the ratio of electronized energy (ETo/RC) was low, and the amount of energy dissipated as heat (DIo/RC) was high. Consequently, the degree of electron acceptor reduction and overall photosynthetic performance (PI[sub.ABS] and PI[sub.total]) were lower compared to other light qualities. Additionally, the contrasting results of QD-LED and BR-LED were attributed to the form of red light and the presence or absence of far-red light when comparing spectra. Principal component analysis also clearly distinguished light qualities for photosynthesis and growth. Growth was increased by red (R)- and QD-LED, while photosynthetic performance was increased by BR- and blue (B)-LED.
ISSN:2311-7524
2311-7524
DOI:10.3390/horticulturae10080860