Spectral Effects of Three Types of White Light-emitting Diodes on Plant Growth and Development: Absolute versus Relative Amounts of Blue Light
By Kevin R. Cope, B. Bugbee. 2013
215 citations recorded by the source corpus.
Light-emitting diodes (LEDs) are a rapidly developing technology for plant growthlighting andhavebecome apowerful toolfor understandingthe spectraleffects of light on plants. Several studies have shown that some blue light is necessary for normal growth and development, but the effects of blue light appear to be species-dependent and may interact with other wavelengths of light as well as photosynthetic photon flux (PPF). We report the photobiological effects of three types of white LEDs (warm, neutral, and cool, with 11%, 19%, and 28% blue light, respectively) on the growth and development of radish,soybean,andwheat.AllspeciesweregrownattwoPPFs(200and500 mmol·m L2 ·s L1 ) under each LED type, which facilitated testing the effect of absolute (mmol photons per m L2 ·s L1 ) and relative (percent of total PPF) blue light on plant development. Root and shoot environmental conditions other than light quality were uniformly maintained among six chambers (three lamp types 3 two PPFs). All LEDs had similar phytochrome photoequilibria and red:far red ratios. Blue light did not affect total dry weight (DW) in any species but significantly altered plant development. Overall, the low blue light from warm white LEDs increased stem elongation and leaf expansion, whereas the high blue light from cool white LEDs resulted in more compact plants. For radish and soybean, absolute blue light was a better predictor of stem elongation than relative blue light, but relative blue light better predicted leaf area. Absolute blue light better predicted the percent leaf DW in radish and soybean and percent tiller DW in wheat. The largest percentage differences among light sources occurred in low light (200 mmol·m L2 ·s L1 ). These results confirm and extend the results of otherstudies indicating that light quantity and quality interact to determine plant morphology. The optimal amount of blue light likely changes with plant age because plant communities balance the need for rapid leaf expansion, which is necessary to maximize radiation capture, with prevention of excessive stem elongation. A thorough understanding of this interaction is essential to the development of light sources for optimal plant growth and development.
Subfields: Plant Science
View Paper: https://www.semanticscholar.org/paper/336e25ff6f61ba5b2274625fa569c51b35bae1e9
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Citations in the corpus
- Effect of Differential Light Quality on Morphology, Photosynthesis, and Antioxidant Enzyme Activity in Camptotheca acuminata Seedlings (2017, background): “Keywords Camptotheca acuminata Light quality Photosynthetic characteristics Chlorophyll Antioxidant system Chloroplast ultrastructure”
- Growth, Photosynthetic Characteristics, Antioxidant Capacity and Biomass Yield and Quality of Wheat (Triticum aestivum L.) Exposed to LED Light Sources with Different Spectra Combinations (2014, background): “Wheat is one of the core grain crops in BLSS. Previous study has shown that although wheat is not sensitive to the blue light dose induction (Dougher and Bugbee 2001, Cope and Bugbee 2013), the combination of red–blue LED spectra can improve its output and photosynthetic rate (Goins et al. 1997).”