Does “blue” light invariably cause plant compactness? Not really: a comparison with red light in four bedding plant species during the transplant stage

Kong, Yuyao; Schiestel, Katherine; Zheng, Yuanyuan

doi:10.17660/actahortic.2020.1296.79

Cited by 3 publications

(10 citation statements)

References 22 publications

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“…In contrast, the plant elongation promoted by blue light from LED lighting was found to be related to a low phytochrome activity, 2 of 14 which may reduce cryptochrome activity and increase phytotropin activity, due to a crosstalk between different light receptors [15,[19][20][21][22]. The promoted plant elongation under blue vs. red light has been confirmed by a series of studies using LED lights at different photoperiods, light intensities, and peak wavelengths, although the response sensitivity varies with light environments, plant species, and growth stages [14,[23][24][25][26]. However, whether the response sensitivity can be affected by temperature is still unknown and needs to be studied.…”

Section: Introductionmentioning

confidence: 94%

Effect of Temperature Variation and Blue and Red LEDs on the Elongation of Arugula and Mustard Microgreens

Kong¹,

Masabni²,

Niu³

2023

Horticulturae

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Recent studies using LED lighting at low to modest intensity have indicated that compared with red light, blue light can promote plant elongation in many crops as a shade avoidance response despite varying sensitivity with light environments, plant species, and growth stages. Currently, there is limited understanding of how temperature affects the blue light-mediated plant response. To clarify this point, two microgreen species (arugula and mustard) were grown indoors under two light quality × two temperature treatments: red LED light (peak at 670 nm) and blue LED light (peak at 450 nm) at 18 °C or 28 °C. A photosynthetic photon flux density of 110 µmol m−2 s−1 and a photoperiod of 12 h d−1 were used for all treatments. After 6 to 8 days of treatment, at both temperatures, blue vs. red light promoted plant elongation, as demonstrated by a greater plant elongation rate, final plant height, and hypocotyl length, in arugula but not in mustard. Blue vs. red light also promoted some shade-avoidance responses such as decreased cotyledon size in both species and increased petiole length and dry mass partitioning to hypocotyls in arugula only. The elongation promotion in arugula by blue light was greater at 18 °C than at 28 °C, showing interactions between light and temperature on most plant traits. For mustard, plant elongation was promoted at 28 °C compared to 18 °C independent of light treatment, showing no interactions between light and temperature on most plant traits. These results suggest that the blue light-mediated elongation as a shade-avoidance response is not reversed by high temperature, despite the varying sensitivity with temperatures and species.

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Section: Introductionmentioning

confidence: 94%

Effect of Temperature Variation and Blue and Red LEDs on the Elongation of Arugula and Mustard Microgreens

Kong¹,

Masabni²,

Niu³

2023

Horticulturae

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“…We found that there are reported discrepancies in the morphological responses to blue vs. red LED light for plants under conditions other than an in vitro environment. Specifically, blue LED light was found to promote stem or leaf elongation in eggplants [ 23 , 24 ], cherry tomatoes [ 25 ], cucumber [ 26 , 27 ], watermelon [ 28 ], sesame [ 29 ], arugula [ 30 , 31 , 32 , 33 , 34 , 35 , 36 ], kale [ 30 , 32 , 33 , 34 ], cabbage [ 30 , 32 , 33 , 34 , 37 ], sunflowers [ 16 , 38 ], peas [ 39 ], calibrachoa [ 19 , 40 , 41 , 42 , 43 ], petunias [ 17 , 21 , 22 , 40 , 41 , 42 , 43 , 44 ], marigolds [ 18 , 40 , 42 , 43 ], geraniums [ 40 , 42 , 43 ], tulips [ 45 ], and wild Arabidopsis [ 46 , 47 , 48 ], compared to ...…”

Section: A Scientific Consensus Has Been Revised By Discoveries From ...mentioning

confidence: 99%

“…An alternative approach involves adding gradually increasing amounts of FR light (i.e., gradually decreasing R/FR ratios) to BR, from 0 to 6%. In further experiments with bedding plants and microgreens, four impure BL treatments were established in addition to R and B [ 33 , 41 , 42 ]. These four impure BL treatments, denoted as BRF0, BRF2, BRF4, and BRF6, were created by blending B with a low-level (6%) R and further adding 0, 2, 4, and 6 µmol m −2 s −1 of FR light, respectively.…”

Section: The Purity Of Blue Light May Affect Plants’ Elongation Respo...mentioning

confidence: 99%

“…However, B did not show a greater promotional effect on plant elongation than BRF6, despite a lower PPS value (0.49 vs. 0.60). It appears that the plant elongation promoted by BL gradually became saturated once the PPS values decreased below 0.60 [ 33 , 41 , 42 ]. It is possible that the deactivated phytochrome contributes to the maximum elongation promotion by BL [ 33 ].…”

Section: The Purity Of Blue Light May Affect Plants’ Elongation Respo...mentioning

confidence: 99%

“…It has been found that BL-mediated elongation can vary between plant species and even cultivars [ 4 , 24 ]. In our initial experiments, only four ornamental species (petunias, calibrachoa, geraniums, and marigolds) were evaluated [ 40 , 41 , 42 , 43 ]. However, subsequent experiments expanded the scope to microgreens such as arugula, mustard, cabbage, and kale [ 30 , 31 , 32 , 33 , 34 , 35 ], and other microgreens/baby greens such as sunflower, cilantro, celtuce, basil, and pak choi (unpublished data; Figure 2 ), as well as the model plant Arabidopsis [ 46 , 47 , 48 ].…”

Section: Factors Affecting Plants’ Elongation Response To Pure Blue L...mentioning

confidence: 99%

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Magic Blue Light: A Versatile Mediator of Plant Elongation

Kong,

Zheng

2023

Plants

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Blue light plays an important role in regulating plant elongation. However, due to the limitations of older lighting technologies, the responses of plants to pure blue light have not been fully studied, and some of our understandings of the functions of blue light in the literature need to be revisited. This review consolidates and analyzes the diverse findings from previous studies on blue-light-mediated plant elongation. By synthesizing the contrasting results, we uncover the underlying mechanisms and explanations proposed in recent research. Moreover, we delve into the exploration of blue light-emitting diodes (LEDs) as a tool for manipulating plant elongation in controlled-environment plant production, highlighting the latest advancements in this area. Finally, we acknowledge the challenges faced and outline future directions for research in this promising field. This review provides valuable insights into the pivotal role of blue light in plant growth and offers a foundation for further investigations to optimize plant elongation using blue light technology.

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An Approach for Designing Mixed Light-Emitting Diodes to Match Greenhouse Plant Absorption Spectra

et al. 2021

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We report a methodological approach for simulating luminary output radiation, which is achieved by mixing light-emitting diodes (LEDs) in order to match any plant absorption spectrum. Various recorded narrow-band LED spectra of different colors were first characterized and then fitted with a multi-Gaussian model. An optimizing procedure computed the optimal weighting of the relevant parameters so as to minimize the discrepancy between the combined spectrum and the reference target curve. The particle swarm optimization (PSO) method was applied because it is the most suitable technique for mono-objective situations. Within the useful spectral interval, the worst relative standard deviation between the optimized curve and recorded LED spectral power distribution (SPD) was 3.4%. When combining different LED types, the simulated light output showed that we could limit ourselves to selecting only five colored sources. This work will help us to design an optimized 200W laboratory luminaire with a pulse-width switched-mode power supply.

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Does “blue” light invariably cause plant compactness? Not really: a comparison with red light in four bedding plant species during the transplant stage

Cited by 3 publications

References 22 publications

Effect of Temperature Variation and Blue and Red LEDs on the Elongation of Arugula and Mustard Microgreens

Effect of Temperature Variation and Blue and Red LEDs on the Elongation of Arugula and Mustard Microgreens

Magic Blue Light: A Versatile Mediator of Plant Elongation

An Approach for Designing Mixed Light-Emitting Diodes to Match Greenhouse Plant Absorption Spectra

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