Blue light associated with low phytochrome activity can promote elongation growth as shade-avoidance response: A comparison with red light in four bedding plant species

Kong, Yun; Stasiak, Michael; Dixon, Michael; Zheng, Youbin

doi:10.1016/j.envexpbot.2018.07.021

Cited by 80 publications

(92 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The promoted elongation by B vs. R light was considered as one of the shade-avoidance responses mediated by blue light associated with weak phytochrome activity under certain light levels in previous studies (Kong et al, 2018. This conclusion was also supported by the results in the present study.…”

Section: Discussionsupporting

confidence: 90%

“…This confirmed our second hypothesis that the elongation promoted by blue light is more obvious under 24-than 16-h lighting at least for some species. It appears that continuous lighting might provide a better platform to present and even amplify B vs. R light effects on plant elongation at least for some species (Kong et al, 2018). In practical production, for the same lighting (e.g., blue LED light), if at similar light intensity levels, longer photoperiod (e.g., 24 h vs. 16 h) means higher lighting cost, but using a lower light intensity for continuous (24-h) lighting is a way to balance it (Sysoeva et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…E-mail: yzheng@ uoguelph.ca. varied with different species (Kong et al, 2018. It was concluded that blue-lightpromoted elongation is a shade-avoidance response with varying sensitivity among species (Kong et al, 2018.…”

mentioning

confidence: 99%

“…varied with different species (Kong et al, 2018. It was concluded that blue-lightpromoted elongation is a shade-avoidance response with varying sensitivity among species (Kong et al, 2018. Unfortunately, the conclusion was drawn from the studies on some bedding plants and microgreens under 24-h lighting, although the shade-avoidance responses to blue light have been also reported for Arabidopsis under a photoperiod of <24 h (de Wit et al, 2016;Keller et al, 2011;Pedmale et al, 2016).…”

mentioning

confidence: 99%

“…Previous studies indicated that under LED lighting at a photosynthetic photon flux density (PPFD) of 100 mmol · m -2 · s -1 or 50 mmol · m -2 · s -1 , monochromatic blue vs. red light promoted elongation growth in all the tested bedding plant species, including petunia, calibrachoa, geranium, and marigold (Kong et al, 2018), and some microgreen species such as arugula, cabbage, and kale . In these studies, a photoperiod of 24 h was used for lighting treatments.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Blue versus Red Light Can Promote Elongation Growth Independent of Photoperiod: A Study in Four Brassica Microgreens Species

Kong¹,

Kamath²,

Zheng³

2019

horts

Self Cite

View full text Add to dashboard Cite

An elongated stem has beneficial effects on microgreen production. Previous studies indicate that under 24-hour light-emitting diode (LED) lighting, monochromatic blue light, compared with red light, can promote plant elongation for some species. The objective of this study was to investigate whether shortened photoperiod can change blue vs. red light effects on elongation growth. The growth and morphology traits of arugula (Brassica eruca, ‘Rocket’), cabbage (Brassica oleracea, unknown variety name), mustard (Brassica juncea, ‘Ruby Streaks’), and kale (Brassica napus, ‘Red Russian’) seedlings were compared during the stage from seeding to cotyledon unfolding under two light quality × two photoperiod treatments: 1) R, monochromatic red light (665 nm) and 2) B, monochromatic blue light (440 nm) using continuous (24-hour light/0-hour dark) or periodic (16-hour light/8-hour dark) LED lighting. A photosynthetic photon flux density of ≈100 μmol·m−2·s−1 and an air temperature of ≈22 °C was used for the preceding treatments. After 7 to 8 days of lighting treatment, regardless of photoperiod, B promoted elongation growth compared with R, as demonstrated by a greater stem extension rate, hypocotyl length, or petiole length in the tested microgreen species, except for mustard. The promotion effects on elongation were greater under 24- vs. 16-hour lighting in many cases. Among the tested species, mustard showed the lowest sensitivity in elongation response to B vs. R, which was independent of photoperiod. This suggests that the blue-light-promoted elongation is not specifically from 24-hour lighting, despite the varying promotion degree under different photoperiods or for different species. The elongation growth promoted by blue LED light under a photoperiod of either 24 hours or 16 hours can potentially benefit indoor production of microgreens.

show abstract

Section: Discussionsupporting

confidence: 90%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Blue versus Red Light Can Promote Elongation Growth Independent of Photoperiod: A Study in Four Brassica Microgreens Species

Kong¹,

Kamath²,

Zheng³

2019

horts

Self Cite

View full text Add to dashboard Cite

show abstract

Beyond the PAR spectra: impact of light quality on the germination, flowering, and metabolite content of Stevia rebaudiana (Bertoni)

et al. 2021

View full text Add to dashboard Cite

BACKGROUND: Stevia rebaudiana is a high value crop due to the strong commercial demand for its metabolites (steviol glycosides) but has limited geographical cultivation range. In non-native environments with different daylength and light quality, Stevia has low germination rates and early flowering resulting in lower biomass and poor yield of the desired metabolites. In this study, artificial lighting with light-emitting diodes (LEDs) was used to determine if different light quality within and outside of the photosynthetically active radiation (PAR) range can be used to improve germination rates and yields for production of steviol glycosides for the herbal supplement and food industry.RESULTS: Plants treated with red and blue light at an intensity of 130 ∼mol m −2 s −1 supplemented with 5% of UV-A light under a 16-h photoperiod produced the most desirable overall results with a high rate of germination, low percentage of early flowering, and high yields of dry leaf, stevioside and rebaudioside A, 175 days after planting. CONCLUSION: While red and blue light combinations are effective for plant growth, the use of supplemental non-PAR irradiation of UV-A wavelength significantly and desirably delayed flowering, enhanced germination, biomass, rebaudioside A and stevioside yields, while supplemental green light improved yield of biomass and rebaudioside A, but not stevioside. Overall, the combination of red, blue and UV-A light resulted in the best overall productivity for Stevia rebaudiana.

show abstract

Soybean Plant Growth and Tre6P Metabolism Under Red/Far-Red and Blue Light

He,

Chai,

Zhao

et al. 2023

J Plant Growth Regul

View full text Add to dashboard Cite

Blue light associated with low phytochrome activity can promote elongation growth as shade-avoidance response: A comparison with red light in four bedding plant species

Cited by 80 publications

References 67 publications

Blue versus Red Light Can Promote Elongation Growth Independent of Photoperiod: A Study in Four Brassica Microgreens Species

Blue versus Red Light Can Promote Elongation Growth Independent of Photoperiod: A Study in Four Brassica Microgreens Species

Beyond the PAR spectra: impact of light quality on the germination, flowering, and metabolite content of Stevia rebaudiana (Bertoni)

Soybean Plant Growth and Tre6P Metabolism Under Red/Far-Red and Blue Light

Contact Info

Product

Resources

About