Supplemental But Not Photoperiodic Lighting Increased Seedling Quality and Reduced Production Time of Annual Bedding Plants

Hurt, Allison; López, Roberto G.; Craver, Joshua K.

doi:10.21273/hortsci13664-18

Cited by 8 publications

(6 citation statements)

References 27 publications

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“…Conversely, Lopez (2014, 2015) found that morphological responses to SL for bedding plant seedlings were observed when 40% to 60% of the DLI was provided by SL. Given this, Hurt et al (2019) hypothesized and confirmed that greater than 40% of the total DLI needs to come from SL to elicit morphological responses. They reported when LED SL provided 40% to 55% of the total DLI, compact growth of gerbera (Gerbera jamesonii) 'Jaguar Deep Orange', impatiens 'Accent Premium Salmon', and petunia 'Ramblin Peach Glo' seedlings were observed.…”

Section: Discussionmentioning

confidence: 88%

“…Presumably the increased fresh weight was due to higher leaf temperatures, resulting from infrared (IR) radiation emitted from HPS SL. When SL contributes <40% of the DLI (Hurt et al, 2019), morphological responses may be less pronounced than under sole-source lighting (SSL) (Hernandez and Kubota, 2015) and may be species dependent (Hernandez and Kubota, 2014).…”

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confidence: 99%

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Supplemental Radiation Quality Influences Cucumber, Tomato, and Pepper Transplant Growth and Development

Garcia¹,

López²

2020

horts

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Supplemental lighting is required for the production of high-quality vegetable transplants in greenhouses when the photosynthetic daily light integral (DLI) is low. Light-emitting diodes (LEDs) are a promising alternative to high-pressure sodium (HPS) lamps. However, there are a limited number of studies that have evaluated how LED supplemental lighting spectral quality beyond blue (B) and red (R) radiation influences plant growth and development. Seeds of hybrid greenhouse seedless cucumber ‘Elsie’ (Cucumis sativus), tomato ‘Climstar’ (Solanum lycopersicum), and pepper ‘Kathia’ (Capsicum annuum) were sown and placed into a dark growth chamber until radicle emergence. Seedlings were grown in a greenhouse at a 25 °C constant temperature set point and under five lighting treatments. The supplemental lighting treatments delivered a total photon flux density (TPFD) of 120 μmol·m−2·s−1 for 16 h·d−1 based on an instantaneous threshold from HPS lamps or LEDs [three treatments composed of B (400–500 nm), R (600–700 nm), white, and/or far-red (FR; 700–800 nm) LEDs], and a control that delivered 25 μmol·m−2·s−1 from HPS lamps (HPS25). The LED treatments defined by their wavebands (TPFD in μmol·m−2·s–1) of B, green (G, 500–600 nm), R, and FR radiation were B20G10R75FR15, B25R95, and B30G30R60; whereas the HPS treatments emitted B7G57R47FR9 (HPS120) and B1G13R9FR2 (HPS25). Generally, cucumber, pepper, and tomato transplants under B30G30R60 and HPS120 supplemental lighting had the greatest stem diameter. Fresh weight and leaf area of all three species was greater when G radiation replaced R or B radiation. For example, leaf area and fresh weight of cucumber, tomato, and pepper increased (by 33%, 22%, and 49%; and 35%, 14%, and 56%, respectively) for plants under B30G30R60 supplemental lighting compared with plants under B25R95 supplemental lighting. The most compact cucumber and pepper transplants were those grown under B25R95 supplemental lighting, and the most compact tomatoes were those grown under the HPS25 (control) and B25R95 supplemental lighting. Tomato transplants under treatments providing ≥30 μmol·m−2·s−1 of G radiation had an increased incidence of leaf necrosis. From this study, we conclude that plant responses to supplemental lighting quality are generally genera-specific, and therefore high-wire transplants should be separated by genera to optimize production and quality. However, additional studies are required to provide complete LED supplemental lighting recommendations.

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Section: Discussionmentioning

confidence: 88%

mentioning

confidence: 99%

Supplemental Radiation Quality Influences Cucumber, Tomato, and Pepper Transplant Growth and Development

Garcia¹,

López²

2020

horts

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“…High-quality vegetable seedlings are usually compact and fully rooted transplants with a higher seedling index ratio and root-to-shoot ratio [15]. Hurt et al [38] found that when DLI was increased to about 10 mol•m −2 •d −1 , the seedling quality index of five annual bedding plants was significantly improved. The root-to-shoot ratio of new guinea impatiens, geranium, and petunia cuttings were increased as DLI increased [11].…”

Section: Discussionmentioning

confidence: 99%

Effect of Daily Light Integral on Cucumber Plug Seedlings in Artificial Light Plant Factory

Cui

Song

et al. 2021

Horticulturae

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In a controlled environment, in an artificial light plant factory during early spring or midsummer, vegetable seedlings can be uniform, compact, and high quality. Appropriate light parameters can speed up the growth of seedlings and save on production costs. Two experiments were carried out in this study: (1) cucumber seedling growth under different daily light integrals (DLIs) (5.41–11.26 mol·m−2·d−1) and optimum DLI for seedling production were explored (experiment 1: Exp. 1); (2) under the same DLI selected by Exp. 1, the effects of different light intensities and photoperiods on cucumber seedlings were investigated (experiment 2: Exp. 2). The root biomass, root-to-shoot ratio, seedling index, and shoot dry matter rate increased as the DLI increased from 5.41 to 11.26 mol·m−2·d−1, while the shoot biomass and leaf area decreased in Exp. 1. The cucumber seedlings became more compact as DLI increased, but more flowers developed after transplanting when the DLI was 6.35 mol·m−2·d−1. Under the optimal DLI (6.35 mol·m−2·d−1), the optimal intensity was 110–125 μmol·m−2·s−1, and the optimal photoperiod was 14–16 h, in which plant biomass, shoot dry matter rate, seedling index, and photochemical efficiency were higher.

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“…The RB treatment was expected to produce a slightly greater plant dry mass than the BSW, since it had most of its light in the optimally photosynthetically efficient red range (McCree, 1971), but the slight difference that we observed was not statistically significant. A clear difference between the two spectra might have been observed at higher LED light intensities or greater durations of the extension treatments allowing the LED treatments to make up a larger proportion of the total daily light integral (Hurt et al, 2019), or under a longer experiment duration.…”

Section: Direct Effects Of Lightingmentioning

confidence: 99%

Supplemental LED lighting improves plant growth without affecting biological control in a tri-trophic greenhouse system

Fraser

Abram

Dorais³

2023

Preprint

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Artificial lighting, including light-emitting diode (LED) illumination, is increasingly being optimized in protected agricultural systems to maximize plant yield and quality. However, it may also cause other top-down and bottom-up effects in these relatively simple ecological communities that also include insect pests and their natural enemies. While some effects of LED lighting on insects have been demonstrated to date, it is not known how they influence biological control of insect pests in practice. To examine potential top-down and bottom-up impacts of LED illumination on greenhouse biological control with parasitoids, we studied the effects of artificially lengthened days on a tri-trophic system in cages and in a greenhouse. We grew plants under a 12-hour photoperiod of white-supplemented light with 6 hours of additional 1) white light or 2) red and blue light, or 3) with no additional light. We exposed the plants to the pest aphid Myzus persicae (Hemiptera : Aphididae) with or without its parasitoid wasp Aphidius matricariae (Hymenoptera : Braconidae), or to no insects. The 18-hour light treatments increased mean plant dry mass by 127% compared with the 12-hour control without affecting the aphid's population density or the parasitoid's biological control efficacy under relatively low light conditions. This suggests that insect communities in protected agriculture can be resilient to even drastic changes in their light environment, and that adjusting crop lighting in a manner that affects plant growth does not necessarily compromise biological control's effectiveness.

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Supplemental But Not Photoperiodic Lighting Increased Seedling Quality and Reduced Production Time of Annual Bedding Plants

Cited by 8 publications

References 27 publications

Supplemental Radiation Quality Influences Cucumber, Tomato, and Pepper Transplant Growth and Development

Supplemental Radiation Quality Influences Cucumber, Tomato, and Pepper Transplant Growth and Development

Effect of Daily Light Integral on Cucumber Plug Seedlings in Artificial Light Plant Factory

Supplemental LED lighting improves plant growth without affecting biological control in a tri-trophic greenhouse system

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