Effects of Selective Screening of the Daylight Spectrum, and of Twilight on Plant Growth in Greenhouses

Mortensen, Leiv M.; Moe, Rud

doi:10.17660/actahortic.1992.305.14

Cited by 6 publications

(4 citation statements)

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“…The duration of the treatment (30 min) was comparable to the duration of an average twilight, whereas the daily light integral and the duration of the photoperiod was comparable to a winter day in the Northern hemisphere. The EOD twilight causing increased elongation contradicts earlier findings with chrysanthemums by Mortensen and Moe (1992). Mortensen and Moe (1992) did not show a significant effect from EOD elimination of twilight using black-out curtains on plant height.…”

Section: Discussioncontrasting

confidence: 78%

“…The EOD twilight causing increased elongation contradicts earlier findings with chrysanthemums by Mortensen and Moe (1992). Mortensen and Moe (1992) did not show a significant effect from EOD elimination of twilight using black-out curtains on plant height. Experiments with chrysanthemum were performed during summer in Norway.…”

Section: Discussioncontrasting

confidence: 78%

“…A similar experiment in Norway (lat. 60°N) with chrysanthemum and tomato had no or only a small effect on plant height (Mortensen and Moe, 1992). The latter experiment was done during summer with photoperiods varying between 12 and 18.5 h. Knowledge from experiments with EOD-FR is useful in understanding the effect of twilight, and EOD-FR response has been suggested to be the most effective in increasing the stem elongation rate during short photoperiods (Downs et al, 1957;Vince-Prue, 1977).…”

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confidence: 99%

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End-of-day Lighting with Different Red/Far-red Ratios Using Light-emitting Diodes Affects Plant Growth of Chrysanthemum × morifolium Ramat. ‘Coral Charm’

Lund¹,

Blom²,

Aaslyng³

2007

horts

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Controlling plant height without the use of plant growth retardants is one of the goals in future production of potted plants. Light quality with a low red to far-red ratio (R:FR) increases plant height. In this trial, the effects of light quality [R:FR ratio of 0.4, 0.7, and 2.4 (R = 600–700 nm, FR = 700–800 nm)] at the end of day were investigated on potted chrysanthemums using growth chambers. After a 9-h photoperiod, the 30-min end-of-day lighting was provided by light-emitting diodes at low irradiance by maintaining either red = 1 μmol·m−2·s−1 (Rcon) or far-red = 1 μmol·m−2·s−1(FRcon). After 3 weeks of end-of-day lighting, plants given the lowest end-of-day ratios (R:FR of 0.4 or 0.7) were taller than control plants (R:FR = 2.4). For low ratios of R:FR (0.4), the actual intensities of R and FR did not affect plant height, whereas for higher ratios of R:FR (0.7 and 2.4), plant height was greater for FRcon than for Rcon. Leaf area of the lateral side shoots was lower for plants treated with an R:FR of 0.4 compared with those of controls. Dry weight, stem diameter, number of internodes, and number of lateral branches were unaffected by the end-of-day ratio.

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Section: Discussioncontrasting

confidence: 78%

Section: Discussioncontrasting

confidence: 78%

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confidence: 99%

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End-of-day Lighting with Different Red/Far-red Ratios Using Light-emitting Diodes Affects Plant Growth of Chrysanthemum × morifolium Ramat. ‘Coral Charm’

Lund¹,

Blom²,

Aaslyng³

2007

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“…The length of the normal photoperiod (17.25 h) may have also attenuated some EOD-FR responses. Lund et al (2007) found that chrysanthemum (Chrysanthemum morifolium) 'Coral Charm' grown under a 9-hour photoperiod and 30-minute EOD-FR treatments with R:FRs of 0.4 or 0.7 displayed increased plant height compared with an EOD-R (R:FR 5 2.4) treatment; these authors cited earlier work by Mortensen and Moe (1992) showing that natural EOD radiation quality did not affect chrysanthemum grown under longer photoperiods (12-18.5 hours), as well as work by Downs et al (1957) showing that the effect of EOD-FR on elongation was reduced for bean (Phaseolus vulgaris) when grown under longer relative to shorter photoperiods. Lund et al (2008) conducted further work using the same EOD-FR treatments and study taxa as Lund et al (2007), but with photoperiod durations of 9, 14, and 19 hours; they found EOD-FR was more effective in promoting an increase in plant height when grown under the 9-hour treatment compared with the 14-and 19-hour treatments.…”

Section: Resultsmentioning

confidence: 88%

A Low Ratio of Red to Far-red Radiation (R:FR) Throughout the Photoperiod but Not at End-of-day Promotes Shade Avoidance for Petunia ×hybrida Seedlings

Percival,

Craver

2024

horts

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Electric lighting is often necessary to achieve a target daily light integral (DLI) for the production of high-quality young annual bedding plants (plugs). Early in production, plugs have a low leaf area index that limits light interception and likely results in wasted radiation supplied by electric sources. Previous research has shown that the addition of far-red radiation (700–780 nm) to the radiation spectrum in sole-source lighting experiments or the use of end-of-day far-red (EOD-FR) radiation treatments can promote an increase in leaf expansion and leaf area for many species. However, leaf expansion in response to far-red radiation may depend on other factors such as the ratio of red (600–699 nm) to far-red radiation (R:FR) and air temperature. Thus, the objectives of this work were to examine the effects of far-red radiation applied throughout the photoperiod and as an end-of-day radiation treatment on the morphology of petunia ‘Dreams Midnight’ seedlings grown under different temperature conditions. Specifically, petunia seed was sown in 128-cell trays and moved to one of two growth chambers set at 16 or 21 °C when cotyledons unfolded. Seedlings received an equal total photon flux density (400–780 nm) of 164 µmol·m−2·s−1 for a 17.25-hour photoperiod, and either a high (∼10.7) or low R:FR (0.5). Low R:FR-treated seedlings were grown at a constant temperature of either 16 or 21 °C and placed under blackout conditions at the end of the photoperiod. High R:FR-grown seedlings received either a 1-hour end-of-day white (EOD-W) or EOD-FR treatment at the end of the photoperiod, and were grown at a constant 16 or 21 °C; one EOD-FR treatment was also shifted from the 21 °C chamber to the 16 °C at the end of the photoperiod for both the EOD-FR treatment and subsequent dark period. Seedlings were harvested at 21 and 28 days after treatment initiation. For petunia seedlings grown at 21 °C, EOD-FR treatments had minimal effect on morphology or dry mass as all measured parameters, including total and average leaf area and stem length, were similar to EOD-W treatments. In contrast, low R:FR-treated seedlings showed responses characteristic of plants grown under shade, including significant stem elongation, an increase in total and average leaf area, and a reduction in leaf mass per unit area. As expected, production at 16 °C slowed the growth of petunia seedlings resulting in much smaller plants compared with the 21 °C grown plants, but shade responses such as elongated leaves and stems under a low R:FR were apparent. The EOD-FR–treated seedlings that received the diurnal temperature shift also showed reduced leaf area and dry mass compared with their constant 21 °C counterparts. Shade responses were observable at both 16 and 21 °C for low R:FR-grown plants, but the quantifiable impact of temperature on far-red responses could not be fully determined in the present study. Further research is warranted investigating crop responses to far-red radiation as well as potential interacting environmental factors as the promotion of morphological responses, such as leaf expansion, early in production may prove a useful strategy.

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Dye Sensitized Solar Cell (DSSC) greenhouse shading: New insights for solar radiation manipulation

Roslan

Ya’acob

Radzi

et al. 2018

Renewable and Sustainable Energy Reviews

154

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Effects of Selective Screening of the Daylight Spectrum, and of Twilight on Plant Growth in Greenhouses

Cited by 6 publications

References 0 publications

End-of-day Lighting with Different Red/Far-red Ratios Using Light-emitting Diodes Affects Plant Growth of Chrysanthemum × morifolium Ramat. ‘Coral Charm’

End-of-day Lighting with Different Red/Far-red Ratios Using Light-emitting Diodes Affects Plant Growth of Chrysanthemum × morifolium Ramat. ‘Coral Charm’

A Low Ratio of Red to Far-red Radiation (R:FR) Throughout the Photoperiod but Not at End-of-day Promotes Shade Avoidance for Petunia ×hybrida Seedlings

Dye Sensitized Solar Cell (DSSC) greenhouse shading: New insights for solar radiation manipulation

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