scholarly journals Studies on the Effectiveness of Fluorescent Lamps for Promoting Plant Growth

1968 ◽  
Vol 5 (2) ◽  
pp. 85-89
Author(s):  
Takeharu BOKURA
Keyword(s):  
Plant Growth ◽  
Fluorescent Lamps

Plant growth with new fluorescent lamps

Planta ◽  
1966 ◽  
Vol 72 (2) ◽  
pp. 198-207 ◽  
Author(s):  
Aubrey S. Thomas ◽  
Stuart Dunn
Keyword(s):  
Plant Growth ◽  
Fluorescent Lamps

Quality and Intensity of Light in the In Vitro Development of Microstumps of Eucalyptus urophylla in a Photoautotrophic System

2020 ◽  
Vol 66 (6) ◽  
pp. 754-760 ◽  
Author(s):  
Natane A Miranda ◽  
Aloisio Xavier ◽  
Wagner C Otoni ◽  
Ricardo Gallo ◽  
Kellen C Gatti ◽  
...  
Keyword(s):  
Plant Growth ◽  
Light Quality ◽  
Stomatal Density ◽  
Carotenoid Content ◽  
Fluorescent Light ◽  
Eucalyptus Urophylla ◽  
Light Emitting ◽  
Fluorescent Lamps ◽  
Number Of Shoots

Abstract The quality and quantity of light are important factors in controlling in vitro plant growth in photoautotrophic systems. The aim of this study was to evaluate the influence of light quality (fluorescent, white, red, blue, red/blue, and distant red) on microstumps of a Eucalyptus urophylla clone in an in vitro photoautotrophic system, as well as the intensity of fluorescent light (60, 85, 100, and 140 μmol m–2 s–1) in the growth and production of microcutting. The number of shoots and microcutting, the size of the largest shoot, the stomatal density, chlorophyll, and carotenoid content were analyzed. Light quality altered plant growth, and fluorescent light intensity did not affect the microstumps’ production during the evaluation period. In white light-emitting diode (LED) light, there was higher production of carotenoids, with a lower initial production of microcuttings. A smaller number of shoots were obtained in blue LED. In general, the different qualities and light intensities tested allowed for the growth of the Eucalyptus urophylla clone grown in vitro, making it possible to obtain microcuttings under photoautotrophic cultivation. Study Implications In vitro propagation is a stressful process for plants and has limitations for commercial-scale Eucalyptus production. Fluorescent lamps, closed containers, and high sucrose concentrations are traditionally used. To reduce costs and improve production, the use of efficient light sources and photoautotrophic cultivation systems become alternatives. This study investigated the influence of light on the in vitro growth of a Eucalyptus clone in a photoautotrophic system. The quality was more important than the intensity of light. Foresters will be able to indicate the use of LEDs (light-emitting diodes) as a replacement for fluorescent lamps. This approach is useful in enhancing micropropagation techniques.

scholarly journals A MODIFIED CIRCUIT FOR SLIMLINE FLUORESCENT LAMPS FOR PLANT GROWTH CHAMBERS

1950 ◽  
Vol 25 (1) ◽  
pp. 86-91 ◽  
Author(s):  
M. W. Parker ◽  
H. A. Borthwick
Keyword(s):  
Plant Growth ◽  
Fluorescent Lamps ◽  
Growth Chambers

scholarly journals Effects of Frequency and Duty Ratio on the Growth of Potato Plantlets In Vitro Using Light-emitting Diodes

HortScience ◽  
2004 ◽  
Vol 39 (2) ◽  
pp. 375-379 ◽  
Author(s):  
Ruey-Chi Jao ◽  
Wei Fang
Keyword(s):  
Plant Growth ◽  
Light Emitting Diodes ◽  
Heat Removal ◽  
Duty Ratio ◽  
Intermittent Light ◽  
Light Emitting ◽  
Fluorescent Lamps ◽  
Fluctuating Light ◽  
Potato Plantlets

Effects of intermittent light on photomixotrophic growth of potato plantlets in vitro and the electrical savings that could be realized by adjusting the frequency and duty ratio of light-emitting diodes (LEDs) were investigated and compared to the use of conventional tubular fluorescent lamps (TFLs). TFLs provide continuous fluctuating light at 60 Hz and LEDs provide continuous nonfluctuating or intermittent/pulse light depend on the preset frequency and duty ratio. In total, eight treatments were investigated with varying light source, frequency, duty ratio and photoperiod. Results indicated that if growth rate is the only concern, LEDs at 720 Hz [1.4 milliseconds (ms)] and 50% duty ratio with 16-h light/8-h dark photoperiod stimulated plant growth the most. However, if energy consumption is the major concern, using LEDs at 180 Hz (5.5 ms) and 50% duty ratio with 16-h light/8-h dark photoperiod would be the best choice for illuminating potato plantlets without significantly sacrificing plant growth, especially when energy for heat removal is also considered.

PLANT GROWTH UNDER WHITE LEDS COMPARED WITH UNDER FLUORESCENT LAMPS

2011 ◽  
pp. 227-232 ◽  
Author(s):  
A. Kato ◽  
Y. Morio ◽  
K. Murakami ◽  
K. Nakamura
Keyword(s):  
Plant Growth ◽  
White Leds ◽  
Fluorescent Lamps

scholarly journals The Effect of UV-B Lamp Light on the Growth of Three Bedding Plant Species

HortScience ◽  
1997 ◽  
Vol 32 (4) ◽  
pp. 589A-589
Author(s):  
Martin Meeks ◽  
H. Brent Pemberton ◽  
Lurline Marsh ◽  
Garry V. McDonald
Keyword(s):  
Lycopersicon Esculentum ◽  
Plant Growth ◽  
Growth Regulators ◽  
Natural Light ◽  
Fluorescent Lamp ◽  
Tomato Seedlings ◽  
Fluorescent Lamps ◽  
Bedding Plant ◽  
Alternative Means ◽  
Cucumis Sativa

The effect of UV-B fluorescent lamp light on seedling elongation was investigated using three species: marigold (Tagetes sp.), cucumber (Cucumis sativa), and tomato (Lycopersicon esculentum). Seedlings were exposed to light supplied from two unshielded and unfiltered 40-watt UV-B fluorescent lamps. In two experiments, seedlings were placed a distance of 45 cm below the light for varying lengths of time, while seedlings were placed 60 cm below the light in a third experiment. For marigold, seedlings were shorter when germinated under the UV-B lamp than when germinated under natural light in a glasshouse. Two hours of exposure just after glasshouse germination (cotyledons unfolded) was effective in reducing height of cucumber seedlings, whereas 6 hours was required to significantly reduce the height of tomato seedlings. Treatments were still effective when the last measurements were taken 12 to 14 days after germination. Exposure of seedlings to UV-B lamp light provides a possible alternative means of preventing excessive seedling elongation instead of relying on chemical plant growth regulators.

scholarly journals Continuous Irradiation with Alternating Red and Blue Light Enhances Plant Growth While Keeping Nutritional Quality in Lettuce

HortScience ◽  
2018 ◽  
Vol 53 (12) ◽  
pp. 1804-1809 ◽  
Author(s):  
Noriko Ohtake ◽  
Masaharu Ishikura ◽  
Hiroshi Suzuki ◽  
Wataru Yamori ◽  
Eiji Goto
Keyword(s):  
Plant Growth ◽  
Leaf Area ◽  
Blue Light ◽  
Nutritional Quality ◽  
Continuous Irradiation ◽  
Light Emitting ◽  
Artificial Lighting ◽  
Fluorescent Lamps ◽  
High Concentrations ◽  
Net Assimilation

Plant factories with artificial lighting have been developed to improve food production, functional ingredients, and profitability. Intensive research has been performed to elucidate the effects of light intensity and wavelength on plant growth and nutritional quality with the use of light-emitting diodes (LEDs). In particular, the effects of monochromatic red, blue, or simultaneous red + blue light have been studied because these wavelengths are predominantly used for photosynthesis. We examined the effects of alternating red and blue light provided by LEDs over a period of 24 hours on the growth and nutritional properties of leafy lettuce. The results clearly show that alternating red and blue light accelerated plant growth significantly compared with white fluorescent lamps or red and blue LEDs at the same daily light integral. Plants grown under alternating red/blue light had a greater net assimilation rate and total and projected leaf area (an indicator of the fraction of leaf area that absorbs more light) than other plants. Additionally, alternating red and blue light maintained high concentrations of sugars, ascorbic acid, and anthocyanins in leaves. Taken together, the results indicate that continuous irradiation with alternating red and blue light could enhance growth while maintaining the nutritional quality in lettuce.

scholarly journals Green-light Supplementation for Enhanced Lettuce Growth under Red- and Blue-light-emitting Diodes

HortScience ◽  
2004 ◽  
Vol 39 (7) ◽  
pp. 1617-1622 ◽  
Author(s):  
Hyeon-Hye Kim ◽  
Gregory D. Goins ◽  
Raymond M. Wheeler ◽  
John C. Sager
Keyword(s):  
Plant Growth ◽  
Light Source ◽  
Blue Light ◽  
Light Emitting Diodes ◽  
Green Light ◽  
Light Sources ◽  
Natural Setting ◽  
Light Emitting ◽  
Fluorescent Lamps ◽  
Green Fluorescent

Plants will be an important component of future long-term space missions. Lighting systems for growing plants will need to be lightweight, reliable, and durable, and light-emitting diodes (LEDs) have these characteristics. Previous studies demonstrated that the combination of red and blue light was an effective light source for several crops. Yet the appearance of plants under red and blue lighting is purplish gray making visual assessment of any problems difficult. The addition of green light would make the plant leave appear green and normal similar to a natural setting under white light and may also offer a psychological benefit to the crew. Green supplemental lighting could also offer benefits, since green light can better penetrate the plant canopy and potentially increase plant growth by increasing photosynthesis from the leaves in the lower canopy. In this study, four light sources were tested: 1) red and blue LEDs (RB), 2) red and blue LEDs with green fluorescent lamps (RGB), 3) green fluorescent lamps (GF), and 4) cool-white fluorescent lamps (CWF), that provided 0%, 24%, 86%, and 51% of the total PPF in the green region of the spectrum, respectively. The addition of 24% green light (500 to 600 nm) to red and blue LEDs (RGB treatment) enhanced plant growth. The RGB treatment plants produced more biomass than the plants grown under the cool-white fluorescent lamps (CWF treatment), a commonly tested light source used as a broad-spectrum control.

scholarly journals Comparing the growth characteristics of some vegetables under 4-band fluorescent lamps for plant growth

1994 ◽  
Vol 78 (Appendix) ◽  
pp. 327-328
Author(s):  
Katsusuke Murakami ◽  
Kimitoshi Horaguchi ◽  
Toshiki Minami ◽  
Ichiro Aiga
Keyword(s):  
Plant Growth ◽  
Growth Characteristics ◽  
Fluorescent Lamps
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