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

Further aspects of the artificial illumination of plant growth chambers

1965 ◽  
Vol 10 (3) ◽  
pp. 212-229 ◽  
Author(s):  
G.A. Carpenter ◽  
L.J. Moulsley ◽  
P.A. Cottrell ◽  
R. Summerfield
Keyword(s):  
Plant Growth ◽  
Artificial Illumination ◽  
Growth Chambers

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 Air-Turbulence and Temperature Gradients Reduced in Plant Growth Chambers by Small-Hole Diffuser Walls

BioScience ◽  
1967 ◽  
Vol 17 (1) ◽  
pp. 37-37
Author(s):  
L. E. Browne ◽  
J. L. Noey ◽  
Pat C. Kerr ◽  
Alan H. Haber
Keyword(s):  
Plant Growth ◽  
Temperature Gradients ◽  
Small Hole ◽  
Air Turbulence ◽  
Growth Chambers

Atmosphere Composition Control of Spaceflight Plant Growth Growth Chambers

2000 ◽  
Author(s):  
Alex Hoehn ◽  
Louis S. Stodieck ◽  
James Clawson ◽  
Erin Robinson ◽  
Hans Seelig ◽  
...  
Keyword(s):  
Plant Growth ◽  
Composition Control ◽  
Atmosphere Composition ◽  
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.

scholarly journals AIR CIRCULATION IN GROWTH CHAMBERS STUNTS TOMATO SEEDLING GROWTH

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 684b-684
Author(s):  
Albert Liptay
Keyword(s):  
Water Stress ◽  
Plant Growth ◽  
Growth Inhibition ◽  
Seedling Growth ◽  
Continuous Exposure ◽  
Tomato Seedling ◽  
Daily Exposure ◽  
Air Movement ◽  
Growth Chambers ◽  
Air Circulation

Air circulation, generally an integral part of environmentally-controlled plant growth chambers, retarded tomato (Lycopersicon lycopersicum Karstens) seedling growth seismomorphogenetically. Continuous air movement at a speed of 0.5 to 0.7 m·s-1 inhibited growth by about 40%. Growth inhibition was noticeable with as little as 15 min of daily exposure to the air circulation; a continuous exposure gave the greatest amount of growth inhibition. The retarding effect of air on seedling growth was transient and required a continued daily exposure to air movement. Continuous aeration of seedlings inhibited growth to such an extent that in a two factor experiment, ie aeration and water stress, the water stress effects were completely masked in the aerated chamber by the aeration effect. The results have important implications for plant growth experiments in chambers equipped with air circulation: seedling growth may be affected more by the air circulation in the growth chamber than by an experimental treatment.

scholarly journals EARLY TEMPERATURES INFLUENCE BROCCOLI GROWTH AND HEAD QUALITY

HortScience ◽  
1990 ◽  
Vol 25 (8) ◽  
pp. 865C-865
Author(s):  
A. R. Jones ◽  
D. C. Sanders ◽  
R. J. Dufault
Keyword(s):  
Plant Growth ◽  
Brassica Oleracea ◽  
High Temperatures ◽  
Development Stage ◽  
Head Development ◽  
Tolerant Plant ◽  
Growth Chambers ◽  
Heat Tolerant

Three broccoli (Brassica oleracea L. Italica group) cultivars (Baccus, Packman, and Southern Comet) were grown for 14, 24, or 34 days at 22/18C (day/night) in a greenhouse. Then plants were moved to growth chambers where temperatures were maintained at 26/22, 30/26, or 34/30C and were grown for 1, 2, or 3 weeks before returning them to the greenhouse. A1 varieties when exposed to high temperatures developed smaller heads Packman when exposed to high temperatures resulted in a reduction in uniformity. Other cultivars were not effected. Lack of openness, an important marketable characteristic was reduced by high temperatures. However, Baccus at 34 days old was not effected by the heat. We would expect this response since this is the head development stage and cultivar is heat tolerant. Plant exposed to high temperatures developed heads earlier when held for 3 weeks. When plants were held at 36/30C for 3 weeks, the largest reduction in plant growth was recorded. However, all plants showed a reduction in growth when exposed to high temperatures.

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