| Records |
| Author |
Pattison, P.M.; Tsao, J.Y.; Brainard, G.C.; Bugbee, B. |
| Title |
LEDs for photons, physiology and food |
Type |
Journal Article |
| Year |
2018 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
563 |
Issue |
7732 |
Pages |
493-500 |
| Keywords |
Lighting; Human Health; Plants; Review |
Abstract  |
Lighting based on light-emitting diodes (LEDs) not only is more energy efficient than traditional lighting, but also enables improved performance and control. The colour, intensity and distribution of light can now be controlled with unprecedented precision, enabling light to be used both as a signal for specific physiological responses in humans and plants, and as an efficient fuel for fresh food production. Here we show how a broad and improved understanding of the physiological responses to light will facilitate greater energy savings and provide health and productivity benefits that have not previously been associated with lighting. |
| Address |
Utah State University, Logan, UT, USA |
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English |
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| ISSN |
0028-0836 |
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| Notes |
PMID:30464269 |
Approved |
no |
| Call Number |
GFZ @ kyba @ |
Serial |
2110 |
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| Author |
Radetsky L.; Patel J. S.; Rea M. S. |
| Title |
Continuous and Intermittent Light at Night, Using Red and Blue LEDs to Suppress Basil Downy Mildew Sporulation |
Type |
Journal Article |
| Year |
2020 |
Publication |
HortScience |
Abbreviated Journal |
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| Volume |
55 |
Issue |
4 |
Pages |
483-486 |
| Keywords |
Animals; Plants |
| Abstract |
Lighting from red and blue light-emitting diodes (LEDs) is common for crop production in controlled environments. Continuous application of red or blue light at night has been shown to suppress sporulation by Peronospora belbahrii, the causal organism of basil downy mildew (DM), but the suppressing effects of intermittent applications of red and blue LEDs have not been thoroughly researched. This study examined the effects of red (λmax = 670 nm) and blue (λmax = 458 nm) LED top lighting, at two photosynthetic photon flux densities (PPFD = ≈12 and ≈60 µmol·m−2·s−1), using continuous (10-hour) nighttime and two intermittent nighttime exposures, to suppress basil DM sporulation. The two intermittent treatments consisted of one 4-hour exposure and three 1.3-hour exposures spaced 3 hours apart. Continuous nighttime treatments with blue or red LED top lighting at ≈60 µmol·m−2·s−1 were able to suppress basil DM sporulation by more than 99%. At a given nighttime dose of light that did not completely suppress sporulation, continuous lighting was more effective than intermittent lighting, and for these partially suppressing doses, red LEDs were not significantly different from blue LEDs for suppressing sporulation. The present study showed that horticultural lighting systems using red and blue LEDs to grow crops during the day can also be used at night to suppress basil DM sporulation by up to 100%. |
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no |
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UP @ altintas1 @ |
Serial |
3143 |
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| Author |
Nelson, J.A.; Bugbee, B. |
| Title |
Economic analysis of greenhouse lighting: light emitting diodes vs. high intensity discharge fixtures |
Type |
Journal Article |
| Year |
2014 |
Publication |
PloS one |
Abbreviated Journal |
PLoS One |
| Volume |
9 |
Issue |
6 |
Pages |
e99010 |
| Keywords |
Plants |
| Abstract |
Lighting technologies for plant growth are improving rapidly, providing numerous options for supplemental lighting in greenhouses. Here we report the photosynthetic (400-700 nm) photon efficiency and photon distribution pattern of two double-ended HPS fixtures, five mogul-base HPS fixtures, ten LED fixtures, three ceramic metal halide fixtures, and two fluorescent fixtures. The two most efficient LED and the two most efficient double-ended HPS fixtures had nearly identical efficiencies at 1.66 to 1.70 micromoles per joule. These four fixtures represent a dramatic improvement over the 1.02 micromoles per joule efficiency of the mogul-base HPS fixtures that are in common use. The best ceramic metal halide and fluorescent fixtures had efficiencies of 1.46 and 0.95 micromoles per joule, respectively. We also calculated the initial capital cost of fixtures per photon delivered and determined that LED fixtures cost five to ten times more than HPS fixtures. The five-year electric plus fixture cost per mole of photons is thus 2.3 times higher for LED fixtures, due to high capital costs. Compared to electric costs, our analysis indicates that the long-term maintenance costs are small for both technologies. If widely spaced benches are a necessary part of a production system, the unique ability of LED fixtures to efficiently focus photons on specific areas can be used to improve the photon capture by plant canopies. Our analysis demonstrates, however, that the cost per photon delivered is higher in these systems, regardless of fixture category. The lowest lighting system costs are realized when an efficient fixture is coupled with effective canopy photon capture. |
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Crop Physiology Laboratory, Department of Plant Soils and Climate, Utah State University, Logan, Utah, United States of America |
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English |
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1932-6203 |
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| Notes |
PMID:24905835; PMCID:PMC4048233 |
Approved |
no |
| Call Number |
GFZ @ kyba @ |
Serial |
2233 |
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| Author |
Shillo, R., & Halevy, A. H. |
| Title |
Interaction of photoperiod and temperature in flowering-control of Gypsophila paniculata L |
Type |
Journal Article |
| Year |
1982 |
Publication |
Scientia Horticulturae |
Abbreviated Journal |
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| Volume |
16 |
Issue |
4 |
Pages |
385-393 |
| Keywords |
Plants |
| Abstract |
Long day promotes flowering of Gysophila paniculata L cultivar ‘Bristol Fairy’. Repeated treatments with GA3 or GA4 + 7 in short days did not promote flowering. The long photoperiod is effective only at relatively high temperatures. At night temperatures below 12°C, the plants remain vegetative even in long days. Efficient artificial lighting is from incandescent lamps at 60–100 lux. Fluorescent lighting (Cool-White) is not effective. Lighting of 4 hours as a night-break or at the end of the night were equally effective, but 4 hours lighting as a day-extension was less effective. Whole-night lighting promoted flowering more than any of the 4-hour lighting regimes. Cyclic lighting of one third light in each cycle promoted flowering to the same extent as continuous lighting. Light intensity during the day has a decisive effect on flower production. |
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IDA @ intern @ |
Serial |
2370 |
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| Author |
Rydin, C; Bolinder, K |
| Title |
Moonlight pollination in the gymnosperm Ephedra (Gnetales) |
Type |
Journal Article |
| Year |
2015 |
Publication |
Biology Letters |
Abbreviated Journal |
Biol. Lett. |
| Volume |
11 |
Issue |
4 |
Pages |
20140993 |
| Keywords |
Plants; anemophily; entomophily; lunar phases; nocturnal insects; lunar cycle; light at night; Ephedra; Ephedra distachya; pollination |
| Abstract |
Most gymnosperms are wind-pollinated, but some are insect-pollinated, and in Ephedra (Gnetales), both wind pollination and insect pollination occur. Little is, however, known about mechanisms and evolution of pollination syndromes in gymnosperms. Based on four seasons of field studies, we show an unexpected correlation between pollination and the phases of the moon in one of our studied species, Ephedra foeminea. It is pollinated by dipterans and lepidopterans, most of them nocturnal, and its pollination coincides with the full moon of July. This may be adaptive in two ways. Many nocturnal insects navigate using the moon. Further, the spectacular reflection of the full-moonlight in the pollination drops is the only apparent means of nocturnal attraction of insects in these plants. In the sympatric but wind-pollinated Ephedra distachya, pollination is not correlated to the full moon but occurs at approximately the same dates every year. The lunar correlation has probably been lost in most species of Ephedra subsequent an evolutionary shift to wind pollination in the clade. When the services of insects are no longer needed for successful pollination, the adaptive value of correlating pollination with the full moon is lost, and conceivably also the trait. |
| Address |
Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm 106 91, Sweden |
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Royal Society |
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English |
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English |
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no |
| Call Number |
IDA @ john @ |
Serial |
1143 |
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