| Records |
| Author |
Eng, R.Y.N.; Tsujita, M.J.; Grodzinski, B. |
| Title |
The effects of supplementary HPS lighting and carbon dioxide enrichment on the vegetative growth, nutritional status and flowering characteristics ofChrysanthemum morifoliumRamat |
Type |
Journal Article |
| Year |
1985 |
Publication |
Journal of Horticultural Science |
Abbreviated Journal |
Journal of Horticultural Science |
| Volume |
60 |
Issue |
3 |
Pages |
389-395 |
| Keywords |
Plants |
Abstract  |
Supplementary high pressure sodium (HPS) lighting (140 µmol m−2s−1) and CO2 enrichment (1375 µl l−1) improved the vegetative growth of Chrysanthemum morifolium cv Dramatic by increases in stem length, stem diameter, root weight ratio, dry weight, relative growth and net assimilation rates. Three-week-old chrysanthemums grown under CO2 enrichment and HPS lighting had lower leaf weight and stem weight ratios as well as lower foliar nutrient content than those grown under ambient CO2 and natural light. Plants grown on to maturity under CO2 enrichment and supplementary HPS lighting had the longest stem lengths, the most flowers and greatest increase in dry weight. The combination of both additional light and CO2 was superior to either factor used alone. With 24 h HPS supplementary lighting CO2 enrichment was most effective in improving vegetative growth and flower quality when applied during the daytime. Night CO2 enrichment was not commercially beneficial at the light levels employed in this study. |
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0022-1589 |
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IDA @ intern @ |
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2373 |
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| Author |
Patel, J.S.; Radetsky, L.; Rea, M.S. |
| Title |
The Value of Red Light at Night for Increasing Basil Yield |
Type |
Journal Article |
| Year |
2018 |
Publication |
Canadian Journal of Plant Science |
Abbreviated Journal |
Can. J. Plant Sci. |
| Volume |
98 |
Issue |
6 |
Pages |
1321-1330 |
| Keywords |
Plants |
| Abstract |
Sweet basil (<i>Ocimum basilicum L.</i>) is primarily used for culinary purposes, but it is also used in the fragrance and medicinal industries. In the last few years, global sweet basil production has been significantly impacted by downy mildew caused by <i>Peronospora belbahrii</i>. Nighttime exposure to red light has been shown to inhibit sporulation of <i>P. belbahrii</i>. The objective of this study was to determine if nighttime exposure to red light from light-emitting diodes (LEDs; λ<sub>max</sub> = 625 nm) could increase plant growth (plant height and leaf size) and yield (number and weight of leaves) in basil plants. In two sets of greenhouse experiments, red light was applied at a photosynthetic photon flux density (PPFD) of 60 µmol m<sup>-2</sup> s<sup>-1</sup> during the otherwise dark night for 10 hours (from 20:00 to 06:00). The results demonstrate that exposure to red light at night can increase the number of basil leaves per plant, plant height, leaf size (length and width), and leaf fresh and dry weight, compared to plants in darkness at night. The addition of incremental red light at night has the potential to be cost-effective for fresh organic basil production in controlled environments. |
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0008-4220 |
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GFZ @ kyba @ |
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1955 |
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| Author |
Schroer, S.; Hölker, F. |
| Title |
Impact of Lighting on Flora and Fauna |
Type |
Book Chapter |
| Year |
2016 |
Publication |
Handbook of Advanced Lighting Technology |
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Pages |
1-33 |
| Keywords |
Ecology; Lighting; Artificial light at night; ALAN; Plants; Animals; review |
| Abstract |
Technology, especially artificial light at night (ALAN), often has unexpected impacts on the environment. This chapter addresses both the perception of light by various organisms and the impact of ALAN on flora and fauna. The responses to ALAN are subdivided into the effects of light intensity, color spectra, and duration and timing of illumination. The ways organisms perceive light can be as variable as the habitats they live in. ALAN often interferes with natural light information. It is rarely neutral and has significant impacts beyond human perception. For example, UV light reflection of generative plant parts or the direction of light is used by many organisms as information for foraging, finding spawning sites, or communication. Contemporary outdoor lighting often lacks sustainable planning, even though the protection of species, habitat, and human well-being could be improved by adopting simple technical measures. The increasing use of ALAN with high intensities in the blue part of the spectrum, e.g., fluorescent light and LEDs, is discussed as a critical trend. Blue light is a major circadian signal in higher vertebrates and can substantially impact the orientation of organisms such as numerous insect species. A better understanding of how various types and sources of artificial light, and how organisms perceive ALAN, will be an important step towards more sustainable lighting. Such knowledge is the basis for sustainable lighting planning and the development of solutions to protect biodiversity from the effects of outdoor lighting. Maps that describe the rapid changes in ALAN are urgently needed. In addition, measures are required to reduce the increasing use and intensity of ALAN in more remote areas as signaling thresholds in flora and fauna at night are often close to moonlight intensity and far below streetlight levels. |
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Leibniz Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587, Berlin, Germany; schroer(at)igb-berlin.de |
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Springer |
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English |
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English |
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978-3-319-00295-8 |
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IDA @ john @ |
Serial |
1470 |
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| Author |
Singhal, R. K., Kumar, V., Kumar, M., & Bose, B. |
| Title |
Responses of different light intensities and continue light during dark period on rice (Oryza sativa L.) seed germination and seedling development |
Type |
Journal Article |
| Year |
2019 |
Publication |
Journal of Pharmacognosy and Phytochemistry |
Abbreviated Journal |
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| Volume |
8 |
Issue |
4 |
Pages |
2602-2609 |
| Keywords |
Plants |
| Abstract |
Temperature, humidity and moisture content are the important abiotic component regulating seedling establishment in plants including rice. Light factor intensity and duration are also important environmental factors regulating rice growth and development. In the growth and development of rice crop germination followed by seedling establishment is the foremost and very important growth stages. Light component such as intensity, direction and duration are the regulating factor for several physiological, biochemical and molecular processes in plants. To consider these facts, in the present piece of work rice seed of HUR-105 grown under different light regimes, from T1 (2000 lux for 12 h during day time + 12 h dark period) (lower light intensity), T2 (4000 lux for 12 h during day time+ 12 h dark period), T3 (6000 lux for 12 h during day time + 12 h dark period) (moderate), T4 (9000 lux for 12 h during day time + 12 h dark period) (optimum) and to T5 (9000 lux for 12h during day time + 200 lux for 12 h during night time). Germination, seedling growth and biochemical parameters were observed at different time intervals. It was observed that germination %, germination index (GI), germination rate index (GRI), coefficient of velocity of germination (CVG), mean germination rate (MGR), seedling vigour (SV), α-amylase activity and soluble sugar content significantly reduced in both the treatments T1 and T5. Further, the mean time germination and insoluble sugar content were increased in T1 and T5 treatment. The present experiment concluded that both lower light intensity (T1) and addition of low light during dark period (considered as night light pollution) causes stress condition and reduce germination and seedling establishment potential of rice crop. |
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IDA @ intern @ |
Serial |
2738 |
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| Author |
Supronowicz, R.; Fryc, I. |
| Title |
Urban park lighting as a source of botanical light pollution |
Type |
Journal Article |
| Year |
2019 |
Publication |
Photonics Letters of Poland |
Abbreviated Journal |
Photon.Lett.PL |
| Volume |
11 |
Issue |
3 |
Pages |
90 |
| Keywords |
Plants |
| Abstract |
That paper describesthe relative impact of anartificial lighting deviceon botanical light pollution, consideringspectral power distribution (SPD in the lighting area. This impact is described by the Relative-to-Moon Photosynthesis Index (RMPI)and Induced Phytochrome Index (IPr). We found that in the case when lighting is realized by using LED luminaires instead of high-pressure sodium (HPS) or metal halide (MH) lamps, the influence of spectral light on plant vegetation process amplifies. Additionally,our research shows that estimating botanical light pollution on the basis of lamps’CCT is not the best method and that using SPD is better for this purpose. |
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2080-2242 |
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GFZ @ kyba @ |
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2691 |
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