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Author |
Adams, J. |
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Title |
The Effect on Certain Plants of altering the Daily Period of Light |
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Journal Article |
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1923 |
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Annals of Botany |
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37 |
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145 |
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75-94 |
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Plants |
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GFZ @ kyba @ |
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2406 |
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Author |
Adams, J. |
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Title |
Duration of Light and Growth |
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Journal Article |
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1924 |
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Annals of Botany |
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38 |
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151 |
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509-523 |
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Plants |
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GFZ @ kyba @ |
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2391 |
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Author |
ffrench-Constant, R.; Somers-Yeates, R.; Bennie, J.; Economou, T.; Hodgson, D.; Spalding, A.; McGregor, P. |
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Title |
Light pollution is associated with earlier tree budburst across the United Kingdom |
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Journal Article |
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Year |
2016 |
Publication |
Proceedings of the Royal Society B: Biological Sciences |
Abbreviated Journal |
Proc Roy Soc B Biol Sci |
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Volume |
283 |
Issue |
1833 |
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1-9 |
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Plants; light pollution, phenology, species interactions, tree budburst, temperature, urban heat islands; United Kingdom |
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The ecological impact of night-time lighting is of concern because of its well-demonstrated effects on animal behaviour. However, the potential of light pollution to change plant phenology and its corresponding knock-on effects on associated herbivores are less clear. Here, we test if artificial lighting can advance the timing of budburst in trees. We took a UK-wide 13 year dataset of spatially referenced budburst data from four deciduous tree species and matched it with both satellite imagery of night-time lighting and average spring temperature. We find that budburst occurs up to 7.5 days earlier in brighter areas, with the relationship being more pronounced for later-budding species. Excluding large urban areas from the analysis showed an even more pronounced advance of budburst, confirming that the urban ‘heat-island’ effect is not the sole cause of earlier urban budburst. Similarly, the advance in budburst across all sites is too large to be explained by increases in temperature alone. This dramatic advance of budburst illustrates the need for further experimental investigation into the impact of artificial night-time lighting on plant phenology and subsequent species interactions. As light pollution is a growing global phenomenon, the findings of this study are likely to be applicable to a wide range of species interactions across the world. |
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Centre for Ecology and Conservation, and 2 Environment and Sustainability Institute, University of Exeter, Penryn TR10 9EZ, UK; rf222(at)exeter.ac.uk |
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Royal Society |
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English |
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English |
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IDA @ john @ |
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1472 |
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Author |
Gómez, C.; Mitchell, C.A. |
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Title |
Physiological and Productivity Responses of High-wire Tomato as Affected by Supplemental Light Source and Distribution within the Canopy |
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Journal Article |
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Year |
2016 |
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Journal of the American Society for Horticultural Science |
Abbreviated Journal |
J. Amer. Soc. Hort. Sci. |
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Volume |
141 |
Issue |
2 |
Pages |
196-208 |
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Plants; tomato; LED; LED lighting; Solanum lycopersicum; intracanopy lighting; greenhouses; intracanopy supplemental lighting; daily light integral |
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The relative coolness-to-touch of light-emitting diodes (LEDs) has enabled commercial implementation of intracanopy lighting (ICL) in the greenhouse. Intracanopy lighting, which refers to the strategy of lighting along the side or from within the foliar canopy, can increase canopy photosynthetic activity, but physiological and productivity responses of high-wire greenhouse tomato (Solanum lycopersicum) to intracanopy supplemental lighting (SL) still are not yet fully understood. Two consecutive production experiments were conducted across seasons in a glass-glazed greenhouse located in a midnorthern, continental climate [lat. 40°N (West Lafayette, IN)]. Plants were grown from winter-to-summer [increasing solar daily light integral (DLI)] and from summer-to-winter (decreasing solar DLI) to compare three SL strategies for high-wire tomato production across changing solar DLIs: top lighting with high-pressure sodium lamps (HPS) vs. intracanopy LED vertical towers vs. hybrid SL (HPS + horizontal ICL-LEDs). A control treatment also was included for which no SL was provided. Supplemental DLI for each experimental period was adjusted monthly, to complement seasonal changes in sunlight, aiming to approach a target total DLI of 25 mol·m‒2·d‒1 during fruit set. Harvest parameters (total fruit fresh weight, number of fruit harvested, and average cluster fresh weight), tissue temperature, chlorophyll fluorescence, and stomatal conductance (gS) were unaffected by SL treatment in both experiments. Among the physiological parameters evaluated, CO2 assimilation measured under light-saturating conditions, light-limited quantum-use efficiency, and maximum gross CO2 assimilation (Amax) proved to be good indicators of how ICL reduces the top-to-bottom decline in leaf photosynthetic activity otherwise measured with top lighting only (HPS-SL or solar). Although SL generally increased fruit yield relative to control, lack of SL treatment differences among harvest parameters indicates that higher crop photosynthetic activity did not increase fruit yield. Compared with control, intracanopy SL increased yield to the same extent as top SL, but the remaining photoassimilate from ICL most likely was partitioned to maintain nonharvested, vegetative plant parts as well. |
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Department of Horticulture and Landscape Architecture, Purdue University, 625 Agriculture Mall Drive, West Lafayette, IN 47907-2010 |
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American Society for Horticultural Science |
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Engligh |
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0003-1062 |
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IDA @ john @ |
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1431 |
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Kwak, M.; Je, S.; Cheng, H.; Seo, S.; Park, J.; Baek, S.; Khaine, I.; Lee, T.; Jang, J.; Li, Y.; Kim, H.; Lee, J.; Kim, J.; Woo, S. |
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Title |
Night Light-Adaptation Strategies for Photosynthetic Apparatus in Yellow-Poplar (Liriodendron tulipifera L.) Exposed to Artificial Night Lighting |
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Journal Article |
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Year |
2018 |
Publication |
Forests |
Abbreviated Journal |
Forests |
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Volume |
9 |
Issue |
2 |
Pages |
74 |
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Keywords |
Plants |
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Abstract |
Plants can undergo external fluctuations in the natural light and dark cycle. The photosynthetic apparatus needs to operate in an appropriate manner to fluctuating environmental factors, especially in light. Yellow-poplar seedlings were exposed to nighttime artificial high-pressure sodium (HPS) lighting to evaluate night light-adaptation strategies for photosynthetic apparatus fitness relative to pigment contents, photosystem II photochemistry, photosynthetic parameters, histochemical analysis of reactive oxygen species, and plant biomass. As a result, seedlings exhibited dynamic changes including the enhancement of accessory pigments, the reduction of photosystem II photochemistry, increased stomatal limitation, downregulation of photosynthesis, and the decreased aboveground and belowground biomass under artificial night lighting. Histochemical analysis with 3,3′-diaminobenzidine (DAB) and nitroblue tetrazolium (NBT) staining indicates the accumulation of in situ superoxide radicals (O2−) and hydrogen peroxide (H2O2) in leaves exposed to the lowest level of artificial night lighting compared to control. Moreover, these leaves exposed to artificial night lighting had a lower nighttime respiration rate. These results indicated that HPS lighting during the night may act as a major factor as repressors of the fitness of photosynthesis and growth patterns, via a modification of the photosynthetic light harvesting apparatus. |
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1999-4907 |
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LoNNe @ kyba @ |
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1809 |
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