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Author Arnott, J. T. url  openurl
  Title Growth Response of White and Englemann Spruce Seedlings to Extended Photoperiod Using Three Light Intensities Type Report
  Year (down) 1982 Publication Technical Report: Pacific Forestry Centre Abbreviated Journal  
  Volume Issue Pages  
  Keywords Plants  
  Abstract Four seedlots of white spruce (Picea glauca (Moench) Voss) and three of Engelmann spruce (Picea engelmannii Parry), covering a range of 10 degrees of latitude and a range of altitudes, were sown in BC/ CFS Styroblocks and grown in a heated greenhouse and an unheated shadehouse, using incandescent light to provide a 19-h photoperiod. Four intensities of lighting were used: 0, 100,200, and 400 Ix. A second experiment with the same seedlots was conducted in growth rooms that were programmed to evaluate the effect of low night temperature on seedling shoot growth when the photoperiod was extended to 19 h, using a light intensity of 200 Ix.

Shoot length of white and Engelmann spruce seedlings grown under an extended daylength of 100 Ix were significantly taller than the control (0 Ix). There were no significant differences in shoot length or weight among the three intensities of light used to extend the photoperiod for all seedlots except the southern latitude-low elevation population of Engelmann spruce. The more northern populations of white spruce and the high altitude populations of Engelmann spruce did not require light intensities higher than 100 Ix to maintain apical growth. Low night temperature (7°C) did produce significantly smaller seedlings than the warm night (1SoC) regime. However, terminal resting buds of seedlings grown under the cool night regime did not form any sooner than on those seedlings grown under warm nights.
 
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  Notes Approved no  
  Call Number IDA @ intern @ Serial 2372  
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Author Tinus, R. W. url  openurl
  Title Effects of Extended Photoperiod on Southern Rocky Mountain Engelmann Spruce and Douglas-fir Type Journal Article
  Year (down) 1981 Publication Tree Planters' Notes Abbreviated Journal  
  Volume 32 Issue 4 Pages  
  Keywords Plants  
  Abstract Four sources of Engelmann spruce and two of Douglas-fir were grown under eight different extended photoperiod regimes. Incandescent light 1 minute of every 15 at night at 270 lux was more effective than continuous incandescent at 1200 lux or intermittent fluorescent at 950 lux at preventing bud dormancy and maintaining continuous height growth.  
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  Notes Approved no  
  Call Number IDA @ intern @ Serial 2368  
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Author Lawrence, B.K.; Fehr, W.R. url  doi
openurl 
  Title Reproductive Response of Soybeans to Night Interruption1 Type Journal Article
  Year (down) 1981 Publication Crop Science Abbreviated Journal  
  Volume 21 Issue 5 Pages 755  
  Keywords Plants  
  Abstract Artificial lights may be used to delay flowering of soybean [Glycine max (L.) Merr.] cultivars. Previous research has suggested that night interruption imposed every other night would delay flowering as much as every-night interruption. Our objective was to evaluate the reproductive development of cultivars when exposed to night interruption every night compared with exposure every other night. One cultivar of each Maturity Group 00 through V was grown in the field at Ames, Iowa during 1978 and 1979. The four light treatments imposed every night or every other night included illumination with incandescent light from sunset to sunrise, 2300 to 0030 hours, 0030 to 0200 hours, or 0200 to 0330 hours. Control plots were not exposed to artificial light.

The average number of days that reproductive development was delayed beyond the control was twice as great for the every-night treatments as for the every-other-night treatments. Illumination from sunset to sunrise delayed reproductive development significantly more than the treatments of night interruption for 1.5 hours. Night interruption near the end of the dark period (0200 to 0330 hours) delayed reproductive development more than the earlier interruptions.

The results did not support the hypothesis that light treatments every other night would delay reproductive development as much as every-night interruptions. The lighting regime needed to delay reproductive development will depend on the photoperiod requirements of the cultivars and duration of the delay that is desired.
 
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  ISSN 0011-183X ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number IDA @ intern @ Serial 2367  
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Author Cathey, H. M., & Campbell, L. E. url  openurl
  Title Security lighting and its impact on the landscape. Type Journal Article
  Year (down) 1975 Publication Journal Of Arboriculture Abbreviated Journal  
  Volume 1 Issue Pages 181–187  
  Keywords Plants  
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  Notes Approved no  
  Call Number LoNNe @ kagoburian @ Serial 653  
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Author Bunning, E.; Moser, I. url  doi
openurl 
  Title Interference of moonlight with the photoperiodic measurement of time by plants, and their adaptive reaction Type Journal Article
  Year (down) 1969 Publication Proceedings of the National Academy of Sciences of the United States of America Abbreviated Journal Proc Natl Acad Sci U S A  
  Volume 62 Issue 4 Pages 1018-1022  
  Keywords Plants; Moonlight  
  Abstract Threshold values of photoperiodic time-measurements correspond approximately to moonlight intensities. Experiments with Glycine and Euglena reveal that this is also the threshold value for synchronization of the circadian cycle. Saturation of this reaction is reached with 10 lx in 12:12 hr light-dark cycles. Thus, moonlight might disturb time measurement.In Glycine, Arachis, and Trifolium the intensity of the light coming from the moon to the upper surface of the leaf is reduced by circadian leaf movement to values between 5 and 20 per cent (or even less than 5 per cent) of full-moon light intensity. Such a reduction eliminates the disturbing effects of moonlight. This finding indicates that leaf movements have an adaptive value of the kind that Darwin sought to identify. It also indicates that the behavior of the upper leaf epidermis as a “sense organ for light”(13) has an adaptive value.In the short-day plants Perilla ocymoides and Chenopodium amaranticolor, a specific photoperiodic phenomenon was found that counteracts the disturbing effect of moonlight. Here light intensities similar to those of moonlight, introduced during the night, promote flowering instead of inhibiting it.  
  Address Institute Of Biology, University Of Tubingen, Germany  
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  Language English Summary Language Original Title  
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  ISSN 0027-8424 ISBN Medium  
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  Notes PMID:16591742; PMCID:PMC223607 Approved no  
  Call Number GFZ @ kyba @ Serial 3035  
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