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Shillo, R., & Halevy, A. H. |
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Title |
Interaction of photoperiod and temperature in flowering-control of Gypsophila paniculata L |
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1982 |
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Scientia Horticulturae |
Abbreviated Journal |
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16 |
Issue |
4 |
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385-393 |
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Plants |
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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 @ |
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2370 |
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Author |
Myers, L.; Christian, K.; Kirchner, R. |
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Title |
Flowering responses of 48 lines of oilseed rape (Brassica spp.) to vernalization and daylength |
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Journal Article |
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Year |
1982 |
Publication |
Australian Journal of Agricultural Research |
Abbreviated Journal |
Aust. J. Agric. Res. |
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33 |
Issue |
6 |
Pages |
927 |
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Plants |
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Forty-eight lines of Brassica spp, of diverse origins were grown in the glasshouse either under natural daylengths or daylengths extended to 16 h by artificial illumination. Plants were either unvernalized or had been subjected to 6 weeks at 8¦C day and 6¦C night temperatures as seedlings. Lines could be classified into two major groups, according to whether or not vernalization or long photoperiods were essential for 50% flowering within 21 weeks. In six lines, both vernalization and long days were essential for prompt flowering, while only five lines did not respond to either treatment. Strong interactions between lines and treatments were found in the number of leaves and subtended buds at flowering. The results show that a wide range of responses is obtainable from material currently available, offering considerabk, scope for adaptation to different environments. |
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0004-9409 |
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IDA @ intern @ |
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2369 |
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Kadman-Zahavi, A., & Ephrat, E. |
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Title |
The efficiency of different light sources in inducing spray carnation flowering |
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Journal Article |
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Year |
1982 |
Publication |
Scientia Horticulturae |
Abbreviated Journal |
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18 |
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159--167 |
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Plants |
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Light from Gro-lux fluorescent lamps, as a 4-h night break, was found to be more effective than incandescent light in promoting spray carnation flowering under natural daylight conditions. When the illuminations were applied for 4 h in the middle of the night, the effectiveness of a certain amount of radiant energy from incandescent light was found to be the same whether applied as intermittent or as continuous illumination. |
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2371 |
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Author |
Arnott, J. T. |
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Title |
Growth Response of White and Englemann Spruce Seedlings to Extended Photoperiod Using Three Light Intensities |
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1982 |
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Technical Report: Pacific Forestry Centre |
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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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IDA @ intern @ |
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2372 |
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Author |
Tinus, R. W. |
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Title |
Effects of Extended Photoperiod on Southern Rocky Mountain Engelmann Spruce and Douglas-fir |
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Year |
1981 |
Publication |
Tree Planters' Notes |
Abbreviated Journal |
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Volume |
32 |
Issue |
4 |
Pages |
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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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IDA @ intern @ |
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2368 |
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