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Chopper Licht , die intermittierende Belichtung Gewächshaus
Viel Erfolg Gruss Lacher
"Chopper-Light" Reduces Energy Costs of Micropropagation (From the November, 1998 issue of Agricell Report) At Berlin’s Humboldt University, I. Pinker has used intermittent lighting of shoot cultures to reduce the energy costs of micropropagation. Taking advantage of recent technology that makes it possible to switch florescent light tubes on and off for periods of microseconds, Pinker compared long-day (16 hours light, 8 hours darkness) lighting under continuous light with long day lighting under intermittent “chopper light” (100 msec light, 100 msec darkness or 20 msec light, 20 msec darkness) conditions for growth and multiplication of Prunus gladulosa, P. cerasifera, Amelanchier lamarckii and Tilia cordata.Pinker reported at the IHC that the best results were achieved with “chopper light” at a frequency of 100 msec light/100 msec darkness. At a light intensity of 80 micromol/m2/s, the growth rate was much better in “chopper light” than in continuous light in all cultures except for P. glandulosa. At a light intensity of 50 mmol/m2/s, however, no differences were observed between the continuous and intermittent lighting except for a decreased multiplication rate in P. glandulosa.
It appears that intermittent “chopper light” can be used for micropropagation of at least some species, without diminishing the multiplication rate and with an increase in growth rate. For further information: I. Pinker, Inst. of Hort., Humboldt Univ. Berlin, Wendenschloss Str. 254, 12557 Berlin, Germany.
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12 Dec 2004
20:02:28 |
K. Lacher |
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