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The sporophyte of Laminaria hyperborea produces a new frond at daylengths of up to 12 h (white light). This short-day response is completely inhibited by a 1-h white light-break given in the middle of a 16-h dark period. Temperatures of -1·5-, 2-, and 8°C were found to be favourable for new frond formation whereas 15°C was largely inhibitory.
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