Summary
The induction of monospore-development in the Conchocelis stage of Porphyra tenera Kjellm. was investigated.
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1.
Experiments with light-breaks during the dark-periods indicate the decisive role of a photoperiodic control.
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2.
The critical daylength is approximately 10 hr. Daily light periods longer than 10 hrs inhibit the formation of monospores.
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3.
Changes in temperature did not induce monospore formation. However, temperature influences the duration of time from photoperiodic induction until the appearance of monospores.
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4.
By experiments with light-interruption in the dark period the effectiveness of different wavelengths was tested. A strong effect is exerted by wavelengths of 674 nm and 446 nm, and a lesser effect by wavelengths of 674 nm, 553 nm and 431 nm.
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5.
Light-break experiments with red and far-red light indicate the participation of phytochrome in this photoperiodic control.
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Rentschler, HG. Photoperiodische Induktion der Monosporenbildung bei Porphyra tenera Kjellm. (rhodophyta-Bangiophyceae). Planta 76, 65–74 (1967). https://doi.org/10.1007/BF00387423
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DOI: https://doi.org/10.1007/BF00387423