PHOTOINDUCTION AND PHOTOREVERSAL OF THE NOSTOCACEAN DEVELOPMENTAL CYCLE1
- 1 March 1966
- journal article
- Published by Wiley in Journal of Phycology
- Vol. 2 (1), 7-17
- https://doi.org/10.1111/j.1529-8817.1966.tb04585.x
Abstract
The developmental cycle of Nostoc muscorum, a nitrogen-fixing blue-green alga, is controlled by the spectral quality of illumination. Red light with peak activity at 650 mμ induces development of filaments from a nonfilamentous (aseriate) stage of the life cycle. Red-light photoinduction is reversed by simultaneous or subsequent exposure to light from a broad band in the green region of the spectrum. Photo-reversibility of the red-light induction, by green light, decays very slowly, remaining at an appreciable level for over 24 hr after the primary stimulus. Allophycocyanin is indicated to be the photoreceptor for red-light induction. One or more phyco-erythrins may operate as photoreceptors for reversal of induction. The dosage response and wavelength dependence of developmental photocontrol in Nostoc muscorum A indicate that a nonphotosynthetic mechanism is involved in both developmental photoinduction and its photor ever sal.Keywords
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