Action Spectrum for Developmental Photo-Induction of the Blue-Green Alga Nostoc muscorum

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Science  24 Aug 1962:
Vol. 137, Issue 3530, pp. 603-604
DOI: 10.1126/science.137.3530.603


The dark-grown cyanophyte requires a brief exposure to light from the 650 mµ region of the spectrum before it can complete its developmental cycle. Induction is reversed by exposure to green light. A blue protein, presumably allophycocyanin (absorption maximum, 650 mµ) has been demonstrated in aqueous extracts of the cyanophycean cells.