Abstract
Mutants ofAnabaena variabilis Kutz. that have a decreased ability to grow photoautotrophically have been isolated by a modification of the techniques used to isolate auxotrophic mutants of that filamentous cyanobacterium, and have been stably propagated. Three mutants have a reduced content of phycocyanin and, as determined by in situ assays of partial reaction sequences of photosynthesis, an impairment in photosystem II. Three other strains, all of which appear to have a normal complement of carotenoids when grown heterotrophically, are sensitive to light.
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