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J Bacteriol. 1971 March; 105(3): 685-689
Copyright © 1971 American Society for Microbiology. All Rights Reserved.

Heterotrophic Growth of Blue-Green Algae in Dim Light

The University of Texas, Marine Science Institute, Port Aransas, Texas 78373
Microbiology Department, The University of Texas at Austin, Texas 78712

ABSTRACT

A unicellular blue-green alga, Agmenellum quadruplicatum, and a filamentous blue-green alga, Lyngbya lagerheimíi, were grown heterotrophically in dim light with glucose as major source of carbon and possibly energy. The dim-light conditions did not support autotrophic growth. The two blue-green algae appeared to have the same metabolic block, namely an incomplete tricarboxylic acid cycle, as has been found in other obligately phototrophic blue-green algae. Under dim-light conditions, glucose made a greater contribution to cell constituents (amino acids) of A. quadruplicatum and L. lagerheimii than under high-light conditions.