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Appl Environ Microbiol. 1989 March; 55(3): 758-760
Copyright © 1989, American Society for Microbiology. All Rights Reserved.

Nitrogen-Fixing Cyanobacterium with a High Phycoerythrin Content

Herminia Rodriguez, Joaquin Rivas, Miguel G. Guerrero* and Manuel Losada

Instituto de Bioquímica Vegetal y Fotosíntesis, Facultad de Biología, Universidad de Sevilla-Consejo Superior de Investigaciones Científicas, Apartado 1113, 41080 Seville, Spain

ABSTRACT

The elemental and molecular composition, pigment content, and productivity of a phycoerythrin-rich nitrogen-fixing cyanobacterium—an Anabaena strain isolated from the coastal lagoon Albufera de Valencia, Spain—has been investigated. When compared with other heterocystous species, this strain exhibits similar chlorophyll a, carotene, and total phycobiliprotein contents but differs remarkably in the relative proportion of specific phycobiliproteins; the content of C-phycoerythrin amounts to 8.3% (versus about 1% in the other species) of cell dry weight. Absorption and fluorescence spectra of intact phycobilisomes isolated from this Anabaena sp. corroborate the marked contribution of phycoerythrin as an antenna pigment, a circumstance that is unusual for cyanobacteria capable of fixing N2. The pigment content of cells is affected by variations in irradiance and cell density, these adaptive changes being more patent for C-phycoerythrin than for phycocyanins. The Anabaena strain is clumpy and capable of rapid flocculation. It exhibits outdoor productivities higher than 20 g (dry weight) m–2 day–1 during summer.

FOOTNOTES

* Corresponding author.

Appl Environ Microbiol. 1989 March; 55(3): 758-760
Copyright © 1989, American Society for Microbiology. All Rights Reserved.



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Copyright © 1989 by the American Society for Microbiology. All rights reserved.