Nitrogen-fixing cyanobacterium with a high phycoerythrin content
|Author/s||Rodríguez Martínez, Herminia
Rivas Florido, Joaquín
García Guerrero, Miguel
Losada Villasante, Manuel
|Department||Universidad de Sevilla. Departamento de Bioquímica Vegetal y Biología Molecular|
|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 ...
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-' during summer.
|Citation||Rodríguez Martínez, H., Rivas Florido, J., García Guerrero, M. y Losada Villasante, M. (1989). Nitrogen-fixing cyanobacterium with a high phycoerythrin content.|