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Extracellular carbohydrate liberation in the flagellates Isochrysis galbana and Prymnesium parvum

Published online by Cambridge University Press:  11 May 2009

A. F. H. Marker
A. F. H. Marker
Affiliation:
Department of Botany, Westfield College, University of London
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Extract

The production of extracellular carbohydrate has been studied in Isochrysis galbana and Prymnesium parvum in axenic culture. Increased extracellular production of carbohydrate occurred at reduced and increased salinity, low light intensity and under conditions of nitrogen starvation in Isochrysis, and in some cases appeared to be associated with the sedimentation of the cells from stagnant culture. Extracellular carbohydrate production was found to be greatest during the early and later stages in growth and dropped to a minimum during the mid-growth phase. Experiments indicated that the cells were not being damaged during harvesting of the cultures. A close similarity was found between the monosaccharide components of the intra- and extracellular carbohydrate after acid hydrolysis; both contained glucose, galactose, arabinose, xylose and ribose. It is suggested that the production of most of the extracellular carbohydrate is due to the passive release of organic matter from dead or dying cells.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 45 , Issue 3 , October 1965 , pp. 755 - 772
Copyright
Copyright © Marine Biological Association of the United Kingdom 1965

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