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Growth and the production of extracellular substances by two strains of Phaeocystis poucheti
Guillard, R.R.L.; Hellebust, J.A. (1971). Growth and the production of extracellular substances by two strains of Phaeocystis poucheti. J. Phycol. 7(4): 330-338
In: Journal of Phycology. Blackwell Science: New York. ISSN 0022-3646, more
Peer reviewed article  

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  • Guillard, R.R.L.
  • Hellebust, J.A.

    Clones of Phaeocystis were isolated from winter surface waters off Woods Hole, Massachusetts, and from the tropical Atlantic near Surinam, South America. Northern strs survived only up to 14('C, while the tropical str survived only as low as 17('C. Colony shapes of the northern and tropical clones differed somewhat, but the motile and nonmotile single cells of both strs seemed identical in the light microscope. By current taxonomic criteria both strs belong to the sp P.poucheti (Hariot) Lagerheim. When growing in the form of colonies, both strs excreted 16-64% of their photoassimilated carbon into the medium, mainly as carbohydrates of varying mol wts. However, cultures predominantly in the form of single cells released only similar to 3% of their photoassimilated carbon. The qualitative composition of the carbohydrates released is similar for the 2 strs, consisting of some 8 sugars or sugar derivatives with glucose, mannose, and rhamnose as the dominant components. The production of acrylic acid was confirmed. We estimate that as much as 7 (k g/l of acrylic acid, and at least 0.3 mg/l of polysaccharides can be liberated in a Phaeocystis bloom.

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