Affiliation:
1. Department of Biology and The Institutes for Applied Research, P.O. Box 1025, 3 Ben-Gurion University of the Negev, Beer-Sheva, and Israel Oceanographic and Limnologic Research Ltd., Elat, 2 Israel
Abstract
Contamination of algae cultivated outdoors by various microorganisms, such as bacteria, fungi, algae, and protozoa, can affect growth and product quality, sometimes causing fast collapse of the cultures. The main contaminant of
Porphyridium
cultures grown outdoors in Israel is a
Gymnodinium
sp., a dinoflagellate that feeds on the alga. Comparison of the effects of various environmental conditions, i.e., pH, salinity, and temperature, on
Gymnodinium
and
Porphyridium
species revealed that the
Gymnodinium
sp. has sharp optimum curves, whereas the
Porphyridium
sp. has a wider range of optimum conditions and is also more resistant to extreme environmental variables. The mode of preying on the alga was observed, and the specificity of the
Gymnodinium
sp. for the
Porphyridium
sp. was shown. In addition,
Gymnodinium
extract was shown to contain enzymatic degrading activity specific to the
Porphyridium
sp. cell wall polysaccharide.
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
Reference17 articles.
1. Effect of nitrate on growth and production of cell wall polysaccharide by the unicellular red alga Porphyridium;Adda M.;Biomass,1986
2. Arad S. (Malis). 1988. Production of sulfated polysaccharides from unicellular red algae p. 65-87. In T. Stadler J. Mollion M.-C. Verdas Y. Karamanos H. Morvan and D. Christiaen (ed.) Algal biotechnology. Elsevier Science Publishing Inc. New York.
3. Ben-Amotz A. 1988. The production of p-carotene by the alga Dunaliella: a new venture in biotechnology p. 4-7. In J. Ramus and M. C. Jones (ed.) Polysaccharides from microalgae: a new agroindustry. Duke University Marine Laboratory Beaufort N.C.
4. The importance of protozoa in controlling the abundance of planktonic algae in lakes;Canter H. M.;Proc. Linn. Soc. London,1968
5. Nutritional investigation of phagotrophic protozoa under axenic conditions;Droop M. R.;Helgolander Wiss. Meeresunters.,1970
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