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Species-specific ability of Chlorella strains (Chlorophyceae) to form stable symbioses with Hydra viridis

Erich Kessler, Volker A. R. Huss and Menachem Rahat
Plant Systematics and Evolution
Vol. 160, No. 3/4 (1988), pp. 241-246
Published by: Springer
Stable URL: http://www.jstor.org/stable/23674393
Page Count: 6
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Species-specific ability of Chlorella strains (Chlorophyceae) to form stable symbioses with Hydra viridis
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Abstract

46 strains of Chlorella, identified by physiological and biochemical characters, were examined for their ability to form stable symbioses with aposymbiotic Hydra viridis. It was found to be a species-specific characteristic. Among the 15 taxa studied, only C. saccharophila var. ellipsoidea, C. saccharophila var. saccharophila, C. fusca var. vacuolata, C. kessleri, C. luteoviridis, and C. protothecoides formed stable symbioses with Hydra viridis. Among the 11 known physiological and biochemical characters of these Chlorella species, only acid tolerance seems to be correlated with symbiosis: All symbiotic species are capable of growing at or below pH 4.0.

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