Evolution and Symbiosis in the Genus Chlorella and Related Algae

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Abstract
The ability of 26 strains of free-living Chlorella and related algae to infect aposymbiotic stocks of Paramecium bursaria, syngen 1, was investigated. About half the strains studied were found to possess some infectivity. The ability of a few strains of algae to reproduce inside the host and their ability to enhance the growth or survival of the host under conditions of starvation were examined. On the basis of these data and others from the literature, we suggest that the genus Chlorella possesses a marked preadaptation for symbiotic associations.

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