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  • Title: Physiological and biochemical contributions to the taxonomy of the genus Chlorella. XI. DNA hybridization.
    Author: Kerfin W, Kessler E.
    Journal: Arch Microbiol; 1978 Jan 23; 116(1):97-103. PubMed ID: 623499.
    Abstract:
    1. DNA homology was studied in 12 Chlorella species. The DNA of 88 strains was hybridized with 3H-labelled DNA from C. fusca var. vacuolata 211-8 b and from C. vulgaris 211-8m. The results indicate that the genus Chlorella is a heterogenous taxon which consists of several groups of species. 2. The "C. fusca group" comprises C. fusca var. vacuolata, C. fusca var. rubescens, and C. zofingiensis. Within this group, C. zofingiensis appears to be more closely related to C. fusca var. vacuolata than is C. fusca var. rubescens. C. fusca var. fusca does not belong to this group of taxa. 3. The "C. vulgaris group" consists of C. vulgaris, C. sorokiniana, and C. saccharophila. There are several strains which seem to assume a position intermediate between C. vulgaris and C. saccharophila. C. protothecoides is not related to this group of species. 4. Several groups of strains of C. sorokiniana with different base compositions (guanine + cytosine content) of their DNA appear to belong to the same taxon. 5. In addition to C. fusca var. fusca and C. protothecoides, also C. luteoviridis, C. minutissima, C. kessleri, and C. homosphaera seem to have so little relationship with the other species that their assignment to the genus Chlorella appears questionable.
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