Journal
PHYCOLOGICAL RESEARCH
Volume 58, Issue 3, Pages 188-201Publisher
WILEY
DOI: 10.1111/j.1440-1835.2010.00579.x
Keywords
Chlorella variabilis; ITS2; Micractinium reisseri; Paramecium bursaria; species concept
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P>Symbiotic algae of the ciliate Paramecium bursaria (Ehrenberg) Focker are key species in the fields of virology and molecular evolutionary biology as well as in the biology of symbiotic relationships. These symbiotic algae were once identified as Zoochlorella conductrix Brandt by the Dutch microbiologist, Beijerinck 120 years ago. However, after many twists and turns, the algae are today treated as nameless organisms. Recent molecular analyses have revealed several different algal partners depending on P. bursaria strains, but nearly all P. bursaria contains a symbiont belonging to either the so-called 'American' or 'European' group. The absence of proper names for these algae is beginning to provoke ill effects in the above-mentioned study areas. In the present study, we confirmed the genetic autonomy of the 'American' and 'European' groups and described the symbionts as Chlorella variabilis Shihira et Krauss and Micractinium reisseri Hoshina, Iwataki et Imamura sp. nov., respectively (Chlorellaceae, Trebouxiophyceae).
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