Abstract
Eighteen isolates of Chlorococcum were incubated under defined culture conditions for 6-7 weeks. At that time, isolates were separated into green, yellow-green, orange, or red color groups according to the color of the cultures. Total chlorophyll, carotenoid concentration, and percentage of carotenoids in relation to total pigment content were measured for each species. Individual carotenoids of each isolate were identified and quantified. Each color group had pigment characteristics which were distinctive. Other studies on Chlorococcum are discussed in relation to this work. It is proposed that pigmentation of old cultures be used as the first criterion for distinguishing species of Chlorococcum.
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