Effect of growth rate on unicell production in two strains of Scenedesmus (Chlorophyta)

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Abstract
Two strains of Scenedesmus were examined in laboratory culture in a variety of growth conditions in an attempt to stimulate unicell production. The UTEX strain 614 did not form unicells at any time, even though others have recently implicated growth rate as a factor involved in unicell production. Scenedesmus strain 170, a known unicell producing organism, develops a unicellular stage in response to available ammonium and internal carbohydrate level. At constant growth rate, from approximately 5 to 100% unicells were produced by varying the nutrient base. Many spine-bearing members of this genus develop the unicell stage. At present a nutritional demand appears to be the common factor in triggering unicell production, but not growth rate.

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