Responses of a Mutant Strain of Chlamydomonas reinhardi to Prolonged Organotrophic Growth

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Abstract
The responses of the mutant strain y-2 of C. reinhardi to prolonged organotrophic growth were examined and compared to those of the wild type strain. While the wild type strain remained green and viable in the dark for periods in excess of 2 weeks, the mutant strain became chlorotic, and exponential death followed loss of 95% of the chlorophyll. Such cultures of y-2 were overgrown by apparent revertants to wild type, suggesting that death of y-2 is not due to accumulation of toxic products of organotrophy. During prolonged organotrophy, triose phosphate dehydrogenase activities varied as a function of chlorophyll content in a manner consistent with earlier studies. The activity of glutamic dehydrogenase was shown to decrease sharply as the material became chlorotic but before the onset of death.

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