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The preceding paper (2) has described some of the changes that occur in the photosynthetic activity of the mutant strain y-2 of the unicellular green alga Chlamydomonas reinhardi accompanying changes in chlorophyll content. These results indicated that photosynthetic activity might be regulated by a mechanism which is related to either a critical chlorophyll content or structural configuration within the chloroplast. In this paper, the postulated regulatory mechanism will be given further consideration by studying the effects of chloramphenicol on chlorophyll synthesis, protein synthesis, and photosynthetic 02 evolution. Electron micrographs of cells of regreening cultures were prepared to determine the relationship between the rate of photosynthesis and the structural configuration of the chloroplast.

The Relation of Oxygen Evolution to Chlorophyll and Protein Synthesis in a Mutant Strain of Chlamydomonas reinhardi