THE COURSE OF RESPIRATION DURING THE LIFE CYCLE OF CHLORELLA CELLS

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Abstract
The respiratory activity of Chlorella pyrenoidosa, strain 7-11-05, as influenced by the age of the cells, was studied with Warburg technique. Cells were synchronized in their development by an intermittent, 9 hours'' light: 15 hours'' dark, regimen. The lowest respiration was observed for small daughter cells just liberated from the mother cell wall. In the course of autotrophic growth the respiration increases rapidly, reaches a maximum, and then undergoes a slow decline. The possible correlation of the cycles of respiratory activity with developmental processes and the dependence of changes in the respiration rate on the level of respiratory substrate in the cells and on the direct light activation of respiratory enzymes are discussed.

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