Abstract
Changes in respiratory and photosynthetic rates were correlated with previous research on resting cell cytology and cytochemistry. Resting cells possess a contracted mass of granular cytoplasm within an unmodified frustule. Although the respiration rate of resting cells is less than 20% of that in light‐grown cells, cytochrome oxidase activity is reduced to about 80%. Therefore, respiratory rate decline cannot be attributed to a decrease in available cytochrome oxidase. Photosynthesis rapidly declines during the first week of resting cell formation. The survival value of these mechanisms is discussed.
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