Abstract
The cell cycle marker event of DNA replication in eucaryotic algae was identified using 3H-Thymidine (3H-TdR) incorporation. The frequency of cells (F) within a population undergoing DNA replication was estimated and the cell division rate (μF) calculated. In laboratory cultures the rates of cell division calculated from changes in cell numbers (μN) and μF were similar. Dual labelling with 3H-TdR and NaH14CO3 enabled rates of cell division and photosynthesis to be coincidently measured for individual species of algae. Using these single species radioisotope techniques, several distinct photosynthesis irradiance and cell division irradiance relationships were found for: (1) different species of phytoplankton isolated from the same sample, and (2) the same species isolated from different environments. These techniques allow the coupling between photosynthesis and cell division to be examined with high resolution for algae in situ.
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