Abstract

Abstract Flow cytometry has been applied to the study of phytoplankton populations and cell components. In this work, cells cycle studies on three marine diatoms cultures were carried out by a flow cytometer. Phaeodactylum tricomutum, Chaetoceros simplex and Thalassiosira allenii, showed different DNA patterns in G1, G2, S, phases. This situation may be related to the specific algal physiology. Cultures of P. tricomutum were maintained in 4 media with different silicates concentrations. The lack of silicates did not seem produced a significative cells arresting in the cell cycle phases. During the experiment, the cell fraction in S phase, decreased in all media tested. These preliminary results could be further developed to apply flow cytometry to environmental problems in order to identify general algal groups and study algal physiology in different growth conditions.

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