Abstract
The chloropigment composition of the diatom Phaeodactylum tricornutum (Bohlin) was studied using HPLC in batch and turbidostat cultures. Four chloropigments were observed: Chl a, c, chlorophyllide a, and Chl a allomer. The cellular concentration of these pigments generally decreased from exponential growth to stationary phase in batch cultures and as the cells became more N-limited in the turbidostat cultures. Chlorophyllide a did not show any distinct pattern in these experiments. Two pigment indicators used in other studies as a sign of deteriorating physiological condition: increasing Chl c: a ratio and the presence of Chl a-like derivatives were here associated with young strongly growing cultures. Increasing stress, in terms of culture age or nutrient limitation, brought about a rearrangement in the relative proportions of the various pigments. Results are interpreted as reflecting variations with culture age or N availability in the turnover rates of the different pigments.
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