Growth, proteins and chlorophyll in Euglena adapted to various C/N balances
1990
Regnault, A. | Piton, F. | Calvayrac, R.
Photoorganotrophic Euglena were adapted to 33 mM lactate, and either to starvation or ammonium enrichment three years earlier. Carbon/nitrogen (C/N) balance had very little effect on cellular protein contents. Growth was not involved in the adaptation to ammonium enrichment but early cessation of cellular divisions was determined by ammonium starvation. Euglena reacted to C/N balance variations by modulation of chlorophyll content. In the first day of growth, chlorophyll biosynthesis was more rapid, as the chlorophyll content of the cells was low, even if the C/N ratio was high. The value of the C/N balance for which cellular chlorophyll contents diminished was an indication of the adaptation to nutritional conditions. When ammonium disappeared, lactate persistence caused a degradation of chlorophyll, the greater the concentration of the carbon source, the faster the degradation.
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