Journal article

Effects of pH on the growth rate, motility and photosynthesis in Euglena gracilis


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Publication Details

Author list: Danilov, Roman;Ekelund, Nils

Publication year: 2001

Start page: 549

End page: 554

Number of pages: 6

ISSN: 0015-5632


View additional information: View in Web of Science


The influence of pH 3-10 on the growth, motility and photosynthesis in Euglena gracilis was demonstrated during a 7-d cultivation. The cells did not survive at pH <4 and >8, highest growth rate being detected at pH 7. Motility followed a similar pattern as growth rate. Photosynthetic response curves were shown to be of the same type over the whole pH range. High respiration was characteristic for cells grown at pH 5 and 6, the lowest one at 7. At high and also at low pH more active respiration was found which can be considered as a protective response on proton stress. Respiration was not completely inhibited with potassium cyanide. Photosynthesis was the most effective at pH 6; lower and higher pH decreased photosynthetic efficiency. pH affected more the growth rate than the photosynthesis.


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