Folia Microbiologica

, Volume 46, Issue 6, pp 549–554 | Cite as

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

  • R. A. DanilovEmail author
  • N. G. A. Ekelund


The influence of pH 3–10 on the growth, motility and photosynthesis inEuglena 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 patterns 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.


Photon Flux Density Oxygen Evolution Photosynthetic Efficiency Slope Coefficient Compensation Point 
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Copyright information

© Folia Microbiologica 2001

Authors and Affiliations

  1. 1.Department of Natural and Environmental SciencesMid Sweden UniversityHärnösandSweden

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