Effect of Exogenous Glucose on Photosynthesis in the Diatom Thalassiosira weissflogii Depending on Nitrate Nitrogen Supply and Illumination

  • I. G. Radchenko
  • L. V. Il'yash
  • V. D. Fedorov


The rate of photosynthetic carbon fixation (P) in the diatom Thalassiosira weissflogii cultivated in the presence of exogenous glucose in the medium (0–10.56 μg C/l) at different levels of illumination—25, 50, and 100 μE/(m2 s)—was studied as a function of nitrate nitrogen supply. In the diatoms limited in nitrogen and assimilating exogenous glucose, P was found to decrease or increase depending on the light intensity, glucose concentration, and the duration of exposure. In the diatoms assimilating both nitrate nitrogen and glucose, compared to those supplied with nitrates alone, P was higher at the medium and high light intensities and lower at the low light intensity. The interrelation of the processes of carbon and nitrogen metabolism in mixotrophic algae and the ecological role of glucose uptake by phytoplankton are discussed.


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Copyright information

© MAIK “Nauka/Interperiodica” 2004

Authors and Affiliations

  • I. G. Radchenko
    • 1
  • L. V. Il'yash
    • 1
  • V. D. Fedorov
    • 1
  1. 1.Biological FacultyMoscow State University, Vorob'evy goryMoscowRussia

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