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Aquatic Sciences

, Volume 52, Issue 4, pp 345–359 | Cite as

The effect of light on the release of organic compounds by the cyanobacteriumOscillatoria rubescens

  • M. Feuillade
  • J. Feuillade
  • V. Fiala
Article

Abstract

The effect of light intensity on the release of dissolved organic carbon during photosynthesis on NaH14CO3 was investigated using the phytoplanktonic CyanobacteriumOscillatoria rubescens. The released products were fractionated by molecular size and chemical identifications attempted using combined thin-layer electrophoresis and chromatography, and high pressure liquid chromatography.

Within the range of irradiances tested (from 6 to 60 µmole m−2 sec−1), though the upper one inhibited photosynthesis ofO. rubescens, light had little effect on the quantity and composition of the excreted products. The released carbon was always lower than 3% of the incorporated carbon, and mainly composed (62 to 86%) by small molecular weight compounds. The prevailing identified compounds were amino acids which represented more than 20% of the excreted carbon. Among organic acids, glycolic acid accounted for less than 2% of the recovered radioactivity. Glucose was the only identified sugar.

Key words

Excretion cyanobacteria oscillatoria 

Abbreviations

EOC

excreted organic carbon

DOC

dissolved organic carbon

PER

percent extracellular release

LMW

low molecular weight

HMW

high molecular weight

AA

amino acids

µmoles

m−2 sec−1 = µEinsteins m−2 sec−1

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Copyright information

© Birkhäuser Verlag 1990

Authors and Affiliations

  • M. Feuillade
    • 1
  • J. Feuillade
    • 1
  • V. Fiala
    • 2
  1. 1.Station d'Hydrobiologie lacustre — I.N.R.A.Cédex — THONON-les-BAINSFrance
  2. 2.Laboratoire du Métabolisme et de la nutrition des Plantes — I.N.R.A.Cédex — VersaillesFrance

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