Buoyancy regulation in light-limited continuous cultures of Microcystis aeruginosa |
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| Authors: | Kromkamp Jacco; Konopka Allan; Mur Luuc R |
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| Institution: | Laboratory of Microbiology, University of Amsterdam Nieuwe Achtergracht 127, 1018 WS Amsterdam, The Netherlands
1Department of Biological Sciences, Purdue University West Lafayette, IN 47907, USA
2Present address: Department of Botany, University of Bristol Woodland Road, Bristol BS8 1UG, UK |
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| Abstract: | Microcystis aeruginosa was grown in light-limited continuouscultures at different growth rates on light-dark cycles at variousphotopenods. Due to the strength of the gas vesicles the organismwas not able to collapse its gas vesicles by turgor pressure.Below the maximal growth rate, the organism was buoyant dueto its high gas vesicle content. The results suggested thatthe rate of gas vesicle synthesis was not regulated. Upon atransition to high irradiance it took several hours before thecells lost their buoyancy due to polyglucan accumulation. Theresults are interpreted in an ecological context and it is suggestedthat Microcystis is an epilimnetic species due to its buoyancyregulation. |
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