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JPR Advance Access published online on August 13, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn085
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Growth phase specific release of polyunsaturated aldehydes by the diatom Skeletonema marinoi

Charles Vidoudez and Georg Pohnert*

Institut für Anorganische und Analytische Chemie, Lehrstuhl für Instrumentelle Analytik / Bioorganische Analytik, Friedrich-Schiller-Universität, Lessingstr. 8, D-07743 Jena, Germany

* corresponding author: Georg.Pohnert{at}uni-jena.de

Received on April 3, 2008; revised on August 11, 2008; accepted on August 12, 2008


  Abstract

Polyunsaturated aldehydes (PUA) have been extensively studied for their potential role in phytoplankton defence against grazers, but recently a potential infochemical role has been identified as well. We present here first evidence of a synchronised release of polyunsaturated aldehydes from intact cells of a culture of the diatom Skeletonema marinoi. The release occurs transiently before the culture changes to the decline phase, providing a time limited potential signal. When cultures are exposed during different stages of growth to polyunsaturated aldehydes in concentrations found in the medium no general responses were found. However, a weak effect on cell concentration is observed exclusively when cultures in the late stationary phase are challenged with polyunsaturated aldehydes. Our results support for the first time the experimentally postulated hypothesis that PUA can play a role as infochemicals in mediating plankton interactions.

Key Words: allelopathic interactions • infochemicals • chemical defense • plankton • chemical ecology

Communicating Editor: Dr Roger Harris


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