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JPR Advance Access originally published online on August 13, 2008
Journal of Plankton Research 2008 30(11):1305-1313; 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; accepted on August 12, 2008


  Abstract

Polyunsaturated aldehydes (PUAs) 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 the first evidence of a synchronized release of PUAs 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 PUAs 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 PUAs. Our results support for the first time the experimentally postulated hypothesis that PUA can play a role as infochemicals in mediating plankton interactions.

Corresponding editor: Roger Harris


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