Expression of death-related genes and reactive oxygen species production in Skeletonema tropicum upon exposure to the polyunsaturated aldehyde octadienal

  • Alessandra A. Gallina Colorado State University, United States.
  • Chih-Ching Chung National Taiwan Ocean University, Taiwan, Province of China.
  • Raffaella Casotti | raffaella.casotti@szn.it Stazione Zologica A. Dohrn, Italy.

Abstract

The effects of 4E/Z-octadienal (OCTA) on ScDSP-1 and ScDSP-2 gene expression and reactive oxygen species (ROS) production were investigated in the marine diatom Skeletonema tropicum (formerly costatum) using qRTPCR and flow cytometry. ScDSP-1 and ScDSP-2 genes have been previously shown to be involved in cell death in ageing cells and in response to photosynthetic stress. OCTA induced a differential, concentration-dependent DSP gene expression associated to ROS production, 821.6 and 97.7 folds higher for ScDSP-1 and ScDSP-2, respectively. Among the concentrations tested, only 8 μM OCTA, which caused a reduction of 50% in cell concentrations at 24 h, was able to elicit an expression pattern consistent with a signalling role. Interestingly, only intermediate levels of reactive oxygen species (ROS) (i.e., 1.5±0.1 increase) were observed to be elicited by such concentration. These results suggest that ROS are key components of the molecular cascade triggered by polyunsaturated aldehydes (PUA) and leading to cell death. This could have implications for bloom final stages at sea, where PUA may act as effectors of diatom population dynamics through ROS acting as modulators.

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Author Biographies

Alessandra A. Gallina, Colorado State University
Department of Biology
Chih-Ching Chung, National Taiwan Ocean University
Institute of Marine Environmental Chemistry and Ecology
Raffaella Casotti, Stazione Zologica A. Dohrn
Integrative Marine Ecology
Published
2015-11-16
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Articles
Supporting Agencies
National Science Council of Taiwan (NSC), SZN PhD Program, Taiwan National Science Council
Keywords:
Diatom, chemical ecology, bloom evolution, Programmed cell death, ROS.
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How to Cite
Gallina, A., Chung, C.-C., & Casotti, R. (2015). Expression of death-related genes and reactive oxygen species production in Skeletonema tropicum upon exposure to the polyunsaturated aldehyde octadienal. Advances in Oceanography and Limnology, 6(1/2). https://doi.org/10.4081/aiol.2015.5466