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Latitudinal and vertical distributions of particle-associated dimethylsulfoniopropionate (DMSP) lyase activity in the western North Atlantic Ocean

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Dimethylsulfoniopropionate (DMSP) lyase enzymes cleave phytoplankton-derived DMSP into dimethylsulfide (DMS) and acrylate. We measured particle-associated (>0.7 µm) DMSP lyase activity (DLA) in diverse waters from the Gulf of Maine to the Sargasso Sea. DLA fell within a relatively narrow range (0.63–5.4 nmol DMS·L–1·min–1), with no significant geographic trend. DLA was, however, generally highest near the surface and decreased with depth within the euphotic zone. When normalized to chlorophyll a (Chl a), DLA was significantly higher in oligotrophic surface waters of the Sargasso Sea (DLA:Chl a = 33–53 nmol DMS·min–1·µg Chl a–1) compared with more productive Gulf of Maine waters (DLA:Chl a = 0.5–7.9 nmol DMS·min–1·µg Chl a–1). In optically clear waters of the Sargasso Sea, DLA:Chl a was generally highest near the surface and decreased with depth, following a similar trend to that of the photoprotective pigment diadinoxanthin. When ammonium and phosphate were added to oligotrophic water from the Sargasso Sea, Chl a increased exponentially, whereas DLA:Chl a decreased by 83%. Our results suggest that Chl a specific DLA is highest when plankton are exposed to high solar radiation and low nutrients, consistent with the idea that DMSP lyases may be involved in oxidative stress protection.

Les DMSP lyases sont des enzymes qui scindent le diméthylsulfoniopropionate (DMSP) provenant du phytoplancton en sulfure de diméthyle (DMS) et en acrylate. Nous avons mesuré l'activité de la DMSP lyase (DLA) associée aux particules (>0,7 µm) dans diverses eaux depuis le golfe du Maine jusqu'à la mer des Sargasses. Les valeurs de DLA se situent dans une gamme relativement étroite (0,63–5,4 nmol DMS·L–1·min–1), sans tendance géographique marquée. Cependant, la DLA est généralement plus grande près de la surface et elle décroît avec la profondeur dans la zone euphotique. Une fois la normalisation faite en fonction de la Chl a, la DLA est significativement plus élevée dans les eaux de surface oligotrophes de la mer des Sargasses (DLA:Chl a 33–53 nmol DMS·min–1·µg Chl a–1) que dans celles plus productives du golfe du Maine (DLA:Chl a 0,5–7,9 nmol DMS·min–1·µg Chl a–1). Dans les eaux optiquement claires de la mer des Sargasses, le rapport DLA:Chl a est généralement maximal près de la surface pour ensuite décroître en fonction de la profondeur, une répartition parallèle à celle de la diadinoxanthine, un pigment photoprotecteur. L'addition d'ammonium et de phosphate aux eaux oligotrophes de la mer des Sargasses entraîne une augmentation exponentielle de Chl a, mais un baisse de 83 % du rapport DLA:Chl a. Nos résultats indiquent que la DLA spécifique à la chlorophylle est maximale lorsque le plancton est exposé à une forte radiation solaire et à des concentrations faibles de nutriments, ce qui s'accorde avec le fait que les DMSP lyases sont peut-être impliquées dans la protection contre le stress oxydatif.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: May 1, 2004

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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