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首页> 外文期刊>Canadian Journal of Fisheries and Aquatic Sciences >Latitudinal and vertical distributions of particle-associated dimethylsulfoniopropionate (DMSP) lyase activity in the western North Atlantic Ocean
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Latitudinal and vertical distributions of particle-associated dimethylsulfoniopropionate (DMSP) lyase activity in the western North Atlantic Ocean

机译：北大西洋西部颗粒相关的二甲基磺丙酸二甲酯（DMSP）裂解酶活性的纵横分布

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摘要

Dimethylsulfoniopropionate (DMSP) lyase enzymes cleave phytoplankton-derived DMSP into dimethylsulfide (DMS) and acrylate. We measured particle-associated (>0.7 mum) 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.)mug Chl a(-1)) compared with more productive Gulf of Maine waters (DLA:Chl a = 0.5-7.9 nmol DMS.min(-1.)mug 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.
机译：丙酸二甲酯（DMSP）裂解酶将浮游植物衍生的DMSP裂解为二甲基硫醚（DMS）和丙烯酸酯。我们在从缅因州湾到Sargasso海的不同水域中测量了与颗粒相关的（> 0.7微米）DMSP裂解酶活性（DLA）。 DLA处于相对狭窄的范围内（0.63-5.4 nmol DMS.L（-1。）min（-1）），没有明显的地理趋势。但是，DLA通常在地表附近最高，并在常光区内随深度而降低。当归一化为叶绿素a（Chl a）时，与Sargasso海的贫营养地表水（DLA：Chl a = 33-53 nmol DMS.min（-1。）mug Chl a（-1）相比），DLA显着更高生产力更高的缅因州海湾水（DLA：Chl a = 0.5-7.9 nmol DMS.min（-1。）mug Chl a（-1））。在Sargasso海的光学透明水域中，DLA：Chl a通常在水面附近最高，并随深度降低，其趋势与光保护性颜料二恶黄质类似。当将氨和磷酸盐添加到来自Sargasso海的贫营养水中时，Chla呈指数增长，而DLA：Chla下降83％。我们的结果表明，当浮游生物暴露于高太阳辐射和低养分的情况下，特定的DLA最高，这与DMSP裂解酶可能参与氧化应激保护的想法一致。

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