Influence of salinity and nitrogen content on production of dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) by Skeletonema costatum |
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Authors: | Guipeng Yang Chengxuan Li Juan Sun |
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Institution: | 1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China 2. Research Center for Marine Ecology, The First Institute of Oceanography, SOA, Qingdao, 266061, China
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Abstract: | The effects of changing salinity and nitrogen limitation on dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) concentrations
were investigated in batch cultures of coastal diatom Skeletonema costatum, an ecologically important species. Changes in salinity from 20–32 caused no measurable variation in cell growth or culture
yield, but increased intracellular DMSP per cell by 30%. Nitrogen limitation caused up to a two-fold increase in total DMSP
per cell and up to a three-fold increase in DMS per cell. These changes in DMSP and DMS per cell in the Skeletonema costatum cultures with nitrogen limitation and changing salinity were primarily attributed to the physiological functions of DMSP
as an osmolyte and an antioxidant. The data obtained in this study indicated that nitrogen limitation and salinity may play
an important role in climate feedback mechanisms involving biologically derived DMS. |
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