Production of DMS and DMSP in different physiological stages and salinity conditions in two marine algae |
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| Authors: | Guangchao Zhuang Guipeng Yang Juan Yu Yuan Gao |
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| Institution: | 1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China
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| Abstract: | Dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) production by Scrippsiella trochoidea and Prorocentrum minimum was investigated to characterize the effects of physiological stage and salinity on DMS and DMSP pools of these two marine
phytoplankton species. Axenic laboratory cultures of the two marine algae were tested for DMSP production and its conversion
into DMS. The results demonstrated that both algal species could produce DMS, but the average concentration of DMS per cell
in S. trochoidea (12.63 fmol/L) was about six times that in P. minimum (2.01 fmol/L). DMS and DMSP concentrations in algal cultures varied significantly at different growth stages, with high release
during the late stationary growth phase and the senescent phase. DMS production induced by three salinities (22, 28, 34) showed
that the DMS concentrations per cell in the two algal cultures increased with increasing salinity, which might result from
intra-cellular DMSP up-regulation with the change of osmotic stress. Our study specifies the distinctive contributions of
different physiological stages of marine phytoplankton on DMSP and DMS production, and clarifies the influence of salinity
conditions on the release of DMS and DMSP. As S. trochoidea and P. minimum are harmful algal bloom species with high DMS production, they might play an additional significant role in the sulfur cycle
when a red tide occurs. |
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