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- 저자 : Paula Salgado (검색결과 1 건)
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Salinity as a Regulator of DMSP Degradation in Ruegeria pomeroyi DSS-3
Paula Salgado,Ronald Kiene,William Wiebe,Catarina Magalhães 한국미생물학회 2014 The journal of microbiology Vol.52 No.11
Dimethylsulfoniopropionate (DMSP) is an important carbonand sulfur source to marine bacterial communities andthe main precursor of dimethylsulfide (DMS), a gas that influencesatmospheric chemistry and potentially the globalclimate. In nature, bacterial DMSP catabolism can yield differentproportions of DMS and methanethiol (MeSH), butrelatively little is known about the factors controlling thepathways of bacterial degradation that select between theirformation (cleavage vs. demethiolation). In this study, wecarried out experiments to evaluate the influence of salinityon the routes of DMSP catabolism in Ruegeria pomeroyiDSS-3. We monitored DMS and MeSH accumulation in cellsuspensions grown in a range of salinities (10, 20, 30 ppt)and with different DMSP amendments (0, 50, 500 μM). Significantly higher concentrations of DMS accumulated inlow salinity treatments (10 ppt; P < 0.001), in both MarineBasal Medium (MBM) and half-strength Yeast Tryptone SeaSalts (½ YTSS) media. Results showed a 47.1% and 87.5%decrease of DMS accumulation, from salinity 10 to 20 ppt,in MBM and ½ YTSS media, respectively. On the otherhand, MeSH showed enhanced accumulations at highersalinities (20, 30 ppt), with a 90.6% increase of MeSH accumulationfrom the 20 ppt to the 30 ppt salinity treatments. Our results with R. pomeroyi DSS-3 in culture are in agreementwith previous results from estuarine sediments anddemonstrate that salinity can modulate selection of the DMSPenzymatic degradation routes, with a consequent potentialimpact on DMS and MeSH liberation into the atmosphere.
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