Ontology type: schema:ScholarlyArticle
2002-07
AUTHORSW. Sunda, D. J. Kieber, R. P. Kiene, S. Huntsman
ABSTRACTThe algal osmolyte dimethylsulphoniopropionate (DMSP) and its enzymatic cleavage product dimethylsulphide (DMS) contribute significantly to the global sulphur cycle1,2,3, yet their physiological functions are uncertain4. Here we report results that, together with those in the literature5,6, show that DMSP and its breakdown products (DMS, acrylate, dimethylsulphoxide, and methane sulphinic acid) readily scavenge hydroxyl radicals and other reactive oxygen species, and thus may serve as an antioxidant system, regulated in part by enzymatic cleavage of DMSP. In support of this hypothesis, we found that oxidative stressors, solar ultraviolet radiation7, CO2 limitation8, Fe limitation, high Cu2+ (ref. 9) and H2O2 substantially increased cellular DMSP and/or its lysis to DMS in marine algal cultures. Our results indicate direct links between such stressors and the dynamics of DMSP and DMS in marine phytoplankton, which probably influence the production of DMS and its release to the atmosphere. As oxidation of DMS to sulphuric acid in the atmosphere provides a major source of sulphate aerosols and cloud condensation nuclei3, oxidative stressors—including solar radiation and Fe limitation—may be involved in complex ocean–atmosphere feedback loops that influence global climate and hydrological cycles1,2. More... »
PAGES317-320
http://scigraph.springernature.com/pub.10.1038/nature00851
DOIhttp://dx.doi.org/10.1038/nature00851
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