| Abstract: | Demethylation and cleavage of dimethylsulfoniopropionate (DMSP) was measured in three different types of,intertidal marine sediments: a cyanobacterial mat, a diatom-covered tidal flat and a carbonate sediment. Consumption rates of added DMSP were highest in cyanobacterial mat slurries (59 ?? mol DMSP l-1 slurry h-1) and lower in slurries from a diatom mat and a carbonate tidal sediment (24 and 9 ??mol DMSP l-1 h-1, respectively). Dimethyl sulfide (DMS) and 3-mercaptopropionate (MPA) were produced simultaneously during DMSP consumption, indicating that cleavage and demethylation occurred at the same time. Viable counts of DMSP-utilizing bacteria revealed a population of 2 x 107 cells cm-3 sediment (90% of these cleaved DMSP to DMS, 10% demethylated DMSP to MPA) in the cyanobacterial mat, 7 x 105 cells cm-3 in the diatom mat (23% cleavers, 77% demethylators), and 9 x 104 cells cm-3 (20% cleavers and 80% demethylators) in the carbonate sediment. In slurries of the diatom mat, the rate of MPA production from added 3-methiolpropionate (MMPA) was 50% of the rate of MPA formation from DMSP. The presence of a large population of demethylating bacteria and the production of MPA from DMSP suggest that the demethylation pathway, in addition to cleavage, contributes significantly to DMSP consumption in coastal sediments. |
| Genre: | Article |
| ProdID: | 70017654 |
| Citation Author: | Visscher, P. T.; Kiene, R. P.; Taylor, B. F. |
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| Citation End Page: | 189 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | FEMS Microbiology Ecology |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Demethylation and cleavage of dimethylsulfoniopropionate in marine intertidal sediments; 1994; Article; Journal; FEMS Microbiology Ecology; Visscher, P. T.; Kiene, R. P.; Taylor, B. F. |
| Citation Start Page: | 179 |
| Citation Volume: | 14 |
| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | Demethylation and cleavage of dimethylsulfoniopropionate in marine intertidal sediments; 1994; Article; Journal; FEMS Microbiology Ecology; Visscher, P. T.; Kiene, R. P.; Taylor, B. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/0168-6496(94)90095-7 |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
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