Effects of nutrient limitation on toxin production and composition in the marine dinoflagellate Protogonyaulax tamarensis |
| |
| Authors: | G L Boyer J J Sullivan R J Andersen P J Harrison F J R Taylor |
| |
| Institution: | (1) Department of Oceanography, University of British Columbia, V6T 1W5 Vancouver, British Columbia, Canada;(2) Department of Health and Human Services, Public Health Service, Food and Drug Administration, Seafood Products Research Center, 98174 Seattle, Washington, USA;(3) Department of Chemistry, University of British Columbia, V6T 1W5 Vancouver, British Columbia, Canada;(4) Department of Botany, University of British Columbia, V6T 1W5 Vancouver, British Columbia, Canada;(5) Present address: Department of Chemistry, College of Environmental Science and Forestry, State University of New York, 13210 Syracuse, New York, USA |
| |
| Abstract: | Toxin production was measured by high pressure liquid chromatography (HPLC) when the marine dinoflagellate Protogonyaulax tamarensis (NEPCC 255) was grown under nitrogen or phosphorus limitation. The major toxins found in P. tamarensis (255) consisted of (N21-SO
3
-
)STX (11%), (N21-SO
3
-
)NeoSTX (44%), and (N21-SO
3
-
)GTX2 plus (N21-SO
3
-
)GTX3] (20%). Total toxin content on a per cell basis was high for cultures in log phase (30 to 40 fmol cell-1) and then decreased to ca 20 fmol cell-1 as the cultures entered stationary phase. There was a gradual decrease in the toxin content per cell during nitrogen-limited stationary phase to ca 3 fmol cell-1 or less. Phosphorus-limited cultures showed a markedly different response than nitrogen-limited cultures. Toxin content in P-limited cells dramatically increased at the start of stationary phase, reaching levels 3 to 4 times that observed in control and nitrogen-limited cultures. These results cannot be explained by changes in the average cell volume. Eventhough dramatic effects on the total toxin concentration were observed in response to nutrient limitation (N or P), the toxin composition (on a percent basis) remained constant. This suggests that the individual toxin composition of a given isolate is a fixed genetic trait and not a transient response to changing environmental factors. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
