Saturated uptake kinetics: transient response of the marine diatom Thalassiosira pseudonana to ammonium,nitrate, silicate or phosphate starvation |
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Authors: | J S Parslow P J Harrison P A Thompson |
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Institution: | (1) Department of Oceanography, University of British Columbia, V6T 2B1 Vancouver, British Columbia, Canada;(2) Department of Oceanography and Botany, University of British Columbia, V6T 2B1 Vancouver, British Columbia, Canada |
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Abstract: | Changes in the saturated uptake kinetics of the limiting nutrient were followed as Thalassiosira pseudonana (Clone 3 H) batch cultures entered ammonium, nitrate, silicate and phosphate starvation. Cultures starved of ammonium or phosphate developed very high specific uptake capacities over a 24 to 48 h starvation period, due to both decreases in cell quota and increases in uptake rates per cell. In particular, the cell phosphorus quota decreased ca. 8-fold during phosphate starvation and specific uptake rates exceeded 100 d-1. In contrast, cultures entering nitrate or silicate starvation underwent little or no further cell division, and the uptake capacity declined during starvation. After 24 to 48 h starvation, an induction requirement for uptake of nitrate or silicate was apparent. These responses are consistent with adaptation to the pattern of supply of these nutrients in the field. |
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