Saturated uptake kinetics: transient response of the marine diatomThalassiosira pseudonanato ammonium, nitrate, silicate or phosphate starvation
✍ Scribed by J. S. Parslow; P. J. Harrison; P. A. Thompson
- Book ID
- 104753432
- Publisher
- Springer-Verlag
- Year
- 1984
- Tongue
- English
- Weight
- 952 KB
- Volume
- 83
- Category
- Article
- ISSN
- 0025-3162
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✦ Synopsis
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 100d -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.