Rates of NH4+ uptake, intracellular transformation and dissolved organic nitrogen release in two clones of marine Synechococcus spp
Open Access
- 1 July 1999
- journal article
- Published by Oxford University Press (OUP) in Journal of Plankton Research
- Vol. 21 (7) , 1337-1353
- https://doi.org/10.1093/plankt/21.7.1337
Abstract
Evidence suggests that phytoplankton can release significant amounts of dissolved organic carbon (DOC), particularly when they are nitrogen (N) deficient. To investigate this phenomenon from the perspective of dissolved organic N (DON), 15N tracer techniques were used to trace the flow of N through two clones ofSynechococcus, WH7803 and WH8018, which were grown in batch culture under N-sufficient and N-deficient conditions. At various stages during the experiment, a subsample of the culture was removed and the response to a pulse of 15N-labeled NH4+ was measured with respect to rates of NH4+ uptake, intracellular NH4+ transformation, and release of total and low-molecular-weight (LMW; + was depleted in the medium.Keywords
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