Production of glycine betaine and dimethylsulfoniopropionate in marine phytoplankton. II. N-limited chemostat cultures

The nitrogenous organic osmolyte glycine betaine (GBT) and its sulfur analog dimethylsulfoniopropionate (DMSP) are quantitatively significant solutes in many marine algae. Although an inverse relationship has been suggested between these two compounds in marine phytoplankton that may be regulated by nitrogen availability, our results in Part I of this work (same issue) showed no such relationship in batch cultures of six species.