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Journal Article

Factors influencing the allelopathic activity of the planktonic cyanobacterium Trichormus doliolum


Von Elert,  Eric
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Von Elert, E., & Jüttner, F. (1996). Factors influencing the allelopathic activity of the planktonic cyanobacterium Trichormus doliolum. Phycologia, 35(6 Supplement), 68-73.

Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-E2A1-5
An axenic culture of Trichormus doliolum Bharadwaja, Komarek et Anagnostidis (Nostocales, Cyanophyta) showed growth inhibition of several axenic cyanobacteria and chlorophytes. Allelopathic activity was observed in both phosphorus-limited and -replete chemostat cultures. Phosphorus limitation led to a change in the composition of the released organic compounds and to increased allelopathic activity of the exudate. Allelopathic activity of exudates of the phosphorus-limited and -replete chemostat was confined to the same high-performance liquid chromatography fraction, indicating that the allelopathic compounds released may be similar if not identical. The exudates inhibited photosynthetic oxygen production and enhanced chlorophyll fluorescence in other cyanobacteria. Growth-inhibiting effects showed a linear dose dependency, indicating that even small concentrations of allelopathic compounds influenced the growth of other cyanobacteria and algae. A biomass of Trichormus doliolum 20 times less than that needed for growth inhibition led to an increase in chlorophyll fluorescence of other algae. This suggests that, under light-limited growth conditions, target organisms are more susceptible to allelochemical compounds that interfere with the photosynthetic electron transport. Experiments conducted under light-saturated conditions are likely to underestimate the potential of allelopathic interactions