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  Factors influencing the allelopathic activity of the planktonic cyanobacterium Trichormus doliolum

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

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-E2A1-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-E2A2-3
Genre: Journal Article

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Von Elert, Eric1, Author              
Jüttner, Friedrich, Author
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1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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 Abstract: 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

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Language(s): eng - English
 Dates: 1996-11
 Publication Status: Published in print
 Pages: -
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 Rev. Method: -
 Identifiers: eDoc: 208133
Other: 1604/S 37160
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Title: Phycologia
Source Genre: Journal
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Pages: - Volume / Issue: 35 (6 Supplement) Sequence Number: - Start / End Page: 68 - 73 Identifier: ISSN: 0031-8884