Abstract
Allelopathic activity of Chara aspera was determined in agar diffusion assays using planktonic cyanobacteria as target organisms. Growth inhibition of cyanobacterial strains was observed in bioassays inoculated with living Chara aspera shoots as well as with 60% aqueous methanol extracts of Chara aspera. For further analysis, the methanol extract was fractionated into three parts: a lipophilic methanol – a butylmethylether-extract and a hydrophilic methanol extract. The bioassays indicated that major allelopathic activity was retained in the hydrophilic methanol – and the lipophilic butylmethylether-extract. Separation of the extracts by means of high performance liquid chromatography followed by fractionation of the eluant resulted in supplementary nine fractions, three from each part, respectively. Three fractions exhibited a strong growth inhibition of the target organism Anabaena cylindrica Lemmermann. The second and the third fraction of the lipophilic butylmethylether extract indicate the presence of novel allelopathic active compounds with lipophilic characteristics. The results lead to the suggestion that more than two chemical compounds in Chara aspera are responsible for the growth inhibition of cyanobacteria.
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Berger, J., Schagerl, M. Allelopathic activity of Chara aspera . Hydrobiologia 501, 109–115 (2003). https://doi.org/10.1023/A:1026263504260
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DOI: https://doi.org/10.1023/A:1026263504260