Abstract
The acute toxicities of the fungal phytotoxins (8R,16R)-(-)-pyrenophorin and (5S,8R,13S,16R)-(-)-pyrenophorol on Vibrio fischeri, Oscillatoria perornata, Pseudokirchneriella subcapitata, Lemna minor and Artemia fransiscana were evaluated. (8R,16R)-(-)-pyrenophorin was more toxic than (5S,8R,13S,16R)-(-)-pyrenophorol to V. fischeri, O. perornata, L. minor and A. fransiscana. The highest acute toxicity of (8R,16R)-(-)-pyrenophorin was exhibited on V. fischeri (5 min median effective concentration of 3.57 M 10(-5)) whereas the corresponding value for (5S,8R,13S,16R)-(-)-pyrenophorol was 801 M 10(-5). P. subcapitata exhibited a lack of sensitivity (median inhibitory concentration of >10 M 10(-5)) to both phytotoxins.
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