Sirodesmin PL, deacetylsirodesmin PL and sirodesmin C were isolated from cultures of an aggressive strain of Leptosphaeria maculans, purified by thin layer and column chromatography, and tested on leaves and roots of 14 host and non‐host plants of the pathogen. The sirodesmins showed no host‐specificity. However, various plant species developed symptoms of different severities. In both bioassay systems deacetylsirodesmin PL had a lower phytotoxicity than sirodesmin PL and sirodes‐min C. Our results show that sirodesmins belong to the non‐host‐specific phytotoxins.
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Badawy et al. (1989) studied this question.
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