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Cochliobolus heterostrophus Pol2 and Pol5 mutants are pleiotropic, and each mutant gene is responsible for alterations of both unrelated phenotypes: reddishbrown pigmentation and polyoxin resistance. The three pigments accumulated in these mutants were isolated. Structural characterization by spectroscopic analyses indicated that these three pigments were polyhydroxyanthraquinones: emodin, chrysophanol, and citreorosein. Emodin is known to be an antidote against benzimidazole fungicide, although no antidoting activity against polyoxin was observed.
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Tanaka et al. (2002) studied this question.
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