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Physiology/Biochemistry

Effect of melanin biosynthesis inhibiting compounds on Gaeumannomyces species

Pages 370-374 | Accepted 14 Feb 1995, Published online: 29 Aug 2018
 

Abstract

Inhibition of melanin production was observed in Gaeumannomyces isolates treated with DHN-melanin inhibiting compounds (tricyclazole, pyroquilon, fthalide and chlobenthiazone) but not with DOPA-melanin inhibiting compounds (tropolone, kojic acid, 2-mercaptobenzimidazole and diethyldithiocarbamate). This indicates that the melanin associated with cell walls of G. graminis and G. incrustans is DHN-melanin. Depending on the compound, consistent inhibition of melanin was observed at levels that were not inhibitory to fungal growth. In vitro pathogenicity to wheat by these isolates was not affected by the DHN-melanin compounds.

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