Effect of tricyclazole on growth and secondary metabolism in Pyricularia oryzae |
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| Authors: | MChrysayi Tokousbalides HD Sisler |
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| Institution: | Department of Botany, University of Maryland, College Park, Maryland 20742 USA |
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| Abstract: | Tricyclazole 5-methyl-1,2,4-triazolo (3,4-b)-benzothiazole] controls rice blast disease caused by Pyricularia oryzae at concentrations (5–10 μg/ml) which do not inhibit growth of the pathogen in vitro. However, concentrations of 1 μg/ml or less inhibit melanin formation in the fungus. Production of pyriculol by the pathogen is usually enhanced by 10 μg/ml of tricyclazole, whereas production of 3,4-dihydro-4,8-dihydroxy-1(2H)-naphthalenone is strongly inhibited or markedly reduced and delayed. Evidence suggests that tricyclazole blocks aspects of polyketide metabolism in P. oryzae which may have a role in pathogenicity. |
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