Abstract
Rice blast, a devastating disease caused by the fungus Pyricularia oryzae, causes major losses to rice production, but it continuously evolves resistance against fungicides. Therefore, natural compounds need to be identified to develop new agents to control fungal pathogens. An ethyl acetate extract of a culture filtrate (S712-ECF) from isolate S712, a member of Polyporaceae collected from a paddy field in Shimane Prefecture in 2009, was sprayed on rice leaves 24 h before inoculation with conidia of P. oryzae. S712-ECF significantly suppressed blast lesion formation on leaves. Analysis of the internal transcribed spacer (ITS)-5.8S rDNA sequence of S712 showed that it shared high similarities with species of the fungus Annulohypoxylon. S712-ECF significantly inhibited in vitro conidial germination of P. oryzae in a dose-dependent manner and had a fungicidal effect against P. oryzae. Growth inhibition zones of P. oryzae were detected in thin layer chromatography assays of S712-ECF. The most effective compound in S712-ECF was heat-stable with a molecular weight < 3000 Da. Secondary metabolites of isolate S712 thus have potential for developing a new fungicidal agent against P. oryzae.
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The authors thank the Faculty of Life and Environmental Science at Shimane University for financial support to publish this report.
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The nucleotide sequence data reported are available in the DDBJ/EMBL/GenBank database under accession number LC496556.
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Moriguchi, Y., Kihara, J. & Ueno, M. Fungicidal activity of secondary metabolites from Annulohypoxylon sp. against the rice blast fungus, Pyricularia oryzae. J Gen Plant Pathol 86, 405–411 (2020). https://doi.org/10.1007/s10327-020-00936-0
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DOI: https://doi.org/10.1007/s10327-020-00936-0