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- W2383260369 abstract "Helminthosporium gramineum Rabenh f. sp. echinochloae （HGE）, a promising fungus for controlling barnyardgrass, was evaluated for biocontrol of sheath blight in rice caused by Rhizoctonia solani Kuhn. On a PDA plate, the antagonistic result showed that the inhibitory activity of HGE strain against the mycelial growth of R. solani was 83.5 %. Culture filtrate of HGE strain showed strong inhibitory activity against R. solani with a relative inhibitory rate of 84.1% at the 5-fold diluted filtrate. On PDA plate, mycelial growth of R. solani was completely inhibited by crude toxins （ethyl acetate extract of culture filtrate and mycelia of HGE） produced by HGE strain at 200Mu-g/mL. One compound with high inhibitory activity against the growth of R. solani was isolated from the extracts of culture filtrate and mycelia of HGE. The bioactive compound was identified as Ophiobolin A through detailed analysis of NMR and MS data of the compound and the comparison with the reported spectra data. The relative inhibitory rate of Ophiobolin A against R. solani was 100%and 70.2% at 25Mu-g/ml. and 1Mu-g/mL., respectively. These results indicated that HGE strain and its metabolite Ophiobolin A could be potentially developed as a natural fungicide for the control of rice sheath blight." @default.
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- W2383260369 date "2006-01-01" @default.
- W2383260369 modified "2023-09-22" @default.
- W2383260369 title "Biocontrol of rice sheath blight by Helminthosporium gramineum Rabenh f. sp. echinochloae and its metabolite ophiobolin A" @default.
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