[Objective] Inhibition mechanism of the antifungal substances from Chaetomium globosum ND35 against pathogenic fungi of Valsa canker was investigated.[Method] The inhibitory effect of antifungal substances （AFS） pro...[Objective] Inhibition mechanism of the antifungal substances from Chaetomium globosum ND35 against pathogenic fungi of Valsa canker was investigated.[Method] The inhibitory effect of antifungal substances （AFS） produced by endophytic C. globosum ND35 on pathogenic fungi of Valsa canker was studied by means of dual culture,extraction,thin layer chromatography and bioassay of antifungal activity. [Result] The crude extracts of AFS could strongly inhibit Valsa sordida and V. mali. The suppression percentage of mycelial growth of two pathogenic fungi were 66.4% and 72.6%,respectively. The inhibition percentages of conidia germination of two pathogenic fungi were 92.2% and 80.4%,respectively. Separation of thin layer chromatography and bioassay of antifungal activity indicated that the fraction No.2 of AFS played an important role in the process of inhibition on pathogenic fungi,causal agents of Valsa canker. [Conclusion] The antifungal substances from C. globosum ND35 is potential for biological control on Valsa canker.展开更多
Bacillus subtitles JA isolated by our laboratory produced a large amount of anti-fungal substances, which had strong inhibitory activity against various plant pathogenic fungi, such as Rhizoctonia solani, Fusarium gra...Bacillus subtitles JA isolated by our laboratory produced a large amount of anti-fungal substances, which had strong inhibitory activity against various plant pathogenic fungi, such as Rhizoctonia solani, Fusarium graminearum and so on. Ion beam implantation as a new mutagenic methods was applied in our studay. After B. subtitles JA was implanted by N+ ions, a strain designated as B. subtitles JA-026 was screened and obtained, which had a higher ability to produce those antifungal substances. A series of experiments indicated that the antifungal substances were thermostable and partially sensitive to proteinases K and tryproteinase. When the fermentating broth was fractionated with ammonium sulphate of a final saturation of 70%, the precipitate-enhanced inhibitory activity while the supernatant lost this activity. It appeared that the antifungal substances were likely to be protein.展开更多
基金Supported by National Natural Science Foundation of China(30571489)Shandong Agricultural University Youth Science and Technology Innovation Fund Projects(23406)~~
文摘[Objective] Inhibition mechanism of the antifungal substances from Chaetomium globosum ND35 against pathogenic fungi of Valsa canker was investigated.[Method] The inhibitory effect of antifungal substances （AFS） produced by endophytic C. globosum ND35 on pathogenic fungi of Valsa canker was studied by means of dual culture,extraction,thin layer chromatography and bioassay of antifungal activity. [Result] The crude extracts of AFS could strongly inhibit Valsa sordida and V. mali. The suppression percentage of mycelial growth of two pathogenic fungi were 66.4% and 72.6%,respectively. The inhibition percentages of conidia germination of two pathogenic fungi were 92.2% and 80.4%,respectively. Separation of thin layer chromatography and bioassay of antifungal activity indicated that the fraction No.2 of AFS played an important role in the process of inhibition on pathogenic fungi,causal agents of Valsa canker. [Conclusion] The antifungal substances from C. globosum ND35 is potential for biological control on Valsa canker.
基金The project supported by the National Key Project of China(No.2001BA302B-4)and the Nature Science Foundation of Anhui Province(No.01041401)
文摘Bacillus subtitles JA isolated by our laboratory produced a large amount of anti-fungal substances, which had strong inhibitory activity against various plant pathogenic fungi, such as Rhizoctonia solani, Fusarium graminearum and so on. Ion beam implantation as a new mutagenic methods was applied in our studay. After B. subtitles JA was implanted by N+ ions, a strain designated as B. subtitles JA-026 was screened and obtained, which had a higher ability to produce those antifungal substances. A series of experiments indicated that the antifungal substances were thermostable and partially sensitive to proteinases K and tryproteinase. When the fermentating broth was fractionated with ammonium sulphate of a final saturation of 70%, the precipitate-enhanced inhibitory activity while the supernatant lost this activity. It appeared that the antifungal substances were likely to be protein.
