[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
[Objective] The aim was to study effect of Chaetomium globosum ND35 on plant growth and preliminary study of its biocontrol efficacy, and provide basis for popularization and application of this strain.[ Method] With ...[Objective] The aim was to study effect of Chaetomium globosum ND35 on plant growth and preliminary study of its biocontrol efficacy, and provide basis for popularization and application of this strain.[ Method] With endophytic fungus C. globosum ND35 as a tested strain, effect of C. globosumND35 on plant growth and its biocontrol on five plant diseases were investigated in the greenhouse and field,[Result]The results showed that ND35 promoted growth of lateral root and diameter of breast height of poplar. ND35 can induce poplar to resist Poplar Valsa Canker caused by Valsa sordida and Poplar Rust caused by Melampsora puplicola. ND35 was also able to induce tomato and bean to resist Botrytis cinera. Biocontrol of Bean Stem Rot Rhizoctonia by ND35 was effective as well. [Conclusion] Induced systemic resistance by endophytic C. globosum ND35 plays an important role in biocontrol of plant diseases.展开更多
A study was conducted on the molecular mechanism of small heat shock proteins （sHSPs） in Chaetomium globosum. Heat shock protein 22.4 （Hsp22.4） from C. globosum was cloned and expressed in Escherichia coli. BlastX...A study was conducted on the molecular mechanism of small heat shock proteins （sHSPs） in Chaetomium globosum. Heat shock protein 22.4 （Hsp22.4） from C. globosum was cloned and expressed in Escherichia coli. BlastX analysis revealed that the Hsp22.4 gene from C. globosum shared the highest identity in amino acid sequence with a Hsp gene from Neurospora crassa, and the identity between them was 65%. The C. globosum Hsp22.4 gene was inserted into the expressive vector of pGEX-4T-2 and the recombinant plasmid named pGEX-HSE E. coli BL21 transformed with pGEX-HSP plasmid was induced by IPTG, and the expressed proteins were analyzed with SDS-PAGE. A 50 kD protein was specially expressed in E. coli BL21, and the result was consistent with expectation, and showed that the Hsp22.4 gene had been expressed in E. coli. Our study has made a foundation for further studying the function ofsHSPs protein.展开更多
Polysaccharide produced from medicinal endophytic fungus not only has applications in foods,but also exhibits multiple biological activities.In this work,an endophytic fungus Chaetomium globosum CGMCC 6882 could use c...Polysaccharide produced from medicinal endophytic fungus not only has applications in foods,but also exhibits multiple biological activities.In this work,an endophytic fungus Chaetomium globosum CGMCC 6882 could use corn stover to produce a polysaccharide(GCP-SC)by consolidated bioprocess and the titer of GCP-SC reached 3.2 g/L.The transcriptional levels of genes related to cellulose degradation(cbh,cdh,glu and egl)in C.globosum CGMCC 6882 were 4.38,3.85,3.13,and 2.17 folds compared to the control group when corn stover was used as the sole carbon source.Moreover,GCP-SC showed a time-and dose-dependent manner of inhibitory effect on A549 cells and the inhibitory rate reached 93.3%.This work provides meaningful data on agricultural residues utilization and facilitation of future relative resource conversion studies.展开更多
Chaetomium globosum is one of the most common fungi in nature. It is best known for producing chaetoglobosins; however, the molecular basis of chaetoglobosin biosynthesis is poorly understood in this fungus. In this s...Chaetomium globosum is one of the most common fungi in nature. It is best known for producing chaetoglobosins; however, the molecular basis of chaetoglobosin biosynthesis is poorly understood in this fungus. In this study, we utilized RNA inter- ference （RNAi） to characterize a polyketide synthase gene, pks-1, in C. globosum that is involved in the production of chaeto- globosin A. When pks-1 was knocked down by RNAi, the production of chaetoglobosin A dramatically decreased. Knock-down mutants also displayed a pigment-deficient phenotype. These results suggest that the two polyketides, melanin and chaetoglobosin, are likely to share common biosynthetic steps. Most importantly, we found that pks-I also plays a critical role in sporulation. The silenced mutants ofpks-1 lost the ability to produce spores. We propose that polyketides may modulate cellular development via an unidentified action. We also suggest that C. globosum pks-1 is unique because of its triple role in melanin formation, chaetoglobosin biosynthesis and sporulation. This work may shed light on chaetoglobosin biosynthesis and indicates a relationship between secondary metabolism and fungal morphogenesis.展开更多
A new alkaloid, methyl 6-（isoprenyl）-lH-indole-3-carboxylate （1）, was isolated from the solid culture broth of fungus Chaetomium globosum, together with five known compounds, including N-acetyl-L-tryptophan （2）,...A new alkaloid, methyl 6-（isoprenyl）-lH-indole-3-carboxylate （1）, was isolated from the solid culture broth of fungus Chaetomium globosum, together with five known compounds, including N-acetyl-L-tryptophan （2）, xylariol B （3）, 5-（methoxymethyl）- 1H-pyrrole-2-carbaldehyde （4）, ergosterol （5） and ergosta-4,6,8（14）,22-tetraen-3-one （6）. Their chemical structures were elucidated by spectroscopic data （UV, IR, HRESIMS, and NMR）. In addition, it is the first report of compounds 2 and 3 from the fungus Chaetomium globosum.展开更多
Cytochalasans,with diverse structures and pharmacological activities,are a class of compounds containing isoindolinone moieties fused to the tricyclic or tetracyclic ring system.Chaetoglobosin A(cheA),mainly produced ...Cytochalasans,with diverse structures and pharmacological activities,are a class of compounds containing isoindolinone moieties fused to the tricyclic or tetracyclic ring system.Chaetoglobosin A(cheA),mainly produced by Chaetomium globosum,is the most abundant cytochalasan.However,limited understanding of transcriptional regulation of morphological development and cheA biosynthesis in C.globosum has hindered cheA application in agriculture and biomedical field.This study examined the regulatory role of CgVeA gene in C.globosum.CgVeA had significant effect on secondary metabolites production in C.globosum,similar to that reported in other filamentous fungi.Inactivation of CgVeA caused an obvious decrease in cheA production from 51.32 to 19.76 mg/L under dark conditions.In contrast,CgVeA overexpression resulted in a dramatic increase in cheA production,reaching 206.59 mg/L under light conditions,which was higher than that noted under dark condition.The RT-qPCR results confirmed that CgVeA,as a light responsive regulator,positively regulated cheA biosynthesis by controlling the expression of core genes of the cheA biosynthetic gene cluster and other relevant regulators.Electrophoretic mobility shift assays proved that CgVeA directly regulated LaeA,cheR,and p450,and indirectly regulated PKS.Moreover,CgVeA had a significant effect on the regulation of asexual spores production.When compared with wild-type C.globosum,CgVeA-silenced and CgVeA overexpression mutants presented remarkable differences in sporulation,irrespective of light or dark condition.Besides,CgVeA expression was speculated to negatively regulate spore formation.These findings illustrated the regulatory mechanism of a hypothetical global regulator,CgVeA,in C.globosum,suggesting its potential application in industrial-scale cheA biosynthesis.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Supported by National Natural Science Foundation of China(30872024,30571498)Students Research Training (SRT) of Shandong Agricultural University (0802024)~~
文摘[Objective] The aim was to study effect of Chaetomium globosum ND35 on plant growth and preliminary study of its biocontrol efficacy, and provide basis for popularization and application of this strain.[ Method] With endophytic fungus C. globosum ND35 as a tested strain, effect of C. globosumND35 on plant growth and its biocontrol on five plant diseases were investigated in the greenhouse and field,[Result]The results showed that ND35 promoted growth of lateral root and diameter of breast height of poplar. ND35 can induce poplar to resist Poplar Valsa Canker caused by Valsa sordida and Poplar Rust caused by Melampsora puplicola. ND35 was also able to induce tomato and bean to resist Botrytis cinera. Biocontrol of Bean Stem Rot Rhizoctonia by ND35 was effective as well. [Conclusion] Induced systemic resistance by endophytic C. globosum ND35 plays an important role in biocontrol of plant diseases.
文摘A study was conducted on the molecular mechanism of small heat shock proteins （sHSPs） in Chaetomium globosum. Heat shock protein 22.4 （Hsp22.4） from C. globosum was cloned and expressed in Escherichia coli. BlastX analysis revealed that the Hsp22.4 gene from C. globosum shared the highest identity in amino acid sequence with a Hsp gene from Neurospora crassa, and the identity between them was 65%. The C. globosum Hsp22.4 gene was inserted into the expressive vector of pGEX-4T-2 and the recombinant plasmid named pGEX-HSE E. coli BL21 transformed with pGEX-HSP plasmid was induced by IPTG, and the expressed proteins were analyzed with SDS-PAGE. A 50 kD protein was specially expressed in E. coli BL21, and the result was consistent with expectation, and showed that the Hsp22.4 gene had been expressed in E. coli. Our study has made a foundation for further studying the function ofsHSPs protein.
基金supported by the Natural Science Foundation of Youth Support Plan of Henan University of Technology (2017QNJH10)High Level Research Fund for Qualified People of Henan University of Technology (2017BS011)the Natural Science Foundation of Henan Province Education Department (19A180015)
文摘Polysaccharide produced from medicinal endophytic fungus not only has applications in foods,but also exhibits multiple biological activities.In this work,an endophytic fungus Chaetomium globosum CGMCC 6882 could use corn stover to produce a polysaccharide(GCP-SC)by consolidated bioprocess and the titer of GCP-SC reached 3.2 g/L.The transcriptional levels of genes related to cellulose degradation(cbh,cdh,glu and egl)in C.globosum CGMCC 6882 were 4.38,3.85,3.13,and 2.17 folds compared to the control group when corn stover was used as the sole carbon source.Moreover,GCP-SC showed a time-and dose-dependent manner of inhibitory effect on A549 cells and the inhibitory rate reached 93.3%.This work provides meaningful data on agricultural residues utilization and facilitation of future relative resource conversion studies.
基金the National Natural Science Foundation of China (Grant No. 30970084)the National Basic Research Program of China (Grant No. 2007CB707801)
文摘Chaetomium globosum is one of the most common fungi in nature. It is best known for producing chaetoglobosins; however, the molecular basis of chaetoglobosin biosynthesis is poorly understood in this fungus. In this study, we utilized RNA inter- ference （RNAi） to characterize a polyketide synthase gene, pks-1, in C. globosum that is involved in the production of chaeto- globosin A. When pks-1 was knocked down by RNAi, the production of chaetoglobosin A dramatically decreased. Knock-down mutants also displayed a pigment-deficient phenotype. These results suggest that the two polyketides, melanin and chaetoglobosin, are likely to share common biosynthetic steps. Most importantly, we found that pks-I also plays a critical role in sporulation. The silenced mutants ofpks-1 lost the ability to produce spores. We propose that polyketides may modulate cellular development via an unidentified action. We also suggest that C. globosum pks-1 is unique because of its triple role in melanin formation, chaetoglobosin biosynthesis and sporulation. This work may shed light on chaetoglobosin biosynthesis and indicates a relationship between secondary metabolism and fungal morphogenesis.
基金National Natural Science Foundation of China(Grant No.31570361)
文摘A new alkaloid, methyl 6-（isoprenyl）-lH-indole-3-carboxylate （1）, was isolated from the solid culture broth of fungus Chaetomium globosum, together with five known compounds, including N-acetyl-L-tryptophan （2）, xylariol B （3）, 5-（methoxymethyl）- 1H-pyrrole-2-carbaldehyde （4）, ergosterol （5） and ergosta-4,6,8（14）,22-tetraen-3-one （6）. Their chemical structures were elucidated by spectroscopic data （UV, IR, HRESIMS, and NMR）. In addition, it is the first report of compounds 2 and 3 from the fungus Chaetomium globosum.
基金This work was supported in part by grant from the Harbin Science and Technology Project(No.2016AB3AP042).
文摘Cytochalasans,with diverse structures and pharmacological activities,are a class of compounds containing isoindolinone moieties fused to the tricyclic or tetracyclic ring system.Chaetoglobosin A(cheA),mainly produced by Chaetomium globosum,is the most abundant cytochalasan.However,limited understanding of transcriptional regulation of morphological development and cheA biosynthesis in C.globosum has hindered cheA application in agriculture and biomedical field.This study examined the regulatory role of CgVeA gene in C.globosum.CgVeA had significant effect on secondary metabolites production in C.globosum,similar to that reported in other filamentous fungi.Inactivation of CgVeA caused an obvious decrease in cheA production from 51.32 to 19.76 mg/L under dark conditions.In contrast,CgVeA overexpression resulted in a dramatic increase in cheA production,reaching 206.59 mg/L under light conditions,which was higher than that noted under dark condition.The RT-qPCR results confirmed that CgVeA,as a light responsive regulator,positively regulated cheA biosynthesis by controlling the expression of core genes of the cheA biosynthetic gene cluster and other relevant regulators.Electrophoretic mobility shift assays proved that CgVeA directly regulated LaeA,cheR,and p450,and indirectly regulated PKS.Moreover,CgVeA had a significant effect on the regulation of asexual spores production.When compared with wild-type C.globosum,CgVeA-silenced and CgVeA overexpression mutants presented remarkable differences in sporulation,irrespective of light or dark condition.Besides,CgVeA expression was speculated to negatively regulate spore formation.These findings illustrated the regulatory mechanism of a hypothetical global regulator,CgVeA,in C.globosum,suggesting its potential application in industrial-scale cheA biosynthesis.
