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  • 1
    Online Resource
    Online Resource
    Untargeted MS-Based Metabolomic Analysis of Termite Gut-Associated Streptomycetes with Antifungal Activity against Pyrrhoderma noxium
    MDPI AG ; 2023
    In:  Antibiotics Vol. 12, No. 9 ( 2023-08-28), p. 1373-
    Details
    In: Antibiotics, MDPI AG, Vol. 12, No. 9 ( 2023-08-28), p. 1373-
    Abstract: Pyrrhoderma noxium is a plant fungal pathogen that induces the disease of brown root rot in a large variety of tree species. It is currently infecting many of the amenity trees within Brisbane City of Queensland, Australia. Steering away from harmful chemical fungicides, biological control agents offer environmentally friendly alternatives. Streptomycetes are known for their production of novel bioactive secondary metabolites with biocontrol potential, particularly, streptomycete symbionts isolated from unique ecological niches. In this study, 37 termite gut-associated actinomycete isolates were identified using molecular methods and screened against P. noxium. A majority of the isolates belonged to the genus Streptomyces, and 15 isolates exhibited strong antifungal activity with up to 98.5% mycelial inhibition of the fungal pathogen. MS/MS molecular networking analysis of the isolates’ fermentation extracts revealed several chemical classes with polyketides being among the most abundant. Most of the metabolites, however, did not have matches to the GNPS database, indicating potential novel antifungal compounds in the active extracts obtained from the isolates. Pathway enrichment and overrepresentation analyses revealed pathways relating to polyketide antibiotic production, among other antibiotic pathways, further confirming the biosynthetic potential of the termite gut-associated streptomycetes with biocontrol potential against P. noxium.
    Type of Medium: Online Resource
    ISSN: 2079-6382
    URL: Article
    DOI: 10.3390/antibiotics12091373
    Language: English
    Publisher: MDPI AG
    Publication Date: 2023
    detail.hit.zdb_id: 2681345-2
    SSG: 15,3
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  • 2
    Online Resource
    Online Resource
    Assessing the Various Antagonistic Mechanisms of Trichoderma Strains against the Brown Root Rot Pathogen Pyrrhoderma noxium Infecting Heritage Fig Trees
    MDPI AG ; 2022
    In:  Journal of Fungi Vol. 8, No. 10 ( 2022-10-19), p. 1105-
    Details
    In: Journal of Fungi, MDPI AG, Vol. 8, No. 10 ( 2022-10-19), p. 1105-
    Abstract: A wide range of phytopathogenic fungi exist causing various plant diseases, which can lead to devastating economic, environmental, and social impacts on a global scale. One such fungus is Pyrrhoderma noxium, causing brown root rot disease in over 200 plant species of a variety of life forms mostly in the tropical and subtropical regions of the globe. The aim of this study was to discover the antagonistic abilities of two Trichoderma strains (#5001 and #5029) found to be closely related to Trichoderma reesei against P. noxium. The mycoparasitic mechanism of these Trichoderma strains against P. noxium involved coiling around the hyphae of the pathogen and producing appressorium like structures. Furthermore, a gene expression study identified an induced expression of the biological control activity associated genes in Trichoderma strains during the interaction with the pathogen. In addition, volatile and diffusible antifungal compounds produced by the Trichoderma strains were also effective in inhibiting the growth of the pathogen. The ability to produce Indole-3-acetic acid (IAA), siderophores and the volatile compounds related to plant growth promotion were also identified as added benefits to the performance of these Trichoderma strains as biological control agents. Overall, these results show promise for the possibility of using the Trichoderma strains as potential biological control agents to protect P. noxium infected trees as well as preventing new infections.
    Type of Medium: Online Resource
    ISSN: 2309-608X
    URL: Article
    DOI: 10.3390/jof8101105
    Language: English
    Publisher: MDPI AG
    Publication Date: 2022
    detail.hit.zdb_id: 2784229-0
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  • 3
    Online Resource
    Online Resource
    Termite–gut-associated actinomycetes as biological control agents against phytopathogen Pyrrhoderma noxium
    CSIRO Publishing ; 2022
    In:  Microbiology Australia Vol. 43, No. 4 ( 2022-12-7), p. 190-193
    Details
    In: Microbiology Australia, CSIRO Publishing, Vol. 43, No. 4 ( 2022-12-7), p. 190-193
    Abstract: Brown root-rot disease is caused by phytopathogenic white-rot basidiomycete fungus, Pyyrhoderma noxium. Currently, it is causing significant issues for the Brisbane hinterland in Queensland, Australia and killing many tree species throughout the greater Metropolitan area, including park and street trees located in Shorncliffe, Taringa, New Farm, Eagle Farm, West End, Hamilton, Indooroopilly, Brisbane River, and the City Centre. Brisbane trees being attacked are figs, poinciana, jacarandas, Chinese elms, Moreton Bay eucalypts, kauris, and hoop pines and these include both public and privately owned trees. A joint study between the University of the Sunshine Coast (UniSC) and the Brisbane City Council (BCC) aimed to assess the efficacy of different biological control agents to control infections in the region. In a substudy presented here, termite gut-associated actinomycetes were evaluated to determine their antifungal abilities against the pathogen.
    Type of Medium: Online Resource
    ISSN: 1324-4272 , 2201-9189
    URL: Article
    DOI: 10.1071/MA22052
    Language: English
    Publisher: CSIRO Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2700264-0
    SSG: 12
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