Aspergillus terreus obtained from mangrove exhibits antagonistic activities against Pythium aphanidermatum -induced damping-off of cucumber

A study was conducted to investigate the potential of Aspergillus terreus obtained from Avicennia marina mangrove roots in inhibiting Pythium aphanidermatum and damping-off disease of cucumber. Aspergillus terreus exhibited in vitro inhibition of Pythium aphanidermatum growth. Electron microscope ex...

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Bibliographic Details
Published in:PeerJ (San Francisco, CA) CA), 2019-10, Vol.7, p.e7884-e7884, Article e7884
Main Authors: Al-Shibli, Hanaa, Dobretsov, Sergey, Al-Nabhani, Abdulrahman, Maharachchikumbura, Sajeewa S.N, Rethinasamy, Velazhahan, Al-Sadi, Abdullah M
Format: Article
Language:English
Subjects:
Agricultural Science
Aspergillus terreus
Avicennia marina
Biocontrol
Biological control
Biological pest control
Cell culture
Cellulase
Crop diseases
Damping-off
Deoxyribonucleic acid
Diseases
DNA
Electrolytes
Electron microscopy
Enzymes
Ethanol
Fungi
Fungicides
Isolation
Mangrove
Marine environment
Marine fungi
Metabolites
Microbiology
Morphology
Oomycete
Pathogenic microorganisms
Pesticides
Plant Science
Pythium
Pythium aphanidermatum
Seedlings
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Summary:A study was conducted to investigate the potential of Aspergillus terreus obtained from Avicennia marina mangrove roots in inhibiting Pythium aphanidermatum and damping-off disease of cucumber. Aspergillus terreus exhibited in vitro inhibition of Pythium aphanidermatum growth. Electron microscope examination revealed that the antagonistic fungal isolate resulted in shrinking and groves in Pythium hypha. When Aspergillus terreus culture filtrate was added to Pythium aphanidermatum, it resulted in a significant increase (by 73%) in electrolyte leakage from Pythium hypha compared to the control, as well as significant reduction (by 71%) in oospore production. The Aspergillus terreus culture was also found to produce a cellulase enzyme, which is suggested to be involved in the antagonism against Pythium aphanidermatum. Adding Aspergillus terreus to soil infested with Pythium aphanidermatum significantly reduced percent mortality in cucumber seedlings by 70%. Aspergillus terreus, when applied alone on cucumber seedlings, did not show any suppressive effects on cucumber growth (length and fresh and dry weight). This appears to be the first report of isolation from mangrove of Aspergillus terreus with antagonistic activity against Pythium aphanidermatum-induced damping-off of cucumber. The study indicates that fungal isolates obtained from marine environments may serve as potential biocontrol agents against some plant pathogens.
ISSN:2167-8359
2167-8359
DOI:10.7717/peerj.7884