NDLI: Antagonism of Bacillus spp. Isolated from Marine Biofilms Against Terrestrial Phytopathogenic Fungi

Content Provider	Springer Nature Link
Author	Ortega Morales, B. O. Ortega Morales, F. N. Lara Reyna, J. Rosa García, S. C. Martínez Hernández, A. Montero M., Jorge
Copyright Year	2008
Abstract	We aimed at determining the antagonistic behavior of bacteria derived from marine biofilms against terrestrial phytopathogenic fungi. Some bacteria closely related to Bacillus mojavensis (three isolates) and Bacillus firmus (one isolate) displayed antagonistic activity against Colletotrichum gloeosporioides ATCC 42374, selected as first screen organism. The four isolates were further quantitatively tested against C. gloeosporioides, Colletotrichum fragariae, and Fusarium oxysporum on two culture media, potato dextrose agar (PDA) and a marine medium-based agar [yeast extract agar (YEA)] at different times of growth of the antagonists (early, co-inoculation with the pathogen and late). Overall antagonistic assays showed differential susceptibility among the pathogens as a function of the type of culture media and time of colonization (P < 0.05). In general, higher suppressive activities were recorded for assays performed on YEA than on PDA; and also when the antagonists were allowed to grow 24 h earlier than the pathogen. F. oxysporum was the most resistant fungus while the most sensitive was C. gloeosporioides ATCC 42374. Significant differences in antagonistic activity (P < 0.05) were found between the different isolates. In general, Bacillus sp. MC3B-22 displayed a greater antagonistic effect than the commercial biocontrol strain Bacillus subtilis G03 (Kodiak®). Further incubation studies and scanning electronic microscopy revealed that Bacillus sp. MC3B-22 was able to colonize, multiply, and inhibit C. gloeosporioides ATCC 42374 when tested in a mango leaf assay, showing its potential for fungal biocontrol. Additional studies are required to definitively identify the active isolates and to determine their mode of antifungal action, safety, and biocompatibility.
Starting Page	375
Ending Page	383
Page Count	9
File Format	PDF
ISSN	14362228
Journal	Marine Biotechnology
Volume Number	11
Issue Number	3
e-ISSN	14362236
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-10-18
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Marine biofilm Bacillus spp. Phytopathogens Antagonism Colonization Engineering Zoology Microbiology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Biotechnology

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