Bacterial biocontrol of diseases caused by Sclerotinia in Australia
Article
Article Title | Bacterial biocontrol of diseases caused by Sclerotinia in Australia |
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ERA Journal ID | 5378 |
Article Category | Article |
Authors | Kamal, M. M. (Author), Lindbeck, K. (Author), Savocchia, S. (Author) and Ash, G. J. (Author) |
Journal Title | Acta Horticulturae |
Journal Citation | 1105, pp. 123-130 |
Number of Pages | 8 |
Year | 2015 |
Place of Publication | Belgium |
ISSN | 0567-7572 |
Digital Object Identifier (DOI) | https://doi.org/10.17660/ActaHortic.2015.1105.18 |
Web Address (URL) | http://www.actahort.org/books/1105/1105_18.htm |
Abstract | Among the diseases caused by Sclerotinia in Australia, lettuce drop, caused by the fungal pathogens Sclerotinia minor and Sclerotinia sclerotiorum, was considered as a model in this study as it poses a major threat to lettuce production in Australia,. The management of this disease with synthetic fungicides is strategic and the presence of fungicide residues in the consumable parts of lettuce is a continuing concern to human health. To address this challenge, Bacillus cereus SC-1 was chosen from a previous study, for biological control of S. sclerotiorum induced lettuce drop. Soil drenching with B. cereus SC-1 applied at 1×108 cfu mL-1 in a glasshouse trial completely restricted the pathogen, and no disease incidence was observed (P=0.05). Sclerotial colonization was tested and it was found that 6-8 log cfu per sclerotium of B. cereus resulted in a reduction of sclerotial viability to 1.58% compared to the control (P=0.05). Volatile organic compounds (VOC) produced by the bacteria increased root length, shoot length, and seedling fresh weight of the lettuce seedlings by 46.6, 35.4, and 32% respectively when compared with the control (P=0.05). In addition to VOC induced growth promotion, B. cereus SC-1 enhanced lettuce growth, resulting in increased root length, shoot length, head weight, and biomass weight by 34.8, 21.5, 19.4, and 24.8%, respectively when compared with untreated control plants (P=0.05). The bacteria were able to survive in the rhizosphere of lettuce plants for up to 30 days reaching populations of 7 log cfu g-1 of root-adhering soil. These results indicate that biological control of lettuce drop with B. cereus SC-1 could be feasible when used either alone or integrated into IPM and best management practice programs for sustainable management of lettuce drop and other Sclerotinia diseases. |
Keywords | Bacillus cereus sc-1; biological control; lettuce drop; Sclerotinia |
ANZSRC Field of Research 2020 | 300804. Horticultural crop protection (incl. pests, diseases and weeds) |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | Charles Sturt University |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q394q/bacterial-biocontrol-of-diseases-caused-by-sclerotinia-in-australia
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