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http://hdl.handle.net/2239/32203
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| Title: | Isolation of Maize Soil and Rhizosphere Bacteria with Antagonistic Activity against Aspergillus flavus and Fusarium verticillioides. |
| Authors: | Palumbo, J.D.
O'Keeffe, T.L.
Abbas, H.K.
USDA, ARS |
| Keywords: | Wautersia
Zea mays
corn
field crops
soil
rhizoplane
isolation
soil bacteria
fungal antagonists
microbial pesticides
molecular systematics
chemotaxonomy
Burkholderia
Pseudomonas
Bacillus (bacteria)
Stenotrophomonas
Agrobacterium
Variovorax
food pathogens
Aspergillus flavus
Gibberella moniliformis
coculture
yeasts
molds (fungi)
plant pathogenic fungi
disease control
biological control
biological control agents
Mississippi |
| Issue Date: | 17-Oct-2007 |
| Description: | Bacterial isolates from Mississippi maize field soil and maize rhizosphere samples were evaluated for their potential as biological control agents against Aspergillus flavus and Fusarium verticillioides. Isolated strains were screened for antagonistic activities in liquid coculture against A. flavus and on agar media against A. flavus and F. verticillioides. We identified 221 strains that inhibited growth of both fungi. These bacteria were further differentiated by their production of extracellular enzymes that hydrolyzed chitin and yeast cell walls and by production of antifungal metabolites. Based on molecular and nutritional identification of the bacterial strains, the most prevalent genera isolated from rhizosphere samples were Burkholderia and Pseudomonas, and the most prevalent genera isolated from nonrhizosphere soil were Pseudomonas and Bacillus. Less prevalent genera included Stenotrophomonas, Agrobacterium, Variovorax, Wautersia, and several genera of coryneform and enteric bacteria. In quantitative coculture assays, strains of P. chlororaphis and P. fluorescens consistently inhibited growth of A. flavus and F. verticillioides in different media. These results demonstrate the potential for developing individual biocontrol agents for simultaneous control of the mycotoxigenic A. flavus and F. verticillioides. |
| URI: | http://seekspace.resip.ac.cn/handle/2239/32203 |
| Other Identifiers: | http://seekspace.resip.ac.cn/handle/10113/3580 |
| Appears in Collections: | 网络开放学术资源
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