Horn, B. W. and Dorner, J. W. (2011) Evaluation of different genotypes of nontoxigenic Aspergillus flavus for their ability to reduce aflatoxin contamination in peanuts. Biocontrol Science and Technology, 21 (7). pp. 865-876.
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Abstract
Aflatoxins produced by the fungus Aspergillus flavus are potent carcinogens and account for large monetary losses worldwide in peanuts, maize, and cottonseed. Biological control in which a nontoxigenic strain of A. flavus is applied to crops at high concentrations effectively reduces aflatoxins through competition with native aflatoxigenic populations. In this study, eight nontoxigenic strains of A. flavus belonging to different vegetative compatibility groups and differing in deletion patterns within the aflatoxin gene cluster were evaluated for their ability to reduce aflatoxin B1 when paired with eight aflatoxigenic strains on individual peanut seeds. Inoculation of wounded viable peanut seeds with conidia demonstrated that nontoxigenic strains differed in their ability to reduce aflatoxin B1. Reductions in aflatoxin B1 often exceeded expected reductions based on a 50:50 mixture of the two A. flavus strains, although one nontoxigenic strain significantly increased aflatoxin B1 when paired with an aflatoxigenic strain. Therefore, nontoxigenicity alone is insufficient for selecting a biocontrol agent and it is also necessary to test the effectiveness of a nontoxigenic strain against a variety of aflatoxigenic strains.
| Item Type: | Article |
|---|---|
| Additional Information: | Appreciation is given to Travis Walk and Milbra Schweikert for their technical assistance and to Richard Layton for his statistical advice. The mention of trade names or commercial products is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the US Department of Agriculture |
| Uncontrolled Keywords: | aflatoxin; Aspergillus flavus; biological control; groundnuts; peanuts |
| Author Affiliation: | National Peanut Research Laboratory, Agricultural Research Service, United States Department of Agriculture, PO Box 509, Dawson, GA 39842, USA |
| Subjects: | Plant Protection |
| Divisions: | Groundnut |
| Depositing User: | Mr Siva Shankar |
| Date Deposited: | 08 May 2012 06:23 |
| Last Modified: | 08 May 2012 06:23 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/5164 |
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