Journal
PEST MANAGEMENT SCIENCE
Volume 67, Issue 2, Pages 191-198Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.2050
Keywords
Gibberella zeae; benzimidazole resistance; beta(2)-tubulin gene; site-directed mutagenesis
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Funding
- National Science Fundation of China [30971891, 30671348]
- Natural Science Foundation of Jiangsu Province [BK2008337]
- Chinese 973 programs [2009CB118906, 2006CB101907]
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BACKGROUND: The efficacy of benzimidazole fungicides is often limited by resistance, and this is the case with the use of carbendazim for controlling Fusarium head blight caused by Gibberella zeae (Schwein.) Petch (anamorph Fusarium graminearum). Recent studies have shown that carbendazim resistance in field strains of G. zeae is associated with mutations in the beta(2)-tubulin gene. The aims of the present study were to validate this mechanism and research the binding sites of carbendazim on beta(2)-tubulin. RESULTS: This work used site-directed mutagenesis followed by gene replacement to change the beta(2)-tubulin gene of a carbendazim-sensitive field strain of G. zeae at residues 50, 167, 198 or 200. The transformants were confirmed and tested for their sensitivity to carbendazim. All the mutants were resistant to carbendazim, but the level of resistance differed depending on the mutation. Biological characteristics did not differ between the field strain and the site-directed mutants. A three-dimensional model of beta(2)-tubulin was constructed, and the possible carbendazim binding site was analysed. CONCLUSION: Mutations at codons 50, 167, 198 and 200 of G. zeae beta(2)tub could cause resistance to carbendazim, and these codons may form a binding pocket. (C) 2010 Society of Chemical Industry
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