Characterization of carbendazim sensitivity and trichothecene chemotypes of Fusarium graminearum in Jiangsu Province of China |
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| Affiliation: | 1. United States Department of Agriculture, Agricultural Research Service (USDA-ARS), Crop Genetics Research Unit, Stoneville, MS 38776, USA;2. Department of Computer and Information Sciences, Towson University, MD 21252, USA;3. USDA-ARS, Beltsville Agriculture Research Center, Beltsville, MD 21075, USA;4. Department of Plant Pathology, University of Georgia, Tifton, GA 31794, USA;5. USDA-ARS, Department of Crop Sciences, University of Illinois, Urbana, IL 61801, USA;6. Department of Plant Biology Pathology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901, USA;7. Department of Biochemistry and Microbiology, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901, USA;8. Department of Plant Pathology, University of Arkansas, Fayetteville, AR 72701, USA |
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| Abstract: | Fusarium head blight, one of the most damaging plant diseases in Jiangsu province of China, is a leading cause of economic loss and toxin accumulation in the crop, including nivalenol, deoxynivalenol and its acetylated derivatives. Disease control by carbendazim (MBC) has been applicated for many years, and the resistance frequency increased steadily. Furthermore, resistance may trigger toxin growth. Here, a total of 7261 isolates were collected throughout Jiangsu province from 2010 to 2012 to determine their sensitivity to MBC and trichothecene chemotypes. We studied the relevance between trichothecene chemotype and MBC-sensitivity, and found that the MBC-sensitive isolates occupied more NIV chemotype proportion up to date; 15-AcDON chemotype only existed in MBC-sensitive isolates; and most MBC-resistant isolates secreted 3-AcDON in chemotype. Besides, trichothecene production analyses indicated that MBC resistance increased 3-AcDON yield and percentage, especially site-directed mutants at codon 167 in the β2-tubulin gene. |
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| Keywords: | MBC resistance Trichothecene mycotoxins DON NIV |
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