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5. Development and application of loop-mediated isothermal amplification for detection of the F167Y mutation of carbendazim-resistant isolates in Fusarium graminearum

Author

Yabing Duan, Changyan Ge, Jianxin Wang, Zhang Xiaoke, Cao Junhong, Yong Wang, Xiaojing Jia, and Mingguo Zhou

Subjects
Molecular Sequence Data, Loop-mediated isothermal amplification, Gene Expression, Biology, Article, Fungal Proteins, chemistry.chemical_compound, Fusarium, Naphthalenesulfonates, Drug Resistance, Fungal, Tubulin, Point Mutation, Protein Isoforms, Coloring Agents, Triticum, DNA Primers, Plant Diseases, Gel electrophoresis, Genetics, Fungal protein, Multidisciplinary, Base Sequence, Point mutation, Fungal genetics, Nucleic acid amplification technique, Molecular biology, Fungicides, Industrial, Hydroxynaphthol blue, chemistry, Mutation (genetic algorithm), Benzimidazoles, Carbamates, Nucleic Acid Amplification Techniques
Abstract

Resistance of Fusarium graminearum to carbendazim is caused by point mutations in the β2-tubulin gene. The point mutation at codon 167 (TTT → TAT, F167Y) occurs in more than 90% of field resistant isolates in China. To establish a suitable method for rapid detection of the F167Y mutation in F. graminearum, an efficient and simple method with high specificity was developed based on loop-mediated isothermal amplification (LAMP). A set of four primers was designed and optimized to specially distinguish the F167Y mutation genotype. The LAMP reaction was optimal at 63°C for 60 min. When hydroxynaphthol blue dye (HNB) was added prior to amplification, samples with DNA of the F167Y mutation developed a characteristic sky blue color after the reaction but those without DNA or with different DNA did not. Results of HNB staining method were reconfirmed by gel electrophoresis. The developed LAMP had good specificity, stability and repeatability and was suitable for monitoring carbendazim-resistance populations of F. graminearum in agricultural production.

Published
2014

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