Effects of validamycin in controlling Fusarium head blight caused by Fusarium graminearum: Inhibition of DON biosynthesis and induction of host resistance
| Autor: | Chengjie Yao, Xiayan Pan, Jing Li, Chuanhong Bian, Jianxin Wang, Yabing Duan, Mingguo Zhou |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0301 basic medicine Fusarium Health Toxicology and Mutagenesis Trehalase activity Genes Plant Rhizoctonia 01 natural sciences Virulence factor Microbiology Fungal Proteins 03 medical and health sciences chemistry.chemical_compound Trehalase Mycotoxin Triticum Disease Resistance Plant Diseases Virulence biology food and beverages General Medicine Validamycin biology.organism_classification Fungicides Industrial Fungicide 010602 entomology 030104 developmental biology chemistry Host-Pathogen Interactions Trichothecenes Agronomy and Crop Science Inositol |
| Zdroj: | Pesticide Biochemistry and Physiology. 153:152-160 |
| ISSN: | 0048-3575 |
| DOI: | 10.1016/j.pestbp.2018.11.012 |
| Popis: | Validamycin, known to interfere with fungal energy metabolism by inhibiting trehalase, has been extensively used to control plant diseases caused by Rhizoctonia spp. However, the effect of validamycin on controlling Fusarium graminearum has not been previously reported. In this study, when applied to F. graminearum in vitro, validamycin inhibited the synthesis of deoxynivalenol (DON), which is a mycotoxin and virulence factor, by decreasing trehalase activity and the production of glucose and pyruvate, which are precursors of DON biosynthesis. Because FgNTH encodes the main trehalase in F. graminearum, these effects were nullified in the FgNTH deletion mutant ΔFgNTH but restored in the complemented strain ΔFgNTHC. In addition, validamycin also increased the expression of pathogenesis-related genes (PRs) PR1, PR2, and PR5 in wheat, inducing resistance responses of wheat against F. graminearum. Therefore, validamycin exhibits dual efficacies on controlling Fusarium head blight (FHB) caused by F. graminearum: inhibition of DON biosynthesis and induction of host resistance. In addition, field trials further confirmed that validamycin increased FHB control and reduced DON contamination in grain. Control of FHB and DON contamination by validamycin increased when the antibiotic was applied with the triazole fungicide metconazole. Overall, this study is a successful case from foundational research to applied research, providing useful information for wheat protection programs against toxigenic fungi responsible for FHB and the consequent mycotoxin accumulation in grains. |
| Databáze: | OpenAIRE |
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