title: ELP3 is involved in sexual and asexual development, virulence, and the oxidative stress response in Fusarium graminearum.
abstract: Fusarium graminearum is an important fungal plant pathogen that causes serious losses in cereal crop yields and mycotoxicoses in humans and livestock. In this study, we characterized an insertion mutant, Z39R9282, with pleiotropic defects in sexual development and virulence. We determined that the insertion occurred in a gene encoding an ortholog of yeast elongator complex protein 3 (ELP3). Deletion of elp3 led to significant defects in sexual and asexual development in F. graminearum. In the elp3 deletion mutant, the number of perithecia formed was reduced and maturation of perithecia was delayed. This mutant also produced morphologically abnormal ascospores and conidia. Histone acetylation in the elp3 deletion mutant was reduced compared with the wild type, which likely caused the developmental defects. Trichothecenes were not produced at detectable levels, and expression of trichothecene biosynthesis genes were significantly reduced in the elp3 deletion mutant. Infection of wheat heads revealed that the elp3 deletion mutant was unable to spread from inoculated florets to neighboring spikelets. Furthermore, the elp3 deletion mutant was more sensitive to oxidative stress than the wild type, and the expression of putative catalase genes was reduced. We demonstrate that elp3 functions in sexual and asexual development, virulence, and the oxidative stress response of F. graminearum by regulating the expression of genes involved in these various developmental processes.
authors.forename: Yoonji
authors.initials: Y
authors.lastname: Lee
authors.forename: Kyunghun
authors.initials: K
authors.lastname: Min
authors.forename: Hokyoung
authors.initials: H
authors.lastname: Son
authors.forename: Ae Ran
authors.initials: AR
authors.lastname: Park
authors.forename: Jin-Cheol
authors.initials: JC
authors.lastname: Kim
authors.forename: Gyung Ja
authors.initials: GJ
authors.lastname: Choi
authors.forename: Yin-Won
authors.initials: YW
authors.lastname: Lee
mesh_terms: D000107:Acetylation; D035263:Flowering Tops / Q000382:microbiology; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D005670:Fusarium / Q000166:cytology / Q000235:genetics* / Q000254:growth & development / Q000502:physiology; D017353:Gene Deletion; D015966:Gene Expression Regulation, Fungal; D006657:Histones / Q000378:metabolism; D025301:Hyphae; D016254:Mutagenesis, Insertional; D018384:Oxidative Stress; D010641:Phenotype; D010935:Plant Diseases / Q000382:microbiology*; D017434:Protein Structure, Tertiary; D013172:Spores, Fungal; D014255:Trichothecenes / Q000378:metabolism; D014908:Triticum / Q000382:microbiology*; D014774:Virulence
chemical_list: D005656:Fungal Proteins; D006657:Histones; D014255:Trichothecenes