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The Transcription Factor FgStuAp Influences Spore Development, Pathogenicity, and Secondary Metabolism in Fusarium graminearum

Permanent URL:
http://handle.nal.usda.gov/10113/48515
Abstract:
Fusarium graminearum is an important plant-pathogenic fungus and the major cause of cereal head blight. Here, we report the functional analysis of FgStuA, the gene for a transcription factor with homology to key developmental regulators in fungi. The deletion mutant was greatly reduced in pathogenicity on wheat heads and in production of secondary metabolites. Spore production was significantly impaired in ΔFgStuA, which did not develop perithecia and sexual ascospores, and lacked conidiophores and phialides, leading to delayed production of aberrant macroconidia. FgStuAp appears to act as a global regulator that may affect many diverse aspects of the life cycle of F. graminearum. Transcriptome analysis shows that thousands of genes are differentially expressed in the mutant during asexual sporulation and infection of wheat heads and under conditions that induce secondary metabolites, including many that could account for the mutant phenotypes observed. The primary regulatory targets of FgStuAp are likely genes involved in cell-cycle control, and the predicted FgStuAp sequence has an APSES domain, with homology to helix-loop-helix proteins involved in cell-cycle regulation. The Aspergillus StuAp response element (A/TCGCGT/ANA/C) was found highly enriched in the promoter sequences of cell-cycle genes, which was upregulated in the ΔFgStuA deletion mutant.
Author(s):
Lysoe, Erik , Pasquali, Matias , Breakspear, Andrew , Kistler, H. Corby
Subject(s):
Gibberella zeae , plant pathogenic fungi , transcription factors , microbial genetics , gene expression regulation , fungal spores , sporulation , secondary metabolites , Triticum aestivum , wheat , pathogenicity , ascospores , sexual reproduction , conidiophores , conidia , life cycle (organisms) , transcriptome , transcriptomics , cell cycle , promoter regions
Format:
p. 54-67.
Note:
Includes references
Source:
Molecular plant-microbe interactions : MPMI 2011 Jan., v. 24, no. 1
Language:
English
Year:
2011
Collection:
Journal Articles, USDA Authors, Peer-Reviewed
File:
Download [PDF File]
Rights:
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.