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Gene expression during priming-induced resistance to fusarium head blight in wheat as revealed by two distinct mutants of Fusarium graminearum

ABSTRACT: Fusarium head blight (FHB) is a major disease of cereal crops caused by the fungus Fusarium graminearum (Fg). FHB affects the flowering heads (or spikes) and developing seeds. This study compare the gene expression profile in wheat spikelets (spk 2) inoculated with either water (mock treatment) or a pathogenic strain of Fusarium graminearum (WT); spikelets 2 were inoculated 24 hrs after a neighbour spikelet (spk 0) was treated with either water or F. graminerum mutant strain Tri6Δ or NoxABΔ. Spikelets 2 were sampled 8 and 24 hrs after the second treatment.

ORGANISM(S): Triticum aestivum

PROVIDER: GSE55653 | GEO | 2015/05/28

SECONDARY ACCESSION(S): PRJNA240300

REPOSITORIES: GEO

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Project description:Fusarium head blight (FHB) is a major disease of cereal crops caused by the fungus Fusarium graminearum (Fg). FHB affects the flowering heads (or spikes). This study compare the gene expression profile in wheat spikelets from near isogenic spring wheat lines carrying or not the FHB resistance QTL 2DL, after inoculation with water (H2O) or Fg; two inoculation methods were also compared, point and spray inoculation.

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Project description:Fusarium Head Blight (FHB) is a disease of wheat and other cereal crops, where Fusarium graminearum and related species infects the wheat inflorescence during and post-anthesis. The fungus produces trichothecene toxins that accumulate in the grain of infected head, and are required for disease spread. Microarrays were used to observe differential gene expression in the uninoculated spikelets of FHB-challenged wheat spikes in three wheat genotypes. A summary of our findings will be published in Plant Pathology. Three wheat genotypes were used: (1) 'Superb', an FHB-susceptible Canadian wheat cultivar; (2) GS-1-EM0040 (CIMMYT11x'Superb'*2), a double haploid line with good resistance to initial infection (Type 1 resistance), and moderate resistance to disease spread (Type 2 resistance); and (3) GS-1-EM0168 (CM82036x'Superb'*2), a double haploid line with moderate Type 1 resistance, and good Type 2 resistance. Five inocula were used: (A) water, (B) FgTri5+ (GZ3639, a trichothecene-producing F. graminearum strain); (C) FgTri5- (GZT40, a trichothecene-non-producing mutant of the F. graminearum strain GZ3639); (D) FgTri5 supplemented with deoxynivalenol (DON), which is the main trichothecene produced by FgTri5+; and (E) DON. The inocula were injected into two spikelets near the center of the spike during early stages of anthesis, and spikelets above and below the inoculation point were collected at 3, 8, and 24 h after inoculation. A zero-hour un-inoculated control was also collected from each line. Total RNA was extracted from collected spikelets, and microarray analysis was perfomed using the Affymetrix Wheat GeneChip.

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