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Transcriptome dynamics of a susceptible wheat upon Fusarium head blight reveals that molecular responses to Fusarium graminearum infection fit over the grain development processes

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Abstract

In many plant/pathogen interactions, host susceptibility factors are key determinants of disease development promoting pathogen growth and spreading in plant tissues. In the Fusarium head blight (FHB) disease, the molecular basis of wheat susceptibility is still poorly understood while it could provide new insights into the understanding of the wheat/Fusarium graminearum (Fg) interaction and guide future breeding programs to produce cultivars with sustainable resistance. To identify the wheat grain candidate genes, a genome-wide gene expression profiling was performed in the French susceptible wheat cultivar, Recital. Gene-specific two-way ANOVA of about 40 K transcripts at five grain developmental stages identified 1309 differentially expressed genes. Out of these, 536 were impacted by the Fg effect alone. Most of these Fg-responsive genes belonged to biological and molecular functions related to biotic and abiotic stresses indicating the activation of common stress pathways during susceptibility response of wheat grain to FHB. This analysis revealed also 773 other genes displaying either specific Fg-responsive profiles along with grain development stages or synergistic adjustments with the grain development effect. These genes were involved in various molecular pathways including primary metabolism, cell death, and gene expression reprogramming. An increasingly complex host response was revealed, as was the impact of both Fg infection and grain ontogeny on the transcription of wheat genes. This analysis provides a wealth of candidate genes and pathways involved in susceptibility responses to FHB and depicts new clues to the understanding of the susceptibility determinism in plant/pathogen interactions.

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Acknowledgments

This work is part of CC PhD work, funded by the French National Institute for Agronomic Research (INRA). We thank members of the PHACC unit for plant preparation, and Philippe Lecomte and Cyrille Saintenac for fruitful discussions.

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Correspondence to Ludovic Bonhomme or Thierry Langin.

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Fig. S1

Symptoms observed during susceptibility responses to Fg at the 250°Cd developmental stage. (a) and (b) represent control and Fg inoculated ears, (c) and (d) represent control and Fg infected grains, respectively. (PDF 60 kb)

Fig. S2

Check up on the microarray data by qRT-PCR. Micro-array (blue) and quantitative RT-PCR (red) data are expressed in a log2 ratio obtained for comparison between Fg-inoculated and control plants at three time points (250°Cd, 350°Cd and 450°Cd). (PDF 57 kb)

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Chetouhi, C., Bonhomme, L., Lasserre-Zuber, P. et al. Transcriptome dynamics of a susceptible wheat upon Fusarium head blight reveals that molecular responses to Fusarium graminearum infection fit over the grain development processes. Funct Integr Genomics 16, 183–201 (2016). https://doi.org/10.1007/s10142-016-0476-1

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  • DOI: https://doi.org/10.1007/s10142-016-0476-1

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