Abstract
Bread wheat (BW) and durum wheat (DW) are both strongly affected by Septoria tritici blotch caused by the hemibiotrophic fungus Zymoseptoria tritici. However, only the BW-Z. tritici pathosystem has been well studied so far. Here, we compared compatible interactions between Z. tritici and both BW and DW species at the cytological, biochemical and molecular levels. Fungal infection process investigations showed close spore germination and leaf penetration features in both interactions, although differences in the patterns of these events were observed. During the necrotrophic phase, disease severity and sporulation levels were associated in both interactions with increases of the two cell-wall degrading enzyme activities endo-β-1,4-xylanase and endo-β-1,3-glucanase as well as protease. An analysis of plant defense responses during the first five days post inoculation revealed inductions of GLUC, Chi4, POX and PAL and a repression of LOX gene expressions in both wheat species, although differences in kinetics and levels of induction or repression were observed. In addition, peroxidase, catalase, glucanase, phenylalanine ammonia-lyase and lipoxygenase activities were induced in both wheat species, while only weak accumulations of hydrogen peroxide and polyphenols were detected at the fungal penetration sites. Our study revealed overall a similarity in Z. tritici infection process and triggered wheat defense pathways on both pathosystems.
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Acknowledgment
Lamia Somai-Jemmali was supported by Campus France for internships in Institut Supérieur d’Agriculture (Lille, France) and Université du Littoral Côte d’Opale (Calais, France).
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Somai-Jemmali, L., Randoux, B., Siah, A. et al. Similar infection process and induced defense patterns during compatible interactions between Zymoseptoria tritici and both bread and durum wheat species. Eur J Plant Pathol 147, 787–801 (2017). https://doi.org/10.1007/s10658-016-1043-2
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DOI: https://doi.org/10.1007/s10658-016-1043-2