Host-selective toxins of Pyrenophora tritici-repentis induce common responses associated with host susceptibility.

摘要: Pyrenophora tritici-repentis (Ptr), a necrotrophic fungus and the causal agent of tan spot wheat, produces one or combination host-selective toxins (HSTs) necessary for disease development. The two most studied produced by Ptr, Ptr ToxA (ToxA) ToxB (ToxB), are proteins that cause necrotic chlorotic symptoms respectively. Investigation host responses induced HSTs provides better insight into nature susceptibility. Microarray analysis has provided evidence it can elicit similar to those associated with defense. In order evaluate whether there consistent susceptibility, ToxB-induced changes in same sensitive cultivar was conducted. Comparative ToxA- transcriptional showed groups genes encoding WRKY transcription factors, RLKs, PRs, components phenylpropanoid jasmonic acid pathways activated. ROS accumulation photosystem dysfunction proved be common mechanism-of-action these toxins. Despite similarities defense responses, biochemical as well symptom development occur more rapidly compared ToxB, which could explained differences perception activation specific process, example, ethylene biosynthesis treatment. Results this study suggest will result part susceptible interaction further supports hypothesis fungi exploit induce cell death.