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Figure 9 | BMC Plant Biology

Figure 9

From: HvCEBiP, a gene homologous to rice chitin receptor CEBiP, contributes to basal resistance of barley to Magnaporthe oryzae

Figure 9

Working model for the involvement of HvCEBiP to dual layers basal defense in M. oryzae -barley interaction. (A) When an M. oryzae appressorium attempts to penetrate a barley epidermal cell, host basal defenses based on the formation of papillae are induced by the recognition of M. oryzae by HvCEBiP or other pattern recognition receptors (PRRs). However, this basal defense is insufficient to inhibit appressorial penetration by the wild-type strain, which successfully establishes infection hyphae inside living host cells. In contrast, appressorial penetration by the mossd1 mutant is effectively restricted by the formation of papillae at attempted entry sites. (B) When infection hyphae of the mossd1 mutant successfully invade barley epidermal cells in HvCEBiP-silenced plants, a second layer of basal defense, associated with death of the initially infected cell, leads to restriction of hyphal development. This localized cell death also occurs in leaves inoculated with the wild-type strain, and may therefore be a general defense response to infection by M. oryzae. (C) When the wild-type strain successfully develops infection hyphae inside the initially infected cell without cell death reaction, the wild-type attempts the further infection to neighboring cells by development of infection hyphae.

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