<it>HvCEBiP</it>, a gene homologous to rice chitin receptor <it>CEBiP</it>, contributes to basal resistance of barley to <it>Magnaporthe oryzae</it>
2010
Koga Hironori | Mori Masashi | Nishiuchi Takumi | Tsuji Gento | Yamada Kaori | Ichikawa Akari | Tanaka Shigeyuki | Nishizawa Yoko | O'Connell Richard | Kubo Yasuyuki
<p>Abstract</p> <p>Background</p> <p>Rice CEBiP recognizes chitin oligosaccharides on the fungal cell surface or released into the plant apoplast, leading to the expression of plant disease resistance against fungal infection. However, it has not yet been reported whether CEBiP is actually required for restricting the growth of fungal pathogens. Here we evaluated the involvement of a putative chitin receptor gene in the basal resistance of barley to the <it>ssd1 </it>mutant of <it>Magnaporthe oryzae</it>, which induces multiple host defense responses.</p> <p>Results</p> <p>The <it>mossd1 </it>mutant showed attenuated pathogenicity on barley and appressorial penetration was restricted by the formation of callose papillae at attempted entry sites. When conidial suspensions of <it>mossd1 </it>mutant were spotted onto the leaves of <it>HvCEBiP</it>-silenced plants, small brown necrotic flecks or blast lesions were produced but these lesions did not expand beyond the inoculation site. Wild-type <it>M. oryzae </it>also produced slightly more severe symptoms on the leaves of <it>HvCEBiP</it>-silenced plants. Cytological observation revealed that these lesions resulted from appressorium-mediated penetration into plant epidermal cells.</p> <p>Conclusions</p> <p>These results suggest that <it>HvCEBiP </it>is involved in basal resistance against appressorium-mediated infection and that basal resistance might be triggered by the recognition of chitin oligosaccharides derived from <it>M. oryzae</it>.</p>
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