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báo cáo khoa học: " HvCEBiP, a gene homologous to rice chitin receptor CEBiP, contributes to basal resistance of barley to Magnaporthe oryzae"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: HvCEBiP, a gene homologous to rice chitin receptor CEBiP, contributes to basal resistance of barley to Magnaporthe oryzae | Tanaka et al. BMC Plant Biology 2010 10 288 http www.biomedcentral.com 1471-2229 10 288 BMC Plant Biology RESEARCH ARTICLE Open Access HvCEBiP a gene homologous to rice chitin receptor CEBiP contributes to basal resistance of barley to Magnaporthe oryzae Shigeyuki Tanaka1 6 Akari Ichikawa1 Kaori Yamada1 Gento Tsuji1 Takumi Nishiuchi2 Masashi Mori3 Hironori Koga3 Yoko Nishizawa4 Richard O Connell5 Yasuyuki Kubo1 Abstract Background 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 ssdl mutant of Magnaporthe oryzae which induces multiple host defense responses. Results The mossdl 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 mossdl mutant were spotted onto the leaves of HvCEBiP-silenced plants small brown necrotic flecks or blast lesions were produced but these lesions did not expand beyond the inoculation site. Wild-type M. oryzae also produced slightly more severe symptoms on the leaves of HvCEBiP-silenced plants. Cytological observation revealed that these lesions resulted from appressorium-mediated penetration into plant epidermal cells. Conclusions These results suggest that HvCEBiP is involved in basal resistance against appressorium-mediated infection and that basal resistance might be triggered by the recognition of chitin oligosaccharides derived from M. oryzae. Background To resist attack by microbial pathogens plants have evolved to recognize them triggering the expression of diverse defense reactions. The currently accepted model is that plants recognize .