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Oryza meyeriana , a wild species of rice from China, shows high resistance to  Xanthomonas oryzae  pv.  oryzae  (Xoo), the cause of rice bacterial blight, one of the most serious rice pathogens. To better understand the resistance mechanism, a proteomic study was conducted to identify changes in the proteins secreted in embryo cell suspension cultures in response to Xoo. After two-dimensional difference gel electrophoresis (2D-DIGE), 72 differentially expressed protein spots corresponding to 34 proteins were identified by Matrix-Assisted Laser Desorption/ Ionization Time of Flight Mass Spectrometry. Of the 34 proteins, 10 were up regulated and 24 down regulated. The secreted proteins identified were predicted to be involved in various biological processes, including signal transduction, defense, ROS and cell wall modification. 77% of the 34 proteins were predicted to have a signal peptide by Signal P. Quantitative Real-Time PCR showed that transcript levels of 14 secreted proteins were not well correlated with secreted protein levels. Peroxidase activity was up regulated in both  O .  meyriana  and susceptible rice but was about three times higher in  O .  meyeriana . This suggests that peroxidases may play an important role in the early response to Xoo in  O .  meyeriana . These results not only provide a better understanding of the resistance mechanism of  O .  meyeriana , but have implications for studies of the interactions between other plants and their pathogens.

Analysis of the Proteins Secreted from the Oryza meyeriana Suspension-Cultured Cells Induced by Xanthomonas oryzae pv. oryzae