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Background  Leucine-rich repeat receptor-like kinases (LRR-RLKs) represent a large class of proteins in regulating plant development and immunity. The LRR-RLK XA21 confers resistance to the bacterial disease caused by the pathogen of  Xanthomonas oryzae pv. oryzae  ( Xoo ). Several XA21 binding proteins have been characterized, however the early events governing XA21 signaling have not been fully elucidated.    Results  Here we report the identification of one LRR-RLK gene ( XIK1 ) whose expression is induced rapidly upon the infection with the pathogen of  Xoo . Expression pattern analysis reveals that  XIK1  is preferentially expressed in reproductive leaves and panicles, and that expression is associated with plant development. By using RNA interference (RNAi), we silenced the expression of  XIK1  in rice with  Xa21  and found that reduced expression of  XIK1  compromised disease resistance mediated by XA21. In addition, we found that the expression of the downstream marker genes of pathogen associated molecular pattern (PAMP) triggered immunity (PTI) in rice was compromised in  Xa21  plants silenced for  XIK1 .    Conclusion  Our study reveals that the LRR-RLK gene  XIK1  is  Xoo -responsive and positively regulates  Xa21 -mediated disease resistance.    Electronic supplementary material  The online version of this article (doi:10.1186/s12284-014-0034-1) contains supplementary material, which is available to authorized users.

A receptor like kinase gene with expressional responsiveness on Xanthomonas oryzae pv. oryzae is essential for Xa21-mediated disease resistance