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Background  The rice immune receptor XA21 confers resistance to  Xanthomonas oryzae pv. oryzae  ( Xoo ), the causal agent of bacterial leaf blight. We previously demonstrated that an auxilin-like protein, XA21 BINDING PROTEIN 21 (XB21), positively regulates resistance to  Xoo .    Results  To further investigate the function of XB21, we performed a yeast two-hybrid screen. We identified 22 unique XB21 interacting proteins, including LEUCINE-RICH REPEAT PROTEIN 1 (LRR1), which we selected for further analysis. Silencing of  LRR1  in the XA21 genetic background (XA21-LRR1Ri) compromises resistance to  Xoo  compared with control XA21 plants. XA21-LRR1Ri plants have reduced  Xa21  transcript levels and reduced expression of genes that serve as markers of XA21-mediated activation. Overexpression of  LRR1  is insufficient to alter resistance to  Xoo  in rice lines lacking XA21.    Conclusions  Taken together, our results indicate that LRR1 is required for wild-type  Xa21  transcript expression and XA21-mediated immunity.    Electronic supplementary material  The online version of this article (doi:10.1186/s12284-017-0162-5) contains supplementary material, which is available to authorized users.

Silencing of the Rice Gene LRR1 Compromises Rice Xa21 Transcript Accumulation and XA21-Mediated Immunity