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

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

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Abstract 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, 3 Piece RAF Sectional 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 ORG BUCKWHEAT FLOUR 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.