Figure 5.

Phosphorylation of Tyr-610 is (A) required for enhanced BR signaling and the basal expression of many defense genes, but (B) is not required for flg22-induced inhibition of seedling growth or inhibition of cell death. It remains to be determined whether other flg22-induced responses, such as pattern-triggered immunity (PTI), are affected by the phosphorylation status of Tyr-610. (C) Working model showing a link between BL signaling and plant defense involving Tyr-610 phosphorylation, which we speculate will also be impacted by plant protein tyrosine phosphatases (PTPs) and possibly bacterial effector proteins such as Pseudomonas HopAO1.