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Phytohormones play an essential role in plant immune responses. Many phytopathogens secret effector proteins to promote infection and plant hormone signaling pathways are considered to be the potential targets of effectors. Here we found that abscisic acid (ABA) signaling was activated rapidly upon infection with  Pseudomonas syringae  pv.  tomato  ( Pst ).  Pst  secretes the effector AvrPtoB to target ABA 8′-hydroxylase CYP707As for degradation in  Arabidopsis thaliana . CYP707As hydroxylate ABA to an inactive form. The degradation of CYP707As resulted in ABA accumulation and  compromised plant immune responses. Our study demonstrated that  Pst  could hijack the key components of  Arabidopsis  ABA signaling pathway to cause disease.

The Pseudomonas syringae effector AvrPtoB targets abscisic acid signaling pathway to promote its virulence in Arabidopsis