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Mitogen‐activated protein kinase (MAPK) cascades play pivotal roles in plant defense against phytopathogens downstream of immune receptor complexes. The amplitude and duration of MAPK activation must be strictly controlled, but the underlying mechanism remains unclear. Here, we identified Arabidopsis CPL1 (C‐terminal domain phosphatase‐like 1) as a negative regulator of microbe‐associated molecular...