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Mitogen‐activated protein kinases (MPKs) play essential roles in guard cell signaling, but whether MPK cascades participate in guard cell ethylene signaling and interact with hydrogen peroxide (H2O2), nitric oxide (NO), and ethylene‐signaling components remain unclear. Here, we report that ethylene activated MPK3 and MPK6 in the leaves of wild‐type Arabidopsis thaliana as well as ethylene insensitive2...