Gasotransmitters are emerging as new guard cell signaling molecules and regulators of leaf gas exchange

► Gasotransmitters emerged as a new group of signaling components. ► Gasotransmitters are endogenously synthesized in plants. ► Stomatal pore regulation is a key process of plant physiology. ► Stomatal guard cells are a model system for plant signaling. ► Gasotransmitters have an active role in stomatal aperture regulation, acting in an ABA-dependent or independent manner.