Hydrogen Sulfide in Guard Cell Signaling

Abstract

lants regulate gas exchange through stomatal pores conformed by pairs of specialized cells, called guard cells (GCs). The GCs has the ability to sense multiple, both internal and external (environmental), and respond by adjusting the size of the stomatal pore through variation of GC volume. This key physiological process is regulated by a complex signaling network. H2S is a signal molecule with ubiquitous participation in different physiological processes throughout the cycle of plant, among them the stomatal movement. This chapter highlights the participation of H2S as an active component in the signaling processes that command stomatal behavior in response to different stimuli.