Hydrogen sulfide mediates ion fluxes inducing stomatal closure in response to drought stress in Arabidopsis thaliana

Background and aims In many plant species, hydrogen sulfide (H2S) triggers stomatal closure, which is produced mainly by two classes of enzymes, cysteine desulfhydrases (CDes) and O-acetyl-L-serine (thiol) lyases (OASTLs). Stomatal movement is accompanied by several ion fluxes across the plasma membranes of guard cells.