Atmospheric HS exposure does not affect stomatal aperture in maize.

Stomatal aperture in maize is not affected by exposure to a subtoxic concentration of atmospheric HS. At least in maize, HS, thus, is not a gaseous signal molecule that controls stomatal aperture. Sulfur is an indispensable element for the physiological functioning of plants with hydrogen sulfide (HS) potentially acting as gasotransmitter in the regulation of stomatal aperture.