Hydrogen sulfide in guard cell signaling

SCUFFI, DENISE; DI FINO, LUCIANO; LAXALT, ANA MARÍA; GARCÍA-MATA, CARLOS

Cordoba

Congreso; XXXII Reunion Argentina de Fisiologia Vegetal (RAFV); 2018

SAFV

Plants 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) stimuli, 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.Hydrogen sulfide (H2S) is a small gaseous signaling molecule with ubiquitous participation in different physiological processes throughout the cycle of plant, among them the stomatal movement.In our lab we have reported the participation of H2S in stomatal closure induction in response to Abscisic acid (ABA) and to molecules derived from pathogens. We are now working to elucidate the mechanisms and signaling components involved in H2S mediated response in guard cells. Using pharmacological and genetic tools, we identified nitric oxide (NO), ion channels, H2O2 and Phospholipase D (PLD)-derived phosphatidic acid as downstream signaling components.In this talk I will summarize the current knowledge on the role of H2S in guard cell signaling and discuss on our future perspectives.