Hydrogen sulfide (H2S) in guard cell signaling

DENISE SCUFFI; ANA MARÍA LAXALT; DI FINO, LUCIANO M.; CARLOS GARCIA-MATA; MARIA PAPANTSIOU

Córdoba

Congreso; XXXII Reunión Argentina XVI Congreso Latinoamericano de Fisiología Vegetalecular Biology (; 2018

HYDROGEN SULFIDE (H2S)IN GUARD CELL SIGNALINGSCUFFI, Denise; DI FINO, Luciano; PANTALENO,Rosario; LAXALT, Ana; GARCÍA-MATA, CarlosInstituto de Investigaciones Biológicas, UniversidadNacional de Mar del Plata, Consejo Nacional deInvestigaciones Científicas y Técnicas, 7600 Mar del Plata,Argentina.camata@mdp.edu.arPlants regulate gas exchange through stomatal poresconformed by pairs of specialized cells, called guardcells (GCs). The GCs has the ability to sense multiple,both internal and external (environmental)stimuli, andrespond by adjusting the size of the stomatal porethrough variation of GC volume. This key physiologicalprocess is regulated by a complex signaling network.H2S is a signal molecule with ubiquitous participationin different physiological processes throughout thecycle of plant, among them the stomatal movementIn our lab we have reported the participation of H2S in stomatal closure induction in response to ABA and tomolecules derived from pathogens. We are now workingto elucidate the mechanisms and signaling compo- nents involved in H2S mediated response in guardcells. Using pharmacological and genetic tools, weidentified NO, ion channels, H2O2 and PhospholipaseD (PLD)-derived phosphatidic acid as downstream sig- naling components. In this talk I will summarize thecurrent knowledge on the role of H2S in guard cell sig- naling and discuss on our future perspectives.