title: Hydrogen sulphide, a novel gasotransmitter involved in guard cell signalling.
abstract: Hydrogen sulphide (H(2) S) has been proposed as the third gasotransmitter. In animal cells, H(2) S has been implicated in several physiological processes. H(2) S is endogenously synthesized in both animals and plants by enzymes with l-Cys desulphydrase activity in the conversion of l-Cys to H(2) S, pyruvate and ammonia. The participation of H(2) S in both stomatal movement regulation and abscisic acid (ABA)-dependent induction of stomatal closure was studied in epidermal strips of three plant species (Vicia faba, Arabidopsis thaliana and Impatiens walleriana). The effect of H(2) S on stomatal movement was contrasted with leaf relative water content (RWC) measurements of whole plants subjected to water stress. In this work we report that exogenous H(2) S induces stomatal closure and this effect is impaired by the ATP-binding cassette (ABC) transporter inhibitor glibenclamide; scavenging H(2) S or inhibition of the enzyme responsible for endogenous H(2) S synthesis partially blocks ABA-dependent stomatal closure; and H(2) S treatment increases RWC and protects plants against drought stress. Our results indicate that H(2) S induces stomatal closure and participates in ABA-dependent signalling, possibly through the regulation of ABC transporters in guard cells.
authors.affiliation: Instituto de Investigaciones Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata - CONICET, CC1245 (7600) Mar del Plata, Argentina.
authors.forename: Carlos
authors.initials: C
authors.lastname: García-Mata
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Lamattina
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000037:antagonists & inhibitors / Q000378:metabolism; D000040:Abscisic Acid / Q000494:pharmacology; D055864:Droughts; D005905:Glyburide / Q000494:pharmacology; D006862:Hydrogen Sulfide / Q000378:metabolism* / Q000494:pharmacology; D029069:Impatiens / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D054046:Plant Stomata / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D024661:Potassium Channels, Inwardly Rectifying / Q000037:antagonists & inhibitors / Q000378:metabolism; D011955:Receptors, Drug / Q000037:antagonists & inhibitors / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects; D013312:Stress, Physiological / Q000187:drug effects; D064233:Sulfonylurea Receptors; D031307:Vicia faba / Q000166:cytology / Q000187:drug effects / Q000378:metabolism
chemical_list: D018528:ATP-Binding Cassette Transporters; D024661:Potassium Channels, Inwardly Rectifying; D011955:Receptors, Drug; D064233:Sulfonylurea Receptors; D000040:Abscisic Acid; D005905:Glyburide; D006862:Hydrogen Sulfide