title: Hydrogen sulfide interacting with abscisic acid in stomatal regulation responses to drought stress in Arabidopsis.
abstract: Hydrogen sulfide (H(2)S) plays a crucial role in the regulation of stomatal closure in plant response to drought stress, and l-cysteine desulfhydrase (LCD) has been identified as being mainly responsible for the degradation of cysteine to generate H(2)S. In view of the similar roles to abscisic acid (ABA), in this study, the lcd, aba3 and abi1 mutants were studied to investigate the close inter-relationship between H(2)S and ABA. The lcd mutant showed enlarged stomatal aperture and more sensitivity to drought stress than wild-type plants. Expression of Ca(2+) channel and outward-rectifying K(+) channel coding genes decreased in the lcd mutant, and conversely, expression of inward-rectifying K(+) increased. The stomatal aperture of aba3 and abi1 mutants decreased after treatment with NaHS (a H(2)S donor), but stomatal closure in responses to ABA was impaired in the lcd mutant. The expression of LCD and H(2)S production rate decreased in both the aba3 and abi1 mutants. Transcriptional expression of ABA receptor candidates was upregulated in the lcd mutant and decreased with NaHS treatment. The above results suggested that H(2)S may be an important link in stomatal regulation by ABA via ion channels; H(2)S affected the expression of ABA receptor candidates; and ABA also influenced H(2)S production. Thus, H(2)S interacted with ABA in the stomatal regulation responsible for drought stress in Arabidopsis.
authors.affiliation: School of Life Science, Shanxi University, Taiyuan 030006, China.
authors.forename: Zhuping
authors.initials: Z
authors.lastname: Jin
authors.forename: Shaowu
authors.initials: S
authors.lastname: Xue
authors.forename: Yanan
authors.initials: Y
authors.lastname: Luo
authors.forename: Baohua
authors.initials: B
authors.lastname: Tian
authors.forename: Huihui
authors.initials: H
authors.lastname: Fang
authors.forename: Hua
authors.initials: H
authors.lastname: Li
authors.forename: Yanxi
authors.initials: Y
authors.lastname: Pei
mesh_terms: D000040:Abscisic Acid / Q000235:genetics / Q000378:metabolism*; D017360:Arabidopsis / Q000235:genetics / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000096:biosynthesis / Q000235:genetics; D003545:Cysteine / Q000235:genetics / Q000378:metabolism*; D018506:Gene Expression Regulation, Plant / Q000502:physiology; D006862:Hydrogen Sulfide / Q000378:metabolism*; D009154:Mutation; D054046:Plant Stomata / Q000235:genetics / Q000378:metabolism*; D013312:Stress, Physiological / Q000502:physiology*
chemical_list: D029681:Arabidopsis Proteins; D000040:Abscisic Acid; D003545:Cysteine; D006862:Hydrogen Sulfide