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Plant function and evolutionary biology
RESEARCH ARTICLE

Hydrogen sulfide may function downstream of hydrogen peroxide in salt stress-induced stomatal closure in Vicia faba

Yinli Ma A B , Wei Zhang https://orcid.org/0000-0001-8355-5738 A , Jiao Niu A , Yu Ren A and Fan Zhang A
+ Author Affiliations
- Author Affiliations

A School of Life Sciences, Shanxi Normal University, Linfen 041004, China.

B Corresponding author. Email: mayinli1978@163.com

Functional Plant Biology 46(2) 136-145 https://doi.org/10.1071/FP18096
Submitted: 13 April 2018  Accepted: 3 September 2018   Published: 17 October 2018

Abstract

The roles of hydrogen sulfide (H2S) and hydrogen peroxide (H2O2) in signalling transduction of stomatal closure induced by salt stress were examined by using pharmacological, spectrophotographic and laser scanning confocal microscopic (LSCM) approaches in Vicia faba L. Salt stress resulted in stomatal closure, and this effect was blocked by H2S modulators hypotaurine (HT), aminooxy acetic acid (AOA), hydroxylamine (NH2OH), potassium pyruvate (C3H3KO3) and ammonia (NH3) and H2O2 modulators ascorbic acid (ASA), catalase (CAT), diphenylene iodonium (DPI). Additionally, salt stress induced H2S generation and increased L-/D-cysteine desulfhydrase (L-/D-CDes, pyridoxalphosphate-dependent enzyme) activity in leaves, and caused H2O2 production in guard cells, and these effects were significantly suppressed by H2S modulators and H2O2 modulators respectively. Moreover, H2O2 modulators suppressed salt stress-induced increase of H2S levels and L-/D-CDes activity in leaves as well as stomatal closure of V. faba. However, H2S modulators had no effects on salt stress-induced H2O2 production in guard cells. Altogether, our data suggested that H2S and H2O2 probably are involved in salt stress-induced stomatal closure, and H2S may function downstream of H2O2 in salt stress-induced stomatal movement in V. faba.

Additional keywords: broad bean, desulfhydrase, D-/L-cysteine, gasotransmitter, hydrogen sulphide, physiological and biochemical mechanisms, salt stress.


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