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Plant function and evolutionary biology
RESEARCH ARTICLE

Hydrogen sulfide may function downstream of hydrogen peroxide in mediating darkness-induced stomatal closure in Vicia faba

Yinli Ma A C , Jiao Niu A , Wei Zhang A and Xiang Wu B
+ Author Affiliations
- Author Affiliations

A School of Life Sciences, Shanxi Normal University, Gongyuan Street No. 1, Linfen 041004, China.

B Hanzhong Forestry Science Research Institute, Zhengjiaba, Hanzhong 723000, China.

C Corresponding author. Email: mayinli1978@163.com

Functional Plant Biology 45(5) 553-560 https://doi.org/10.1071/FP17274
Submitted: 3 October 2017  Accepted: 21 November 2017   Published: 14 December 2017

Abstract

The relationship between hydrogen sulfide (H2S) and hydrogen peroxide (H2O2) during darkness-induced stomatal closure in Vicia faba L. was investigated by using pharmacological, spectrophotographic and lasers canning confocal microscopic approaches. Darkness-induced stomatal closure was inhibited by H2S scavenger hypotaurine (HT), H2S synthesis inhibitors aminooxy acetic acid (AOA) and hydroxylamine (NH2OH) and potassium pyruvate (N3H3KO3) and ammonia (NH3), which are the products of L-/D-cysteine desulfhydrase (L-/D-CDes). Moreover, darkness induced H2S generation and increased L-/D-CDes activity in leaves of V. faba. H2O2 scavenger and synthesis inhibitors suppressed darkness-induced increase of H2S levels and L-/D-CDes activity as well as stomatal closure in leaves of V. faba. However, H2S scavenger and synthesis inhibitors had no effect on darkness-induced H2O2 accumulation in guard cells of V. faba. From these data it can be deduced that H2S is involved in darkness-induced stomatal closure and acts downstream of H2O2 in V. faba.

Additional keywords: D-/L-cysteine, darkness, desulfhydrase, gasotransmitter, hydrogen sulphide, physiological and biochemical mechanisms.


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