Ethylene and Sulfur Coordinately Modulate the Antioxidant System and ABA Accumulation in Mustard Plants under Salt Stress

Fatma, Mehar and Iqbal, Noushina and Gautam, Harsha and Sehar, Zebus and Sofo, Adriano and D’Ippolito, Ilaria and Khan, Nafees A. (2021) Ethylene and Sulfur Coordinately Modulate the Antioxidant System and ABA Accumulation in Mustard Plants under Salt Stress. Plants, 10 (1). p. 180. ISSN 2223-7747

[thumbnail of plants-10-00180-v2.pdf] Text
plants-10-00180-v2.pdf - Published Version

Download (3MB)

Abstract

This study explored the interactive effect of ethephon (2-chloroethyl phosphonic acid; an ethylene source) and sulfur (S) in regulating the antioxidant system and ABA content and in maintaining stomatal responses, chloroplast structure, and photosynthetic performance of mustard plants (Brassica juncea L. Czern.) grown under 100 mM NaCl stress. The treatment of ethephon (200 µL L−1) and S (200 mg S kg−1 soil) together markedly improved the activity of enzymatic and non-enzymatic components of the ascorbate-glutathione (AsA-GSH) cycle, resulting in declined oxidative stress through lesser content of sodium (Na+) ion and hydrogen peroxide (H2O2) in salt-stressed plants. These changes promoted the development of chloroplast thylakoids and photosynthetic performance under salt stress. Ethephon + S also reduced abscisic acid (ABA) accumulation in guard cell, leading to maximal stomatal conductance under salt stress. The inhibition of ethylene action by norbornadiene (NBD) in salt- plus non-stressed treated plants increased ABA and H2O2 contents, and reduced stomatal opening, suggesting the involvement of ethephon and S in regulating stomatal conductance. These findings suggest that ethephon and S modulate antioxidant system and ABA accumulation in guard cells, controlling stomatal conductance, and the structure and efficiency of the photosynthetic apparatus in plants under salt stress.

Item Type: Article
Uncontrolled Keywords: antioxidant; ascorbate-glutathione; ethylene; photosynthesis; salt stress; sulfur
Subjects: STM Repository > Biological Science
Depositing User: Managing Editor
Date Deposited: 28 Feb 2023 09:31
Last Modified: 25 May 2024 07:50
URI: http://classical.goforpromo.com/id/eprint/946

Actions (login required)

View Item
View Item