Hydrogen Peroxide and Strigolactones Signaling Are Involved in Alleviation of Salt Stress Induced by Arbuscular Mycorrhizal Fungus in Sesbania cannabina Seedlings

• Published in: Journal of plant growth regulation Vol. 36; no. 3; pp. 734 - 742
• Main Authors: Kong, Cun-Cui, Ren, Cheng-Gang, Li, Run-Zhi, Xie, Zhi-Hong, Wang, Ji-Ping
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.09.2017; Springer Nature B.V
• Subjects: Abiotic stress; Agriculture; Arbuscular mycorrhizas; Bioassays; Biomedical and Life Sciences; Fungi; Germination; Host plants; Hydrogen peroxide; Life Sciences; NAD(P)H oxidase; Oxidase; Plant Anatomy/Development; Plant growth; Plant Physiology; Plant Sciences; Plants (botany); Salinity tolerance; Salt; Salt tolerance; Salts; Scavenging; Seedlings; Sodium chloride; Stress; Stresses; Symbiosis; Arbuscular mycorrhizal; Strigolactones; Salt stress; Hydrogen peroxide; NADPH oxidase
• ISSN: 0721-7595; 1435-8107
• DOI: 10.1007/s00344-017-9675-9

The arbuscular mycorrhizal symbiosis can alleviate salt stress in plants by altering strigolactone levels in the host plant. The aim of this study was to investigate the mechanism by which strigolactones enhance salt stress tolerance in arbuscular mycorrhizal Sesbania cannabina seedlings. Strigolactone levels, as determined by means of germination bioassay, gradually increased with treatment time of NaCl applied. Inhibition of NADPH oxidase activity and chemical scavenging of H 2 O 2 significantly reduced strigolactone-induced salt tolerance and decreased strigolactone levels. The H 2 O 2 -induced strigolactone accumulation was accompanied by increased tolerance to salt stress. These results strongly indicated that elevated H 2 O 2 concentration resulting from enhanced NADPH oxidase activity regulated strigolactone-induced salt stress tolerance in arbuscular mycorrhizal S. cannabina seedlings.