Spermidine-mediated hydrogen peroxide signaling enhances the antioxidant capacity of salt-stressed cucumber roots

Plant Physiology and Biochemistry : PPB
Jianqiang WuShi-Rong Guo

Abstract

Hydrogen peroxide (H2O2) is a key signaling molecule that mediates a variety of physiological processes and defense responses against abiotic stress in higher plants. In this study, our aims are to clarify the role of H2O2 accumulation induced by the exogenous application of spermidine (Spd) to cucumber (Cucumis sativus) seedlings in regulating the antioxidant capacity of roots under salt stress. The results showed that Spd caused a significant increase in endogenous polyamines and H2O2 levels, and peaked at 2 h after salt stress. Spd-induced H2O2 accumulation was blocked under salt stress by pretreatment with a H2O2 scavenger and respective inhibitors of cell wall peroxidase (CWPOD; EC: 1.11.1.7), polyamine oxidase (PAO; EC: 1.5.3.11) and NADPH oxidase (NOX; EC: 1.6.3.1); among these three inhibitors, the largest decrease was found in response to the addition of the inhibitor of polyamine oxidase. In addition, we observed that exogenous Spd could increase the activities of the enzymes superoxide dismutase (SOD; EC: 1.15.1.1), peroxidase (POD; EC: 1.11.1.7) and catalase (CAT; EC: 1.11.1.6) as well as the expression of their genes in salt-stressed roots, and the effects were inhibited by H2O2 scavengers and polyamine oxidase inh...Continue Reading

Citations

Jun 12, 2020·Functional Plant Biology : FPB·Natalia NapierajMa Gorzata Janicka
Sep 19, 2020·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Periyasamy RathinapriyaManikandan Ramesh
May 28, 2019·Frontiers in Plant Science·Wei WangJi-Hong Liu
Aug 8, 2020·Planta·Daniel Farias de OliveiraEnéas Gomes-Filho
Jan 27, 2021·Cell Biochemistry and Function·Seong-Hee Kang, Moon-Moo Kim
Feb 8, 2021·Ecotoxicology and Environmental Safety·Tarek A ShalabyAndré Rodrigues Dos Reis

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