Biologia plantarum 62:750-762, 2018 | DOI: 10.1007/s10535-018-0808-1

Apoplastic hydrogen peroxide and superoxide anion exhibited different regulatory functions in salt-induced oxidative stress in wheat leaves

Q. Li1, L. R. Lv1, Y. J. Teng1, L. B. Si1, T. Ma1, Y. L. Yang1,*
1 School of Life Science, Northwest Normal University, Lanzhou, P.R. China

The present work aimed to investigate the mechanisms of nitric oxide (NO) and reactive oxygen species (ROS) generations and to explore their roles in the regulation of antioxidative responses in the wheat leaves under salinity. Except for an insignificant change of NO content and nitrate reductase (NR) activity due to 50 mM NaCl, NO, hydrogen peroxide, superoxide anion (O2*- ), hydroxyl radical (*OH), chlorophyll and malondialdehyde content, as well as activities of nitric oxide synthase, NR, peroxidases (POD), catalase (CAT), and ascorbate peroxidase rose in response to different NaCl concentrations. Meanwhile, leaf superoxide dismutase activity lowered only at 50 mM NaCl. NaClstimulatory effects on NO content as well as POD and CAT activities could be partly alleviated by the application of 2-phenyl-4,4,5,5-tetrame-thylimidazoline-3-oxide-1-oxyl (PTIO, NO scavenger), exogenous CAT, or diphenylene iodonium (DPI, NADPH oxidase inhibitor). Native polyacrylamide gel electrophoresis (native-PAGE) also showed that the amount of POD (especially POD4, POD5, and POD7) and CAT (especially CAT1, CAT2, and CAT3) isozymes increased with increasing salinity but decreased by application of PTIO, CAT, or DPI. Furthermore, histochemical staining showed a similar change of O2*- generation. In addition, the inhibition of diamineoxidase (DAO), polyamine oxidase (PAO), and cell wall-bound POD (cw-POD) activities in NaCl-stressed seedlings seemed to be insensitive to the application of PTIO or DPI. Taken together, salinity-induced NO, H2O2, and O2*- generation influenced each other and played different roles in the regulation of antioxidant enzyme activities in the leaves of wheat seedlings under NaCl treatment.

Keywords: antioxidants; nitric oxide; reactive oxygen species; salinity; Triticum aestivum
Subjects: hydrogen peroxide; superoxide anion; salt stress; nitric oxide; nitric oxide synthase; nitrate reductase; malondialdehyde; antioxidant enzymes; peroxidases; catalase; wheat
Species: Triticum aestivum

Received: August 23, 2017; Revised: March 3, 2018; Accepted: March 21, 2018; Published: August 1, 2018Show citation

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Li, Q., Lv, L.R., Teng, Y.J., Si, L.B., Ma, T., & Yang, Y.L. (2018). Apoplastic hydrogen peroxide and superoxide anion exhibited different regulatory functions in salt-induced oxidative stress in wheat leaves. Biologia plantarum, 62(4), 750-762. doi: 10.1007/s10535-018-0808-1.
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