期刊
PLANT MOLECULAR BIOLOGY
卷 91, 期 1-2, 页码 115-130出版社
SPRINGER
DOI: 10.1007/s11103-016-0446-y
关键词
Salinity resistance; ROS; Superoxide dismutase; NADPH oxidase; Redox homeostasis; Wheat
资金
- National Transgenic Project [2014ZX08002002-003]
- Natural Science Foundation of China [31171175]
Superoxide dismutase (SOD) is believed to enhance abiotic stress resistance by converting superoxide radical (O-2 (-)) to H2O2 to lower ROS level and maintain redox homeostasis. ROS level is controlled via biphasic machinery of ROS production and scavenging. However, whether the role of SOD in abiotic stress resistance is achieved through influencing the biophasic machinery is not well documented. Here, we identified a wheat copper-zinc (Cu/Zn) SOD gene, TaSOD2, who was responsive to NaCl and H2O2. TaSOD2 overexpression in wheat and Arabidopsis elevated SOD activities, and enhanced the resistance to salt and oxidative stress. TaSOD2 overexpression reduced H2O2 level but accelerated O-2 (-) accumulation. Further, it improved the activities of H2O2 metabolic enzymes, elevated the activity of O-2 (-) producer NADPH oxidase (NOX), and promoted the transcription of NOX encoding genes. The inhibition of NOX activity and the mutation of NOX encoding genes both abolished the salt resistance of TaSOD2 overexpression lines. These data indicate that Cu/Zn SOD enhances salt resistance, which is accomplished through modulating redox homeostasis via promoting NOX activity.
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