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《Acta Photophysiologica Sinica》 2004-02
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Exogenous Nitric Oxide Alleviates Osmotic Stress-induced Membrane Lipid Peroxidation in Wheat Seedling Leaves

WANG Xian-Ye, SHEN Wen-Biao, XU Lang-Lai (College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China)  
Abstract:When wheat (Triticum aestivum L. Yangmai 158) seedling (with three fully expanded leaves) roots were treated with 15% PEG-6000 in combination with different concentrations (0.1 and 0.5 mmol/L) of exogenous nitric oxide donor sodium nitroprusside (SNP) and NO3-/NO2- (control), the enhancement of lipoxygenase (LOX) activity in wheat seedling leaves under osmotic stress was delayed at the lower concentration of SNP treatment (0.1 mmol/L) (Fig.2), while the generation rate of O2-, the enhancement of membrane permeability and the accumulation of MDA and H2O2 were also alleviated (Figs. 1,3). SNP 0.1 mmol/L significantly enhanced the activity of superoxide dismutase (SOD)(Fig.4), and accelerated the accumulation of proline (Fig.5). In comparison with these changes, the effects of higher concentration of SNP (0.5 mmol/L) and corresponding control (NO3-/NO2-) were not so obvious (Figs. 1-5). The above results indicate that lower concentrations of in vitro nitric oxide (NO) can protect wheat seedling leaves from membrane lipid peroxidation caused by osmotic stress.
【CateGory Index】: S512.1
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