| Effects of exogenous nitric oxide on seed germination and reactive oxygen species metabolism of seedling leaves in ryegrass under osmotic stress |
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| DOI：10.7606/j.issn.1000-7601.2012.06.22 |
| Key Words: osmotic stress nitric oxide seed germination reactive oxygen species osmotica ryegrass |
| Author Name | Affiliation | | LIU Jianxin | Provincial Key Laboratory for Protection and Utilization of Longdong Bio-resources in Gansu Province, College of Life Science and Technology, Longdong University, Qingyang, Gansu 745000, China | | WANG Jincheng | Provincial Key Laboratory for Protection and Utilization of Longdong Bio-resources in Gansu Province, College of Life Science and Technology, Longdong University, Qingyang, Gansu 745000, China | | JIA Haiyan | Provincial Key Laboratory for Protection and Utilization of Longdong Bio-resources in Gansu Province, College of Life Science and Technology, Longdong University, Qingyang, Gansu 745000, China | | WANG Fengqin | Provincial Key Laboratory for Protection and Utilization of Longdong Bio-resources in Gansu Province, College of Life Science and Technology, Longdong University, Qingyang, Gansu 745000, China |
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| Abstract: |
| To discuss the regulating effect of exogenous nitric oxide(NO) on the physiological response of herbage under osmotie stress of simulated by polyethylene glycol, we investigated the effects of exogenous NO donor sodium nitro-prusside(SNP)on the seed germination, reactive oxygen species metabolism and osmotica accumulation in seedling leaves with the experimental materials of ryegrass(Lolium perenne L). The results showed that under the stress, applying 100μmol/L SNP increased significantly the seed germination rate, germination index, and vigor index, alleviated the de-creases of fresh and dry weights of whole plant, increased the activities of superoxide dismutase(SOD), guaiacol peroxi-dase(POD), ascorbate peroxidase(APX) and plasma membrane H+-ATPase and the contents of glutathione, soluble sugar, free
amino acid, proline, K+, and Na+ as well as plant water content, and decreased O2- production rate and the contents of H2O2, malondialdehyde and soluble protein in leaves. The results indicated that exogenous NO could promote the seed germination of ryegrass under osmotic stress and alleviate the membrane lipid peroxidation induced by osmotic stress in seedling leaves. |
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