| Mitigative effects of exogenous nitric oxide on Pb2+ stress in maize seedlings |
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| DOI：10.7606/j.issn.1000-7601.2014.04.005 |
| Key Words: maize exogenous nitric oxide Pb2+ stress mitigative damage |
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| Abstract: |
| The pot experiment was conducted to investigate the effects of exogenous nitric oxide (NO) on the growth and physiological characteristics of maize (Zea mays) seedlings under Pb2+ stress. The results demonstrated that, after treated with 1.0 mmol·L-1 Pb2+, the growth of maize seedlings was inhibited, the accumulation of soluble protein and soluble sugar was slowed down, the activity of antioxidant enzymes and chlorophyll content were declined, while the MDA content and membrane permeability were increased. When 0.1 mmol·L-1 SNP was supplied, the inhibition effect of Pb2+ to the growth of seedlings was significantly relieved, the activity of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) was increased, the content of chlorophyll and proline (Pro) was increased, the accumulation of soluble sugar and soluble protein was promoted, and the MDA content and membrane permeability were declined. Therefore, exogenous NO has a significantly alleviatory effect on the growth of Pb2+ stressed maize seedlings, and may enhance the Pb2+ resistance of maize seedlings. |
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