| Mitigative effects of exogenous salicylic acid on the inhibition of drought stress to wild Solanum nigrum seedlings |
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| DOI：10.7606/j.issn.1000-7601.2014.04.008 |
| Key Words: Solanum nigrum seedling drought stress salicylic acid mitigative effect |
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| Abstract: |
| By using 20% PEG6000 to simulate drought stress and spraying different concentrations (0, 0.5, 1.0, 1.5 mmol·L-1 and 2.0 mmol·L-1) of salicylic acid (SA), the effects of SA on growth of wild Solanum nigrum seedlings under drought stress were studied. The results showed that, under drought stress, the plant height, fresh weight and root length of Solanum nigrum seedlings were reduced, and the contents of chlorophyll and soluble protein were decreased, while the contents of proline and MDA and the activities of antioxidase were increased. When the Solanum nigrum seedlings under drought stress were treated by SA, the plant height, root length and fresh weight were substantially increased as compared with the control group (drought stress without SA). Especially under the treatment of 1.5 mmol·L-1 SA), they were increased by 20.8%, 28.0% and 29.7%, respectively. Compared with the control, the treatment of 1.5 mmol·L-1 SA increased the contents of chlorophyll, proline and soluble protein by 31.9%, 65.4% and 42.8% respectively, rais
ed the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) by 30.2%, 87.8% and 50.3% respectively, but decreased the content of malonaldehyde (MDA) by 37.8%. It was concluded that proper concentration of exogenous salicylic acid could mitigate the damage of drought stress on Solanum nigrum seedlings, and the effect of 1.5 mmol·L-1 SA was optimal. |
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