Effects of Exogenous Salicylic Acid on Seed Germination and Physiological Characteristics of Oat Seedlings under Chromium Stress
In order to explore the alleviating effects of exogenous salicylic acid(SA)on the inhibition of chromium(Cr6+)stress to seed germination of oat(Avena sativa L.),the experiment was conducted by hydro-ponics method.Firstly,the optimal chromium concentration was selected as 100 mg/L,and then different con-centrations(0.01,0.02,0.03,0.04,0.08 and 0.10 mmol/L)of SA were set for seed soaking treatments.The seed soaking treatment with distilled water was set as control.The effects of different SA treatments on seed germination,seedling growth,activities of antioxidant enzymes,and contents of osmotic regulator substances and MDA were studied under 100 mg/L chromium stress.The results showed that seed germination and seed-ling growth of oat were significantly inhibited under the stress of 100 mg/L Cr6+.Exogenous SA significantly al-leviated the toxic effect of chromiumon seed germination and thus improved the seedling resistance through ac-tivating CAT,POD and SOD activities,reducing MDA content and increasing soluble sugar and proline con-tents.In the experiment conditions,0.03 mmol/L SA had better effect,which could obviously relieve the inhi-bition of chromium to oat seed germination,seedling growth and related physiological indicators.
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