The Effect and Mechanism of Silicon on Sorghum Seedlings Growth Under Cadmium Stress
Although the effects of silicon on cadmium resistance are wildly reported,the underlying mecha nism is still unclear.In the present study,we investigated the effect and mechanism of silicon on sorghum seedling growth under cadmium stress.The result indicated silicon application alleviated cadmium-induced decrease in fresh weight and dry weight both of shoot and root.The result indicated that the anti-oxidant enzyme activity was not affected by silicon under control condition.However under cadmium stress,the CAT and POD activity were significantly increased by silicon.The SOD activity was not influenced by silicon.Corresponding to this result,MDA was decreased by silicon.The result indicated that 3 types of organic acids (OA) including oxalic acid,propanedioic acid and succinic acid were detected in leaf.All of them were increased by silicon under cadmium stress.In the root,4 types of OA such as oxalic acid,malic acid,propanedioic acid and citric acid were detected.Oxalic acid and propanedioic acid contents were increased by silicon.Citric Acid content was not influenced by silicon.However,the malic acid was decreased by silicon.All of the results indicated that the enhancement of anti-oxidant enzyme activity and OA content involved in the silicon-induced sorghum seedlings cadmium resistance.
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