Effect of Silicon Application on Sclerotinia Sclerotiorum Resistance and Antioxidant Enzyme Activities in Oilseed Rape
In order to clarify the effect of exogenous silicon on disease resistance and antioxidant en-zyme activity of rapeseed under Sclerotinia sclerotiorum infection,At the first flowering stage,Sclero-tinia sclerotiorum mycelium block was inoculated on different resistant oilseed rape cultivars,which were sprayed with silicon and clean water,disease indices and antioxidant enzyme activities were then determined.The results showed that the disease index of Sclerotinia sclerotiorum could be effectively reduced by using resistant varieties and applying exogenous silicon.After Sclerotinia sclerotiorum in-fection,there were significant differences in the activities of POD,PPO,PAL and SOD among differ-ent varieties,silicon treatments and combinations.The results showed that the disease indexes of u-sing resistant varieties and applying exogenous silicon were significantly lower than other treatments at different time periods.There were significant differences in the activities of POD,PPO,PAL and SOD enzymes among the different varietal resistance treatments,silicon application treatments and each combination of treatments after botrytis infestation,and the peak activities of all four antioxidant enzymes of the disease-resistant varieties and exogenous silicon applied synergistically were signifi-cantly higher than those of the other treatments,and the rate of growth of antioxidant enzyme activi-ties was also significantly higher than that of the other treatments.The application of exogenous sili-con and the use of resistant rape varieties could effectively inhibit the infection and expansion of Scle-rotinia sclerotiorum.This study laid a foundation for the integrated control of Sclerotinia sclerotio-rum.
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维普
