Effects of Exogenous Selenium on Rice Growth and Survival of Sogatella furcifera(Hemiptera:Delphacidae)
To explore the effects of exogenous selenium(Se)on rice growth and survival of Sogatella furcifera feeding on Se-treated rice plants,a susceptible cultivar'Taichung Native 1'(TN1)was served as the test rice variety.Six Se concentrations of 10,20,30,40,50 and 60 μmol/L were set up by adding sodium selenite(Na2SeO3)to the nutrient solution,and 0 μmol/L was used as the control to determine the effects of different concentrations of Se on rice growth and the survival of S.furcifera feeding on Se-treated rice plants.The results indicated that the plant height,root length,fresh weight and dry weight per plant treated with 10 μmol/L Se were significantly higher than that of control;while the plant height,root length,fresh weight and dry weight per plant treated with 20-60 μmol/L Se were lower than that of control.Se content in rice plants were increased significantly with the increase of Se concentration in nutrient solution,while survival rate of S.furcifera were decreased significantly with the increase of Se content in rice plants.The survival rate of S.furcifera fedding on rice plants treated with 10 μmol/L Se decreased significantly on the 4th to 7th day after the treatment.In conclusion,10 µmol/L is the appropriate concentration of Se,which can promote rice growth and reduce the survival rate of S.furcifera.
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