Abstract:In order to analyse the function of Laodelphax striatellus Fallén’s mucin gene against virus invasion, the relative expression level of mucin gene was evaluated by real-time fluorescence quantitative PCR. The expression level was not changed significantly when the L.striatellus were reared with RSV-infected leaves for 1 day or 2 days. However, when L.striatellus were reared for 3 days and 7 days, the expression level increased 3.60 and 1.97 folds. The relative expressions of mucin gene were 1.07, 1.12, 0.78 and 0.34 folds after L.striatellus were reared with healthy rice leaves for 1, 2, 3 and 7 days. After rearing with RSV-infected leaves for 1, 2, 3 and 7 days, the relative expression level of mucin gene were 1.15, 1.19, 3.19 and 1.01 folds, respectively. The results indicated that the expression level of mucin gene increased after RSV invasion. The mucin gene might play an import role in RSV and L.striatellus interaction.