Analysis of Sogatella furcifera (Horvath) soluble proteins by SDS-PAGE

The soluble proteins from nymphs and adults of Sogatella furcifera were analyzed by SDS-PAGE. The number of protein bands increased gradually as the nymphs developing, such as six and 14 protein bands were found in 3-instar nymphs and 5-instar nymphs respectively. At the same time, we found that three bands expressed in each instar, two bands began to appear from 4-instar, and six bands were specific in 5-instar. There were four bands that their content in 5-instar nymphs with long-winged disc was at least 65.61% higher than in 5-instar nymphs with short-winged disc. There were 13 protein bands observed in male adults, while female adults had 13 corresponding protein bands and a specific band expressed only in tissue. Comparing between two wing-type adults, four bands were specific to long-winged adults, while the content of other three bands in long-winged adults was at least 72.54 % higher than in short-winged adults. Finally, these specific protein bands associated with wing or sex were discussed what kind role they played in wing or sexual differentiation. The results will be helpful to further explore the mechanism of wing or sexual differentiation about planthoppers.