Effects Of Cadmium Stress On Brown Planthopper, Nilaparvata Lugens St(?)l.

This experiment was conducted to study the effects of different concentrations of cadmium stress in soil on larval survival, larval duration, wing dimorphism, female adult longevity and different proteins of two generations (F1 and F2) of the rice brown plant hopper (BPH), Nilaparvata lugens St?l. The results were as follows:Cadmium stress influenced the BPH, and had a dose-response. Compared with the control (0 mg/kg), there was no significant difference in larval survival or larval duration when the cadmium concentration was 2 mg/kg, but the ratio of macropterous forms to brachypterous forms and female adult longevity were increased significantly. Also, the ratio of macropterous forms to brachypterous forms of the F2 generation was significantly lower than that of the F1 generation. Larval survival, larval duration, the ratio of macropterous forms to brachypterous forms and female adult longevity were significantly reduced at cadmium concentrations of 4, 6 and 8 mg/kg, and similarly to the cadmium concentration of 2 mg/kg, the ratio of macropterous forms to brachypterous forms of the F2 generation was significantly lower than that of the F1 generation. When the cadmium concentration was 16 or 32 mg/kg, except for the larval duration lengthening, all of the other variables measured were reduced for the F1 generation and the F2 generation compared to the control. However, the larval survival of the F2 generation was higher than that of the F1 generation.Cadmium stress changed the proteome of female adult BPHs. There were various types of responsive proteins, which relate to hydrogen peroxide-induced injury in cells, DNA damage or repair, membrane permeability in cells, cellular structure, metabolism, signal transduction, cell division, protein synthesis, protein degradation and protein transformation. Some of the proteins poison cells, and others are for detoxification. At the concentrations of 4, 6 and 8 and 16 mg/kg of cadmium stress, toxicity was dominant. At the low concentration (2mg/kg) of cadmium stress, the organism itself had very good alexipharmic function, and toxicity was not obvious.In essence, high concentrations of cadmium in soil negatively affect the brown plant hopper, but at low concentrations of cadmium, the effects are not significant.