关键词: 寄主植物代谢物, 沙葱萤叶甲, 取食量, 取食偏好

Abstract: 【Objective】To reveal the effects of host plant metabolites on the feeding intake and preference of Galeruca daurica.【Methods】6 metabolites of the host plant of G. daurica（including 3 secondary metabolites,namely isoquercitrin,isoflavone and rutin,respectively,and 3 primary metabolites,namely D-galactose,β-D-glucose and L-rhamnose）were selected,and soaked in 10% DMSO solution to prepare 6 metabolite treatment solutions of 0.01 mmol/L（low concentration）,0.10 mmol/L （medium concentration）,and 1.00 mmol/L（high concentration） in chives,to feed G. daurica. The treatment soaked in 10% DMSO solution in chives was used as the control group. The food intake of different host metabolites by G. daurica（larvae,adults） was measured. The binomial leaf dish selection method was used to study the feeding preference on different host plant metabolites and different concentration treatment groups.【Results】The food intake of larvae on the high concentration isoquercetin treatment was significantly less than control（P<0.05）,whereas the food intakes of larvae on the middle and high concentration L-rhamnose treatments were significantly more than control（P<0.05）. The food intakes of adults on the low and middle concentration isoflavone,and low and high concentration L-rhamnose treatments were significantly more than control（P<0.05）. The feeding preference of larvae on the middle and high concentration isoflavone,high concentration rutin,and low concentration β-D-glucose treatments were significantly less than control（P<0.05）,whereas the feeding preference of larvae on the low concentration L-rhamnose treatment was extremely significantly more than control（P<0.01）. The feeding preference of adults on the high concentration isoquercetin treatment group was extremely significantly more than control（P<0.01）,whereas the feeding preference indices of adults on the high concentration isoflavone,rutin and D-galactose treatments were much significantly less than control（P<0.01）.【Conclusion】Effects of host plant metabolites on feeding by G. daurica depend on their kinds,contents,and developmental stages of G. daurica.

Key words: Host plant metabolites, Galeruca daurica, Food intake, Feeding preference