%A YUE Hui-Fang, DUAN Li-Qing, LI Hai-Ping, ZHANG Li-Na, WANG Xiao-Li, ZHANG Zhi-Lin %T Changes in activities of protective enzymes in green poplar induced by exogenous jasmonic acid and the effects on larval development of the gypsy moth, Lymantria dispar (Lepidoptera: Lymantriidae) %0 Journal Article %D 2013 %J Acta Entomologica Sinica %R %P 270-275 %V 56 %N 3 %U {http://www.insect.org.cn/CN/abstract/article_5264.shtml} %8 2013-03-20 %X In order to investigate the resistance induced by exogenous jasmonic acid in Populus cathayana and the effects on development of the gypsy moth, Lymantria dispar, two concentrations of jasmonic acid solution (0.1 and 0.001 mmol/L) were sprayed onto green poplar seedlings while the control was sprayed with  0.17% acetone, the change in activities of protective enzymes in treated leaves was tested at 1, 5, and 10 d post JA treatment, and the developmental duration and body weight of L. dispar larvae on them were measured. The results showed that the activities of peroxidase (POD), polyphenol oxidase (PPO), phenylalanine ammonia-lyase (PAL), chymotrypsin inhibitor (CI) and trypsin inhibitor (TI) in leaves treated with two concentrations of jasmonic acid were significantly higher than that of the control (P<0.05). The developmental duration of L. dispar larvae fed on JA-induced green poplar seedlings was prolonged, while their body weight was reduced. The developmental duration of L. dispar larvae fed on 0.1 mmol/L JA-induced seedlings was 8 d longer than that of the control. The larval body weight of L. dispar measured at 21 d post JA treatment was decreased by 50%-100%. The results suggest that exogenous jasmonic acid could induce resistance in green poplar to L. dispar larvae.