The effect of methyl jasmonate in antibiosis resistance of wheat to the Russian wheat aphid

In this investigation، three concentrations of methyl Jasmonate، MeJa (0. 01، 0. 1 and 1 mM) and the control (distilled water، ethanol 96% and Tween-20 in foliar spray method، distilled water and ethanol 96% in seed priming method) with two different methods of foliar application and seed priming was used and their effects on wheat (cv. Sardari) resistance to the Russian wheat aphid، Diuraphis noxia (Hemiptera: Aphididae)، was investigated. Analysis of variance indicated that the total nymphal development time was increased significantly in the 0. 01 and 1 mM MeJa treated plants in foliar spray method. In seed priming method، the 1 mM MeJa significantly increased the total nymphal development time. Additionally، the pre-reproductive period was lengthened in plants treated with 0. 1 mM MeJa in comparison with the control plants in foliar spray method. Moreover، in both methods، the reproductive period was significantly short on all the treated plants compared to the control plants. There was no significant difference in post- reproductive period between the treatments and the control in the both methods. Further، the mean number of offspring produced per female was significantly less on all treated plants than that on control plants in both methods. Furthermore، all the concentrations of MeJa reduced the total longevity in foliar spray method. In seed priming method، the total longevity was significantly short on 0. 1 and 1 mM MeJa treated plants compared to the control plants.