Abstract:To understand the effects of different concentrations of methyl jasmonate (MeJA) on the resistance of wheat seeding against stripe rust caused by Pucciniastriiformis f.sp. tritici (Pst), wheat seedling was inoculated with Pst after spraying with different concentrations of MeJA. The inducing effect was observed in the resistance to stripe rust pretreated with MeJA at the concentration of 2.00 mmol·L-1 with the effect reached to 35.87%, MeJA could inhibit the germination of urediniospore significantly at the concentration of 0.50 mmol·L-1 after 4 hours inoculation. Ultrastructure of intercellular hyphae, haustorium, and haustorial mother cells were significantly inhibited. A series of changes associated with resistance to infection were reported. Our results indicated that the resistance of wheat seedling against Pst was induced after MeJA treatment.