摘要：To induce resistance of tomato plants against Tetranychus urticae Koch nine different compounds were used. The effect of these compounds on T. urticae , the essential oil components and defense enzymes activity in tomato leaves were determined. The highest reduction percentages of T. urticae movable stages recorded with potassium humates (55.38%) followed by salicylic acid, (Potassium humates+ Salicylic acid ), methyl jasmonate, potassium silicate, propolis and vital power calcio cao, (50.76, 47.34, 46.37, 37.81, 25.15 and 23.44%), respectively. The major components of essential oils in treated tomato leaves were Caryophyllene, Humulene, β-phellandrene, d-Limonene, cis-α-Copaene-8-ol, β-Spathulenol, Eugenol, 8-Cedren-13-ol, Spathulenol, Geraniol, Humulene epoxide II, Caryophyllene Oxide, Delta-elemene, Linalool, β-Elemene and Methyl salicylate. The levels of defense enzymes such as Catalase (CAT), Peroxidases (POD), Polyphenol oxidase (PPO), Phenylalanine ammonia lyase (PAL, β-glycosidase and inhibition (%) of the Proteinase inhibitors (PIs) were increased with most of treatments compared with untreated plant (control).While the levels of superoxide dismutase (SOD, glutathione-S-transferase (GST), acrobat peroxidase (APX) and lipoxygenase (LOXs) were increased with untreated plant (control). Potassium humates and Salicylic acid given highest anti- Tetranychus activity, enzymes one of the important aspects of Host Plant Resistance (HPR) against T. urticae . The treated tomato plants by different compounds showed defense response against herbivores and enhanced resistance against T. urticae and these results correlate with chemically determined such as essential oil components and defense enzymes.
