Abstract: 【Objective】The objective of this study is to clarify the physiological characteristic changes inside the leaves of tomato between the resistance and the susceptible cultivars under the stresses of Bemisia tabaci B biotype, and to provide a reference for the breeding and popularization of tomato varieties resistant to B. tabaci.【Method】 An experiment was carried out under artificial climate conditions. The resistant variety (Hongshengnv, HSN) and the susceptible variety (Huangshengguo, HSG) were infested by B. tabaci B biotype in a no-choice way. The contents variation of the secondary metabolic materials (i.e., sucrose esters, gallic acid, caffeic acid, ferulic acid, benzoic acid, salicylic acid, lignin), the changes of some protective enzymes activities (i.e., POD, CAT, PPO, LOX) and trypsin proteinase inhibitor activity (TI), the value variation of two photosynthetic parameters (i.e., Fv/Fm, Fv/Fo), the changes of cell membrane lipid peroxidation (i.e. H₂O₂ content, production rate, MDA content and electric conductivity (EC)), were determined all together at the same time.【Result】There were marked differences in the contents of the SE, phenolic acids, lignin, H₂O₂, and MDA between the HSN and the HSG. Meanwhile, the differences of the activities of TI and protective enzymes, the values of Fv/Fo, were also significant between these two varieties. However, the value differences of these parameters, such as Fv/Fm, production rate, and EC, were not obvious. The two varieties showed different responses to the infestation of B. tabaci B biotype. For example, after 9 h, the contents of sucrose esters, phenolic acids, and lignin as well as the activities of protective enzymes increased all together. However, there were considerable raises as to its extent with comparing HSN to the HSG. Photosynthesis was inhibited in the leaves, confirmed by the observation of reducing of the activities of TI and photosynthetic parameter values. There were reducing to lower intensities with comparing the HSN to the HSG. More active oxygen, MDA and EC found in the latter indicated that HSG cell had been damaged greatly.【Conclusion】There were different responses to the stresses of B. tabaci B biotype as to tomato of different resistant varieties. Higher variation of secondary metabolic materials contents and protective enzymes activities were observed in the resistant variety. Meanwhile, the photosynthetic parameter values, active oxygen content, cell membrane lipid peroxidation, as well as the TI activities changed more dramatically in the susceptible variety.

Key words: Lycopersicon esculentum, resistant varieties, Bemisia tabaci B biotype, stress, physiological characteristics