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In this paper, using half a leaf blight method at present which are frequently used in the production of 6 kinds of virus chemicals in indoor biological activity tests, screening, it found that 6 kinds of chemicals to TMV were high, relatively speaking, the building has a higher resistance to TMV activity, living treatment under 1000 times liquid dose inhibition rate was 85.76%, under the condition of living passivation, inhibition rate reached 87.53%, under the condition of living protection inhibition rate reached 74.77%, at the same time building drug resistance to TMV extension effect is better also. In system test results found on the host: for the antivirus, anti poison feng, building drug control effect were 88.86%, 90.01% and 100%, respectively. This article has carried on the building control TMV and biochemical mechanism of preliminary study, proved that the building of doxycycline treatment after vaccination TMV heart leaf tobacco plant, POD activity, SOD activity, PAL activity, PPO activity and chlorophyll content and relevant enzyme and regulating the material in a certain period of time all have correlation. Building toxin induced resistance of the related enzyme activity increased obviously; Also induced the increase of chlorophyll content.
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