Abstract:

The biocontrol strains were screened which had strong inhibitory activity against Phytophthora capsici, in order to control pepper plague. A large number of microorganisms were isolated from soil of pepper growing areas, and a bacterium named XD6 which having strong antagonistic effect on Phytophthora capsici by plate confrontation was obtained. Through methods of traditional and 16SrDNA, the status of category was identified, and then the change the activity of the related-enzymes was measured. The control effect of the strain was 80%-100% in plate confrontation experiment, and was primarily identified as Paenibacillus polymyxa. The result of the activity of the enzymes showed that it had significant change in β-1,3-glucanase and cellulose, and the activity of PAL, PPO and POD was significantly increased before XD6 was inoculated in pepper. The XD6 strain had high efficiency to Phytophthora capsici. The biocontrol factors of XD6 could impose on cell wall of Phytophthora capsici, and XD6 strain could increase the defense enzymes of the pepper. The strain had a great potential in research prospect.