Effects of Bacillus velezensis GZ8-6 on the enzyme activities in potato rhizosphere soil and potato growth
The purpose of this study was to test the effect of Bacillus velezensis on the enzyme activity of potato rhizosphere soil and potato growth.Potato seedlings were irrigated with suspension of Streptomyces scabies strain X-1,LB liquid medium and suspension of X-1 and Bacillus velezensis GZ8-6,respectively,the soil enzyme activities and the parameters related to potato growth during different time periods were measured and compared.The results showed that the activities of soil urease,sucrase,catalase and cellulase in the potato rhizosphere treated with suspension of X-1 and GZ8-6 were significantly higher than those treated with pathogen and LB liquid medium.Among which the soil sucrase activity reached the peak on day 30 and 60 after root-irrigation,1.70-fold and 2.71-fold higher than that of the pathogen treatment,respectively,the soil urease activity increased by 52.53％and 59.48％compared with pathogen treatment on day 10 and 20 after root-irrigation,and the soil cellulase and catalase activity showed a rising-falling-rising-falling trend during the potato growth period.After treated with suspension of X-1 and GZ8-6,the number of lateral root,stem width,underground weight and other growth indexes of potato were better than those treated with pathogen and LB liquid medium.The plant height and underground weight were increased by 34.65％and 124.79％compared with the pathogen treatment,60 d after root-irrigation,respectively,and the stem width was increased by 0.53 cm on average compared with the LB liquid medium treatment.Therefore,B.velezensis GZ8-6 not only promoted the growth of potato,but also improved the activity of key soil enzymes.
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