Abstract
To understand the mechanism of soil microbial ecosystem and biochemical properties in suppressing soilborne plant diseases, the relationship between the soil rhizosphere microbial communities, hydrolase activities, and different disease-resistant cultivars was investigated. There were statistically significant differences in microbial diversity in the rhizosphere soil between the disease-tolerant cultivar Fj01 and susceptible cultivar Baxi. The rhizosphere soil of Fj01 showed a trend of higher microbial diversity than that of Baxi. At the same growth stage, the similar trends of variation in microbial community diversity between the two different cultivars were observed. The bacterial community abundance in rhizosphere soil from the two banana cultivars was quantified by real-time PCR assays. The size of the rhizosphere bacterial population from the Fj01 was significantly larger than that from the Baxi during the growing stage from July to September. The activities of urease and phosphatase were analyzed to study the effects of the two banana cultivars to soil ecosystem functioning. Urease activity was significantly higher in the rhizosphere soil of Fj01 than that of Baxi in the period from July to September. However, phosphatase activity showed no significant difference between the two different rhizosphere soils.
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