Identification and Practical Application of Silicate-dissolving Bacteria

Slime-forming bacteria were isolated from soils, rock surface and earthworm intestine, and their effects on dissolving silicate minerals and tomato growth were examined. One of the bacteria, Bacillus mucilaginosus RGBc13, had particularly strong ability to form slime and dissolve silicates. RGBc13 could also colonize and develop in both non-rhizosphere and rhizosphere soil. Total number of slime-forming bacteria increased from 2.9 × 103 cfu·g-1and 8.4 × 103 cfu·g-1 to 9.6 × 106 cfu·g-1 and 6.0 × 107 cfu·g-1 in the non-rhizosphere and rhizosphere soils respectively. Potassium and phosphorus nutritional conditions in the rhizosphere were markedly improved through inoculation of this bacterium. Available K and P respectively increased from 25. 86 and 3. 63mg · kg-1 in the non-rhizosphere soil to 91. 23 and 5. 74mg · kg-1 in the rhizosphere soil. Tomato biomass increased by 125%, K and P uptakes were more than 150%, greater than the non-inoculation. Thus, there is a potential in applying RGBcl3 for improving plant K and P nutrition.

硅酸盐细菌的筛选及其对番茄营养的影响

通过初筛、溶解硅酸盐矿物能力的分析和生物检验3个步骤,从蚯蚓肠道中分离得到1株不仅具有很强的溶解硅酸盐矿物的能力,而且对小麦幼苗生长有促进作用的细菌,经鉴定为胶质芽孢杆菌（实验室编号为RGBc13）。将此细菌接种到土壤并进行番茄盆栽试验,发现该菌株在根际和非根际土壤大量繁殖,根际区域有效磷钾含量大幅度提高,番茄生物量增加,磷钾吸收量也显著增加。