ABSTRACT
Selenium (Se) is an essential micronutrient for humans and its function includes preventing diseases, improving health, and delaying aging. However, the Se-rich soils in Guangxi are mostly acidic, and the Se in the soils is mostly insoluble complex iron selenite, leading to the low availability of Se and directly affecting its utilization. The bioavailability of Se in soil is significantly affected by environmental microorganisms which can change the form and valence of Se through their activity. Soil samples were collected from several Se-rich areas in Guangxi, and 10 g of soil samples were added to 90 mL of sterile phosphate buffered saline with 10 glass beads. The concentration of Se in the solution was obtained from the standard curve. The genomic DNA of Se-enriched bacterial was extracted and used as template. Selenium-tolerant bacteria existed in red and lateritic red soils of sandy shale parent material in different Se-rich areas of Guangxi.
