Selenium volatilization by soil bacteria isolated from rhizosphere of rabbitfoot grass (Polypogon monspeliensis)
Rabbitfoot grass (Polypogon monspeliensis) was previously identified as one of the most effective plant species for selenium (Se) volatilization in treatment wetlands under field conditions. Both plants and soil microbes are capable of methylating inorganic Se into volatile selenide compounds, which varies significantly among the species. Therefore, it is important to identify the soil mi-crobes that have the greatest ability of volatilizing Se in the soil- rabbitfoot grass system. In this laboratory study, a total 18 soil bacterial strains were isolated from top and rhizosphere soils of rabbitfoot grass that were previously treated with 20 mg(Se)· kg<1>, as well as from those of the control (background Se level <1 mg(Sc)·kg <1>). The rate of Se volatilization was deter-mined in 200 ml pure bacterial culture solutions containing 6mg(Se)· L<1>. Results show that Cellulornonas cellasea isolated from the Se-treated soil rabbitfoot grass system produced the highest rate of Sc volatilization (638μg Se per flask per day), followed by Listeria grayi, 112μg Se per flask per day.
Selenium volatilization rhizosphere bacteria Cellulomonas cellasea rabbitfoot grass
P. Upadhyaya R. P. Dixon D. Duvernell K. A. Johnson Z. Q. Lin
Environmental Sciences Program Department of Chemistry Department of Biological Sciences, Southern Illinois University Edwardsville, Edwardsvilte, IL 62026 Environmental Sciences Program Department of Chemistry Environmental Sciences Program Department of Biological Sciences, Southern Illinois University Edwar
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
562-563
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）