Cr^(6+)胁迫培养对水生植物根际微生物的影响

Effects of Cr^(6+) Stress Culture on Rhizosphere Microorganism of Aquatic Plants

采用传统的微生物培养法,在实验室条件下,选择不同浓度的Cr6+对大薸(Pistiastratiote)、慈姑(Sagittaria sagittifolia L.)和穗状狐尾藻(Myriophyllum spicatum Linn.)进行胁迫培养,通过测定3种水生植物根际的微生物区系及与氮循环细菌的数量,研究3种水生植物根际微生物对重金属Cr6+的耐受性。结果表明,在Cr6+的胁迫下,3类微生物的敏感性可概括为放线菌>细菌>真菌,耐受性没有表现出明显的规律性;而对氨化细菌、硝化细菌、亚硝化细菌和反硝化细菌的影响表现出各自的特殊性。

Using traditional microbiological culture method,under laboratory conditions,different concentrations of Cr6＋ were selected for stress culture on Pistiastratiote,Sagittaria sagittifolia L. and Myriophyllum spicatum Linn. Through determination of the rhizosphere microorganism and the nitrogen cycle bacteria change of three kinds of aquatic plants,the tolerance of rhizosphere microorganism to Cr6＋ was studied. The results showed that the sensitivity of microorganisms could be summarized as：actinomycete bacteria fungi,it had no obvious regularity about tolerance of 3 microorganisms; while the effects demonstrated their specificity on ammonification bacteria,nitrifying bacteria,nitrosococcus bacteria and denitrifying bacteria.