Screening and Biological Characteristics of a Manganese Tolerant Microorganism

Abstract

Ecological adaptation of heavy metal polluted environments is significantly enhanced through plants inoculated with plant growth-promoting bacteria (PGPB), and the cost of phytostabilization in metal tailings can be reduced. On the basis of the systematic investigation of manganese tolerant plants which grew on Xiangtan manganese tailings, rhizosphere soils of the Chenopodium album Linn. were collected. One yellow manganese-resistant strain named XZL01 was isolated from the rhizosphere of fresh plants through concentration gradient screening technique, and the cellular form, physiological and biochemical tests were conducted, demonstrated as the growth curve and effects of temperature, pH, NaCl concentration on growth of the strain. All the results showed that 1) the strain reached logarithmic phase in 10-12h; 2) the optimal temperature range for growth of the strain was 25 ºC-30 ºC; 3) the optimal pH range for growth of the strain was 7.0-7.3; 4) the optimal NaCl concentration range for growth of the strain was 10g/L. In this study, the strain XZL01 was identified, and status of the strain in the taxonomy and phylogeny has been conformed according to 16S rDNA sequences, with the strain identificated as Microbacterium.sp XZL01.

Atmospheric Deposition-Carried Zn and Cd from a Zinc Smelter and Their Effects on Soil Microflora as Revealed by 16S rDNA

“…Eco-environmental pollution caused by smelting, mining and associated anthropogenic activity is a worldwide problem and scientists have focused more on particular environmental problems caused on the soil surface environment by the release of harmful substances, especially heavy metals (HM)12. In addition, HM deposition caused soil erosion and the destruction of vegetation on cultivated land by mining and smelting and as result HM accumulation in the food chain continues, which also poses a serious health hazard.…”

Effects of Bacillus amyloliquefaciens on volatile components and nutrient element contents of Mentha piperita L. grown under salt stress

“…The increase in Mn uptake with increasing salt levels in the current study is consistent with the literature (Maas et al 1972;Chavan and Karadge 1980;Martinez et al 1987;Alpaslan et al 1998). There are reports indicating that PGPB can promote Mn uptake (Xue et al 2011). In this study, it was observed that Ba had a salt stress-reducer effect only at 50 mM NaCl, but this level did not increase Mn uptake compared to the control or at other salt levels.…”

Temporal characterization of bacterial communities in a phytoremediation pilot plant aimed at decontaminating polluted sediments dredged from Leghorn harbor, Italy

“…Few authors have described the role of rhizosphere processes in the phytoremediation of inorganic pollutants [13], [14], [15]. Studies on bacteria responsible or involved in the phytoremediation process of polluted sediments are instead very specific, focusing on particular aspects of the process, such as heavy metal bacterial resistance [16], [17], associations of bacteria to plants that accumulate heavy metals [18], microorganism responses to high hydrocarbon concentrations [19] and to other organic compounds [20]. Few studies on phytoremediation applied to marine polluted dredged sediments are available; among these, the outcomes of the phytoremediation process are different, spacing from a reduction of contaminants that amounts around 90% [21], to a very low [22], [23], or even negative [24] remediation result.…”