Appl Environ Microb 2001, 67:4742–4751.CrossRef 56. Soderberg KH, Olsson PA, Baath E: Structure and activity

CP673451 of the bacterial community in the rhizosphere of different plant species and the effect of arbuscular mycorrhizal colonization. FEMS Microbiol Ecol 2002, 40:223–231.PubMedCrossRef 57. Sessitch A, Gyamfi S, Tscherko D, Gerzabek M, Kandeler E: Activity of microorganisms in the rhizosphere of herbicide treated and untreated transgenic glufosinate-tolerant and wild type oilseed rape grown in containment. Plant Soil 2004, 266:105–116.CrossRef Competing interests The authors declare that they have no any conflict of interest. Authors’ contributions AKS was involved in all experimental work including manuscript writing. MS and SKD were designed the experiments and gave all inputs necessary for manuscript completion. All

authors read and approved the final manuscript.”
“Background The concentrations of atmospheric CO2 have been increasing for the last 150 years and are predicted to increase to 550 ppm by the middle of this century [1]. This ongoing increase in atmospheric CO2 is due to the extensive use of fossil fuels and changes in land use patterns [2]. The rapid PF-02341066 purchase increase of CO2 in the atmosphere over the last century has led to an increase of global ecosystem carbon storage [3]. Terrestrial ecosystems are intimately connected to atmospheric CO2 levels and soil is the major organic C pool in all terrestrial biomes [4]. Studies of ecosystem

MGCD0103 responses to elevated CO2 have shown that eCO2 can have major effects on terrestrial ecosystems by enhancing plant photosynthetic CO2 fixation and primary productivity, and altered plant and soil characteristics [5–9]. However, the disparity between modeling and empirical studies suggests as yet incomplete understanding of the combined impacts of this global change factor on ecosystem functioning. Since microorganisms mediate important biogeochemical Dimethyl sulfoxide processes such as soil C and N cycling, and are expected to influence future atmospheric CO2 concentrations, functional understanding of how eCO2 affects soil microbial community composition and structure will be necessary for robust prediction of atmospheric CO2 concentrations in the future. However, one of the major challenges for characterizing the functional diversity and their responses to the changes of atmospheric CO2 concentration is the extreme diversity and as-yet uncultivated status of many microorganisms. To date, most of the efforts to describe the effects of atmospheric CO2 concentration to soil microbial communities have been focused on phylogenetic composition [5, 10, 11]. Some studies [12, 13] tried to examine the responses of soil microbial community to the changes of CO2 concentration.