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Rhizosphere bacterial carbon turnover is higher in nucleic acids than membrane lipids: implications for understanding soil C

Using a pulse chase 13CO2 plant labeling experiment we compared the flow of plant carbon into macromolecular fractions of rhizosphere soil microorganisms. Time dependent 13C dilution patterns in microbial cellular fractions were used to calculate their turnover time. The turnover times of microbial biomolecules were found to vary: microbial RNA (19 h) and DNA (30 h) turned over fastest followed by chloroform fumigation extraction-derived soluble cell lysis products (14 days), while phospholipid fatty acids (PLFAs) had the slowest turnover (42 days).

Disentangling plant and soil microbial controls on carbon and nitrogen loss in grassland mesocosms

Summary

It is well known that plant–soil interactions play an important role in determining the impact of global change phenomena on biodiversity and ecosystem functioning. Little is known, however, about the individual and relative importance for carbon (C) and nitrogen (N) cycling of non-random changes in plant and soil communities that result from global change phenomena, such as fertilization and agricultural intensification.

Averill C. 2014. Divergence in plant and microbial allocation strategies explains continental patterns in microbial allocation a

Link: http://onlinelibrary.wiley.com.proxy.lib.iastate.edu/doi/10.1111/ele.123...

Divergence in plant and microbial allocation strategies explains continental patterns in microbial allocation and biogeochemical fluxes

Abstract:

Fellbaum et al. 2014 Fungal nutrient allocation is regulated by C source strength of host plant. New Phytologist

Fellbaum et al. 2014 Fungal nutrient allocation in common mycorrhizal networks is regulated by the carbon source strength of individual host plants. New Phytologist pre-print

http://onlinelibrary.wiley.com/doi/10.1111/nph.12827/abstract

Summary

Common mycorrhizal networks (CMNs) of arbuscular mycorrhizal (AM) fungi in the soil simultaneously provide multiple host plants with nutrients, but the mechanisms by which the nutrient transport to individual host plants within one CMN is controlled are unknown.

New Phytologist Virtual Issue: Scaling root processes

Some of the papers are already posted but the whole issue might be of interests to many of us.

http://issuu.com/wblifesci/docs/scaling_root_processes_vsi

Plant rhizosphere influence on microbial C metabolism: the role of elevated CO2, N availability and root stoichiometry

http://link.springer.com/article/10.1007%2Fs10533-014-9954-5

Yolima Carrillo • Feike A. Dijkstra •
Elise Pendall • Dan LeCain • Colin Tucker

Abstract Microbial decomposer C metabolism is
considered a factor controlling soil C stability, a key
regulator of global climate. The plant rhizosphere is
now recognized as a crucial driver of soil C dynamics
but specific mechanisms by which it can affect C
processing are unclear. Climate change could affect
microbial C metabolism via impacts on the plant
rhizosphere. Using continuous 13C labelling under

Xu et al. 2013. Global analysis of soil microbial biomass C, N, P

Xu et al. 2013. A global analysis of soil microbial biomass carbon, nitrogen and phosphorus in terrestrial ecosystems. Global Ecology and Biogeography 22:737-749.

Main conclusions

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