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Quantitative assessment of the differential impacts of arbuscular and ectomycorrhiza on soil carbon cycling
A significant fraction of carbon stored in the Earth's soil moves through arbuscular mycorrhiza (AM) and ectomycorrhiza (EM). The impacts of AM and EM on the soil carbon budget are poorly understood.
Mau et al. 2015 ISME J. 9, 1477–1480.
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).
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
Divergence in plant and microbial allocation strategies explains continental patterns in microbial allocation and biogeochemical fluxes
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
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.
Some of the papers are already posted but the whole issue might be of interests to many of us.
Plant rhizosphere influence on microbial C metabolism: the role of elevated CO2, N availability and root stoichiometry
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
Microbial drivers of global change at the aggregate scale: linking genomic function to carbon metabolism and warming
Co-PI: Adina Howe, Folker Meyer, Galya Orr