Shifting carbon flow from roots into associated microbial communities in response to elevated atmospheric CO 2

• DOI: 10.1073/pnas.0912421107
• Publication Date: 2010-06-02T00:51:16Z
• Authors: Barbara Drigo; Agata S. Pijl; Henk Duyts; Anna M. Kielak; Hannes A. Gamper; Marco J. Houtekamer; Henricus T. S. Bo...; Paul L. E. Bodelier; Andrew S. Whiteley; Johannes A. van Veen; George A. Kowalchuk
• Keywords: Terrestrial ecosystem; Soil carbon; Carbon fibers; Terrestrial plant

Rising atmospheric CO 2 levels are predicted to have major consequences on carbon cycling and the functioning of terrestrial ecosystems. Increased photosynthetic activity is expected, especially for C-3 plants, thereby influencing vegetation dynamics; however, little known about path fixed into soil-borne communities resulting feedbacks ecosystem function. Here, we examine how arbuscular mycorrhizal fungi (AMF) act as a conduit in transfer between plants soil elevated modulates belowground translocation pathway plant-fixed carbon. Shifts active AMF species under conditions coupled changes within rhizosphere bacterial fungal communities. Thus, opposed simply increasing microbes through enhanced rhizodeposition, clearly evokes emergence distinct opportunistic plant-associated microbial Analyses involving RNA-based stable isotope probing, neutral/phosphate lipid fatty acids community fingerprinting, real-time PCR allowed us trace affected microorganisms. Based our data, present conceptual model which plant-assimilated rapidly transferred AMF, followed by slower release from populations well-adapted prevailing (myco-)rhizosphere conditions. This provides general framework reappraising carbon-flow paths soils, facilitating predictions future interactions rising concentrations