The diversity of bacterial nitrogenase genes (nifH) and their mRNA transcription in ectomycorrhizas of Corsican pine (Pinus nigra) were examined. DNA and RNA were extracted from surface-sterilized and non-sterilized Corsican pine roots colonized by the ectomycorrhizal (ECM) fungi, Suillus variegatus
Bacterial isolations were carried out on Pinus sylvestris--Suillus bovinus mycorrhizospheres obtained directly from boreal pine forest. When samples were taken during dry weather, the numbers of bacterial colony-forming units were significantly higher in uncolonized short roots and external mycelia
Bacterial communities associated with mycorrhizal roots are likely to respond to rising atmospheric CO(2) levels in terms of biomass, community composition and activity since they are supported by the carbon (C) flow outside the root tips, especially by exudation of low molecular weight organic
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