Microbiology of Soil

Smith, Nathan R.

doi:10.1146/annurev.mi.02.100148.002321

Cited by 12 publications

(1 citation statement)

References 63 publications

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“…In the middle of the 20th Century, it was considered that abiotic factors prevailed in shaping microbial selection in soils (Smith, ). However, since the 1990s increasing numbers of studies have reported on biotic factors driving microbial selection and functioning (Hobbie, ; Chapman et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Evidence for biological denitrification inhibition (BDI) by plant secondary metabolites

et al. 2014

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SummaryPrevious studies on the effect of secondary metabolites on the functioning of rhizosphere microbial communities have often focused on aspects of the nitrogen (N) cycle but have overlooked biological denitrification inhibition (BDI), which can affect plant N-nutrition. Here, we investigated the BDI by the compounds of Fallopia spp., an invasive weed shown to be associated with a low potential denitrification of the soil.Fallopia spp. extracts were characterized by chromatographic analysis and were used to test the BDI effects on the metabolic and respiratory activities of denitrifying bacteria, under aerobic and anaerobic (denitrification) conditions. The BDI of Fallopia spp. extracts was tested on a complex soil community by measuring denitrification enzyme activity (DEA), substrate induced respiration (SIR), as well as abundances of denitrifiers and total bacteria.In 15 strains of denitrifying bacteria, extracts led to a greater BDI (92%) than respiration inhibition (50%). Anaerobic metabolic activity reduction was correlated with catechin concentrations and the BDI was dose dependent. In soil, extracts reduced the DEA/SIR ratio without affecting the denitrifiers: total bacteria ratio.We show that secondary metabolite(s) from Fallopia spp. inhibit denitrification. This provides new insight into plant-soil interactions and improves our understanding of a plant's ability to shape microbial soil functioning.

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Section: Introductionmentioning

confidence: 99%