Abstract
Background
The vast majority of terrestrial plants, including most crops, associate with fungi of the phylum Glomeromycota to form symbiotic associations, known as arbuscular mycorrhizas. Arbuscular mycorrhizas play a pivotal role in the terrestrial cycling of nitrogen (N). Recent advances in mycorrhizal research show that arbuscular mycorrhizal fungi (AMF) can reduce denitrification rates and nitrous oxide (N2O) emissions from soils. The rapid increase in the literature, over the last five years, opens up the opportunity to address mechanisms through which AMF might control denitrification.
Scope
In this review, we classify likely mechanisms through which AMF modify through their hyphae denitrification and N2O emissions into two categories: proximal mechanisms, manifested through direct changes to denitrifiers and distal mechanisms which induce indirect changes to denitrifiers. We distinguish between two types of influences, (i) alterations in the size and activity of denitrifiers and (ii) alterations in the relative availability of two key groups of genes, nitrite reductases (nirK & nirS) and nitrous oxide reductases (nosZ).
Conclusion
Proximal mechanisms could reduce N2O emissions through depleting available soil N and C, metal ions, modifying soil moisture, immobilizing C and N or through altering the denitrifying community, and the relative abundance of genes involved in denitrification. Distal mechanisms could impact denitrification through changing soil pH, organic matter decomposition, improvement in soil aggregation, as well as promoting plant diversity and productivity. There are apparently many likely mechanisms, proximal and distal, through which AMF could alter N2O production, even though their ecological importance for N cycling remains open to question.
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Okiobe, S.T., Pirhofer-Walzl, K., Leifheit, E.F. et al. Proximal and distal mechanisms through which arbuscular mycorrhizal associations alter terrestrial denitrification. Plant Soil 476, 315–336 (2022). https://doi.org/10.1007/s11104-022-05534-x
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DOI: https://doi.org/10.1007/s11104-022-05534-x