Biological nitrification inhibition in the rhizosphere: Determining interactions and impact on microbially mediated processes and potential applications

Pierfrancesco Nardi (Corresponding author), Hendrikus J. Laanbroek, Graeme W. Nicol, Giancarlo Renella, Massimiliano Cardinale, Giacomo Pietramellara, Wolfram Weckwerth, Alessandra Trinchera, Arindam Ghatak, Paolo Nannipieri

Research output: Contribution to journal/periodicalArticleScientificpeer-review

Abstract

Nitrification is the microbial conversion of reduced forms of nitrogen (N) to nitrate (NO3), and in fertilized soils it can lead to substantial N losses via NO3 leaching or nitrous oxide (N2O) production. To limit such problems, synthetic nitrification inhibitors have been applied but their performance differs between soils. In recent years, there has been an increasing interest in the occurrence of biological nitrification inhibition (BNI), a natural phenomenon according to which certain plants can inhibit nitrification through the release of active compounds in root exudates. Here, we synthesize the current state of research but also unravel knowledge gaps in the field. The nitrification process is discussed considering recent discoveries in genomics, biochemistry and ecology of nitrifiers. Secondly, we focus on the ‘where’ and ‘how’ of BNI. The N transformations and their interconnections as they occur in, and are affected by, the rhizosphere, are also discussed. The NH4+ and NO3 retention pathways alternative to BNI are reviewed as well. We also provide hypotheses on how plant compounds with putative BNI ability can reach their targets inside the cell and inhibit ammonia oxidation. Finally, we discuss a set of techniques that can be successfully applied to solve unresearched questions in BNI studies.

Original languageEnglish
Article numberfuaa037
Pages (from-to)874-908
Number of pages35
JournalFEMS Microbiology Reviews
Volume44
Issue number6
DOIs
Publication statusPublished - 01 Nov 2020

Keywords

  • Ammonia oxidizers
  • Biological nitrification inhibition
  • BNI compounds
  • Nitrification
  • Rhizosphere
  • Root exudates
  • internatioanl
  • Plan_S-Compliant_NO

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