To Fix or Not To Fix: Controls on Free-Living Nitrogen Fixation in the Rhizosphere.
diazotrophs
environmental controls
free-living nitrogen fixation
rhizosphere
rhizosphere-inhabiting microbes
Journal
Applied and environmental microbiology
ISSN: 1098-5336
Titre abrégé: Appl Environ Microbiol
Pays: United States
ID NLM: 7605801
Informations de publication
Date de publication:
15 03 2019
15 03 2019
Historique:
pubmed:
20
1
2019
medline:
28
2
2020
entrez:
20
1
2019
Statut:
epublish
Résumé
Free-living nitrogen fixation (FLNF) in the rhizosphere, or N fixation by heterotrophic bacteria living on/near root surfaces, is ubiquitous and a significant source of N in some terrestrial systems. FLNF is also of interest in crop production as an alternative to chemical fertilizer, potentially reducing production costs and ameliorating negative environmental impacts of fertilizer N additions. Despite this interest, a mechanistic understanding of controls (e.g., carbon, oxygen, nitrogen, and nutrient availability) on FLNF in the rhizosphere is lacking but necessary. FLNF is distinct from and occurs under more diverse and dynamic conditions than symbiotic N fixation; therefore, predicting FLNF rates and understanding controls on FLNF has proven difficult. This has led to large gaps in our understanding of FLNF, and studies aimed at identifying controls on FLNF are needed. Here, we provide a mechanistic overview of FLNF, including how various controls may influence FLNF in the rhizosphere in comparison with symbiotic N fixation occurring in plant nodules where environmental conditions are moderated by the plant. We apply this knowledge to a real-world example, the bioenergy crop switchgrass (
Identifiants
pubmed: 30658971
pii: AEM.02546-18
doi: 10.1128/AEM.02546-18
pmc: PMC6414387
pii:
doi:
Types de publication
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Review
Langues
eng
Sous-ensembles de citation
IM
Commentaires et corrections
Type : ErratumIn
Informations de copyright
Copyright © 2019 American Society for Microbiology.
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