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Article Dans Une Revue Applied Microbiology and Biotechnology Année : 2021

Contribution of pathogenic fungi to N2O emissions increases temporally in intensively managed strawberry cropping soil

Ying Huang
  • Fonction : Auteur
Jinquan Jing
  • Fonction : Auteur
Meiling Yan
  • Fonction : Auteur
Christina Hazard
Yuehong Chen
  • Fonction : Auteur
Chengbao Guo
  • Fonction : Auteur
Xu Xiao
  • Fonction : Auteur
Jiujun Lin
  • Fonction : Auteur

Résumé

Intensively managed agriculture land is a significant contributor to nitrous oxide (N2O) emissions, which adds to global warming and the depletion of the ozone layer. Recent studies have suggested that fungal dominant N2O production may be promoted by pathogenic fungi under high nitrogen fertilization and continuous cropping. Here, we measured the contribution of fungal communities to N2O production under intensively managed strawberry fields of three continuous cropping years (1, 5, and 10 years) and compared this adjacent bare soil. Higher N2O emission was observed from the 10-year field, of which fungi and prokaryotes accounted for 79.7% and 21.3%, respectively. Fungal population density in the 10-year field soil (4.25 × 105 colony forming units per g (CFU/g) of air-dried soil) was greater than the other cropping years. Illumina MiSeq sequencing of the nirK gene showed that long-term continuous cropping decreased the diversity of the fungal denitrifier community, but increased the abundance of Fusarium oxysporum. Additionally, F. oxysporum produced large amounts of N2O in culture and in sterile 10-year field soil. A systemic infection displayed by bioassay strawberry plants after inoculation demonstrated that F. oxysporum was a pathogenic fungus. Together, results suggest that long-term intensively managed monocropping significantly influenced the denitrifying fungal community and increased their biomass, which increased fungal contribution to N2O emissions and specifically by pathogenic fungi.
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hal-03776209 , version 1 (13-09-2022)

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Ying Huang, Jinquan Jing, Meiling Yan, Christina Hazard, Yuehong Chen, et al.. Contribution of pathogenic fungi to N2O emissions increases temporally in intensively managed strawberry cropping soil. Applied Microbiology and Biotechnology, 2021, 105 (5), pp.2043-2056. ⟨10.1007/s00253-021-11163-8⟩. ⟨hal-03776209⟩
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