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Biological nitrogen fixation maintains carbon/nitrogen balance and photosynthesis at elevated CO2

Brooks, Matthew D. ; Szeto, Ronnia C.

Plant, cell and environment, 2024-06, Vol.47 (6), p.2178-2191 [Periódico revisado por pares]

Oxford: Wiley Subscription Services, Inc

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  • Título:
    Biological nitrogen fixation maintains carbon/nitrogen balance and photosynthesis at elevated CO2
  • Autor: Brooks, Matthew D. ; Szeto, Ronnia C.
  • Assuntos: Alfalfa ; Biological effects ; Carbon ; Carbon dioxide ; climate change ; Gene expression ; gene regulatory networks ; Genomes ; Legumes ; Medicago sativa (alfalfa) ; Metabolism ; Nitrogen ; Nitrogen balance ; Nitrogen fixation ; Nitrogen metabolism ; Nitrogenation ; Photosynthesis ; photosynthetic acclimation ; Physiological effects ; Transcription ; Transcription factors
  • É parte de: Plant, cell and environment, 2024-06, Vol.47 (6), p.2178-2191
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: Understanding crop responses to elevated CO2 is necessary to meet increasing agricultural demands. Crops may not achieve maximum potential yields at high CO2 due to photosynthetic downregulation, often associated with nitrogen limitation. Legumes have been proposed to have an advantage at elevated CO2 due to their ability to exchange carbon for nitrogen. Here, the effects of biological nitrogen fixation (BNF) on the physiological and gene expression responses to elevated CO2 were examined at multiple nitrogen levels by comparing alfalfa mutants incapable of nitrogen fixation to wild‐type. Elemental analysis revealed a role for BNF in maintaining shoot carbon/nitrogen (C/N) balance under all nitrogen treatments at elevated CO2, whereas the effect of BNF on biomass was only observed at elevated CO2 and the lowest nitrogen dose. Lower photosynthetic rates at were associated with the imbalance in shoot C/N. Genome‐wide transcriptional responses were used to identify carbon and nitrogen metabolism genes underlying the traits. Transcription factors important to C/N signalling were identified from inferred regulatory networks. This work supports the hypothesis that maintenance of C/N homoeostasis at elevated CO2 can be achieved in plants capable of BNF and revealed important regulators in the underlying networks including an alfalfa (Golden2‐like) GLK ortholog. Summary statement Biological nitrogen fixation maintains carbon‐nitrogen ratio and prevents downregulation of photosynthesis at elevated CO2, a phenomenon known as photosynthetic acclimation. Metabolic genes and transcriptional regulators associated with carbon/nitrogen are identified as potential targets for optimizing responses to rising CO2 levels.
  • Editor: Oxford: Wiley Subscription Services, Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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