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Nitrogen-modulated effects of the diazotrophic bacterium Cupriavidus taiwanensis on the non-nodulating plant Arabidopsis thaliana

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Abstract

Background and Aims

Nitrogen (N) is essential for plant growth, yet the role of diazotrophic bacteria in non-nodulating plants, particularly from the β-class Pseudomonadota, remains unclear. We explored the mechanisms underlying the interaction of Cupriavidus taiwanensis LMG19424, belonging to this group and known for nodulation induction in Mimosa sp., with the non-nodulating plant Arabidopsis thaliana.

Methods

In vitro experiments with LMG19424 and Arabidopsis, varying N levels (KNO3), and utilizing plant and bacterial mutant lines were conducted. Then, we analyzed the physiological, nutritional, and molecular effects in the inoculated plants. We also evaluated the rhizospheric and endophytic colonization of the strain in this plant species.

Results

Inoculation with LMG19424 consistently increased rosette and root growth across a KNO3 gradient, except in roots in specific plant mutant lines (auxin and ethylene pathways). A nifH-deletion mutant of LMG19424 induced root development but lost the ability to stimulate rosette growth. C. taiwanensis colonized plants endophytically, increasing N and P content while decreasing Fe in plant tissues under varying KNO3 conditions. Furthermore, strain LMG19424 influenced plant gene expression in hormonal pathways and N transport/metabolism, with N conditions strongly affecting this regulation.

Conclusions

In Arabidopsis, LMG19424 acts as a Plant Growth Promoting Bacterium, with N availability critically influencing its effect on plant physiology and gene regulation. Microbial-N fixation modulates host plant growth, with contrasting shoot and root responses. This emphasizes the pivotal role of the abiotic environment, particularly N availability, in shaping microbial-plant interactions and offers insights into interactions among diazotrophic β-class Pseudomonadota and non-nodulating plants.

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Data Availability

The data that support the findings of this study are available on request from the corresponding author (MJP).

References

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Acknowledgements

We especially thank A & L Canada Laboratories Inc. and Dr. Soledad Saldías for completing the nutritional analysis of the samples. We also thank Dr. Delphine Capela for kindly providing us with the nifH mutant strain (CBM2568).

Funding

ANID PIA/BASAL FB0002 supported this work as, as did the ANID-Millennium Science Initiative Program— NCN2021_010, ANID PIA/ANILLOS ACT210052, ANID-FONDECYT 1211894, and ANID-FONDECYT 1230472. In addition, DR was supported by the ANID scholarship 2117145.

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Authors

Contributions

DR and MJP conceived the experimental strategies. DR and NC performed the experiments throughout the manuscript and collected the data. DR, TL, AV, and MJP generally interpreted the results, analyzed the data, and generated the graphics. All authors contributed to data interpretation and discussion and edited the manuscript.

Corresponding author

Correspondence to María Josefina Poupin.

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The authors declare that the research was conducted without any commercial or financial relationships that could potentially create a conflict of interest.

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Ruiz, D., Céspedes-Bernal, N., Vega, A. et al. Nitrogen-modulated effects of the diazotrophic bacterium Cupriavidus taiwanensis on the non-nodulating plant Arabidopsis thaliana. Plant Soil (2024). https://doi.org/10.1007/s11104-024-06736-1

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  • DOI: https://doi.org/10.1007/s11104-024-06736-1

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