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Elevated CO2 promotes the acquisition of phosphorus in crop species differing in physiological phosphorus-acquiring mechanisms

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Abstract

Background and aims

Crop species differ in phosphorus (P) acquisition in P-limiting environments. However, it is not fully understood how elevated atmospheric CO2 concentrations affects these P acquisition mechanisms and the plant's ability to acquire P from soil. This study aimed to investigate the effect of elevated CO2 on P acquisition in crop species with contrasting P acquisition mechanisms.

Methods

White lupin, faba bean, canola and near-isogenic wheat lines with and without citrate efflux were grown for 70 days in a P-deficient Chromosol soil under ambient (400 ppm) and elevated (800 ppm) CO2. Plant P uptake and P transformation in the rhizosphere were determined.

Results

Elevated CO2 promoted total P uptake in white lupin and canola by 84% and 48%, respectively, and decreased the P uptake in the non-citrate-exuding wheat (by 24%) but not the exuding wheat. In white lupin, elevated CO2 enhanced phosphatase activity and depletion of organic P in the rhizosphere. Elevated CO2 increased P uptake by increasing root length which allowed canola to exploit a greater volume of soil for P. In the rhizosphere of faba bean, NaOH-extractable inorganic P was greater under elevated CO2.

Conclusion

Crops which rely on organic acid exudation and phosphatases appear to be better adapted to acquiring P under elevated CO2.

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Acknowledgements

We would like to thank Mr. Mark Richards from New South Wales Department of Primary Industry for providing the white lupin and chickpea seeds and Professor Manny Delhaize from CSIRO for providing the wheat seeds. JBO was supported by an Australian Government Research Training Program Scholarship

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Correspondence to Caixian Tang.

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Responsible Editor: Honghua He.

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O’Sullivan, J.B., Jin, J. & Tang, C. Elevated CO2 promotes the acquisition of phosphorus in crop species differing in physiological phosphorus-acquiring mechanisms. Plant Soil 455, 397–408 (2020). https://doi.org/10.1007/s11104-020-04698-8

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  • DOI: https://doi.org/10.1007/s11104-020-04698-8

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