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Poor regulation of phosphorus uptake and rhizosphere carboxylates in three phosphorus-hyperaccumulating species of Ptilotus

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Abstract

Background and aims

Ptilotus polystachyus occurs in phosphorus (P) – poor soils, but can hyperaccumulate P without toxicity. We examined, in P-poor soils, P accumulation and rhizosphere carboxylates for three Ptilotus species, and carboxylate adsorption and associated P release.

Methods

Ptilotus spp. macrocephalus, nobilis and polystachyus were grown in two soils at 40, 100 and 400 mg P kg−1 soil as KH2PO4. After 6 weeks, dry weight (DW), tissue nutrients and rhizosphere carboxylates were determined. Citrate, malate and oxalate adsorption, and associated P release, was investigated in three soils.

Results

For all species, shoot DW and carboxylate amount were little affected by increasing P, while green leaves reached ~ 45–60 mg P g−1 DW: tissue P and carbon were negatively correlated. Oxalate was the dominant carboxylate and a large effect of soil type differed with unit (μmol g−1 root DW or rhizosphere soil DW, μmol plant−1). Adsorption was highest for oxalate, but differed with soil type; Freundlich and Langmuir functions generally fitted well. Citrate was the most effective for P release, followed by oxalate.

Conclusions

Inability to down-regulate P uptake and rhizosphere carboxylates with increasing P may be characteristic of Ptilotus. The role of these traits in adaptation to P-poor soils merits further investigation.

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Acknowledgments

L.D.B.S. appreciates the SIRF/UIS Scholarship awarded by The University of Western Australia and further scholarship support from the late Frank Ford.

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Authors and Affiliations

  1. Faculty of Agriculture, University of Peradeniya, Peradeniya, 20400, Sri Lanka

    L. B. D. Suriyagoda

  2. Centre for Agri-Environmental Research, School of Agriculture Policy and Development, University of Reading, Berkshire, RG6 6AR, UK

    M. Tibbett & T. Edmonds-Tibbett

  3. School of Plant Biology and Institute of Agriculture, The University of Western Australia, 35 Stirling Hwy, Crawley, Perth, WA, 6009, Australia

    L. B. D. Suriyagoda, G. R. Cawthray & M. H. Ryan

Authors
  1. L. B. D. Suriyagoda
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  2. M. Tibbett
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  3. T. Edmonds-Tibbett
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  4. G. R. Cawthray
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  5. M. H. Ryan
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Correspondence to M. H. Ryan.

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Responsible Editor: Philip John White.

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Suriyagoda, L.B.D., Tibbett, M., Edmonds-Tibbett, T. et al. Poor regulation of phosphorus uptake and rhizosphere carboxylates in three phosphorus-hyperaccumulating species of Ptilotus . Plant Soil 402, 145–158 (2016). https://doi.org/10.1007/s11104-015-2784-y

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