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Roles of shoots and roots in cadmium uptake and distribution in tubers of potato (Solanum tuberosum L)

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Abstract

Aim

Potato cultivars vary in biomass production and Cd concentration. Differences in growth can lead to differences in tuber cadmium (Cd) concentration through growth dilution and/or limited uptake of Cd from the soil. The aims of this study were to investigate the relative importance of shoot (above ground plant parts) and root in dry weight (DW) accumulation, total Cd uptake and Cd distribution between organs and how this affects tuber Cd concentration.

Materials and methods

Three experiments were carried out, two with reciprocal grafting between high and low tuber Cd accumulating cultivars under two soil Cd conditions, and the other was involving the evaluation of F1 genotypes, from a cross between these high and low tuber Cd accumulating cultivars. These experiments were carried out under controlled greenhouse conditions.

Results

The results showed that the root system is important for total Cd uptake but less important for growth and Cd distribution between organs. On the other hand, the shoot system is important for regulating growth of shoot and roots, and for determining Cd distribution between organs.

Conclusion

The data suggest that tuber Cd concentration was mainly regulated by shoot source and to a lesser extent by total uptake of Cd.

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Acknowledgements

This study is part of the RED-Cd-IRL project, funded under the Research Stimulus Fund (RSF, Ref 11 SF 308) by the Irish Department of Agriculture, Food and the Marine (DAFM). Molla F. Mengist acknowledges the post-graduate scholarship under the same project. We appreciate the assistance of the potato breeding team at Oak Park Crop Research Centre in Carlow, for the support in the set up and maintenance of the experimental trials, and Francis Collier and the farm staff at Grange Animal & Grassland Research Centre in Dunsany, for assisting in soil collection.

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Authors and Affiliations

  1. Teagasc, Crops Research Centre, Oak Park, Co. Carlow, R93 XE12, Ireland

    Molla F. Mengist, Dan Milbourne, Sheila Alves & Denis Griffin

  2. School of Biological, Earth and Environmental Sciences, University College Cork, Western Road, Cork, Ireland

    Molla F. Mengist & Peter W. Jones

  3. Soil Science Group, School of Agriculture, Food and Wine, University of Adelaide, PMB 1 Waite Campus, Glen Osmond, SA, 5064, Australia

    Mike J. McLaughlin

Authors
  1. Molla F. Mengist
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  2. Dan Milbourne
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  3. Sheila Alves
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  4. Mike J. McLaughlin
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  5. Peter W. Jones
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  6. Denis Griffin
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Contributions

MFM, DG and DM conceived the study; MFM performed the experiment, data analysis and drafted the manuscript; SA, PWJ and MJM gave scientific input and contributed to the interpretation of results. All authors read and edited the manuscript.

Corresponding author

Correspondence to Denis Griffin.

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Responsible Editor: Juan Barcelo

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Mengist, M.F., Milbourne, D., Alves, S. et al. Roles of shoots and roots in cadmium uptake and distribution in tubers of potato (Solanum tuberosum L). Plant Soil 430, 139–149 (2018). https://doi.org/10.1007/s11104-018-3717-3

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  • DOI: https://doi.org/10.1007/s11104-018-3717-3

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