Abstract
Aims
Zinc biofortification through agronomic and/or genetic approaches is one of the strategies to enrich food with this essential element to fulfil nutritional requirements in poor diets. This study aimed to unravel the physiological basis of differential tuber-Zn concentration between potato cultivars and to identify the major source(s) of Zn to the tubers.
Methods
Two potato cultivars, accumulating high (Lady Rosetta) and low (Cara) tuber-Zn, were evaluated and the patterns of biomass and Zn accumulation between organs assessed over the growth period. Furthermore, Zn partition in reciprocal grafted plants and in sixteen F1 genotypes following a cross between those cultivars was assessed at harvest.
Results
The cultivars differed in Zn-concentration, Zn-content and biomass partitioning between organs, although total plant-Zn content was comparable (4.7 and 5.1 mg Zn/plant for Cara and Lady Rosetta, respectively). At harvest the relative amount of Zn retained in roots, stems, leaves and tubers was 2 %,25 %,5 % and 68 % for Cara and 1 %,17 %,5 % and 77 % for Lady Rosetta. The differential tuber-Zn was associated with internal Zn distribution between shoots and tubers. Lady Rosetta translocated higher amounts of Zn to the tubers while Cara accumulated relatively more Zn in the stems associated with higher stem biomass. Remobilization of Zn from leaves and stems, and continuous root to xylem-phloem transfers during tuber bulking were the major sources of Zn supply to the tubers.
Conclusions
This study suggests that the potato stem plays an important role in regulating Zn distribution and also as a site for Zn deposition.
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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 the farm staff at Grange Animal & Grassland Research Centre in Dunsany, for assisting in soil collection. We gratefully acknowledge the State Laboratory for sharing their methodology for elemental determination in potato tubers by microwave digestion and ICP-MS and for the use of their ICP-MS instrument.
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Mengist, M.F., Milbourne, D., Griffin, D. et al. Zinc uptake and partitioning in two potato cultivars: implications for biofortification. Plant Soil 463, 601–613 (2021). https://doi.org/10.1007/s11104-021-04874-4
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DOI: https://doi.org/10.1007/s11104-021-04874-4