Authors |
Neugebauer, K, Broadley, M.R., El-Serehy, H.A., George, T.S., Graham, N.S., Thompson, J.A., Wright, G. and White, P.J.
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Publication details |
Annals of Botany 129(1), 65-78. Oxford University Press, Oxford, UK.
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Publisher details |
Oxford University Press, Oxford, UK
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Keywords |
Angiosperm, Caryophyllales, evolution, ionome, matK phylogeny, mineral composition, shoot and root partitioning, sodium (Na) hyperaccumulation
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Abstract |
Background and Aims
Some Caryophyllales species accumulate abnormally large shoot sodium (Na) concentrations in non-saline environments. It is not known whether this is a consequence of altered Na partitioning between roots and shoots. This paper tests the hypotheses (1) that Na concentrations in shoots ([Na]shoot) and in roots ([Na]root) are positively correlated among Caryophyllales, and (2) that shoot Na hyperaccumulation is correlated with [Na]shoot/[Na]root quotients.
Methods
Fifty two genotypes, representing 45 Caryophyllales species and 4 species from other angiosperm orders, were grown hydroponically in a non-saline, complete nutrient solution. Concentrations of Na in shoots and in roots were determined using inductively coupled plasma mass spectrometry (ICP-MS).
Key Results
Sodium concentrations in shoots and roots were not correlated among Caryophyllales species with normal [Na]shoot, but were positively correlated among Caryophyllales species with abnormally large [Na]shoot. In addition, Caryophyllales species with abnormally large [Na]shoot had greater [Na]shoot/[Na]root than Caryophyllales species with normal [Na]shoot.
Conclusions
Sodium hyperaccumulators in the Caryophyllales are characterized by abnormally large [Na]shoot, a positive correlation between [Na]shoot and [Na]root, and [Na]shoot/[Na]root quotients greater than unity. |
Last updated |
2022-02-17 |
Files |
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Neugebauer_2022_accepted.pdf
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Links |
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Journal link
https://academic.oup.com/aob/article/129/1/65/6381089?login=true#326252454
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DOI
https://doi.org/10.1093/aob/mcab126
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