Sodium hyperaccumulators in the Caryophyllales are characterized by both abnormally large shoot sodium concentrations and [Na]shoot/[Na]root quotients greater than unity

Neugebauer, Konrad; Broadley, Martin R; El-Serehy, Hamed A.; George, Timothy S.; Graham, Neil S; Thompson, Jacqueline A.; Wright, Gladys; White, Philip J.

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.

Citation

Neugebauer, K., Broadley, M. R., El-Serehy, H. A., George, T. S., Graham, N. S., Thompson, J. A., Wright, G., & White, P. J. (2022). Sodium hyperaccumulators in the Caryophyllales are characterized by both abnormally large shoot sodium concentrations and [Na]shoot/[Na]root quotients greater than unity. Annals of Botany, 129(1), 65-78. https://doi.org/10.1093/aob/mcab126

• Journal Article Type: Article
• Acceptance Date: Oct 4, 2021
• Online Publication Date: Oct 4, 2021
• Publication Date: Jan 1, 2022
• Deposit Date: Feb 11, 2022
• Publicly Available Date: Oct 5, 2022
• Journal: Annals of Botany
• Print ISSN: 0305-7364
• Electronic ISSN: 1095-8290
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 129
• Issue: 1
• Pages: 65-78
• DOI: https://doi.org/10.1093/aob/mcab126
• Keywords: Plant Science
• Public URL: https://nottingham-repository.worktribe.com/output/7378235
• Publisher URL: https://academic.oup.com/aob/article-abstract/129/1/65/6381089
• Additional Information: This is a pre-copyedited, author-produced version of an article accepted for publication in Annals of Botany following peer review. The version of record Konrad Neugebauer, Martin R Broadley, Hamed A El-Serehy, Timothy S George, Neil S Graham, Jacqueline A Thompson, Gladys Wright, Philip J White, Sodium hyperaccumulators in the Caryophyllales are characterized by both abnormally large shoot sodium concentrations and [Na]shoot/[Na]root quotients greater than unity, Annals of Botany, Volume 129, Issue 1, 1 January 2022, Pages 65–78 is available online at: https://doi.org/10.1093/aob/mcab126.