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. 2023 Mar 22;13:4682. doi: 10.1038/s41598-023-30899-z

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© The Author(s) 2023, corrected publication 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Zinc stable isotope difference (Δ⁶⁶Zn_{mob-total plant}) between mobilised Zn in cacao leaves (mob) and total plant Zn inventory versus mass fraction (f) of Zn present in cacao leaves for the 19 cacao genotypes treated with 20 µmol L⁻¹ CdCl₂. The solid line is a logarithmic best-fit Rayleigh fractionation trend for the sample data, which is forced through Δ⁶⁶Zn_{mob-total plant} at f = 1. This yields an isotope fractionation factor of ε⁶⁶Zn_seq-mob = + 0.54‰ between sequestered Zn and Zn mobilised to leaves.