Understanding Cadmium Uptake by Cocoa Plants via Cd Isotope Analyses

通过镉同位素分析了解可可植物对镉的吸收

• 批准号: ST/P003257/1
• 负责人: Mark Rehkamper
• 金额: $ 6.14万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2017
• 资助国家: 英国
• 起止时间: 2017 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FP003257%2F1
• 关键词: Understanding; Cadmium; Uptake; Cocoa; Plants

Cadmium (Cd) is a trace metal that is highly toxic even at low concentrations. The relatively high Cd abundances often found in cocoa are a serious problem for the cocoa producers of developing nations, as the European Union plans to implement strict new upper limits for Cd in cocoa products in 2019. This development has recently spurred research into the causes of Cd enrichment in cocoa. Such work has mainly focused on the impact of external factors, such as soil type, pH and cultivation practices, on the Cd content of cocoa but until now, these investigations have failed to provide conclusive results. Hence, it has been suggested that Cd accumulation may vary across different cocoa varieties but this possible link has yet to be investigated. The current project constitutes collaborative research by Prof M Rehkamper, an isotope geochemist at Imperial College London, and Prof J Dunwell, a plant physiologist at the University of Reading. Previous work of Rehkamper has shown that coupled Cd concentration and stable isotope analyses, initially developed for planetary science research, can provide unique insights into Cd uptake and translocation by plants. Furthermore, a 2015 pilot study of Rehkamper and Dunwell revealed that such analyses are also promising for cocoa. In the current 6-month project, the results of the 2015 pilot experiment will be verified, to ensure that coupled Cd concentration and isotope data indeed provide a reliable measure for Cd uptake by and translocation within plants. Furthermore, a suite of different cocoa varieties will be analysed to characterise the overall variability of Cd uptake and accumulation amongst different types of this plant. Together, the results will enable an initial identification of cocoa varieties that are particularly suitable for cultivation because they feature minimal Cd accumulation in beans, due to low uptake of Cd by the plant and reduced transport from the roots to the fruit.As such, the results of this study can make an important contribution to the development of sustainable methods for the production of cocoa beans with safe levels of Cd, thereby ensuring a reliable source of income for cocoa producers in developing nations and boosting the economies of rural communities.

镉（Cd）是一种微量金属，即使在低浓度下也具有高度毒性。可可中相对较高的镉含量对发展中国家的可可生产商来说是一个严重的问题，因为欧盟计划在2019年对可可产品中的镉含量实施严格的新上限。这一发展最近刺激了对可可中镉富集原因的研究。这些工作主要集中在外部因素的影响，如土壤类型，pH值和种植方法，对可可的镉含量，但到目前为止，这些调查未能提供结论性的结果。因此，有人建议，镉的积累可能会因不同的可可品种而异，但这种可能的联系还有待调查。目前的项目是由伦敦帝国理工学院的同位素地球化学家M·坎佩尔教授和阅读大学的植物生理学家J·邓维尔教授合作研究的。Eschkamper先前的工作表明，耦合镉浓度和稳定同位素分析，最初开发的行星科学研究，可以提供独特的见解镉吸收和转运的植物。此外，2015年，Escherkamper和Dunwell的一项试点研究表明，这种分析对可可也有希望。在目前为期6个月的项目中，将对2015年试点实验的结果进行验证，以确保耦合的Cd浓度和同位素数据确实为植物吸收和转运Cd提供了可靠的措施。此外，还将分析一系列不同的可可品种，以表征该植物不同类型之间镉吸收和积累的总体变异性。总之，这些结果将使初步鉴定可可品种，特别是适合种植，因为他们的特点是最小的镉积累在豆类，由于低吸收的镉的植物和减少运输从根到水果。因此，这项研究的结果可以作出重要贡献的可持续发展的方法，生产可可豆与安全水平的镉，从而确保发展中国家可可生产者的可靠收入来源，并促进农村社区的经济。

项目成果

Cadmium and zinc isotope compositions indicate metal sources and retention mechanisms in different soil particle size fractions.

• DOI: 10.1016/j.jhazmat.2023.132560
• 发表时间: 2023-09
• 期刊: Journal of hazardous materials
• 影响因子: 13.6
• 作者: Jiawen Zhou;Rebekah E. T. Moore;M. Rehkämper;K. Kreissig;Barry Coles;Longhua Wu;Yongming Luo;Peter Christie

Cadmium isotope fractionation in the soil - cacao systems of Ecuador: a pilot field study.

• DOI: 10.1039/c9ra05516a
• 发表时间: 2019-10-18
• 期刊: RSC ADVANCES
• 影响因子: 3.9
• 作者: Barraza, Fiorella;Moore, Rebekah E. T.;Rehkamper, Mark;Schreck, Eva;Lefeuvre, Gregoire;Kreissig, Katharina;Coles, Barry J.;Maurice, Laurence
• 通讯作者: Maurice, Laurence

An investigation of zinc isotope fractionation in cacao (Theobroma cacao L.) and comparison of zinc and cadmium isotope compositions in hydroponic plant systems under high cadmium stress.

• DOI: 10.1038/s41598-023-30899-z
• 发表时间: 2023-03-22
• 期刊: SCIENTIFIC REPORTS
• 影响因子: 4.6
• 作者: Barati, Elnaz;Moore, Rebekah E. T.;Ullah, Ihsan;Kreissig, Katharina;Coles, Barry J.;Dunwell, Jim M.;Rehkaemper, Mark
• 通讯作者: Rehkaemper, Mark

Using isotopes to trace freshly applied cadmium through mineral phosphorus fertilization in soil-fertilizer-plant systems.

• DOI: 10.1016/j.scitotenv.2018.08.127
• 发表时间: 2019-01
• 期刊: The Science of the total environment
• 作者: M. Wiggenhauser;M. Bigalke;M. Imseng;A. Keller;M. Rehkämper;W. Wilcke;E. Frossard