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Ionomics analysis provides new insights into the co-enrichment of cadmium and zinc in wheat grains

文献类型： 外文期刊

作者： Qin, Xiaoming 1 ; Xia, Yitao 1 ; Hu, Chengxiao 1 ; Yu, Min 2 ; Shabala, Sergey 2 ; Wu, Songwei 1 ; Tan, Qiling 1 ; Xu, Sh 1 ;

作者机构： 1.Huazhong Agr Univ, Coll Resource & Environm, Microelements Res Ctr, Key Lab Arable Land Conservat Middle & Lower Reac, Wuhan 430070, Peoples R China

2.Foshan Univ, Int Res Ctr Environm Membrane Biol, Foshan 528000, Peoples R China

3.Univ Tasmania, Tasmanian Inst Agr, Hobart, Tas 7001, Australia

4.Guangdong Acad Agr Sciencs, Inst Qual Stander & Monitoring Technol Agroprod, Guangzhou 510640, Peoples R China

5.State Environm Protect Key Lab Soil Hlth & Green, Wuhan 430070, Peoples R China

关键词： Wheat; Cadmium; Zinc; Elemental toxicity; Long-distant transport

期刊名称：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY （ 影响因子：6.291； 五年影响因子：6.393 ）

ISSN： 0147-6513

年卷期： 2021 年 223 卷

页码：

收录情况： SCI

摘要： Cadmium (Cd) is present in many soils and, when enter a food chain, represents a major health threat to humans. The existent large variation in grain Cd content amongst wheat genotypes opens prospects for genetic improvement for reduced Cd uptake in this species. However, selecting low-Cd-accumulating varieties comes with a possible caveat of affecting uptake other essential nutrients. In this work, we screened 134 wheat varieties in 3 various field studies and selected 15 high- and 15 low-Cd accumulating varieties in grains for ionomics analysis. Our results showed that high-Cd accumulating varieties also possessed an ability to accumulate mineral elements of calcium, magnesium, manganese, iron and zinc, while varieties with low Cd content were deficient in many essential nutrients and, especially, zinc (Zn). The above data was confirmed in an independent trail involving another 97 wheat varieties. Thus, selecting plants for high Zn accumulation (as a part of biofortification programs) resulted in an inadvertent increase in accumulation of the toxic Cd in wheat. Vice versa, selecting low Cd-accumulating varieties comes with a danger of reducing their Zn content, with major consequences to food quality and human health. We suggest that the above conundrum can be resolved by understanding the structure-function relations of various transporters isoforms involved in Zn and Cd transport and issue-specific mode of their operation, via cell-based phenotyping followed by molecular breeding.

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