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. 2019 Jul 29;20:615. doi: 10.1186/s12864-019-5939-z

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — a Grain Cd concentration among three major wheat groups. The Chuanyu group included 52 wheat cultivars, the CIMMYT group included 56 wheat cultivars, and the CMC group included 73 wheat cultivars. b Percentage of low Cd concentration (≤ 0.0579 mg/kg), moderate Cd concentrations (< 0.1 mg/kg) and exceeding Cd concentration standard (≥ 0.1 mg/kg) wheat in each of the three groups