Lu Min, Cao Xuerui, Lin Qiang, Hussain Bilal, Feng Ying, He Zhenli, Kang Kyong Ju, Yang Xiaoe
Key Laboratory of Environmental Remediation and Ecosystem Health, Ministry of Education (MOE), College of Environmental and Resources Sciences, Zhejiang University, Hangzhou, 310058, People's Republic of China.
University of Florida, Institute of Food and Agricultural Sciences, Department of Soil and Water Sciences, Indian River Research and Education Center, Fort Pierce, FL, 34945, USA.
Environ Sci Pollut Res Int. 2021 Jul;28(28):37716-37726. doi: 10.1007/s11356-021-13385-9. Epub 2021 Mar 15.
Cadmium (Cd) pollution in cultivated soils has posed a great risk to human health through the soil-plant-human pathway. Therefore, it is important to derive soil thresholds for the low-Cd accumulating genotype of wheat (Triticum aestivum L.) to promote its application in agricultural production on Cd-contaminated sites. Here, a pot experiment was performed to explore the transfer characteristics of Cd in two contrasting wheat genotypes at three different soils and the effect of soil parameters together with soil safety Cd thresholds derivation. Generally, grain Cd highly accumulating wheat genotype (Zhenmai10, HT) showed higher Cd accumulation in grains than grain Cd weakly accumulating wheat genotype (Aikang58, LT). Stepwise multiple linear regression (SMLR) analysis (log-transformed Freundlich-type) indicated that Cd accumulation in wheat grains was strongly related to soil total Cd concentration and pH for both genotypes (R = 0.907*** for HT; R = 0.910*** for LT). Combining the simple regression model of soil-plant transfer system with the risk assessment method based on human health, soil total Cd thresholds for three soils were calculated with the values of 0.62, 0.82, and 0.62 mg kg in LT genotype and 0.31, 0.77, and 0.49 mg kg in HT genotype. Therefore, we suggested that when deducing soil thresholds, the ability of wheat genotypes to accumulate Cd and soil properties should be considered because of the large differences in soil thresholds between different genotypes and types of soils. We believe our results will promote the application of low-Cd wheat genotypes to agricultural production, thereby ensuring the safety of their products.
耕地土壤中的镉（Cd）污染通过土壤-植物-人类途径对人类健康构成了巨大风险。因此，推导小麦（Triticum aestivum L.）低镉积累基因型的土壤阈值，以促进其在镉污染场地农业生产中的应用具有重要意义。在此，进行了一项盆栽试验，以探究两种对比鲜明的小麦基因型在三种不同土壤中镉的转移特性，以及土壤参数的影响和土壤安全镉阈值的推导。总体而言，籽粒镉高积累小麦基因型（镇麦10，HT）籽粒中的镉积累量高于籽粒镉弱积累小麦基因型（矮抗58，LT）。逐步多元线性回归（SMLR）分析（对数转换的弗伦德利希型）表明，两种基因型小麦籽粒中的镉积累均与土壤总镉浓度和pH密切相关（HT基因型R = 0.907***；LT基因型R = 0.910***）。将土壤-植物转移系统的简单回归模型与基于人类健康的风险评估方法相结合，计算出三种土壤的土壤总镉阈值，LT基因型分别为0.62、0.82和0.62 mg/kg，HT基因型分别为0.31、0.77和0.49 mg/kg。因此，我们建议在推导土壤阈值时，应考虑小麦基因型的镉积累能力和土壤性质，因为不同基因型和土壤类型之间的土壤阈值差异很大。我们相信我们的结果将促进低镉小麦基因型在农业生产中的应用，从而确保其产品的安全性。
