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Effects of foliar zinc application on the bioaccessibilities and chemical forms of cadmium and zinc in Brassica chinensis L.
Received:September 27, 2021  
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KeyWord:Brassica chinensis L.;foliar zinc application;cadmium;bioaccessibility;chemical form
Author NameAffiliationE-mail
TAO Xueying Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China 
 
XU Yingming Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China 
 
WANG Lin Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China 
wanglin2017@caas.cn 
LIU Chang Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China 
 
SUN Yuebing Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China 
 
LIANG Xuefeng Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
1. Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China 
 
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Abstract:
      A pot experiment was conducted to evaluate the effect of foliar Zn application on the concentrations, bioaccessibilities, and chemical forms of Cd and Zn in Brassica chinensis L. and to reveal the underlying mechanisms. ZnSO4 and EDTA · Na2Zn at different concentrations were applied as foliar fertilizers. The bioaccessibilities of Cd and Zn were determined using the in vitro digestion method, and the chemical forms of Cd and Zn were measured using the continuous extraction method. The relationship between the bioaccessibilities of Cd and Zn and their chemical forms was investigated using correlation analysis and linear regression. The results showed that the foliar Zn application had an insignificant effect on the Cd concentrations in the aboveground parts of B. chinensis, but the Zn concentrations increased significantly. The foliar application of ZnSO4 reduced the bioaccessibility percentages of Cd and Zn in B. chinensis with maximal reductions of 24.37% and 6.07%, respectively, whereas the foliar application of 4 mmol · L-1 EDTA · Na2Zn significantly increased the bioaccessible Cd concentration and the bioaccessibility percentage of Zn in B. chinensis with maximal increases of 49.19% and 8.40%, respectively. The foliar application of ZnSO4 reduced the proportion of ethanol extractable Zn in B. chinensis with a maximal reduction of 10.88%, whereas the foliar application of EDTA · Na2Zn increased the proportions of ethanol and deionized water extractable Cd and the proportion of ethanol extractable Zn in B. chinensis, with maximal increases of 25.59%, 52.74%, and 13.23%, respectively. The bioaccessible Cd and Zn concentrations in B. chinensis were highly significant correlated with the concentrations of Cd and Zn extracted using ethanol and deionized water, and the bioaccessibili percentages of Cd and Zn showed highly significant correlations with the proportions of ethanol and deionized water extractable Cd and Zn. These results indicate that ethanol and deionized water extractable Cd and Zn in B. chinensis are the main contributors to the bioaccessibilities of Cd and Zn, and foliar Zn application affects the bioaccessibilities of Cd and Zn through its effect on ethanol and deionized water extractable Cd and Zn.