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| Effect of foliar application of different manganese fertilizers on cadmium accumulation and subcellular distribution in pak choi |
| Received:May 24, 2019 |
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| KeyWord:cadmium;Brassica chinensis;manganese;foliar spraying;low cadmium accumulating cultivar;subcellular distribution |
| Author Name | Affiliation | E-mail | | YAN Xiu-xiu | 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 Ying-ming | 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 | | TAO Xue-ying | 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 Yue-bing | 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 Xue-feng | 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 | |
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| Abstract: |
| In order to test the effect of foliar application of manganese (Mn) fertilizers on cadmium (Cd) accumulation in pak choi (Brassica chinensis), three different forms of Mn, MnSO4, Mn (CH3COO)2 and EDTA·Na2Mn, were sprayed among two pak choi cultivars (Huajun and Hanlv) in a pot experiment. We examined the biomass, Cd and Mn concentrations, Cd uptake and transport, and Cd and Mn subcellular distribution in pak choi. The results show that foliar application of Mn had no significant effect on the shoot and root biomasses of the low Cd-accumulating cultivar (Huajun); however, the foliar application of high dosages of Mn (CH3COO)2 and EDTA·Na2Mn significantly reduced shoot biomass in the common cultivar of pak choi (Hanlv). Foliar application with MnSO4 and Mn (CH3COO)2 resulted in greater alleviation of shoot Cd concentrations and a more notable enhancement of shoot Mn concentrations in pak choi than by spraying with EDTA·Na2Mn. Shoot Cd concentrations in Huajun were the lowest under foliar feeding with 0.4 g·L-1Mn (MnSO4) and 0.2 g·L-1Mn[Mn (CH3COO)2],which were decreased by 29.2% and 31.0%, respectively. Foliar Mn application reduced the total Cd accumulation significantly and increased the Cd transfer factor of pak choi markedly. The shoot Cd concentration of pak choi was positively correlated (P<0.01) with total Cd accumulation; however, it was not significantly correlated with the Cd transfer factor. In shoots of pak choi, the majority of Cd and Mn were associated with the soluble fraction, followed by the cell wall fraction. After foliar Mn application, the proportions of Cd and Mn in the cell wall fraction decreased and those in the soluble fraction increased. In summary, foliar feeding with 0.4 g·L-1Mn (MnSO4) and 0.2 g·L-1Mn[Mn (CH3COO)2] significantly reduced Cd concentrations and increased Mn concentrations in shoots, and it did not affect the growth of Huajun, which is suitable for the safe and high-quality production of pak choi. |
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