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| Effects of passivating agents on physiological characteristics and cadmium accumulation in Spinacia oleracea L. under cadmium stress |
| Received:October 12, 2022 |
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| KeyWord:cadmium;passivating agent;Spinacia oleracea L.;antioxidant enzyme |
| Author Name | Affiliation | E-mail | | WANG Li | Institute of Soil and Fertilizer, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China | | | CAI Jinghang | Guiyang Rural Revitalization Service Centre, Guiyang 550081, China | | | LUO Muxinjian | Institute of Soil and Fertilizer, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China | | | WU Daoming | Guiyang Rural Revitalization Service Centre, Guiyang 550081, China | | | FAN Hongli | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/National Engineering Research Center of Arable Land Protection/Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture and Rural Affairs, Beijing 100081, China | | | QIN Song | Institute of Soil and Fertilizer, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China | | | FAN Chengwu | Institute of Soil and Fertilizer, Guizhou Academy of Agricultural Sciences, Guiyang 550006, China | gzfcw@163.com |
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| Abstract: |
| The aim of this study was to explore the effects of different passivating agents on the physiological characteristics and cadmium (Cd) accumulation by Spinacia oleracea L. under Cd stress. Pot experiments consisting of no passivating agent application(CK), a single application of nano-hydroxyapatite(nHAP), thiol biochar(TMB), nano-hydroxyapatite + thiol biochar(HPTB) were performed. The effects of different passivating agents on the growth and Cd accumulation of S.oleracea L. under Cd stress were determined by measuring the soil pH, available Cd content, and antioxidant enzyme activity of S.oleracea L. The results showed that the application of a passivating agent effectively increased the biomass and reduced the Cd content of S.oleracea L. Compared with the CK treatment, the nHAP, TMB, and HPTB treatments increased shoot(by 90.27%, 7.28%, and 143.75%, respectively) and root(by 72.50%, 4.81%, and 91.71%, respectively) biomass. Moreover, the Cd concentration decreased by 78.19%, 6.94%, and 65.49%, in the shoots, and by 65.98%, 39.34%, and 52.31% in the roots of plants in the nHAP, TMB, and HPTB treatments, respectively. Different passivators increased the soil pH and reduced the available Cd content of the soil. The soil pH under nHAP, TMB, and HPTB treatments increased by 1.36, 0.08 and 0.76 units, respectively, compared with the soil pH under CK treatment, and the available Cd content decreased by 83.22%, 22.57%, and 73.70%, respectively. nHAP treatment had the greatest effect on decreasing the Cd content in S.oleracea L. The application of nHAP increased the antioxidase activity, decreased the malondialdehyde content, and alleviated injury due to lipid membrane peroxidation. In conclusion, nHAP may be used as a passivator to alleviate the physiological effects of Cd stress on S.oleracea L. |
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