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| Effects of visible light photocatalytic reduction by nickel ferrite on the alleviation of Cr(Ⅵ) toxicity to rice(Oryza sativa L.)seedling growth |
| Received:June 02, 2021 |
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| KeyWord:photocatalysis;chromium toxicity;rice;aboveground;root;dry biomass |
| Author Name | Affiliation | E-mail | | LIU Qiuxia | State Key Laboratory of Biocatalysis and Enzyme Engineering/ School of Life Sciences, Hubei University, Wuhan 430062, China | | | PENG Chenglang | State Key Laboratory of Biocatalysis and Enzyme Engineering/ School of Life Sciences, Hubei University, Wuhan 430062, China
Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Wuhan 430062, China | | | MAO Jin | Oil Crops Research Institute of the Chinese Academy of Agricultural Sciences, Wuhan 430062, China | | | WEN Yue | State Key Laboratory of Biocatalysis and Enzyme Engineering/ School of Life Sciences, Hubei University, Wuhan 430062, China | | | SHENG Feng | State Key Laboratory of Biocatalysis and Enzyme Engineering/ School of Life Sciences, Hubei University, Wuhan 430062, China | | | DU Xuezhu | State Key Laboratory of Biocatalysis and Enzyme Engineering/ School of Life Sciences, Hubei University, Wuhan 430062, China | duxuezhusk@163.com |
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| Abstract: |
| Heavy metal pollution by Cr(Ⅵ)affects plant growth and development. Visible light catalysis is an effective method to reduce Cr(Ⅵ)pollution. To identify the effect of a nickel ferrite photocatalyst under visible light on the growth of rice contaminated with Cr(Ⅵ), a hydroponic test(Yoshida nutrient solution)was conducted. The rice varieties were 7 You 88 and 7 You 370. Three treatments were set, namely the contro(l CK), Cr(Ⅵ)stress treatment, and photocatalysis treatment. The seedling shoot length, root length, chlorophyll content, chromium content, dry matter, and chromium accumulation in varying treatments were investigated. The results showed that Cr(Ⅵ) contamination impeded the rice seedling shoot length and root length by 10.4%~14.6% and 57.8%~59.5%, respectively, relative to CK. In the Cr(Ⅵ)stress treatment, the chlorophyll content decreased by 38.4%~42.6%, the active oxygen scavenging system was destroyed, and there was 82.9%~86.6% more malondialdehyde accumulation. The aboveground Cr(Ⅵ)content was 66~130 times higher than that of CK. The rice seedling dry matter was reduced by 10.4%~13.1%. The seedling growth was severely restricted by Cr(Ⅵ)stress. Photocatalyst application significantly alleviated the Cr(Ⅵ)toxicity to rice plants. Compared with those of the Cr(Ⅵ)stress treatment, the shoot length and root length were increased by 17.6% and 73.8% on average in the photocatalysis treatment, respectively, and the aboveground Cr(Ⅵ) content, total chromium accumulation, and malondialdehyde content were decreased by 50.4%~50.7%, 25.9%~27.8%, and 28.9%~30.6%, respectively. Plant dry matter significantly increased by 4.9%~5.9% compared with that in the Cr(Ⅵ)stress treatment. However, the dry matter in the photocatalysis treatment was lower than that in CK, with a decrease of 5.1%~8.9%. Cr(Ⅵ)stress remarkably inhibite rice seedling growth, and visible-light photocatalysis of nickel ferrite plays an important role in Cr(Ⅵ)toxicity alleviation. |
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