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| Improving mechanism of carrot root tuber quality with cerium oxide nanomaterials |
| Received:January 28, 2024 |
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| KeyWord:CeO2 nanomaterials;carrot;yield;quality;metabolomics;molecular mechanism |
| Author Name | Affiliation | E-mail | | FENG Yan | Institute of Environmental Processes and Pollution Control, School of Environmental and Ecology, Jiangnan University, Wuxi 214122, China | | | LI Xiaona | Institute of Environmental Processes and Pollution Control, School of Environmental and Ecology, Jiangnan University, Wuxi 214122, China | | | CAO Xuesong | Institute of Environmental Processes and Pollution Control, School of Environmental and Ecology, Jiangnan University, Wuxi 214122, China | | | WANG Chuanxi | Institute of Environmental Processes and Pollution Control, School of Environmental and Ecology, Jiangnan University, Wuxi 214122, China | | | CHEN Feiran | Institute of Environmental Processes and Pollution Control, School of Environmental and Ecology, Jiangnan University, Wuxi 214122, China | | | YUE Le | Institute of Environmental Processes and Pollution Control, School of Environmental and Ecology, Jiangnan University, Wuxi 214122, China | leyue@jiangnan.edu.cn | | WANG Zhenyu | Institute of Environmental Processes and Pollution Control, School of Environmental and Ecology, Jiangnan University, Wuxi 214122, China | |
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| Abstract: |
| This study investigated the effects and mechanisms of 100 mL of CeO2 nanomaterials（NMs）on carrot growth, yield, and quality by applying different concentrations（1, 10, 50 mg·L-1）to soil for 4 d. The results showed that after the application of 1, 10, 50 mg·L-1 CeO2 NMs, the optimal concentration of CeO2 NMs for promoting growth and yield increase was observed to be 50 mg·L-1, which could be effectively absorbed by the roots of carrot seedlings and transferred to the leaves. The leaves of the treatment group contained 20.7 times more Ce particles than those of the control group, and the nutrient distribution between leaves and root tubers was optimized by promoting the synthesis of photosynthetic products in the leaves. Meanwhile, the formation and differentiation of carrot root tubers were improved by up-regulating the expression of β-carotene synthesis-related genes（PSY, ZDS, and LCYB up-regulated by 105.9%, 95.1%, and 68.9%） and increasing the content of hormones（ABA and IAA increased by 76.1% and 15.8%, respectively）. After harvesting at the mature stage, the contents of nutrients such as phosphorus, sulfur, manganese, iron, and zinc were significantly greater than in the control group, by 15.1%-101.1%; beta-carotene, soluble sugar, and ascorbic acid were 2.4, 1.5 times, and 1.8 times higher than those in the control group, respectively. In addition, by enhancing the amino acid and sugar contents and altering the biosynthesis and metabolism pathways of tryptophan and phenylalanine, carbon and nitrogen assimilation were regulated, thus affecting nutrient allocation and ultimately improving the quality of carrot root tubers. However, it should not be ignored that the carrot root tubers contained 11.0 and 2.9 times more Ce particles and Ce elements than those of the control group, respectively, and the potential environmental health risks require further investigation. |
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