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Isotopic fingerprints indicate distinct strategies of Fe uptake by rice plant
Chengshuai Liu;  Ting Gao;  Yuhui Liu;   Jingyu Liu;  Fangbai Li;  Zhenwu Chen;  Yongzhu Li;  Yiwen Lv;  Zhiyi Song;  John R. Reinfelder;  Weilin Huang
2019
发表期刊Chemical Geology
卷号524页码:323-328
摘要

Plants typically take up Fe through either strategy I or strategy II, whereas rice uses both. Stable Fe isotopes potentially reveal pathways of Fe uptake in rice plants. In this study we measured Fe isotopic compositions of rice grown under different conditions, i.e. paddy soil with deficient Fe supply and Fe3+-EDTA aqueous solution with sufficient Fe supply, to investigate whether Fe isotope fractionation is distinct under Fe-deficient and Fe-sufficient conditions as well as their possible controlling mechanisms. Our results show that rice grown in the Fe3+-EDTA aqueous solutions with sufficient Fe supply preferentially takes up light Fe isotopes (Δ56Febulk plant-nutrient = −1.36‰) and accumulates Fe in different parts of plant (roots, stems, leaves, husks, and grains) with large Fe isotope fractionation. Under such a growing condition, rice takes up Fe through strategy I and the reduction of Fe3+ to Fe2+ results in plants enriching isotopically light Fe. Within the plant, the transportation of Fe is accompanied with changes in redox state, which thus causes significant Fe isotope fractionation among different plant tissues. In contrast, rice plants grown in soils with deficient Fe supply are slightly enriched in heavy Fe isotopes (Δ56Febulk plant-soil solution = 0.27‰) and accumulate Fe in different plant tissues with little isotope fractionation. Under this growing condition, the rice plant takes up Fe through strategy II. Plants take up Fe from soils as Fe3+-phytosiderophores (Fe3+-PS) complex and transport Fe as Fe3+-nicotianamine (Fe3+-NA) complex throughout the plant, which does not involve changes in redox state and thus results in very limited isotope fractionation. The observed difference in Fe isotope fractionation indicates two distinct Fe uptake and translocation strategies for rice grown under the two different conditions: strategy I under Fe-sufficient conditions, and strategy II under Fe-deficient conditions. Our results demonstrate that Fe isotope ratios may be used to distinguish Fe-sufficient versus Fe-deficient conditions and to elucidate Fe biogeochemical processes during rice growth.

关键词Fe Isotope Fractionation rice strategy I strategy Ii uptaketranslocation
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10507
专题环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Sciences & Technology, Guangzhou 510650, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Department of Environmental Sciences, Rutgers, The State University of New Jersey, 14 College Farm Road, New Brunswick, NJ 08901, United States
5.CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
6.CAS Center for Excellence in Quaternary Science and Global Change, Xi'an 710061, China
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GB/T 7714
Chengshuai Liu;Ting Gao;Yuhui Liu; Jingyu Liu;Fangbai Li;Zhenwu Chen;Yongzhu Li;Yiwen Lv;Zhiyi Song;John R. Reinfelder;Weilin Huang. Isotopic fingerprints indicate distinct strategies of Fe uptake by rice plant[J]. Chemical Geology,2019,524:323-328.
APA Chengshuai Liu;Ting Gao;Yuhui Liu; Jingyu Liu;Fangbai Li;Zhenwu Chen;Yongzhu Li;Yiwen Lv;Zhiyi Song;John R. Reinfelder;Weilin Huang.(2019).Isotopic fingerprints indicate distinct strategies of Fe uptake by rice plant.Chemical Geology,524,323-328.
MLA Chengshuai Liu;Ting Gao;Yuhui Liu; Jingyu Liu;Fangbai Li;Zhenwu Chen;Yongzhu Li;Yiwen Lv;Zhiyi Song;John R. Reinfelder;Weilin Huang."Isotopic fingerprints indicate distinct strategies of Fe uptake by rice plant".Chemical Geology 524(2019):323-328.
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