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Meng FL, Zhang X, Hu Y, Sheng GP. New Barrier Role of Iron Plaque: Producing Interfacial Hydroxyl Radicals to Degrade Rhizosphere Pollutants. Environ Sci Technol 2024; 58:795-804. [PMID: 38095914 DOI: 10.1021/acs.est.3c08132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
Iron plaque, as a natural barrier between rice and soil, can reduce the accumulation of pollutants in rice by adsorption, contributing to the safe production of rice in contaminated soil. In this study, we unveiled a new role of iron plaque, i.e., producing hydroxyl radicals (·OH) by activating root-secreted oxygen to degrade pollutants. The ·OH was produced on the iron plaque surface and then diffused to the interfacial layer between the surface and the rhizosphere environment. The iron plaque activated oxygen via a successive three-electron transfer to produce ·OH, involving superoxide and hydrogen peroxide as the intermediates. The structural Fe(II) in iron plaque played a dominant role in activating oxygen rather than the adsorbed Fe(II), since the structural Fe(II) was thermodynamically more favorable for oxygen activation. The oxygen vacancies accompanied by the structural Fe(II) played an important role in oxygen activation to produce ·OH. The interfacial ·OH selectively degraded rhizosphere pollutants that could be adsorbed onto the iron plaque and was less affected by the rhizosphere environments than the free ·OH. This study uncovered the oxidative role of iron plaque mediated by its produced ·OH, reshaping our understanding of the role of iron plaque as a barrier for rice.
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Affiliation(s)
- Fan-Li Meng
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Xin Zhang
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Yi Hu
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China
| | - Guo-Ping Sheng
- CAS Key Laboratory of Urban Pollutant Conversion, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei 230026, China
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Hu H, Bi L, Wang L, Zhan F, Liang X, Qin L, Li Y. The effects of different iron and phosphorus treatments on the formation and morphology of iron plaque in rice roots ( Oryza sativa L). Front Plant Sci 2024; 14:1304505. [PMID: 38259909 PMCID: PMC10800492 DOI: 10.3389/fpls.2023.1304505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 12/15/2023] [Indexed: 01/24/2024]
Abstract
Introduction Rice (Oryza sativa L.) is a pivotal cereal crop worldwide. It relies heavily on the presence of iron plaque on its root surfaces for optimal growth and enhanced stress resistance across diverse environmental conditions. Method To study the crystallographic aspects of iron plaque formation on rice roots, the concentrations of Fe2+ and PO4 3- were controlled in this study. The effects of these treatments were assessed through comprehensive analyzes encompassing root growth status, root surface iron concentration, root vitality, enzyme activities, and microstructural characteristics using advanced techniques such as root analysis, scanning electron microscopy (SEM), and ultrathin section transmission electron microscopy (TEM). Results The results demonstrated that an increase in the Fe2+ concentration or a decrease in the PO4 3- concentration in the nutrient solution led to improvements in various root growth indicators. There was an elevation in the DCB (dithionite-citrate-bicarbonate) iron content within the roots, enhanced root vitality, and a significant increase in the activities of the superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) enzymes. Moreover, as the Fe2+ concentration increased, amorphous iron oxide minerals on the root surface were gradually transformed into ferrihydrite particles with sizes of approximately 200 nm and goethite particles with sizes of approximately 5 μm. This study showed that an increase in the Fe2+ concentration and a decrease in the PO4 3- concentration led to the formation of substantial iron plaque on the root surfaces. It is noteworthy that there was a distinct gap ranging from 0.5 to 3 μm between the iron plaque formed through PO4 3- treatment and the cellular layer of the root surface. Discussion This study elucidated the impacts of Fe2+ and PO4 3- treatments on the formation, structure, and morphology of the iron plaque while discerning variations in the spatial proximity between the iron plaque and root surface under different treatment conditions.
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Affiliation(s)
| | | | | | | | - Xinran Liang
- College of Resources and Environment, Yunnan Agricultural University, Kunming, China
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Zhang PX, Yao JF, Liu YL, Zhang WY, Yin XF, Tie BQ. [Effect of Combined Application of an Enterobacter and Sulfur Fertilizer on Cadmium and Arsenic Accumulation in Rice]. Huan Jing Ke Xue 2023; 44:7036-7044. [PMID: 38098426 DOI: 10.13227/j.hjkx.202211110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
The aim of this study was to explore the effects of different sulfur fertilizers combined with sulfate-reducing bacteria on the accumulation of cadmium and arsenic in rice and the formation of iron plaque under long-term flooding conditions and to provide a reference for the safe production of rice fields polluted by moderate and mild cadmium and arsenic. We adopted a pot experiment, selecting two sulfur fertilizers, sulfur and calcium sulfate, and Enterobacter M5 with sulfate-reducing ability, and designed six treatments of single application and combined application of different sulfur fertilizers and M5. The results showed that the combined application of calcium sulfate and M5(CM5) had the best effect on reducing available cadmium and arsenic in rice rhizosphere soil. The combined application of sulfur fertilizer or M5 could reduce the content of cadmium and inorganic arsenic in early season rice grains by 8%-51% and 42%-61%, respectively, under flooding conditions. The content of cadmium and inorganic arsenic in late rice grains decreased by 81%-92% and 41%-62%, respectively. The treatment of the combined application of sulfur and M5(SM5) and CM5 had the best effect on reducing cadmium and arsenic content in both early and late season rice grains. SM5 and CM5 could promote the adsorption of cadmium and arsenic by iron plaque, and the extracted cadmium and arsenic content of ACA in both treatments was significantly higher than that of CK. The extracted iron content of ACA in the CM5 treatment was also significantly higher than that of CK, which indicates that the combined application of calcium sulfate and M5 would promote the formation of iron plaque. The results showed that the combined application of sulfur fertilizer and M5 was better than single application in reducing the content of cadmium and arsenic in grains, whereas the combined application of calcium sulfate and M5 was the best and most stable method.
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Affiliation(s)
- Pu-Xin Zhang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
- Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
- Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China
| | - Jun-Fan Yao
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
- Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
- Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China
| | - Yu-Ling Liu
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
- Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
- Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China
| | - Wei-Yu Zhang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
- Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
- Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China
| | - Xue-Fei Yin
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
- Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
- Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China
| | - Bo-Qing Tie
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
- Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China
- Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China
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Wu JM, Xie YH, Guan D, Chen S, Chen J, Long SP, Ji XH. [Effects of Equal Amounts Silicon Fertilizer Application on Soil Bioavailability of Cadmium and Cadmium Uptake by Rice]. Huan Jing Ke Xue 2023; 44:5727-5736. [PMID: 37827788 DOI: 10.13227/j.hjkx.202210029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 10/14/2023]
Abstract
Cadmium (Cd) contamination of paddy fields is a global concern, as it can cause the accumulation of Cd in food. To explore the effects of equal application of silicon fertilizers on the bioavailability of cadmium and soil Cd uptake at different growth stages of rice, a field experiment was conducted with five silicon fertilizers under the same silicon dose (225 kg·hm-2). The results revealed that the Cd contents in roots, stems, and leaves increased with the extension of the rice growth stage. The application of silicon fertilizers reduced the Cd contents in roots, stems, and leaves in brown rice by 14.9%, 28.2%, and 12.2%, respectively. Compared with that in the control, the Cd content of brown rice in the SiCaMgFe and SiW treatments was decreased by 21.1% (P<0.05) and 21.2% (P<0.05), respectively. Similarly, Cd content in iron plaque (DCB-Cd) increased with the extension of the rice growth period, which accounted for 15.8%-42.8% of the total Cd content in roots, and the DCB-Cd content was different in each stage of rice. The content of exchangeable Cd (Exc-Cd) in soil at the mature stage of rice decreased by 36.4%, and the other fractions increased by 12.5%-48.2%. The results showed significant negative correlations between the Cd contents and Si in roots, DCB-Cd and soil available Cd and available Si, Exc-Cd and Car-Cd, and soil available Cd and pH value. Cd content in roots was positively correlated with DCB-Cd. With the equal dose of silicon fertilizer, the treatments of SiCaMgFe and SiW could effectively reduce the Cd content in rice. The application of silicon fertilizer promoted the transfer of Exc-Cd to Carb-Cd by increasing the soil pH value and the soil available Si content, meanwhile reducing the soil available Cd, Exc-Cd contents, the adsorption of Cd by the iron film on the root surface, and the adsorption capacity of iron plaque and root, thereby reducing the absorption of Cd by rice.
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Affiliation(s)
- Jia-Mei Wu
- Key Laboratory of Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Hunan Institute of Agro-Environment Ecology, Changsha 410125, China
- Hunan Engineering Research Center for Prevention and Control of Agricultural Non-point Source Pollution in the Basin of Lake Dongting, Changsha 410125, China
| | - Yun-He Xie
- Key Laboratory of Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Hunan Institute of Agro-Environment Ecology, Changsha 410125, China
- Key Laboratory of Hunan Province, Prevention, Control and Remediation of Heavy Meatal Pollution of the Farmlands, Changsha 410125, China
| | - Di Guan
- Key Laboratory of Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Hunan Institute of Agro-Environment Ecology, Changsha 410125, China
- Key Laboratory of Hunan Province, Prevention, Control and Remediation of Heavy Meatal Pollution of the Farmlands, Changsha 410125, China
| | - Shan Chen
- Key Laboratory of Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Hunan Institute of Agro-Environment Ecology, Changsha 410125, China
- Key Laboratory of Hunan Province, Prevention, Control and Remediation of Heavy Meatal Pollution of the Farmlands, Changsha 410125, China
| | - Jin Chen
- Key Laboratory of Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Hunan Institute of Agro-Environment Ecology, Changsha 410125, China
- Key Laboratory of Hunan Province, Prevention, Control and Remediation of Heavy Meatal Pollution of the Farmlands, Changsha 410125, China
| | - Shi-Ping Long
- Key Laboratory of Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Hunan Institute of Agro-Environment Ecology, Changsha 410125, China
| | - Xiong-Hui Ji
- Key Laboratory of Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs, Hunan Institute of Agro-Environment Ecology, Changsha 410125, China
- Key Laboratory of Hunan Province, Prevention, Control and Remediation of Heavy Meatal Pollution of the Farmlands, Changsha 410125, China
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Li LF, Wen WF, Xu ZS, Chen Y, Li Q, Li YC. [Effects of Silicon Application on Arsenic Sequestration in Iron Plaque and Arsenic Translocation in Rice]. Huan Jing Ke Xue 2023; 44:2899-2907. [PMID: 37177961 DOI: 10.13227/j.hjkx.202206143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The As sequestration by iron plaque and the As translocation in rice significantly affect the As accumulation in brown rice, and silicon (Si) application inhibits the As accumulation in rice plants. However, little information is available concerning the effect of Si application on As sequestration by iron plaque and translocation in rice. In this study, a pot experiment using As-contaminated paddy soil with different Si supply levels was conducted to investigate the effects of Si application on the As sequestration by iron plaque on the root surface and the As translocation from different tissues to brown rice. The results showed that the Si2 (0.66 g·kg-1) treatment significantly increased the activities of CAT (1.81 times), SOD (7.98 times), and POD (1.25 times) in the roots, increased the DCB-extractable Fe concentration (44.35%), and promoted the roughness of iron plaque (108.91%), resulting in a significant increase in the DCB-extractable As concentration of iron plaque (88.32%). Moreover, the Si2 treatment significantly promoted the As accumulation in the roots and inhibited the As translocation from the roots and leaves to the brown rice, leading to a significant decrease in the brown rice As concentration (53.12%). The increase in As sequestration by iron plaque with Si application was attributed to the enhancement of iron plaque formation and the promotion of surface roughness of iron plaque, whereas the inhibition of As translocation from the roots and leaves to the brown rice in the Si application treatment was closely related to the competition between Si with As for transporters and the promotion of As-thiol complex formation and As compartmentalization in vacuolar. These findings provide more insight into the mechanisms of As translocation in rice and will be helpful for exploring strategies to reduce rice grain As through Si supply in As-contaminated paddy fields in South China.
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Affiliation(s)
- Lin-Feng Li
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
- Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
- Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China
| | - Wei-Fa Wen
- Institute of Animal Health Supervision, Shitan Branch, Zengcheng District, Guangzhou 511330, China
| | - Zi-Sheng Xu
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
- Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
- Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China
| | - Yong Chen
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
- Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
- Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China
| | - Qi Li
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
- Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
- Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China
| | - Yi-Chun Li
- Institute of Agricultural Resources and Environment, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China
- Key Laboratory of Plant Nutrition and Fertilizer in South Region, Ministry of Agriculture, Guangzhou 510640, China
- Guangdong Key Laboratory of Nutrient Cycling and Farmland Conservation, Guangzhou 510640, China
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Wei L, Zhu Z, Razavi BS, Xiao M, Dorodnikov M, Fan L, Yuan H, Yurtaev A, Luo Y, Cheng W, Kuzyakov Y, Wu J, Ge T. Visualization and quantification of carbon "rusty sink" by rice root iron plaque: Mechanisms, functions, and global implications. Glob Chang Biol 2022; 28:6711-6727. [PMID: 35986445 DOI: 10.1111/gcb.16372] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Revised: 07/15/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
Paddies contain 78% higher organic carbon (C) stocks than adjacent upland soils, and iron (Fe) plaque formation on rice roots is one of the mechanisms that traps C. The process sequence, extent and global relevance of this C stabilization mechanism under oxic/anoxic conditions remains unclear. We quantified and localized the contribution of Fe plaque to organic matter stabilization in a microoxic area (rice rhizosphere) and evaluated roles of this C trap for global C sequestration in paddy soils. Visualization and localization of pH by imaging with planar optodes, enzyme activities by zymography, and root exudation by 14 C imaging, as well as upscale modeling enabled linkage of three groups of rhizosphere processes that are responsible for C stabilization from the micro- (root) to the macro- (ecosystem) levels. The 14 C activity in soil (reflecting stabilization of rhizodeposits) with Fe2+ addition was 1.4-1.5 times higher than that in the control and phosphate addition soils. Perfect co-localization of the hotspots of β-glucosidase activity (by zymography) with root exudation (14 C) showed that labile C and high enzyme activities were localized within Fe plaques. Fe2+ addition to soil and its microbial oxidation to Fe3+ by radial oxygen release from rice roots increased Fe plaque (Fe3+ ) formation by 1.7-2.5 times. The C amounts trapped by Fe plaque increased by 1.1 times after Fe2+ addition. Therefore, Fe plaque formed from amorphous and complex Fe (oxyhydr)oxides on the root surface act as a "rusty sink" for organic matter. Considering the area of coverage of paddy soils globally, upscaling by model revealed the radial oxygen loss from roots and bacterial Fe oxidation may trap up to 130 Mg C in Fe plaques per rice season. This represents an important annual surplus of new and stable C to the existing C pool under long-term rice cropping.
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Affiliation(s)
- Liang Wei
- Key Laboratory of Agro-ecological Processes in Subtropical Region & Changsha Research Station for Agricultural and Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan, China
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China
| | - Zhenke Zhu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China
| | - Bahar S Razavi
- Department of Soil and Plant Microbiome, Institute of Phytopathology, Christian-Albrechts-University of Kiel, Kiel, Germany
| | - Mouliang Xiao
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China
| | - Maxim Dorodnikov
- Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science, University of Goettingen, Goettingen, Germany
- Research Institute of Ecology and Natural Resources Management, Tyumen State University, Tyumen, Russia
| | - Lichao Fan
- Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science, University of Goettingen, Goettingen, Germany
- College of Natural Resources and Environment, Northwest A&F University, Yangling, China
| | - Hongzhao Yuan
- Key Laboratory of Agro-ecological Processes in Subtropical Region & Changsha Research Station for Agricultural and Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan, China
| | - Andrey Yurtaev
- Research Institute of Ecology and Natural Resources Management, Tyumen State University, Tyumen, Russia
| | - Yu Luo
- Institute of Soil and Water Resources and Environmental Science, Zhejiang Provincial Key Laboratory of Agricultural Resources and Environment, Zhejiang University, Hangzhou, China
| | - Weiguo Cheng
- Faculty of Agriculture, Yamagata University, Tsuruoka, Japan
| | - Yakov Kuzyakov
- Key Laboratory of Agro-ecological Processes in Subtropical Region & Changsha Research Station for Agricultural and Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan, China
- Department of Soil Science of Temperate Ecosystems, Department of Agricultural Soil Science, University of Goettingen, Goettingen, Germany
- Peoples Friendship University of Russia (RUDN University), Moscow, Russia
| | - Jinshui Wu
- Key Laboratory of Agro-ecological Processes in Subtropical Region & Changsha Research Station for Agricultural and Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan, China
| | - Tida Ge
- Key Laboratory of Agro-ecological Processes in Subtropical Region & Changsha Research Station for Agricultural and Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan, China
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Plant Virology, Ningbo University, Ningbo, China
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Wang J, Yuan R, Zhang Y, Si T, Li H, Duan H, Li L, Pan G. Biochar decreases Cd mobility and rice (Oryza sativa L.) uptake by affecting soil iron and sulfur cycling. Sci Total Environ 2022; 836:155547. [PMID: 35504381 DOI: 10.1016/j.scitotenv.2022.155547] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 04/22/2022] [Accepted: 04/22/2022] [Indexed: 06/14/2023]
Abstract
Biochar has been used as an amendment in Cd-contaminated soils. However, the mechanisms of which biochar reduce Cd mobility and rice (Oryza sativa L.) Cd uptake by modifying the iron and sulfur cycling in soil has rarely been addressed in the literature. A pot experiment has been carried out with two Cd-contaminated paddy soils (FG and DBS) from South China. Rice straw biochar (RSB) and rape straw biochar (RASB) pyrolyzed at 450 °C were applied at 0, 0.5, and 1% (w/w), respectively. The results showed that biochar amendment at a rate of 1% reduced grain Cd concentrations by 29.3-35.2%. Furthermore, biochar significantly reduced the Cd concentration of root, while the decline of Cd concentration by RASB treatment was higher than by RSB treatment. Root Cd in RASB0.5 was significantly reduced by 56.4-51.8% compared to than that in RSB0.5 at the maturing stage. Biochar reduced soil acid-soluble Cd by 15.9-25.3% with the increase of pH at the maturing stage in FG soil, and 30.1-59.3% by promoting soil into more reductive condition at the heading stage in DBS soil with higher contents of Fe and S. In addition, biochar impeded Cd transport from soil to rice roots by increasing the formation of iron plaque at the flooding stage. Owing to the influence of RASB1, DCB-Cd concentration increased significantly, with 99.7% at the heading stage in FG soil and 237.9% at the tillering stage in DBS soil, respectively. Furthermore, RASB with a higher sulfur concentration had a more positive effect on Cd immobilization and iron plaque formation compared to RSB. As a conclusion, this study suggested that biochar might be able to promote the Cd immobilization by affecting the cycling of iron and sulfur in soil.
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Affiliation(s)
- Jingbo Wang
- Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, China
| | - Rui Yuan
- Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, China
| | - Yuhao Zhang
- Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, China
| | - Tianren Si
- Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, China
| | - Hao Li
- Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, China
| | - Huatai Duan
- Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, China
| | - Lianqing Li
- Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, China.
| | - Genxing Pan
- Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, China
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Wang X, Jiang J, Dou F, Li X, Sun W, Ma X. Zinc Fertilizers Modified the Formation and Properties of Iron Plaque and Arsenic Accumulation in Rice ( Oryza sativa L.) in a Life Cycle Study. Environ Sci Technol 2022; 56:8209-8220. [PMID: 35623092 DOI: 10.1021/acs.est.2c01767] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
This study examined the effect of three forms of zinc fertilizers on arsenic (As) accumulation and speciation in rice tissues over the life cycle of this cereal crop in a paddy soil. The formation and properties of iron plaque on rice roots at the maximum tillering stage and the mature stage were also determined. Elevated As at 5 mg/kg markedly lowered the rice yield by 86%; however, 100 mg/kg Zn fertilizers significantly increased the rice yield by 354-686%, regardless of the Zn form. Interestingly, only Zn2+ significantly lowered the total As in rice grains by 17% to 3.5 mg/kg and As(III) by 64% to around 0.5 mg/kg. Zinc amendments substantially hindered and, in the case of zinc oxide bulk particles (ZnOBPs), fully prevented the crystallization of iron oxides (Fe3O4 and Fe2O3) and silicon oxide (SiO2) and altered the composition of iron plaques on rice roots. SiO2 was first reported to be a significant component of iron plaque. Overall, ZnOBPs, ZnO nanoparticles, and Zn2+ displayed significant yet distinctive effects on the properties of iron plaque and As accumulation in rice grains, providing a fresh perspective on the potentially unintended consequences of different Zn fertilizers on food safety.
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Affiliation(s)
- Xiaoxuan Wang
- Zachry Department of Civil and Environmental Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Jiechao Jiang
- Department of Materials Science and Engineering, University of Texas Arlington, Arlington, Texas 76019, United States
| | - Fugen Dou
- Texas A&M AgriLife Research Center at Beaumont, Texas A&M University System, Beaumont, Texas 77713, United States
| | - Xiufen Li
- Texas A&M AgriLife Research Center at Beaumont, Texas A&M University System, Beaumont, Texas 77713, United States
| | - Wenjie Sun
- Department of Atmospheric and Hydrologic Science, St. Cloud State University, St. Cloud, Minnesota 56301, United States
| | - Xingmao Ma
- Zachry Department of Civil and Environmental Engineering, Texas A&M University, College Station, Texas 77843, United States
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Zhong S, Li X, Li F, Liu T, Huang F, Yin H, Chen G, Cui J. Water Management Alters Cadmium Isotope Fractionation between Shoots and Nodes/Leaves in a Soil-Rice System. Environ Sci Technol 2021; 55:12902-12913. [PMID: 34520188 DOI: 10.1021/acs.est.0c04713] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The drainage of rice soils increases Cd solubility and results in high Cd concentrations in rice grains. However, plant Cd uptake is limited by sorption to iron plaques, and Cd redistribution in the plant is regulated by the nodes. To better understand the interplay of Cd uptake and redistribution in rice under drained and flooded conditions, we determined stable Cd isotope ratios and the expression of genes coding transporters that can transport Cd into the plant cells in a pot experiment. In soil, both water management practices showed similar patterns of isotope variation: the soil solution was enriched in heavy isotopes, and the root Fe plaque was enriched in light isotopes. In rice, the leaves were heavier (Δ114/110Cdleaf-shoot = 0.17 to 0.96‰) and the nodes were moderately lighter (Δ114/110Cdnode-shoot = -0.26 to 0.00‰) relative to the shoots under flooded conditions, indicating preferential retention of light isotopes in nodes and export of heavy isotopes toward leaves. This is generally reversed under drained conditions (Δ114/110Cdleaf-shoot = -0.25 to -0.04‰, Δ114/110Cdnode-shoot = 0.10 to 0.19‰). The drained treatment resulted in significantly higher expression of OsHMA2 and OsLCT1 (phloem loading) but lower expression of OsHMA3 (vacuolar sequestration) in nodes and flag leaves relative to the flooded treatment. It appeared that OsHMA2 and OsLCT1 might preferentially transport isotopically heavier Cd, and the excess Cd was purposefully retranslocated via the phloem under drained conditions when the vacuoles could not retain more Cd. Cd in seeds was isotopically heavier than that in stems under both water management practices, indicating that heavy isotopes were preferentially transferred toward seeds via the phloem, leaving light isotopes retained in stems. These findings demonstrate that the Fe plaque preferentially adsorbs and occludes light Cd isotopes on the root surface, and distinct water management practices alter the gene expression of key transporters in the nodes, which corresponds to a change in isotope fractionation between shoots and nodes/leaves.
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Affiliation(s)
- Songxiong Zhong
- National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China
- Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiaomin Li
- SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, China
| | - Fangbai Li
- National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China
| | - Tongxu Liu
- National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China
| | - Fang Huang
- 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
| | - Haoming Yin
- 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
| | - Guojun Chen
- National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China
| | - Jianghu Cui
- National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, China
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10
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Zhang YT, Tian YB, Huang DY, Zhang Q, Xu C, Zhu HH, Zhu QH. [Effects of Water Management on Cadmium Accumulation by Rice ( Oryza sativa L.) Growing in Typical Paddy Soil]. Huan Jing Ke Xue 2021; 42:2512-2521. [PMID: 33884822 DOI: 10.13227/j.hjkx.202008305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In order to explore the effects of water management on the Cd accumulation of rice in paddy soils with different parent materials, a pot experiment with three paddy soils with different parent materials from Hunan Province (granite sandy soil, plate shale soil, and purple sandy shale soil) with different water management treatments [flooding and alternate wetting and drying (AWD)] was performed. The soil pH, DTPA-Cd, Fe plaque in the rice roots, and heavy metal concentration in the rice were determined. The results showed that the soil pH of the three paddy soils under the flooding treatment was increased by 0.17-1.33 units. During the filling and maturity periods, compared with that under AWD, the DTPA-Cd concentration in the three paddy soils was reduced by 14.39%-36.56% under the flooding treatment, but the DTPA-Fe concentration was increased by 35.35%-347.25%. In the three growth stages, the Cd and Mn concentrations in the Fe plaque (except for DCB-Fe) were in the order of tillering stage < filling stage < mature stage. Compared with that under AWD, the brown rice Cd concentration in the three soils was reduced by 57.84%-93.79% under flooding treatment. The Cd accumulation in rice was reduced under flooding treatment by reducing the DTPA-Cd via increasing the soil pH and DTPA-Fe and by decreasing the formation of Fe plaque. According to the results of the correlation and SEM analysis, the soil pH and DCB-Cd were the main factors affecting the Cd accumulation in rice grains, although the changes in the DTPA-Cd and DTPA-Fe also impacted the Cd in rice grains. In summary, our study demonstrated that water management had a significant impact on the Cd content in rice, and there were significant differences among the three paddy soils with different parent materials. In conclusion, the Cd content in rice grains was affected by the soil parent material, soil physicochemical properties, and Fe plaque on the surface of the rice roots. The granite sandy soil and plate shale soil with different water management treatments had significant impacts on the contents of heavy metals in rice. Continuous flooding is a valuable strategy for improving soil acidity and alkalinity and minimizing soil available Cd, but the soil parent materials must be considered.
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Affiliation(s)
- Yu-Ting Zhang
- College of Agronomy, Yangtze University, Jingzhou 434025, China
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
| | - Ying-Bing Tian
- College of Agronomy, Yangtze University, Jingzhou 434025, China
| | - Dao-You Huang
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
| | - Quan Zhang
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
| | - Chao Xu
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
| | - Han-Hua Zhu
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
| | - Qi-Hong Zhu
- Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
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11
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Chu SY, Jing CX, Zhang XY, Huang ZD, Xiao JB. [Remediation performance and mechanism of aquatic plants for iron polluted water]. Ying Yong Sheng Tai Xue Bao 2020; 31:608-614. [PMID: 32476355 DOI: 10.13287/j.1001-9332.202002.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
To solve the yellow colorization in water caused by iron ion, we evaluated the remediation performances of six aquatic plant species (Hygroryza aristata, Myriophyllum verticillatum, Hydrocotyle verticillata, Jussiaea stipulacea, Pistia stratiotes and Rotala rotundifolia) using hydroponic experiment. Effects of iron concentration, pH, plant biomass on iron removal were investigated, and the intensification of removing iron incurred by aeration was also discussed. Results showed that all the examined plant species could improve both divalent iron and total iron removal, but with significant difference in their performance. Divalent iron concentrations were decreased by H. aristata and H. verticillata from 5.0 mg·L-1 to 0.23 and 0.26 mg·L-1 within 24 h, respectively, meeting the standard of supplementary items for the drinking water and surface water sources (divalent iron concentration ≤0.3 mg·L-1), while total iron concentrations declined to 0.84 and 1.21 mg·L-1 with removal efficiency of 83.2% and 75.8%, respectively. Concentrations of divalent iron and total iron of plant treatment plots at pH 5, 6, 7, 8 were not significantly different, with removal efficiency of divalent iron and total iron being among 95.4%-98.4% and 92.2%-94.6%, separately. When initial divalent iron concentration was less than 5.0 mg·L-1, removal efficiency of divalent iron and total iron increased with the increases of divalent iron concentration. The growth of H. aristata was inhibited at divalent iron concentration of 10.0 mg·L-1. Total iron removal was not stable during the trial. Removal efficiency of plant treatment rose only by 7.0% compared with the control, which was much lower than other concentration treatments. The divalent iron concentration was decreased to < 0.3 mg·L-1 in 24 h at plant biomass :300 g, with no difference of removal efficiency among biomass treatments. Both intermittent and continuous aeration enhanced iron removal by H. aristata, but continuous aeration was more favorable for the removal of total iron due to stabilization.
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Affiliation(s)
- Shu-Yi Chu
- Wenzhou Academy of Agricultural Sciences, Wenzhou 325006, Zhejiang, China
| | - Chuang-Xin Jing
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, Zhejiang, China
| | - Xia-Ying Zhang
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, Zhejiang, China
| | - Zhi-da Huang
- Wenzhou Institute of Industry & Science, Wenzhou 325028, Zhejiang, China
- Wenzhou Chuangyuan Environment Technology Co. Ltd., Wenzhou 325036, Zhejiang, China
| | - Ji-Bo Xiao
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, Zhejiang, China
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12
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Abstract
Cadmium tolerant plant, Echinodorus osiris Rataj, was selected to study its root adaptive mechanism under Cd stress. The change of root porosity, radial oxygen loss (ROL), and iron plaque formation was investigated. Results suggested that Cd treatment decreased 28.6-49.9% of ROL and reduced 13.5-23.3% of root porosity but increased 63.4-147.2% of iron plaque after 21 days, respectively. Under different Cd treatments, the uptake of Cd in root presented quick and mild models while it showed relatively consistent increase in shoot. Correlation analysis demonstrated that Cd concentrations in plant were related negatively with root porosity but had no significant correlation with ROL. There was significant positive correlation between root porosity and ROL; however, they both related negatively with root iron plaque. Moreover, the scanning electron microscopy indicates a barrier to the movement of Cd in endodermis layers.
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Affiliation(s)
- Peng Zhang
- Guangdong Provincial Academy of Environmental Science, Guangzhou, P.R. China
| | - Qinfeng Li
- Liuzhou Agricultural Technology Extension Center, Liuzhou, P.R. China
| | - Chaolan Zhang
- School of Resource, Environment and Materials, Guangxi University, Nanning, P.R. China
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13
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Huang G, Ding C, Yu X, Yang Z, Zhang T, Wang X. Characteristics of Time-Dependent Selenium Biofortification of Rice ( Oryza sativa L.). J Agric Food Chem 2018; 66:12490-12497. [PMID: 30403867 DOI: 10.1021/acs.jafc.8b04502] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The application of selenite to soil has increasingly been used to produce Se-enriched food. This study investigated the biofortification characteristics of Se in rice after application of selenite to soil at different growth stages. The results showed that the application of Se during booting stage resulted in the highest concentration of Se in brown rice due to the highest upward translocation of Se. More than 90% of Se in the brown rice was organic species, with selenomethionine predominated. The proportion of selenomethionine in the brown rice decreased with the delay in application time. The rice grown in the acidic soil had higher Se concentrations than in the neutral soil. With increasing soil Cd level, Se accumulation and the proportion of Se-methylselenocysteine in the brown rice were reduced. This study provides a theoretical basis for the production of Se-enriched rice in clean soil or slightly to moderately Cd-contaminated soil.
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Affiliation(s)
- Gaoxiang Huang
- CAS Key Laboratory of Soil Environment and Pollution Remediation , Institute of Soil Science, Chinese Academy of Sciences , Nanjing 210008 , China
- University of Chinese Academy of Sciences , Beijing 100049 , China
| | - Changfeng Ding
- CAS Key Laboratory of Soil Environment and Pollution Remediation , Institute of Soil Science, Chinese Academy of Sciences , Nanjing 210008 , China
| | - Xiangyang Yu
- Institute of Food Quality and Safety , Jiangsu Academy of Agricultural Sciences , Nanjing 210014 , China
| | - Zhen Yang
- CAS Key Laboratory of Soil Environment and Pollution Remediation , Institute of Soil Science, Chinese Academy of Sciences , Nanjing 210008 , China
- College of Life Sciences , Nanjing Normal University , Nanjing , Jiangsu 210046 , China
| | - Taolin Zhang
- CAS Key Laboratory of Soil Environment and Pollution Remediation , Institute of Soil Science, Chinese Academy of Sciences , Nanjing 210008 , China
| | - Xingxiang Wang
- CAS Key Laboratory of Soil Environment and Pollution Remediation , Institute of Soil Science, Chinese Academy of Sciences , Nanjing 210008 , China
- Ecological Experimental Station of Red Soil , Chinese Academy of Sciences , Yingtan 335211 , China
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14
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Chi H, Yang L, Yang W, Li Y, Chen Z, Huang L, Chao Y, Qiu R, Wang S. Variation of the Bacterial Community in the Rhizoplane Iron Plaque of the Wetland Plant Typha latifolia. Int J Environ Res Public Health 2018; 15:E2610. [PMID: 30469475 PMCID: PMC6313532 DOI: 10.3390/ijerph15122610] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 11/15/2018] [Accepted: 11/16/2018] [Indexed: 12/02/2022]
Abstract
The survival of wetland plants in iron, sulfur and heavy metals-rich mine tailing ponds has been commonly attributed to the iron plaque (IP) on the root surface that acts as a protective barrier. However, the contribution of bacteria potentially regulates the iron-sulfur cycle and heavy metal exclusion at the root surface has not been studied in depth, particularly from a microbial ecology perspective. In this study, a pot experiment using Typha latifolia, a typical wetland plant, in non-polluted soil (NP) and tailing soil (T) was conducted. Samples from four zones, comprising non-rhizosphere soil (NR), rhizosphere soil (R) and internal (I) and external (E) layers of iron plaque, were collected from the NP and T and analyzed by 16S rRNA sequencing. Simpson index of the genus level showed greater diversities of bacterial community in the NP and its I zone is the most important part of the rhizosphere. PICRUSt predicted that the I zones in both NP and T harbored most of the functional genes. Specifically, functional genes related to sulfur relay and metabolism occurred more in the I zone in the T, whereas those related to iron acquisition and carbon and nitrogen circulation occurred more in the I zone in the NP. Analysis of dominant bacterial communities at genus level showed highest abundance of heavy metal resistant genus Burkholderia in the E zones in both soils, indicating that heavy metal resistance of Typha latifolia driven by Burkholderia mainly occurred at the external layer of IP. Moreover, many bacterial genera, such as Acidithiobacillus, Ferritrophicum, Thiomonas, Metallibacterium and Sideroxydans, involved in iron and sulfur metabolisms were found in the T and most showed higher abundance in the I zone than in the other zones. This work, as the first endeavor to separate the iron plaque into external and internal layers and investigate the variations of the bacterial communities therein, can provide an insight for further understanding the survival strategy of wetland plants, e.g., Typha latifolia, in extreme environment.
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Affiliation(s)
- Haochun Chi
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
| | - Lu Yang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
| | - Wenjing Yang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
| | - Yuanyuan Li
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
| | - Ziwu Chen
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
| | - Lige Huang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
| | - Yuanqing Chao
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
- Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China.
- Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Guangzhou 510275, China.
| | - Rongliang Qiu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
- Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China.
- Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Guangzhou 510275, China.
| | - Shizhong Wang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
- Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China.
- Guangdong Provincial Engineering Research Center for Heavy Metal Contaminated Soil Remediation, Guangzhou 510275, China.
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15
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Shen XX, Li RL, Chai MW, Qiu GY. [Characteristics of Iron Plaque and Its Heavy Metal Enrichment in Typical Mangrove Plants in Shenzhen Bay, China]. Huan Jing Ke Xue 2018; 39:1851-1860. [PMID: 29965012 DOI: 10.13227/j.hjkx.201708088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Based on the five typical mangrove species in the mangrove wetland of Shenzhen Bay, the contents and distributional characteristics of iron plaques (Fe) and the Mn, Pb, Zn, Cu, As, Cr, Cd, Ni, Co, and Sb enrichment of the iron plaques on mangrove plant roots were investigated. The results show that:① There is a significant difference in the contents of iron plaques among the five mangrove species, and the contents in the species follow the order:Acanthus ilicifolius > Aeagiceras corniculatum > Bruguiera gymnorrhiza > Kandelia obovate > Heritiera littorlis; the content ranged from 0.37 g·kg-1 to 10.81 g·kg-1. ② Iron plaques have a certain enrichment effect on the heavy metals in the sediments. The contents of heavy metals in the iron plaques vary with the plant species, being the highest in A. ilicifolius and the lowest in H. littorlis. This enrichment also varies with the element species:Mn content changed from 0.11 g·kg-1 to 2.67 g·kg-1; the highest contents of Pb, Zn, Cu, As, and Cr changed from 117.44 mg·kg-1 to 189.69 mg·kg-1; and the highest contents of Cd, Ni, Co. and Sb changed from 34.84 mg·kg-1 to 63.34 mg·kg-1. The content of Zn in the iron plaque is negatively correlated with the other heavy metal contents (P<0.001), indicating that Zn might compete with the other elements. ③ Sediment pH significantly affects the content of iron plaque and the accumulation of Mn in the iron plaque (P<0.05). The water content and salinity of the sediments are positively correlated with the contents of heavy metals Cr and Co in the iron plaque (P<0.05). ④ The distribution of iron plaques and their heavy metal contents in different parts of the roots of the mangrove plants follow the order:root tip > root middle > root base.
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Affiliation(s)
- Xiao-Xue Shen
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Rui-Li Li
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Min-Wei Chai
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Guo-Yu Qiu
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, China
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16
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Awasthi S, Chauhan R, Srivastava S, Tripathi RD. The Journey of Arsenic from Soil to Grain in Rice. Front Plant Sci 2017; 8:1007. [PMID: 28676805 PMCID: PMC5476935 DOI: 10.3389/fpls.2017.01007] [Citation(s) in RCA: 123] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 05/26/2017] [Indexed: 05/04/2023]
Abstract
Arsenic (As) is a non-essential toxic metalloid whose elevated concentration in rice grains is a serious issue both for rice yield and quality, and for human health. The rice-As interactions, hence, have been studied extensively in past few decades. A deep understanding of factors influencing As uptake and transport from soil to grains can be helpful to tackle this issue so as to minimize grain As levels. As uptake at the root surface by rice plants depends on factors like iron plaque and radial oxygen loss. There is involvement of a number of transporters viz., phosphate transporters and aquaglyceroporins in the uptake and transport of different As species and in the movement to subcellular compartments. These processes are also affected by sulfur availability and consequently on the level of thiol (-SH)-containing As binding peptides viz., glutathione (GSH) and phytochelatins (PCs). Further, the role of phloem in As movement to the grains is also suggested. This review presents a detailed map of journey of As from soil to the grains. The implications for the utilization of available knowledge in minimizing As in rice grains are presented.
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Affiliation(s)
- Surabhi Awasthi
- CSIR-National Botanical Research Institute, Council of Scientific and Industrial ResearchLucknow, India
| | - Reshu Chauhan
- CSIR-National Botanical Research Institute, Council of Scientific and Industrial ResearchLucknow, India
| | - Sudhakar Srivastava
- Institute of Environment and Sustanaible Development, Banaras Hindu UniversityVaranasi, India
| | - Rudra D. Tripathi
- CSIR-National Botanical Research Institute, Council of Scientific and Industrial ResearchLucknow, India
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17
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Shen YT, Song YF. Effects of organic ligands on Pb absorption and speciation changes in Arabidopsis as determined by micro X-ray fluorescence and X-ray absorption near-edge structure analysis. J Synchrotron Radiat 2017; 24:463-468. [PMID: 28244441 DOI: 10.1107/s1600577517001941] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Accepted: 02/06/2017] [Indexed: 06/06/2023]
Abstract
Pb can pass through the food chain via plants and threaten human health, which has attracted widespread attention. Changes in Pb speciation affect its bioavailability in soils and water. However, whether organic ligands can change the uptake and mobility of Pb in plants and increase or decrease Pb bioavailability remains uncertain. To reveal the roles of organic and inorganic Pb in Pb metabolism in plants, the localization and speciation changes of Pb in Arabidopsis thaliana plants grown in organic and inorganic Pb were characterized by synchrotron radiation micro X-ray fluorescence and X-ray absorption near-edge structure, respectively. These results demonstrated that Arabidopsis absorbed more Pb from Pb(NO3)2 than Pb(CH3COO)2 at the same exposure concentration. A higher percentage of Pb-citrate was found in Arabidopsis exposed to inorganic Pb solution, which suggested that Pb-citrate was the main complex for root-to-shoot transportation in Arabidopsis exposed to inorganic Pb solutions. Pb complexed with the organic ligand CH3COO- significantly inhibited primary root growth and lateral root development, while, at the same time, Pb was blocked by root hairs, which represented another way to reduce Pb absorption and protect the plant from biotoxicity.
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Affiliation(s)
- Ya Ting Shen
- National Research Center of Geoanalysis, 26# Xicheng District, Beijing 100037, People's Republic of China
| | - Yu Fang Song
- National Research Center of Geoanalysis, 26# Xicheng District, Beijing 100037, People's Republic of China
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18
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Sebastian A, Prasad MNV. Iron plaque decreases cadmium accumulation in Oryza sativa L. and serves as a source of iron. Plant Biol (Stuttg) 2016; 18:1008-1015. [PMID: 27439383 DOI: 10.1111/plb.12484] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Accepted: 07/15/2016] [Indexed: 06/06/2023]
Abstract
Cadmium (Cd) contamination occurs in paddy soils; hence it is necessary to reduce Cd content of rice. Application and mode of action of ferrous sulphate in minimizing Cd in rice was monitored in the present study. Pot culture with Indian rice variety Swarna (MTU 7029) was maintained in Cd-spiked soil containing ferrous sulphates, which is expected to reduce Cd accumulation in rice. Responses in rhizosphere pH, root surface, metal accumulation in plant and molecular physiological processes were monitored. Iron plaque was induced on root surfaces after FeSO4 application and the amount of Fe in plaque reduced with increases in Cd in the soil. Rhizosphere pH decreased during plaque formation and became more acidic due to secretion of organic acids from the roots under Cd treatment. Moreover, iron chelate reductase activity increased with Cd treatment, but in the absence of Cd, activity of this enzyme increased in plaque-induced plants. Cd treatment caused expression of OsYSL18, whereas OsYSL15 was expressed only in roots without iron plaque. Fe content of plants increased during plaque formation, which protected plants from Cd-induced Fe deficiency and metal toxicity. This was corroborated with increased biomass, chlorophyll content and quantum efficiency of photo-synthesis among plaque-induced plants. We conclude that ferrous sulphate-induced iron plaque prevents Cd accumulation and Fe deficiency in rice. Iron released from plaque via organic acid mediated dissolution during Cd stress.
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Affiliation(s)
- A Sebastian
- Department of Plant Sciences, University of Hyderabad, Hyderabad, India
| | - M N V Prasad
- Department of Plant Sciences, University of Hyderabad, Hyderabad, India.
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19
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Yang JX, Guo QJ, Yang J, Zhou XY, Ren HY, Zhang HZ, Xu RX, Wang XD, Peters M, Zhu GX, Wei RF, Tian LY, Han XK. Red mud (RM)-Induced enhancement of iron plaque formation reduces arsenic and metal accumulation in two wetland plant species. Int J Phytoremediation 2016; 18:269-277. [PMID: 26505322 DOI: 10.1080/15226514.2015.1085830] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Human activities have resulted in arsenic (As) and heavy metals accumulation in paddy soils in China. Phytoremediation has been suggested as an effective and low-cost method to clean up contaminated soils. A combined soil-sand pot experiment was conducted to investigate the influence of red mud (RM) supply on iron plaque formation and As and heavy metal accumulation in two wetland plant species (Cyperus alternifolius Rottb., Echinodorus amazonicus Rataj), using As and heavy metals polluted paddy soil combined with three rates of RM application (0, 2%, 5%). The results showed that RM supply significantly decreased As and heavy metals accumulation in shoots of the two plants due to the decrease of As and heavy metal availability and the enhancement of the formation of iron plaque on the root surface and in the rhizosphere. Both wetland plants supplied with RM tended to have more Fe plaque, higher As and heavy metals on roots and in their rhizospheres, and were more tolerant of As and heavy metal toxicity. The results suggest that RM-induced enhancement of the formation of iron plaque on the root surface and in the rhizosphere of wetland plants may be significant for remediation of soils contaminated with As and heavy metals.
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Affiliation(s)
- J X Yang
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
| | - Q J Guo
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
| | - J Yang
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
| | - X Y Zhou
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
| | - H Y Ren
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
| | - H Z Zhang
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
- b University of Chinese Academy of Sciences , Beijing , P. R. China
| | - R X Xu
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
| | - X D Wang
- c College of Resource Environment and Tourism , Capital Normal University , Beijing , P. R. China
| | - M Peters
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
| | - G X Zhu
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
- b University of Chinese Academy of Sciences , Beijing , P. R. China
| | - R F Wei
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
- b University of Chinese Academy of Sciences , Beijing , P. R. China
| | - L Y Tian
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
- b University of Chinese Academy of Sciences , Beijing , P. R. China
| | - X K Han
- a Center for Environmental Remediation, Institute of Geographical Sciences and Natural Resources Research , Chinese Academy of Sciences , Beijing , P. R. China
- b University of Chinese Academy of Sciences , Beijing , P. R. China
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20
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Qian Y, Feng H, Gallagher FJ, Zhu Q, Wu M, Liu CJ, Jones KW, Tappero RV. Synchrotron study of metal localization in Typha latifolia L. root sections. J Synchrotron Radiat 2015; 22:1459-1468. [PMID: 26524311 DOI: 10.1107/s1600577515017269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2015] [Accepted: 09/15/2015] [Indexed: 06/05/2023]
Abstract
Understanding mechanisms that control plant root metal assimilation in soil is critical to the sustainable management of metal-contaminated land. With the assistance of the synchrotron X-ray fluorescence technique, this study investigated possible mechanisms that control the localization of Fe, Cu, Mn, Pb and Zn in the root tissues of Typha latifolia L. collected from a contaminated wetland. Metal localizations especially in the case of Fe and Pb in the dermal tissue and the vascular bundles were different. Cluster analysis was performed to divide the dermal tissue into iron-plaque-enriched dermal tissue and regular dermal tissue based on the spatial distribution of Pb and Fe. Factor analysis showed that Cu and Zn were closely correlated to each other in the dermal tissues. The association of Cu, Zn and Mn with Fe was strong in both regular dermal tissue and iron-plaque-enriched dermal tissue, while significant (p < 0.05) correlation of Fe with Pb was only observed in tissues enriched with iron plaque. In the vascular bundles, Zn, Mn and Cu showed strong association, suggesting that the localization of these three elements was controlled by a similar mechanism. Iron plaque in the peripheral dermal tissues acted as a barrier for Pb and a buffer for Zn, Cu and Mn. The Casparian strip regulated the transportation of metals from dermal tissues to the vascular bundles. The results suggested that the mechanisms controlling metal localization in root tissues varied with both tissue types and metals.
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Affiliation(s)
- Yu Qian
- Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ 07043, USA
| | - Huan Feng
- Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ 07043, USA
| | - Frank J Gallagher
- Environmental Planning and Design Program, Department of Landscape Architecture, Rutgers, The State University of New Jersey, New Brunswick, NJ 08901, USA
| | - Qingzhi Zhu
- School of Marine and Atmospheric Science, State University of New York, Stony Brook, NY 11794, USA
| | - Meiyin Wu
- Department of Biology and Molecular Biology, Montclair State University, Montclair, NJ 07043, USA
| | - Chang Jun Liu
- Biosciences Department, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Keith W Jones
- Photon Sciences Directorate, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Ryan V Tappero
- Photon Sciences Directorate, Brookhaven National Laboratory, Upton, NY 11973, USA
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Pan W, Wu C, Xue S, Hartley W. Arsenic dynamics in the rhizosphere and its sequestration on rice roots as affected by root oxidation. J Environ Sci (China) 2014; 26:892-9. [PMID: 25079420 DOI: 10.1016/s1001-0742(13)60483-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2013] [Revised: 07/23/2013] [Accepted: 10/23/2013] [Indexed: 05/24/2023]
Abstract
A pot experiment was conducted to investigate the effects of root oxidation on arsenic (As) dynamics in the rhizosphere and As sequestration on rice roots. There were significant differences (P < 0.05) in pH values between rhizosphere and non-rhizosphere soils, with pH 5.68-6.16 in the rhizosphere and 6.30-6.37 in non-rhizosphere soils as well as differences in redox potentials (P < 0.05). Percentage arsenite was lower (4%-16%) in rhizosphere soil solutions from rice genotypes with higher radial oxygen loss (ROL) compared with genotypes with lower ROL (P < 0.05). Arsenic concentrations in iron plaque and rice straw were significantly negatively correlated (R = -0.60, P < 0.05). Genotypes with higher ROL (TD71 and Yinjingruanzhan) had significantly (P < 0.001) lower total As in rice grains (1.35 and 0.96 mg/kg, respectively) compared with genotypes with lower ROL (IAPAR9, 1.68 mg/kg; Nanyangzhan 2.24 mg/kg) in the As treatment, as well as lower inorganic As (P < 0.05). The present study showed that genotypes with higher ROL could oxidize more arsenite in rhizosphere soils, and induce more Fe plaque formation, which subsequently sequestered more As. This reduced As uptake in aboveground plant tissues and also reduced inorganic As accumulation in rice grains. The study has contributed to further understanding the mechanisms whereby ROL influences As uptake and accumulation in rice.
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Affiliation(s)
- Weisong Pan
- Institute of Environmental Engineering, School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China; College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China.
| | - Chuan Wu
- Institute of Environmental Engineering, School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China.
| | - Shengguo Xue
- Institute of Environmental Engineering, School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China
| | - William Hartley
- Crop and Environment Sciences Department, Harper Adams University, Newport, Shropshire, TF10 8NB, United Kingdom
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Wu C, Ye Z, Li H, Wu S, Deng D, Zhu Y, Wong M. Do radial oxygen loss and external aeration affect iron plaque formation and arsenic accumulation and speciation in rice? J Exp Bot 2012; 63:2961-70. [PMID: 22345639 PMCID: PMC3350917 DOI: 10.1093/jxb/ers017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Revised: 11/24/2011] [Accepted: 01/08/2012] [Indexed: 05/02/2023]
Abstract
Hydroponic experiments were conducted to investigate the effect of radial oxygen loss (ROL) and external aeration on iron (Fe) plaque formation, and arsenic (As) accumulation and speciation in rice (Oryza sativa L.). The data showed that there were significant correlations between ROL and Fe concentrations in Fe plaque produced on different genotypes of rice. There were also significant differences in the amounts of Fe plaque formed between different genotypes in different positions of roots and under different aeration conditions (aerated, normal, and stagnant treatments). In aerated treatments, rice tended to have a higher Fe plaque formation than in a stagnant solution, with the greatest formation at the root tip decreasing with increasing distances away, in accordance with a trend of spatial ROL. Genotypes with higher rates of ROL induced higher degrees of Fe plaque formation. Plaques sequestered As on rice roots, with arsenate almost double that with arsenite, leading to decreased As accumulation in both roots and shoots. The major As species detected in roots and shoots was arsenite, ranging from 34 to 78% of the total As in the different treatments and genotypes. These results contribute to our understanding of genotypic differences in As uptake by rice and the mechanisms causing rice genotypes with higher ROL to show lower overall As accumulation.
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Affiliation(s)
- Chuan Wu
- Croucher Institute for Environmental Sciences, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, PR China
- School of Environmental and Resource Sciences, Zhejiang Agriculture and Forestry University, Linan 311300, PR China
| | - Zhihong Ye
- State Key Laboratory for Bio-control, and School of Life Sciences, Sun Yat-sen University, Guangzhou 510006, PR China
| | - Hui Li
- Croucher Institute for Environmental Sciences, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, PR China
- School of Environmental and Resource Sciences, Zhejiang Agriculture and Forestry University, Linan 311300, PR China
| | - Shengchun Wu
- Croucher Institute for Environmental Sciences, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, PR China
- School of Environmental and Resource Sciences, Zhejiang Agriculture and Forestry University, Linan 311300, PR China
| | - Dan Deng
- Croucher Institute for Environmental Sciences, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, PR China
- School of Environmental and Resource Sciences, Zhejiang Agriculture and Forestry University, Linan 311300, PR China
| | - Yongguan Zhu
- Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Haidian, Beijing 100085, PR China
- Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Science, Xiamen 361021, PR China
| | - Minghung Wong
- Croucher Institute for Environmental Sciences, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, PR China
- School of Environmental and Resource Sciences, Zhejiang Agriculture and Forestry University, Linan 311300, PR China
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23
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Garnier JM, Travassac F, Lenoble V, Rose J, Zheng Y, Hossain MS, Chowdhury SH, Biswas AK, Ahmed KM, Cheng Z, van Geen A. Temporal variations in arsenic uptake by rice plants in Bangladesh: the role of iron plaque in paddy fields irrigated with groundwater. Sci Total Environ 2010; 408:4185-93. [PMID: 20576285 PMCID: PMC2908012 DOI: 10.1016/j.scitotenv.2010.05.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2009] [Revised: 05/02/2010] [Accepted: 05/14/2010] [Indexed: 05/13/2023]
Abstract
The transfer of arsenic to rice grains is a human health issue of growing relevance in regions of southern Asia where shallow groundwater used for irrigation of paddy fields is elevated in As. In the present study, As and Fe concentrations in soil water and in the roots of rice plants, primarily the Fe plaque surrounding the roots, were monitored during the 4-month growing season at two sites irrigated with groundwater containing approximately 130microgl(-1) As and two control sites irrigated with water containing <15microgl(-1) As. At both sites irrigated with contaminated water, As concentrations in soil water increased from <10microgl(-1) to >1000microgl(-1) during the first five weeks of the growth season and then gradually declined to <10microgl(-1) during the last five weeks. At the two control sites, concentrations of As in soil water never exceeded 40microgl(-1). At both contaminated sites, the As content of roots and Fe plaque rose to 1000-1500mgkg(-1) towards the middle of the growth season. It then declined to approximately 300mgkg(-1) towards the end, a level still well above As concentration of approximately 100mgkg(-1) in roots and plaque measured throughout the growing season at the two control sites. These time series, combined with simple mass balance considerations, demonstrate that the formation of Fe plaque on the roots of rice plants by micro-aeration significantly limits the uptake of As by rice plants grown in paddy fields. Large variations in the As and Fe content of plant stems at two of the sites irrigated with contaminated water and one of the control sites were also recorded. The origin of these variations, particularly during the last month of the growth season, needs to be better understood because they are likely to influence the uptake of As in rice grains.
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Affiliation(s)
- J-M Garnier
- Centre Européen de Recherche et d'Enseignement de Géosciences de l'Environnement UMR 6635 CNRS-Aix-Marseille Université, FR ECCOREV, Europôle Méditerranéen de l'Arbois, 13545 Aix-en-Provence, France.
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Batty LC, Younger PL. Effects of external iron concentration upon seedling growth and uptake of Fe and phosphate by the common reed, Phragmites australis (Cav.) Trin ex. Steudel. Ann Bot 2003; 92:801-6. [PMID: 14565939 PMCID: PMC4243622 DOI: 10.1093/aob/mcg205] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
The objectives of this study were to determine whether, and to what degree, the aqueous iron concentration in the growing medium affects the growth of, and Fe uptake by, Phragmites australis, and whether the presence of iron in the growing environment affects the uptake of the essential element phosphate. The wetland macrophyte P. australis was grown under laboratory conditions in nutrient solution (0.31 mg L(-1) phosphate) containing a range of iron concentrations (0-50 mg L(-1) Fe). A threshold of iron concentration (1 mg L(-1)) was found, above which growth of P. australis was significantly inhibited. No direct causal relationship between iron content in aerial tissues and growth inhibition was found, which strongly suggests that iron toxicity cannot explain these results. Phosphate concentrations in aerial tissues were consistently sufficient for growth and development (2-3 % d. wt) despite significant variation in concentration of phosphate associated with roots. External Fe concentration had a significant effect on the growth of P. australis and on both Fe and phosphate concentrations associated with roots. However, neither direct toxicity nor phosphate deficiency could explain the reduction in growth above 1 mg L(-1) external Fe concentration
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Affiliation(s)
- L C Batty
- School of Civil Engineering and Geosciences, University of Newcastle, Newcastle upon Tyne NE1 7RU, UK.
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25
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Ye ZH, Baker AJM, Wong MH, Willis AJ. Copper and nickel uptake, accumulation and tolerance in Typha latifolia with and without iron plaque on the root surface. New Phytol 1997; 136:481-488. [PMID: 33863014 DOI: 10.1046/j.1469-8137.1997.00758.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The effects of iron plaque on the growth of Typha latifolia L. and accumulation of copper and nickel in T. latifolia were investigated under laboratory conditions in nutrient solution cultures. Seedlings with and without iron plaque on their roots were exposed to 0.05 μg ml-1 Cu and 0.10 μg ml-1 Ni solutions for 72 d. The results showed no differences in root and shoot d. wt and leaf elongation when Cu or Ni were added to the solution and in the presence or absence of plaque. However, root length was reduced by Cu and Ni, and the reduction in root length was greater in the presence of plaque. Some Cu and Ni was adsorbed on root surfaces; roots with plaque took up more Cu, but less Ni than those without. The presence of plaque did not alter Cu uptake and translocation but increased Ni uptake and translocation. Most of the Cu and Ni taken up was retained in the roots, suggesting that the root tissue rather than the root surface or plaque is the main barrier for Cu and Ni transport. The results differ from those reported for other species.
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Affiliation(s)
- Z H Ye
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S. Yorks, S10 2TN, UK
| | - A J M Baker
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S. Yorks, S10 2TN, UK
| | - M H Wong
- Department of Biology, Hong Kong Baptist University, 224 Waterloo Rd, Kowloon Tong, Hong Kong
| | - A J Willis
- Department of Animal and Plant Sciences, University of Sheffield, Sheffield, S. Yorks, S10 2TN, UK
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Abstract
The iron plaque on roots of Aster tripolium L. growing in waterlogged salt marsh soil adsorbed appreciable amounts of Zn and Cu, with maximum Zn/Fe and Cu/Fe ratios of 0.1 When concentrations of Zn or Cu adsorbed in the iron plaque are expressed as mg metal kg-1 FeOOH (assuming that iron plaque consists mainly of FeOOH), the Zn and Cu concentrations of the iron plaque was up to 680 and up to 2000 times higher than in the surrounding sediment, respectively. The Zn concentration in red roots (with iron plaque) was higher than in white roots (without iron plaque). Zn concentrations in field sampled roots were correlated with the amount of Zn on the roots and the Zn concentration in the soil, whereas Cu concentrations in the roots were only significantly correlated to the Cu concentration in the soil. In vitro experiments showed that red roots take up more Zn than white roots. Measurement of Zn uptake by excised roots showed that the uptake of Zn into the xylem fluid was significantly higher in roots with 500-2000 nmol Fe cm-2 on the root surface compared to roots with less than 500 or more than 2000 nmol Fe cm-2 on the root surface. The results indicate that iron plaque enhances uptake of Zn by the roots but may act as a barrier when large amounts of Fe are deposited on the root surface. The role of the iron plaque on roots of salt marsh plants growing in soil contaminated with heavy metals is discussed.
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Affiliation(s)
- M L Otte
- Department of Plant Ecology and Ecotoxicology, Biological Laboratory, Free University, P.O. Box 7161 1007 MC Amsterdam, The Netherlands
| | - J Rozema
- Department of Plant Ecology and Ecotoxicology, Biological Laboratory, Free University, P.O. Box 7161 1007 MC Amsterdam, The Netherlands
| | - L Koster
- Department of Plant Ecology and Ecotoxicology, Biological Laboratory, Free University, P.O. Box 7161 1007 MC Amsterdam, The Netherlands
| | - M S Haarsma
- Department of Plant Ecology and Ecotoxicology, Biological Laboratory, Free University, P.O. Box 7161 1007 MC Amsterdam, The Netherlands
| | - R A Broekman
- Department of Plant Ecology and Ecotoxicology, Biological Laboratory, Free University, P.O. Box 7161 1007 MC Amsterdam, The Netherlands
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