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Wang M, Chen X, Hamid Y, Yang X. Evaluating the Response of the Soil Bacterial Community and Lettuce Growth in a Fluorine and Cadmium Co-Contaminated Yellow Soil. TOXICS 2024; 12:459. [PMID: 39058111 PMCID: PMC11280846 DOI: 10.3390/toxics12070459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2024] [Revised: 06/21/2024] [Accepted: 06/22/2024] [Indexed: 07/28/2024]
Abstract
The impact of cadmium (Cd) and fluorine (F) on plant and human health has provoked significant public concern; however, their combined effects on plant and soil bacterial communities have yet to be determined. Here, a pot experiment was conducted to evaluate the effects of exogenous F, Cd, and their combination (FCd) on lettuce growth and soil bacterial communities. The results revealed that F and Cd concentrations in lettuce ranged from 63.69 to 219.45 mg kg-1 and 1.85 to 33.08 mg kg-1, respectively, presenting lower values in shoots than in the roots. Moreover, low contamination levels had no discernable influence on lettuce growth, but showed a synergistic negative on plant biomass when exogenous F and Cd exceeds 300 and 1.0 mg kg-1, respectively. The results of 16S rRNA gene sequencing indicated that the most abundant bacterial community at the phylum level was Proteobacteria, with the relative abundance ranging from 33.42% to 44.10% across all the treatments. The contaminants had little effect on bacterial richness but impacted the structure of bacterial communities. The PCoA showed that compartment and contaminants were the primary contributors to the largest source of community variation, while the VPA indicated that F and Cd synergistically affected the bacterial communities. In turn, lettuce plants could enhance the resistance to the combined stress by increasing the relative abundance of Oxyphotobacteria, Subgroup 6, Thermoleophilia, and TK10 classes in the rhizosphere.
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Affiliation(s)
- Mei Wang
- School of China Alcoholic Drinks, Luzhou Vocational and Technical College, Luzhou 646000, China
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xiangxiang Chen
- School of China Alcoholic Drinks, Luzhou Vocational and Technical College, Luzhou 646000, China
| | - Yasir Hamid
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xiaoe Yang
- Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China
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2
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Tausta SL, Fontaine K, Hillmer AT, Strobel SA. Fluoride transport in Arabidopsis thaliana plants is impaired in Fluoride EXporter (FEX) mutants. PLANT MOLECULAR BIOLOGY 2024; 114:17. [PMID: 38342783 PMCID: PMC10859346 DOI: 10.1007/s11103-023-01413-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 12/20/2023] [Indexed: 02/13/2024]
Abstract
Fluoride is an environmental toxin prevalent in water, soil, and air. A fluoride transporter called Fluoride EXporter (FEX) has been discovered across all domains of life, including bacteria, single cell eukaryotes, and all plants, that is required for fluoride tolerance. How FEX functions to protect multicellular plants is unknown. In order to distinguish between different models, the dynamic movement of fluoride in wildtype (WT) and fex mutant plants was monitored using [18F]fluoride with positron emission tomography. Significant differences were observed in the washout behavior following initial fluoride uptake between plants with and without a functioning FEX. [18F]Fluoride traveled quickly up the floral stem and into terminal tissues in WT plants. In contrast, the fluoride did not move out of the lower regions of the stem in mutant plants resulting in clearance rates near zero. The roots were not the primary locus of FEX action, nor did FEX direct fluoride to a specific tissue. Fluoride efflux by WT plants was saturated at high fluoride concentrations resulting in a pattern like the fex mutant. The kinetics of fluoride movement suggested that FEX mediates a fluoride transport mechanism throughout the plant where each individual cell benefits from FEX expression.
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Affiliation(s)
- S Lori Tausta
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06510, USA
- Institute of Biomolecular Design and Discovery, Yale University West Campus, West Haven, CT, 06516, USA
| | - Kathryn Fontaine
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, 330 Cedar Street, New Haven, CT, 06519, USA
- Yale PET Center, Yale University, 801 Howard Avenue, New Haven, CT, 06510, USA
| | - Ansel T Hillmer
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, 330 Cedar Street, New Haven, CT, 06519, USA
- Yale PET Center, Yale University, 801 Howard Avenue, New Haven, CT, 06510, USA
- Department of Biomedical Engineering, Yale University, 17 Hillhouse Avenue, New Haven, CT, 06511, USA
- Department of Psychiatry, Yale School of Medicine, 300 George Street, New Haven, CT, 06510, USA
| | - Scott A Strobel
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT, 06510, USA.
- Institute of Biomolecular Design and Discovery, Yale University West Campus, West Haven, CT, 06516, USA.
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Wang M, Wang H, Lei G, Yang B, Hu T, Ye Y, Li W, Zhou Y, Yang X, Xu H. Current progress on fluoride occurrence in the soil environment: Sources, transformation, regulations and remediation. CHEMOSPHERE 2023; 341:139901. [PMID: 37659515 DOI: 10.1016/j.chemosphere.2023.139901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 08/03/2023] [Accepted: 08/19/2023] [Indexed: 09/04/2023]
Abstract
Fluorine is a halogen element widely distributed in nature, but due to excessive emissions from industrial manufacturing and agricultural production, etc., the soil is over-enriched with fluoride and the normal growth of plants is under stress, and it also poses a great threat to human health. In this review, we summarized the sources of fluoride in soil, and then analyzed the potential mechanisms of fluoride uptake in soil-plant systems. In addition, the main influences of soil ecosystems on plant fluoride uptake were discussed, soil management options to mitigate fluoride accumulation in plants were also summarized. The bioremediation techniques were found to be a developmental direction to improve fluoride pollution. Finally, we proposed other research directions, including fluoride uptake mechanisms in soil-plant systems at the molecular expression levels, development of visualization techniques for fluoride transport in plants, interactions mechanisms between soil microhabitats and plant metabolism affecting fluoride uptake, as well as combining abiotic additives, nanotechnology and biotechnology to remediate fluoride contamination problems.
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Affiliation(s)
- Minghan Wang
- College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
| | - Haoyang Wang
- College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
| | - Ge Lei
- College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
| | - Biao Yang
- College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
| | - Teng Hu
- College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
| | - Yingying Ye
- College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
| | - Wei Li
- School of Biology and Chemistry, Key Laboratory of Chemical Synthesis and Environmental Pollution Control-Remediation Technology of Guizhou Province, Minzu Normal University of Xingyi, Xingyi 562400, China.
| | - Yaoyu Zhou
- College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China
| | - Xiao Yang
- Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Huaqin Xu
- College of Environment and Ecology, Hunan Agricultural University, Changsha 410128, China.
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Almeida Rodrigues A, Almeida Rodrigues D, de Fátima Sales J, Carvalho Vasconcelos Filho S, Carlos Costa A, Lino Rodrigues C, Alves da Silva A, Domingos M, Müller C. Morphoanatomical, Physiological, and Biochemical Indicators in Lactuca sativa L. Germination and Growth in Response to Fluoride. PLANTS (BASEL, SWITZERLAND) 2022; 11:3406. [PMID: 36501445 PMCID: PMC9738690 DOI: 10.3390/plants11233406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 11/23/2022] [Accepted: 11/23/2022] [Indexed: 06/17/2023]
Abstract
Fluoride is one of the main phytotoxic environmental pollutants, and high concentrations (10-30 mg L-1) are commonly detected in surface and groundwater. Little, however, is known about the effects of this pollutant on crops that require irrigation during their development, which, in addition to phytotoxicity, may cause negative human health effects. Thus, the aim of this study was to characterize the effects of potassium fluoride (KF) on the germination of lettuce seeds and identify the physiological and anatomical markers of this pollutant's action on plants exposed to it during growth. Initially, lettuce seeds were sown in gerboxes and soaked in solutions containing 0 mg L-1, 10 mg L-1, 20 mg L-1, and 30 mg L-1 KF. Plants grown in a greenhouse were treated daily with KF irrigation at the same KF concentrations for 40 days. KF exposure reduced the germination rate and germination speed index of lettuce seeds at 20 mg L-1 and 30 mg L-1, resulting in compromised root development at the highest KF concentration. Lettuce plants displayed a slight photosynthesis reduction and a significant photochemical efficiency decrease after exposures to all KF concentrations. Lower chlorophyll contents and nitrogen balance indices were observed in plants exposed to 30 mg L-1 KF. On the other hand, increases in phenolic compounds and malondialdehyde were noted with increasing KF concentrations. Lettuce plants can, therefore, accumulate fluoride in leaves when irrigated with KF-rich water. The investigated physiological and biochemical variables were proven to be adequate fluoride action biomarkers in lettuce plants and may become an important tool in the study of olericulture contaminants.
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Affiliation(s)
- Arthur Almeida Rodrigues
- Laboratory of Seeds, Goiano Federal Institute of Education, Science and Technology (IFGoiano), Campus Rio Verde, P.O. Box 66, Rio Verde 75901-970, Brazil
- Laboratory of Plant Anatomy, Goiano Federal Institute of Education, Science and Technology (IFGoiano), Campus Rio Verde, P.O. Box 66, Rio Verde 75901-970, Brazil
| | - Douglas Almeida Rodrigues
- Laboratory of Seeds, Goiano Federal Institute of Education, Science and Technology (IFGoiano), Campus Rio Verde, P.O. Box 66, Rio Verde 75901-970, Brazil
- Laboratory of Plant Anatomy, Goiano Federal Institute of Education, Science and Technology (IFGoiano), Campus Rio Verde, P.O. Box 66, Rio Verde 75901-970, Brazil
| | - Juliana de Fátima Sales
- Laboratory of Seeds, Goiano Federal Institute of Education, Science and Technology (IFGoiano), Campus Rio Verde, P.O. Box 66, Rio Verde 75901-970, Brazil
| | - Sebastião Carvalho Vasconcelos Filho
- Laboratory of Plant Anatomy, Goiano Federal Institute of Education, Science and Technology (IFGoiano), Campus Rio Verde, P.O. Box 66, Rio Verde 75901-970, Brazil
| | - Alan Carlos Costa
- Laboratory of Ecophysiology and Plant Productivity, Goiano Federal Institute of Education, Science and Technology (IFGoiano), Campus Rio Verde, P.O. Box 66, Rio Verde 75901-970, Brazil
| | - Cássia Lino Rodrigues
- Laboratory of Seeds, Goiano Federal Institute of Education, Science and Technology (IFGoiano), Campus Rio Verde, P.O. Box 66, Rio Verde 75901-970, Brazil
| | - Adinan Alves da Silva
- Laboratory of Ecophysiology and Plant Productivity, Goiano Federal Institute of Education, Science and Technology (IFGoiano), Campus Rio Verde, P.O. Box 66, Rio Verde 75901-970, Brazil
| | - Marisa Domingos
- Instituto de Botânica, Núcleo de Pesquisa em Ecologia, Miguel Stéfano Ave. 3687, São Paulo 04045-972, Brazil
| | - Caroline Müller
- Laboratory of Ecophysiology and Plant Productivity, Goiano Federal Institute of Education, Science and Technology (IFGoiano), Campus Rio Verde, P.O. Box 66, Rio Verde 75901-970, Brazil
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Grünhofer P, Stöcker T, Guo Y, Li R, Lin J, Ranathunge K, Schoof H, Schreiber L. Populus × canescens root suberization in reaction to osmotic and salt stress is limited to the developing younger root tip region. PHYSIOLOGIA PLANTARUM 2022; 174:e13765. [PMID: 36281836 DOI: 10.1111/ppl.13765] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Revised: 08/05/2022] [Accepted: 08/12/2022] [Indexed: 06/16/2023]
Abstract
Populus is a valuable and fast-growing tree species commonly cultivated for economic and scientific purposes. But most of the poplar species are sensitive to drought and salt stress. Thus, we compared the physiological effects of osmotic stress (PEG8000) and salt treatment (NaCl) on poplar roots to identify potential strategies for future breeding or genetic engineering approaches. We investigated root anatomy using epifluorescence microscopy, changes in root suberin composition and amount using gas chromatography, transcriptional reprogramming using RNA sequencing, and modifications of root transport physiology using a pressure chamber. Poplar roots reacted to the imposed stress conditions, especially in the developing younger root tip region, with remarkable differences between both types of stress. Overall, the increase in suberin content was surprisingly small, but the expression of key suberin biosynthesis genes was strongly induced. Significant reductions of the radial water transport in roots were only observed for the osmotic and not the hydrostatic hydraulic conductivity. Our data indicate that the genetic enhancement of root suberization processes in poplar might be a promising target to convey increased tolerance, especially against toxic sodium chloride.
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Affiliation(s)
- Paul Grünhofer
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Bonn, Germany
| | - Tyll Stöcker
- Department of Crop Bioinformatics, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Yayu Guo
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Science and Technology, Beijing Forestry University, Beijing, China
- Institute of Tree Development and Genome Editing, Beijing Forestry University, Beijing, China
| | - Ruili Li
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Science and Technology, Beijing Forestry University, Beijing, China
- Institute of Tree Development and Genome Editing, Beijing Forestry University, Beijing, China
| | - Jinxing Lin
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Science and Technology, Beijing Forestry University, Beijing, China
- Institute of Tree Development and Genome Editing, Beijing Forestry University, Beijing, China
| | - Kosala Ranathunge
- UWA School of Biological Sciences, The University of Western Australia, Perth, Western Australia, Australia
| | - Heiko Schoof
- Department of Crop Bioinformatics, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Lukas Schreiber
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Bonn, Germany
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6
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Luo B, Guang M, Yun W, Ding S, Ren S, Gao H. Camellia sinensis Chloroplast Fluoride Efflux Gene CsABCB9 Is Involved in the Fluoride Tolerance Mechanism. Int J Mol Sci 2022; 23:ijms23147756. [PMID: 35887104 PMCID: PMC9317437 DOI: 10.3390/ijms23147756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 07/08/2022] [Accepted: 07/12/2022] [Indexed: 12/10/2022] Open
Abstract
Soil is a main source of fluoride for plants. The tea plants (Camellia sinensis) accumulate excessive amounts of fluoride in their leaves compared to other plants, but their fluoride tolerance mechanism is poorly understood. A chloroplast fluoride efflux gene (CsABCB9) was newly discovered by using transcriptome analysis, cloned from Camellia sinensis, and its function was demonstrated in the fluoride detoxication mechanism in Escherichia coli/Xenopus laevis oocytes and Arabidopsis thaliana. CsABCB9 is expressed in tea leaves upon F− treatment. The growth of tea, E. coli, and Arabidopsis were inhibited by F− treatment. However, growth of CsABCB9-overexpression in E. coli was shown to increase with lower fluoride content under F− treatment compared to the control. Furthermore, chlorophyll, xanthophyll and soluble sugar contents of CsABCB9-overexpression in Arabidopsis were improved under F− treatment compared to the wild type. CsABCB9 functions in fluoride transport, and the mechanism by which CsABCB9 improves fluoride resistance in tea is mainly chloroplast protection through fluoride efflux.
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Affiliation(s)
- Bingbing Luo
- Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention, Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China; (M.G.); (W.Y.); (S.D.); (S.R.)
- Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-Restoration, Ministry of Natural Resources, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
- Correspondence: (B.L.); (H.G.); Tel./Fax: +86-0551-65786447 (H.G.)
| | - Min Guang
- Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention, Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China; (M.G.); (W.Y.); (S.D.); (S.R.)
- Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-Restoration, Ministry of Natural Resources, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Wenjing Yun
- Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention, Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China; (M.G.); (W.Y.); (S.D.); (S.R.)
- Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-Restoration, Ministry of Natural Resources, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Shitao Ding
- Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention, Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China; (M.G.); (W.Y.); (S.D.); (S.R.)
- Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-Restoration, Ministry of Natural Resources, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Suna Ren
- Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention, Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China; (M.G.); (W.Y.); (S.D.); (S.R.)
- Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-Restoration, Ministry of Natural Resources, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
| | - Hongjian Gao
- Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention, Engineering and Technology Research Center of Intelligent Manufacture and Efficient Utilization of Green Phosphorus Fertilizer of Anhui Province, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China; (M.G.); (W.Y.); (S.D.); (S.R.)
- Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-Restoration, Ministry of Natural Resources, College of Resources and Environment, Anhui Agricultural University, Hefei 230036, China
- Correspondence: (B.L.); (H.G.); Tel./Fax: +86-0551-65786447 (H.G.)
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Gomes TF, Lima AM, Marques APP, da Silva LC. Effects of fluoride emission on the morphoanatomy of three plant species endemics to Brazil using passive biomonitoring. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:10.1007/s11356-021-13017-2. [PMID: 33638070 DOI: 10.1007/s11356-021-13017-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 02/15/2021] [Indexed: 06/12/2023]
Abstract
Fluoride is the most phytotoxic atmospheric pollutant. The objective of this study was to evaluate the effects of fluoride emissions by an aluminum smelter on three plant species endemics to Brazil, located at Parque Estadual do Itacolomi (PEI). The monitored species were Byrsonima variabilis (Malpighiaceae), Myrceugenia alpigena (Myrtaceae), and Eremanthus erythropappus (Asteraceae), which were monitored during 9 months using passive biomonitoring at five different locations with different distances from the smelter. The monitored species did not show macroscopic phytotoxicity damage to fluoride; however, they did show microscopic damage. The species closer to the smelter presented more severe anatomic damages, such as rupture of cell walls, protoplast retraction, and trichome alterations. Damaged stomatal ledges, flaking epicuticular wax, and damages to trichomes were observed. M. alpigena showed a higher accumulation of fluoride than the other species at all monitored sites. The test for cell death with Evans Blue was positive for the three studied species. Through biomonitoring in the PEI, we concluded that the emissions from the aluminum smelter affect the native vegetation and that due to the greater accumulation of fluoride and the diversity of microscopic damage in M. alpigena, the use of this species in the monitoring of environments polluted by fluoride is enhanced.
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Affiliation(s)
- Thamires Fernanda Gomes
- Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Campus Universitário, Vicosa, MG, 36570-900, Brazil
| | - Ademir Martins Lima
- Departamento de Agronomia, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Campus Universitário, Vicosa, MG, 36570-900, Brazil
| | - Ana Paula Pires Marques
- Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Campus Universitário, Vicosa, MG, 36570-900, Brazil
| | - Luzimar Campos da Silva
- Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Campus Universitário, Vicosa, MG, 36570-900, Brazil.
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Peng CY, Xu XF, Ren YF, Niu HL, Yang YQ, Hou RY, Wan XC, Cai HM. Fluoride absorption, transportation and tolerance mechanism in Camellia sinensis, and its bioavailability and health risk assessment: a systematic review. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2021; 101:379-387. [PMID: 32623727 DOI: 10.1002/jsfa.10640] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 06/27/2020] [Accepted: 07/05/2020] [Indexed: 06/11/2023]
Abstract
Tea is the one of the most popular non-alcoholic caffeinated beverages in the world. Tea is produced from the tea plant (Camellia sinensis (L.) O. Kuntze), which is known to accumulate fluoride. This article systematically analyzes the literature concerning fluoride absorption, transportation and fluoride tolerance mechanisms in tea plants. Fluoride bioavailability and exposure levels in tea infusions are also reviewed. The circulation of fluoride within the tea plantation ecosystems is in a positive equilibrium, with greater amounts of fluoride introduced to tea orchards than removed. Water extractable fluoride and magnesium chloride (MgCl2 ) extractable fluoride in plantation soil are the main sources of absorption by tea plant root via active trans-membrane transport and anion channels. Most fluoride is readily transported through the xylem as F- /F-Al complexes to leaf cell walls and vacuole. The findings indicate that tea plants employ cell wall accumulation, vacuole compartmentalization, and F-Al complexes to co-detoxify fluoride and aluminum, a possible tolerance mechanism through which tea tolerates higher levels of fluoride than most plants. Furthermore, dietary and endogenous factors influence fluoride bioavailability and should be considered when exposure levels of fluoride in commercially available dried tea leaves are interpreted. The relevant current challenges and future perspectives are also discussed. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Chuan-Yi Peng
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, P. R. China
- Key Laboratory of Food Nutrition and Safety, School of Tea and Food Science & Technology, Anhui Agricultural University, Hefei, P. R. China
- Anhui Province Key Lab of Analysis and Detection for Food Safety, Hefei, P. R. China
| | - Xue-Feng Xu
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, P. R. China
- Key Laboratory of Food Nutrition and Safety, School of Tea and Food Science & Technology, Anhui Agricultural University, Hefei, P. R. China
- Anhui Province Key Lab of Analysis and Detection for Food Safety, Hefei, P. R. China
| | - Yin-Feng Ren
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, P. R. China
- Key Laboratory of Food Nutrition and Safety, School of Tea and Food Science & Technology, Anhui Agricultural University, Hefei, P. R. China
- Anhui Province Key Lab of Analysis and Detection for Food Safety, Hefei, P. R. China
| | - Hui-Liang Niu
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, P. R. China
- Key Laboratory of Food Nutrition and Safety, School of Tea and Food Science & Technology, Anhui Agricultural University, Hefei, P. R. China
- Anhui Province Key Lab of Analysis and Detection for Food Safety, Hefei, P. R. China
| | - Yun-Qiu Yang
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, P. R. China
- Key Laboratory of Food Nutrition and Safety, School of Tea and Food Science & Technology, Anhui Agricultural University, Hefei, P. R. China
- Anhui Province Key Lab of Analysis and Detection for Food Safety, Hefei, P. R. China
| | - Ru-Yan Hou
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, P. R. China
- Key Laboratory of Food Nutrition and Safety, School of Tea and Food Science & Technology, Anhui Agricultural University, Hefei, P. R. China
- Anhui Province Key Lab of Analysis and Detection for Food Safety, Hefei, P. R. China
| | - Xiao-Chun Wan
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, P. R. China
- Key Laboratory of Food Nutrition and Safety, School of Tea and Food Science & Technology, Anhui Agricultural University, Hefei, P. R. China
- Anhui Province Key Lab of Analysis and Detection for Food Safety, Hefei, P. R. China
| | - Hui-Mei Cai
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, P. R. China
- Key Laboratory of Food Nutrition and Safety, School of Tea and Food Science & Technology, Anhui Agricultural University, Hefei, P. R. China
- Anhui Province Key Lab of Analysis and Detection for Food Safety, Hefei, P. R. China
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Banerjee A, Singh A, Roychoudhury A. De novo RNA-Seq analysis in sensitive rice cultivar and comparative transcript profiling in contrasting genotypes reveal genetic biomarkers for fluoride-stress response. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 267:115378. [PMID: 33254681 DOI: 10.1016/j.envpol.2020.115378] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 07/13/2020] [Accepted: 08/04/2020] [Indexed: 06/12/2023]
Abstract
The fluoride-sensitive indica rice cultivar, IR-64 was subjected to NaF-treatment for 25 days, following which RNA-Seq analysis identified significant up and down regulation of 1,303 and 93 transcripts respectively. Gene ontology (GO) enrichment analysis classified transcripts into groups related to 'cellular part', 'membrane', 'catalytic activity', 'transporter activity', 'binding', 'metabolic processes' and 'cellular processes'. Analysis of differentially expressed genes (DEGs) revealed fluoride-mediated suppression of abscisic acid (ABA) biosynthesis and signaling. Instead, the gibberellin-dependent pathway and signaling via ABA-independent transcription factors (TFs) was activated. Comparative profiling of selected DEGs in IR-64 and fluoride-tolerant variety, Khitish revealed significant cytoskeletal and nucleosomal remodelling, accompanied with escalated levels of autophagy in stressed IR-64 (unlike that in stressed Khitish). Genes associated with ion, solute and xenobiotic transport were strongly up regulated in stressed IR-64, indicating potential fluoride entry through these channels. On the contrary, genes associated with xenobiotic mobility were suppressed in the tolerant cultivar, which restricted bioaccumulation and translocation of fluoride. Pairwise expression profile analysis between stressed IR-64 and Khitish, supported by extensive statistical modelling predicted that fluoride susceptibility was associated with high expression of genes like amino acid transporter, ABC transporter2, CLCd, MFS monosaccharide transporter, SulfT2.1 and PotT2 while fluoride tolerance with high expression of Sweet11.
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Affiliation(s)
- Aditya Banerjee
- Post Graduate Department of Biotechnology, St. Xavier's College (Autonomous), 30, Mother Teresa Sarani, Kolkata, 700016, West Bengal, India
| | - Ankur Singh
- Post Graduate Department of Biotechnology, St. Xavier's College (Autonomous), 30, Mother Teresa Sarani, Kolkata, 700016, West Bengal, India
| | - Aryadeep Roychoudhury
- Post Graduate Department of Biotechnology, St. Xavier's College (Autonomous), 30, Mother Teresa Sarani, Kolkata, 700016, West Bengal, India.
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Zhu J, Xing A, Wu Z, Tao J, Ma Y, Wen B, Zhu X, Fang W, Wang Y. CsFEX, a Fluoride Export Protein Gene from Camellia sinensis, Alleviates Fluoride Toxicity in Transgenic Escherichia coli and Arabidopsis thaliana. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2019; 67:5997-6006. [PMID: 31056906 DOI: 10.1021/acs.jafc.9b00509] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A fluoride export gene ( CsFEX) was newly found and isolated from Camellia sinensis, and its functions in detoxifying F were investigated in transgenic Escherichia coli and Arabidopsis thaliana. CsFEX contains two crcB domains, which is the typical structure in plants. The expression of CsFEX in C. sinensis is tissue-specific and related to maturity of leaves, and its expression is significantly induced by F treatments in different tissues of C. sinensis, particularly in leaves. Additionally, the growth of C. sinensis, E. coli, and A. thaliana can all be inhibited by F treatment. However, the growth of CsFEX-overexpression E. coli was increased with lower F content under F treatment compared to the control. Similarly, the germination and growth of CsFEX-overexpression A. thaliana were enhanced with lower F content under F treatment compared to the wild type. CsFEX relieves F toxicity in the transgenic E. coli and A. thaliana by alleviating F accumulation.
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Affiliation(s)
- Jiaojiao Zhu
- College of Horticulture , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Anqi Xing
- College of Horticulture , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Zichen Wu
- College of Horticulture , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Jing Tao
- College of Horticulture , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Yuanchun Ma
- College of Horticulture , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Bo Wen
- College of Horticulture , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Xujun Zhu
- College of Horticulture , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Wanping Fang
- College of Horticulture , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
| | - Yuhua Wang
- College of Horticulture , Nanjing Agricultural University , Nanjing , Jiangsu 210095 , People's Republic of China
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Vaziriyeganeh M, Lee SH, Zwiazek JJ. Water transport properties of root cells contribute to salt tolerance in halophytic grasses Poa juncifolia and Puccinellia nuttalliana. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2018; 276:54-62. [PMID: 30348328 DOI: 10.1016/j.plantsci.2018.08.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 07/31/2018] [Accepted: 08/02/2018] [Indexed: 06/08/2023]
Abstract
Plant water uptake and aquaporin-mediated root water transport are among the most salt-sensitive processes in most plants, but even relatively high salt concentrations do not appear to impair water transport processes in halophytes. To develop better understanding of these processes in halophytic plants, we compared the responses to NaCl of the two halophytic grasses varying in salt tolerance, Puccinellia nuttalliana and Poa juncifolia, with the glycophytic grass Poa pratensis. The plants were hydroponically grown and subjected to different NaCl concentrations for up to 10 days. At the lower NaCl concentrations, shoot and root dry weights were drastically reduced in Poa pratensis, but increased in Puccinellia nuttalliana and Poa juncifolia. The examined treatment concentrations of up to 300 mM NaCl had either no effect (Puccinellia nuttalliana) or little effect (Poa juncifolia) on the net photosynthesis and transpiration rates in plants, but severely decreased the gas exchange parameters in Poa pratensis. Similarly, to growth and gas exchange, leaf water content in Puccinellia nuttalliana was not affected even by the highest, 300 mM NaCl concentration, while Poa pratensis showed decreased shoot water content in all examined NaCl treatments and Poa juncifolia in 150 and 300 mM NaCl. Cell hydraulic conductivity in roots of Poa pratensis also showed high sensitivity to NaCl and was drastically reduced in all examined NaCl concentrations. Cell hydraulic conductivity in Poa juncifolia roots was less affected by NaCl compared with Poa pratensis and in Puccinellia nuttalliana, cell hydraulic conductivity increased in response to NaCl treatments. Both Puccinellia nuttalliana and Poa juncifolia accumulated less Na in their shoot tissues compared with Poa pratensis. The concentrations of K in the roots of Poa pratensis sharply decreased with increasing NaCl treatment concentrations while in Puccinellia nuttalliana, K root concentrations remained high in all NaCl treatments and in Poa juncifoila, root K decreased only in the 300 mM NaCl treatment. Since K efflux from the cytoplasm can contribute to the acidification of the cytoplasm, this process could potentially lead to the inhibition of aquaporin function and reduction of root hydraulic conductivity. The, significance of stable K root concentrations in the roots of halophytes should be further investigated as a possible salt tolerance mechanism that could contribute to the maintenance of aquaporin function and root water transport under salt stress conditions.
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Affiliation(s)
- Maryamsadat Vaziriyeganeh
- Department of Renewable Resources, University of Alberta, 442 Earth Sciences Bldg., Edmonton, AB, T6G 2E3, Canada
| | - Seong Hee Lee
- Department of Renewable Resources, University of Alberta, 442 Earth Sciences Bldg., Edmonton, AB, T6G 2E3, Canada
| | - Janusz J Zwiazek
- Department of Renewable Resources, University of Alberta, 442 Earth Sciences Bldg., Edmonton, AB, T6G 2E3, Canada.
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Mondal NK. Effect of fluoride on photosynthesis, growth and accumulation of four widely cultivated rice (Oryza sativa L.) varieties in India. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2017; 144:36-44. [PMID: 28600945 DOI: 10.1016/j.ecoenv.2017.06.009] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 05/26/2017] [Accepted: 06/02/2017] [Indexed: 05/18/2023]
Abstract
Long-term use of fluoride contaminated groundwater to irrigate crops; especially paddy rice (Oryza sativa L.) has resulted in elevated soil fluoride levels in Eastern India. There is, therefore, growing concern regarding accumulation of fluoride in rice grown on these soils. A laboratory experiment was conducted to investigate the effect of F on germination and phytotoxicity of four varieties of rice (Orzya sativa L.) (MTU-1010; IET-4094; IET-4786 and GB-1) grown in petri dish in a green house with inorganic sodium fluoride (NaF). Three different levels (0, 5, 10 and 20mg/L) of NaF solution were applied. At the end of the experiment (28 days), biochemical analysis (pigment, sugar, protein, amino acid and phenol), lipid peroxidation, root ion leakage and catalase activity along with fluoride accumulation and fresh and dry weight of roots and shoots of four cultivars were measured. The results revealed that all the four studied varieties exhibited gradual decrease of germination pattern with increasing concentration of F. Pigment and growth morphological study clearly demonstrated that the variety IET-4094 was the least influenced by F compare to the other three varieties of rice. The translocation factor (TF) was recorded to be the highest for variety IET-4786 (0.215 ± 0.03) at 5mg/L F concentration. All the four varieties showed higher level of fluoride accumulation in root than in shoot. Variable results were recorded for biochemical parameters and lipid peroxidation. Catalase activity and relative conductivity (root ion leakage) gradually increased with increasing F concentration for all the four varieties. It is speculated that fluoride accumulation in rice straw at very high levels will affect the feeding cattle and such contaminated straw could be a direct threat to their health and also, indirectly, to human health via presumably contaminated meat and milk.
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Affiliation(s)
- Naba Kumar Mondal
- Environmental Chemistry Laboratory, Department of Environmental Science, The University of Burdwan, 713104, India.
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Das S, de Oliveira LM, da Silva E, Ma LQ. Arsenate and fluoride enhanced each other's uptake in As-sensitive plant Pteris ensiformis. CHEMOSPHERE 2017; 180:448-454. [PMID: 28419958 DOI: 10.1016/j.chemosphere.2017.04.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 04/07/2017] [Accepted: 04/09/2017] [Indexed: 06/07/2023]
Abstract
We investigated the effects of arsenate (AsV) and fluoride (F) on each other's uptake in an As-sensitive plant Pteris ensiformis. Plants were exposed to 1) 0.1 × Hoagland solution control, 2) 3.75 mg L-1 As and 1.9, 3.8, or 7.6 mg L-1 F, or 3) 1 mg L-1 F and 3.75 mg L-1 or 7.5 mg L-1 As for 7 d in hydroponics. P. ensiformis accumulated 14.7-32.6 mg kg-1 As at 3.75 mg L-1 AsV, and 99-145 mg kg-1 F at 1 mg L-1 F. Our study revealed that AsV and F increased each other's uptake when co-present. At 1.9 mg L-1, F increased frond As uptake from 14.7 to 40.3 mg kg-1, while 7.5 mg L-1 As increased frond F uptake from 99 to 371 mg kg-1. Although, AsV was the predominant As species in all tissues, F enhanced AsIII levels in the rhizomes and fronds, while the reverse was observed in the roots. Increasing As concentrations also enhanced TBARS and H2O2 in tissues, indicating oxidative stress. However, F alleviated As stress by lowering their levels in the fronds. Frond and root membrane leakage were also evident due to As or F exposure. The results may facilitate better understanding of the mechanisms underlying the co-uptake of As and F in plants. However, the mechanisms of how they enhance each other's uptake in P. ensiformis need further investigation.
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Affiliation(s)
- Suchismita Das
- Soil and Water Science Department, University of Florida, Gainesville, FL, 32611, United States; Life Science and Bioinformatics, Assam University, Silchar, India
| | - Letuzia M de Oliveira
- Soil and Water Science Department, University of Florida, Gainesville, FL, 32611, United States
| | - Evandro da Silva
- Soil and Water Science Department, University of Florida, Gainesville, FL, 32611, United States
| | - Lena Q Ma
- Soil and Water Science Department, University of Florida, Gainesville, FL, 32611, United States; State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210046, People's Republic of China.
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15
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Lee SH, Zwiazek JJ. Regulation of aquaporin-mediated water transport in Arabidopsis roots exposed to NaCl. PLANT & CELL PHYSIOLOGY 2015; 56:750-8. [PMID: 25604052 DOI: 10.1093/pcp/pcv003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Accepted: 01/06/2015] [Indexed: 05/20/2023]
Abstract
The effects of Ca(NO3)2, KF and okadaic acid (OA) on cell hydraulic responses to NaCl were examined in roots of Arabidopsis thaliana wild-type plants and compared with plants overexpressing plasma membrane intrinsic protein PIP2;5. Root treatment with 10 mM NaCl rapidly and sharply reduced cell hydraulic conductivity (L(p)) in the wild-type Arabidopsis plants, but had no effect on L(p) in Arabidopsis plants overexpressing PIP2;5, suggesting that changes in protein and aquaporin gene expression were among the initial targets responsible for the inhibition of L(p) by NaCl. The down-regulation of PIP transcripts after 1 h exposure to 10 mM NaCl was likely a significant factor in the reduction of L(p). The effect of NaCl on L(p) in the wild-type plants was abolished when the NaCl-treated roots were subsequently exposed to 5 mM KF, 5 mM Ca(NO3)2 and 5 µM OA. The reduction of L(p) by 5 mM KF could not be prevented by treatment with 5 mM Ca(NO3)2 in both wild-type and PIP2;5-overexpressing plants. However, 5 µM OA, which was added following NaCl or KF treatment, completely reversed L(p) within several minutes. The results provide evidence for high sensitivity of aquaporin-mediated water transport to relatively low NaCl concentrations and point to the phosphorylation and/or dephosphorylation processes as those that are likely responsible for the protection of L(p) by fluoride and calcium treatments against the effects of NaCl.
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Affiliation(s)
- Seong H Lee
- Department of Renewable Resources, University of Alberta, 442 Earth Sciences Bldg., T6G 2E3, Edmonton, AB, Canada
| | - Janusz J Zwiazek
- Department of Renewable Resources, University of Alberta, 442 Earth Sciences Bldg., T6G 2E3, Edmonton, AB, Canada
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Zouari M, Ben Ahmed C, Fourati R, Delmail D, Ben Rouina B, Labrousse P, Ben Abdallah F. Soil fluoride spiking effects on olive trees (Olea europaea L. cv. Chemlali). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2014; 108:78-83. [PMID: 25042248 DOI: 10.1016/j.ecoenv.2014.06.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Revised: 05/23/2014] [Accepted: 06/19/2014] [Indexed: 06/03/2023]
Abstract
A pot experiment under open air conditions was carried out to investigate the uptake, accumulation and toxicity effects of fluoride in olive trees (Olea europaea L.) grown in a soil spiked with inorganic sodium fluoride (NaF). Six different levels (0, 20, 40, 60, 80 and 100mM NaF) of soil spiking were applied through NaF to irrigation water. At the end of the experiment, total fluoride content in soil was 20 and 1770mgFkg(-1) soil in control and 100mM NaF treatments, respectively. The comparative distribution of fluoride partitioning among the different olive tree parts showed that the roots accumulated the most fluoride and olive fruits were minimally affected by soil NaF spiking as they had the lowest fluoride content. In fact, total fluoride concentration varied between 12 and 1070µgFg(-1) in roots, between 9 and 570µgFg(-1) in shoots, between 12 and 290µgFg(-1) in leaves, and between 10 and 29µgFg(-1) in fruits, respectively for control and 100mM NaF treatments. Indeed, the fluoride accumulation pattern showed the following distribution: roots>shoots>leaves>fruits. On the other hand, fluoride toxicity symptoms such as leaf necrosis and leaf drop appeared only in highly spiked soils (60, 80 and 100mM NaF).
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Affiliation(s)
- M Zouari
- Laboratory of Plant Biodiversity and Dynamic of Ecosystems in Arid Area, Faculty of Sciences of Sfax, B.P. 1171, Sfax 3000, Tunisia; Laboratory of Improvement of Olive Productivity and Fruit Trees, Olive Tree Institute of Sfax, B.P. 1087, Sfax 3018, Tunisia; University of Limoges, Faculty of Pharmacy, Laboratory of Botany and Cryptogamy, GRESE EA 4330, 2 rue du Docteur Marcland, F-87025 Limoges, France.
| | - C Ben Ahmed
- Laboratory of Plant Biodiversity and Dynamic of Ecosystems in Arid Area, Faculty of Sciences of Sfax, B.P. 1171, Sfax 3000, Tunisia; Laboratory of Improvement of Olive Productivity and Fruit Trees, Olive Tree Institute of Sfax, B.P. 1087, Sfax 3018, Tunisia
| | - R Fourati
- Laboratory of Plant Biodiversity and Dynamic of Ecosystems in Arid Area, Faculty of Sciences of Sfax, B.P. 1171, Sfax 3000, Tunisia
| | - D Delmail
- Institute of Chemical Sciences of Rennes, CNRS UMR 6226, University of Rennes, 2, Avenue of Professor Léon Bernard F-35043 RENNES Cedex, France
| | - B Ben Rouina
- Laboratory of Improvement of Olive Productivity and Fruit Trees, Olive Tree Institute of Sfax, B.P. 1087, Sfax 3018, Tunisia
| | - P Labrousse
- University of Limoges, Faculty of Pharmacy, Laboratory of Botany and Cryptogamy, GRESE EA 4330, 2 rue du Docteur Marcland, F-87025 Limoges, France.
| | - F Ben Abdallah
- Laboratory of Plant Biodiversity and Dynamic of Ecosystems in Arid Area, Faculty of Sciences of Sfax, B.P. 1171, Sfax 3000, Tunisia
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X-ray photoelectron spectroscopy surface analysis of fluoride stress in tea (Camellia sinensis (L.) O. Kuntze) leaves. J Fluor Chem 2014. [DOI: 10.1016/j.jfluchem.2013.11.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Variation of photosynthesis, fatty acid composition, ATPase and acid phosphatase activities, and anatomical structure of two tea (Camellia sinensis (L.) O. Kuntze) cultivars in response to fluoride. ScientificWorldJournal 2013; 2013:109367. [PMID: 24023526 PMCID: PMC3760106 DOI: 10.1155/2013/109367] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Accepted: 06/16/2013] [Indexed: 11/17/2022] Open
Abstract
The changes of photosynthetic parameters, water use efficiency (WUE), fatty acid composition, chlorophyll (Chl) content, malondialdehyde (MDA) content, ATPase and acid phosphatase activities, fluoride (F) content, and leaf anatomical structure of two tea cultivars, “Pingyangtezao” (PY) and “Fudingdabai” (FD), after F treatments were investigated. The results show that net photosynthetic rate (Pn), stomatal conductance (gs), and transpiration rate (E) significantly decreased in both cultivars after 0.3 mM F treatment, but FD had higher Pn, gs, and WUE and lower E than PY. Chl content in PY significantly decreased after 0.2 and 0.3 mM F treatments, while no significant changes were observed in FD. The proportions of shorter chain and saturated fatty acids increased and those of longer chain and unsaturated fatty acids decreased in both cultivars under F treatments. The contents of MDA increased after F treatments but were higher in PY than in FD. In addition, F treatments decreased the activities of ATPase and acid phosphatase and increased F content in both cultivars; however, compared with PY, FD showed higher enzymatic activities and lower F content in roots and leaves. Leaf anatomical structure in FD indicated that cells in leaf midrib region were less injured by F than in PY.
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Almeida-Rodriguez AM, Hacke UG, Laur J. Influence of evaporative demand on aquaporin expression and root hydraulics of hybrid poplar. PLANT, CELL & ENVIRONMENT 2011; 34:1318-31. [PMID: 21477124 DOI: 10.1111/j.1365-3040.2011.02331.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
When light levels and evaporative demand increase, dynamic physiological changes in roots may be required to restore the water balance at the whole plant level. We hypothesized that a dynamic increase in root hydraulic conductance (L(P)) and aquaporin (AQP) expression could moderate the transpiration-induced drop in water potential (Ψ), allowing continued gas exchange in hybrid poplar (Populus trichocarpa × deltoides) saplings. Fifty-six AQPs have been identified in poplar, but little information about their expression patterns in roots is available, especially from a whole-plant water relations perspective. We measured AQP expression and L(P) in plants subjected to different levels of light and evaporative demand. Shaded plants had only one-tenth the root area of plants growing at higher light levels. Shade-grown saplings experiencing a sudden increase in light exhibited a threefold higher L(P) than plants remaining in shade. This dynamic increase in L(P) corresponded with increased transcript abundance of 15 AQPs out of a total of 33 genes simultaneously assessed by quantitative RT-PCR. The tissue-level localization of transcripts of four AQPs was studied with in situ hybridization. Comprehensive expression profiling in conjunction with physiological and morphological measurements is a valuable reference for future studies on AQP function in poplar.
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Lee SH, Calvo-Polanco M, Chung GC, Zwiazek JJ. Role of aquaporins in root water transport of ectomycorrhizal jack pine (Pinus banksiana) seedlings exposed to NaCl and fluoride. PLANT, CELL & ENVIRONMENT 2010; 33:769-80. [PMID: 20040068 DOI: 10.1111/j.1365-3040.2009.02103.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Effects of ectomycorrhizal (ECM) fungus Suillus tomentosus on water transport properties were studied in jack pine (Pinus banksiana) seedlings. The hydraulic conductivity of root cortical cells (L(pc)) and of the whole root system (L(pr)) in ECM plants was higher by twofold to fourfold compared with the non-ECM seedlings. HgCl2 had a greater inhibitory effect on L(pc) in ECM compared with non-ECM seedlings, suggesting that the mercury-sensitive, aquaporin (AQP)-mediated water transport was largely responsible for the differences in L(pc) between the two groups of plants. L(pc) was rapidly and drastically reduced by the 50 mM NaCl treatment. However, in ECM plants, the initial decline in L(pc) was followed by a quick recovery to the pre-treatment level, while the reduction of L(pc) in non-ECM seedlings progressed over time. Treatments with fluoride reduced L(pc) by about twofold in non-ECM seedlings and caused smaller reductions of L(pc) in ECM plants. When either 2 mM KF or 2 mM NaF were added to the 50 mM NaCl treatment solution, the inhibitory effect of NaCl on L(pc) was rapidly reversed in both groups of plants. The results suggest that AQP-mediated water transport may be linked to the enhancement of salt stress resistance reported for ECM plants.
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Affiliation(s)
- Seong Hee Lee
- Department of Renewable Resources, University of Alberta, Edmonton, AB, Canada
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Voicu MC, Zwiazek JJ. Inhibitor studies of leaf lamina hydraulic conductance in trembling aspen (Populus tremuloides Michx.) leaves. TREE PHYSIOLOGY 2010; 30:193-204. [PMID: 20022867 DOI: 10.1093/treephys/tpp112] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The present study investigated leaf water transport properties in trembling aspen (Populus tremuloides) leaves. Leaf lamina hydraulic conductance (K(lam)) and stomatal conductance (g(s)) were drastically suppressed by NaF (a general metabolic inhibitor). In leaves treated with 0.2 mM HgCl(2) (an aquaporin blocker), K(lam) declined by 22% when the leaves were sampled in June but the decline was not significant when the leaves were sampled in August. The leaves sampled in June that transpired 30 mM beta-mercaptoethanol following mercury application showed similar K(lam) as those in control leaves transpiring distilled water. When leaves were pressure-infiltrated with 0.1 mM HgCl(2), K(lam) significantly declined by 25%. Atrazine (a photosystem II inhibitor) drastically reduced leaf net CO(2) uptake by the leaves from seedlings and mature trees but did not have any effect on K(lam) regardless of the irradiance at the leaf level during the K(lam) measurements. When PTS(3) (trisodium 3-hydroxy-5,8,10-pyrenetrisulphonate) apoplastic tracer was pressure-infiltrated inside the leaves, its concentration in the leaf exudates did not change from ambient light to high irradiance treatment and declined in the presence of HgCl(2) in the treatment solution. Trembling aspen K(lam) appears to be linked to leaf metabolism and is uncoupled from the short-term variations in photosynthesis. Aquaporin-mediated water transport does not appear to constitute the dominant pathway for the pressure-driven water flow in the leaves of trembling aspen trees.
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Affiliation(s)
- Mihaela C Voicu
- Department of Renewable Resources, University of Alberta, Edmonton, Alberta, Canada
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Calvo-Polanco M, Zwiazek JJ, Jones MD, MacKinnon MD. Effects of NaCl on responses of ectomycorrhizal black spruce (Picea mariana), white spruce (Picea glauca) and jack pine (Pinus banksiana) to fluoride. PHYSIOLOGIA PLANTARUM 2009; 135:51-61. [PMID: 19121099 DOI: 10.1111/j.1399-3054.2008.01170.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Black spruce (Picea mariana), white spruce (Picea glauca) and jack pine (Pinus banksiana) were inoculated with Suillus tomentosus and subjected to potassium fluoride (1 mM KF and 5 mM KF) in the presence and absence of 60 mM NaCl. The NaCl and KF treatments reduced total dry weights in jack pine and black spruce seedlings, but they did not affect total dry weights in white spruce seedlings. The addition of 60 mM NaCl to KF treatment solutions alleviated fluoride-induced needle injury in ectomycorrhizal (ECM) black spruce and white spruce, but had little effect in jack pine seedlings. Both KF and 60 mM NaCl treatments reduced E values compared with non-treated control seedlings. However, with the exception of small reductions of K(r) by NaCl treatments in black spruce, the applied KF and NaCl treatments had little effect on K(r) in ECM plants. Chloride tissue concentrations in NaCl-treated plants were not affected by the presence of KF in treatment solutions. However, shoot F concentrations in ECM black spruce and white spruce treated with 5 mM KF + 60 mM NaCl were significantly reduced compared with the 5 mM KF treatment. The results point to a possible competitive inhibition of F transport by Cl. We also suggest that the possibility that aquaporins may be involved in the transmembrane transport of F should be further investigated.
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