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Mukherjee S, Corpas FJ. H 2 O 2 , NO, and H 2 S networks during root development and signalling under physiological and challenging environments: Beneficial or toxic? PLANT, CELL & ENVIRONMENT 2023; 46:688-717. [PMID: 36583401 PMCID: PMC10108057 DOI: 10.1111/pce.14531] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 12/25/2022] [Accepted: 12/27/2022] [Indexed: 05/27/2023]
Abstract
Hydrogen peroxide (H2 O2 ) is a reactive oxygen species (ROS) and a key modulator of the development and architecture of the root system under physiological and adverse environmental conditions. Nitric oxide (NO) and hydrogen sulphide (H2 S) also exert myriad functions on plant development and signalling. Accumulating pieces of evidence show that depending upon the dose and mode of applications, NO and H2 S can have synergistic or antagonistic actions in mediating H2 O2 signalling during root development. Thus, H2 O2 -NO-H2 S crosstalk might essentially impart tolerance to elude oxidative stress in roots. Growth and proliferation of root apex involve crucial orchestration of NO and H2 S-mediated ROS signalling which also comprise other components including mitogen-activated protein kinase, cyclins, cyclin-dependent kinases, respiratory burst oxidase homolog (RBOH), and Ca2+ flux. This assessment provides a comprehensive update on the cooperative roles of NO and H2 S in modulating H2 O2 homoeostasis during root development, abiotic stress tolerance, and root-microbe interaction. Furthermore, it also analyses the scopes of some fascinating future investigations associated with strigolactone and karrikins concerning H2 O2 -NO-H2 S crosstalk in plant roots.
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Affiliation(s)
- Soumya Mukherjee
- Department of Botany, Jangipur CollegeUniversity of KalyaniWest BengalIndia
| | - Francisco J. Corpas
- Group of Antioxidants, Free Radicals and Nitric Oxide in Biotechnology, Food and Agriculture, Department of Stress, Development and Signalling in PlantsEstación Experimental del Zaidín (Spanish National Research Council, CSIC)GranadaSpain
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2
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Xu L, Li Z, Zhuang B, Zhou F, Li Z, Pan X, Xi H, Zhao W, Liu H. Enrofloxacin perturbs nitrogen transformation and assimilation in rice seedlings (Oryza sativa L.). THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 802:149900. [PMID: 34525725 DOI: 10.1016/j.scitotenv.2021.149900] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 08/21/2021] [Accepted: 08/21/2021] [Indexed: 06/13/2023]
Abstract
The extensive use of antibiotics worldwide has led to phytotoxicity and high risks to humans. Although research on the physiological toxicity of antibiotics is extensive, its influence on plant nitrogen uptake and assimilation remains unclear. The effect of enrofloxacin on nitrogen transformation and assimilation in rice (Oryza sativa L.) seedlings was investigated in this study. Enrofloxacin had no significant effect on rice growth, nitrogen assimilation and metabolism at low concentration, while significant changes were observed in high concentration. The growth of rice seedlings was inhibited, nitrate uptake was enhanced and nitrogen content increased significantly in both shoots and roots in enrofloxacin (800 μg L-1) treatment. Furthermore, enrofloxacin promoted the activity of enzymes related to nitrogen assimilation, including nitrate reductase, nitrite reductase, glutamine synthetase, glutamate synthase, and glutamate dehydrogenase. High enzyme activity resulted in an increase in intermediate products and protein content, suggesting that rice seedlings may detoxify enrofloxacin stress through amino acid binding and nitro-oxidative stress might be one of the reasons of phenotype change. Gas chromatography-mass spectrometry results revealed that different types of metabolites in both shoots and roots increased with enrofloxacin stress. Specifically, glycine, serine, and threonine metabolism; aminoacyl-tRNA biosynthesis; alanine, aspartate, and glutamate metabolism; butanoate metabolism; glyoxylate and dicarboxylate metabolism in shoot; and tyrosine metabolism and citrate cycle in root were affected. Moreover, a significant correlation between nitrogen content, nitrogen assimilation enzyme activity, and metabolite content was observed. Collectively, these findings reveal the potential risks of using reclaimed wastewater irrigation and/or antibiotic-containing animal fertilizers on crops.
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Affiliation(s)
- Linglin Xu
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang Province, China
| | - Zhiheng Li
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang Province, China
| | - Biyan Zhuang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang Province, China
| | - Fumin Zhou
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang Province, China
| | - Zejun Li
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang Province, China
| | - Xiaoru Pan
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang Province, China
| | - Hao Xi
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang Province, China
| | - Wenlu Zhao
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang Province, China
| | - Huijun Liu
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, Zhejiang Province, China; Instrumental Analysis Center of Zhejiang Gongshang University, Hangzhou 310018, Zhejiang Province, China.
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3
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Svobodníková L, Kummerová M, Zezulka Š, Babula P, Sendecká K. Root response in Pisum sativum under naproxen stress: Morpho-anatomical, cytological, and biochemical traits. CHEMOSPHERE 2020; 258:127411. [PMID: 32947668 PMCID: PMC7308076 DOI: 10.1016/j.chemosphere.2020.127411] [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: 04/29/2020] [Revised: 06/10/2020] [Accepted: 06/11/2020] [Indexed: 05/04/2023]
Abstract
Non-steroidal anti-inflammatory drugs as an important group of emerging environmental contaminants in irrigation water and soils can influence biochemical and physiological processes essential for growth and development in plants as non-target organisms. Plants are able to take up, transport, transform, and accumulate drugs in the roots. Root biomass in ten-days old pea plants was lowered by 6% already under 0.1 mg/L naproxen (NPX) due to a lowered number of lateral roots, although 0.5 mg/L NPX stimulated the total root length by 30% as against control. Higher section area (by 40%) in root tip, area of xylem (by 150%) or stele-to-section ratio (by 10%) in zone of maturation, and lower section area in zone of lateral roots (by 18%) prove the changes in primary root anatomy and its earlier differentiation at 10 mg/L NPX. Accumulated NPX (up to 10 μg/g DW at 10 mg/L) and products of its metabolization in roots increased the amounts of hydrogen peroxide (by 33%), and superoxide (by 62%), which was reflected in elevated lipid peroxidation (by 32%), disruption of membrane integrity (by 89%) and lowering both oxidoreductase and dehydrogenase activities (by up to 40%). Elevated antioxidant capacity (SOD, APX, and other molecules) under low treatments decreased at 10 mg/L NPX (both by approx. 30%). Naproxen was proved to cause changes at both cellular and tissue levels in roots, which was also reflected in their anatomy and morphology. Higher environmental loading through drugs thus can influence even the root function.
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Affiliation(s)
- Lucie Svobodníková
- Section of Experimental Plant Biology, Dep. of Experimental Biology, Faculty of Science, Masaryk University Brno, Kotlářská 2, 611 37, Brno, Czech Republic.
| | - Marie Kummerová
- Section of Experimental Plant Biology, Dep. of Experimental Biology, Faculty of Science, Masaryk University Brno, Kotlářská 2, 611 37, Brno, Czech Republic.
| | - Štěpán Zezulka
- Section of Experimental Plant Biology, Dep. of Experimental Biology, Faculty of Science, Masaryk University Brno, Kotlářská 2, 611 37, Brno, Czech Republic.
| | - Petr Babula
- Department of Physiology, Faculty of Medicine, Masaryk University Brno, Kamenice 753/5, 625 00, Brno, Czech Republic.
| | - Katarína Sendecká
- Laboratory of Metabolomics and Isotope Analyses, Global Change Research Institute, Czech Academy of Sciences, Bělidla 986/4a, 603 00, Brno, Czech Republic.
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Chen Z, Zhao X, Hu Z, Leng P. Nitric oxide modulating ion balance in Hylotelephium erythrostictum roots subjected to NaCl stress based on the analysis of transcriptome, fluorescence, and ion fluxes. Sci Rep 2019; 9:18317. [PMID: 31797954 PMCID: PMC6892800 DOI: 10.1038/s41598-019-54611-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 11/14/2019] [Indexed: 11/08/2022] Open
Abstract
Soil salinization is one of the main stress factors that affect both growth and development of plants. Hylotelephium erythrostictum exhibits strong resistance to salt, but the underlying genetic mechanisms remain unclear. In this study, hydroponically cultured seedlings of H. erythrostictum were exposed to 200 mM NaCl. RNA-Seq was used to determine root transcriptomes at 0, 5, and 10 days, and potential candidate genes with differential expression were analyzed. Transcriptome sequencing generated 89.413 Gb of raw data, which were assembled into 111,341 unigenes, 82,081 of which were annotated. Differentially expressed genes associated to Na+ and K+ transport, Ca2+ channel, calcium binding protein, and nitric oxide (NO) biosynthesis had high expression levels in response to salt stress. An increased fluorescence intensity of NO indicated that it played an important role in the regulation of the cytosolic K+/Na+ balance in response to salt stress. Exogenous NO donor and NO biosynthesis inhibitors significantly increased and decreased the Na+ efflux, respectively, thus causing the opposite effect for K+ efflux. Moreover, under salt stress, exogenous NO donors and NO biosynthesis inhibitors enhanced and reduced Ca2+ influx, respectively. Combined with Ca2+ reagent regulation of Na+ and K+ fluxes, this study identifies how NaCl-induced NO may function as a signaling messenger that modulates the K+/Na+ balance in the cytoplasm via the Ca2+ signaling pathway. This enhances the salt resistance in H. erythrostictum roots.
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Affiliation(s)
- Zhixin Chen
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing University of Agriculture, Beijing, 102206, China
- College of Landscape Architecture, Beijing University of Agriculture, Beijing, 102206, China
| | - Xueqi Zhao
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing University of Agriculture, Beijing, 102206, China
- College of Landscape Architecture, Beijing University of Agriculture, Beijing, 102206, China
| | - Zenghui Hu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing University of Agriculture, Beijing, 102206, China.
- College of Landscape Architecture, Beijing University of Agriculture, Beijing, 102206, China.
- Beijing Collaborative Innovation Center for Eco-environmental Improvement with Forestry and Fruit Trees, Beijing, 102206, China.
- Beijing Laboratory of Urban and Rural Ecological Environment, Beijing, 102206, China.
| | - Pingsheng Leng
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing University of Agriculture, Beijing, 102206, China.
- College of Landscape Architecture, Beijing University of Agriculture, Beijing, 102206, China.
- Beijing Collaborative Innovation Center for Eco-environmental Improvement with Forestry and Fruit Trees, Beijing, 102206, China.
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5
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Niu L, Yu J, Liao W, Xie J, Yu J, Lv J, Xiao X, Hu L, Wu Y. Proteomic Investigation of S-Nitrosylated Proteins During NO-Induced Adventitious Rooting of Cucumber. Int J Mol Sci 2019; 20:E5363. [PMID: 31661878 PMCID: PMC6862188 DOI: 10.3390/ijms20215363] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 10/19/2019] [Accepted: 10/23/2019] [Indexed: 02/07/2023] Open
Abstract
Nitric oxide (NO) acts an essential signaling molecule that is involved in regulating various physiological and biochemical processes in plants. However, whether S-nitrosylation is a crucial molecular mechanism of NO is still largely unknown. In this study, 50 μM S-nitrosoglutathione (GSNO) treatment was found to have a maximum biological effect on promoting adventitious rooting in cucumber. Meanwhile, removal of endogenous NO significantly inhibited the development of adventitious roots implying that NO is responsible for promoting the process of adventitious rooting. Moreover, application of GSNO resulted in an increase of intracellular S-nitrosothiol (SNO) levels and endogenous NO production, while decreasing the S-nitrosoglutathione reductase (GSNOR) activity during adventitious rooting, implicating that S-nitrosylation might be involved in NO-induced adventitious rooting in cucumber. Furthermore, the identification of S-nitrosylated proteins was performed utilizing the liquid chromatography/mass spectrometry/mass spectrometry (LC-MS/MS) and biotin-switch technique during the development of adventitious rooting. Among these proteins, the activities and S-nitrosylated level of glyceraldehyde-3-phosphate dehydrogenase (GAPDH), tubulin alpha chain (TUA), and glutathione reductase (GR) were further analyzed as NO direct targets. Our results indicated that NO might enhance the S-nitrosylation level of GAPDH and GR, and was found to subsequently reduce these activities and transcriptional levels. Conversely, S-nitrosylation of TUA increased the expression level of TUA. The results implied that S-nitrosylation of key proteins seems to regulate various pathways through differential S-nitrosylation during adventitious rooting. Collectively, these results suggest that S-nitrosylation could be involved in NO-induced adventitious rooting, and they also provide fundamental evidence for the molecular mechanism of NO signaling during adventitious rooting in cucumber explants.
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Affiliation(s)
- Lijuan Niu
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China.
| | - Jihua Yu
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China.
| | - Weibiao Liao
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China.
| | - Jianming Xie
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China.
| | - Jian Yu
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China.
| | - Jian Lv
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China.
| | - Xuemei Xiao
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China.
| | - Linli Hu
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China.
| | - Yue Wu
- College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China.
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Zhao Y, Wei X, Ji X, Ma W. Endogenous NO-mediated transcripts involved in photosynthesis and carbohydrate metabolism in alfalfa (Medicago sativa L.) seedlings under drought stress. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2019; 141:456-465. [PMID: 31247428 DOI: 10.1016/j.plaphy.2019.06.023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/15/2019] [Accepted: 06/16/2019] [Indexed: 06/09/2023]
Abstract
Alfalfa (Medicago sativa L.) is an important perennial legume and used as a forage crop worldwide, and has extensive resistance to various abiotic stresses. Nitric oxide (NO) plays a critical role in response to external and internal cues to regulate plant growth and development. However, endogenous NO-mediated molecular mechanisms of drought tolerance in alfalfa is poorly understood. To get a deeper insight into the regulate pathway of NO, RNA-Seq was used to profile transcriptome changes of alfalfa seedlings, which were treated with NO scavenger under normal and drought conditions. A total of 1,025 and 3,461 differently-expressed genes (FDR < 0.0001; fold change ≥ 2) were observed while NO absence under normal and drought conditions, respectively. Based on GO enrich and KEGG pathway analysis, we found NO absence induced photosynthesis, carbon fixation in photosynthetic organisms and primary metabolism were significantly up-enriched. Most oxidoreductase, dehydrogenase, reductase and transferase genes were down-regulated in the above processes. Moreover, NO absence restrained chlorophyll biosynthesis and decreased different sugar content. Therefore, this work provides insights into the mechanism that NO-mediated enhanced photosynthesis and carbohydrate metabolism in alfalfa under drought stress.
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Affiliation(s)
- Ying Zhao
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, 730070, PR China
| | - Xiaohong Wei
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, 730070, PR China.
| | - Xiangzhuo Ji
- College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, PR China
| | - Wenjing Ma
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, 730070, PR China
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7
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Zezulka Š, Kummerová M, Babula P, Hájková M, Oravec M. Sensitivity of physiological and biochemical endpoints in early ontogenetic stages of crops under diclofenac and paracetamol treatments. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:3965-3979. [PMID: 30552611 DOI: 10.1007/s11356-018-3930-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 12/04/2018] [Indexed: 06/09/2023]
Abstract
Early stages of ontogenesis determining subsequent growth, development, and productivity of crops can be affected by wastewater and sludge contaminated with pharmaceuticals. Diclofenac (DCF) and paracetamol (PCT; both 0.0001 to 10 mg/L) did not affect seed germination and primary root length of onion, lettuce, pea, and tomato. Conversely, 20-day-old pea and maize plants exhibited decrease in biomass production, leaf area (by approx. 40% in pea and 70% in maize under 10 mg/L DCF), or content of photosynthetic pigments (by 10% and 60% under 10 mg/L PCT). Quantum yields of photosystem II were reduced only in maize (FV/FM and ΦII by more than 40% under 10 mg/L of both pharmaceuticals). Contents of H2O2 and superoxide increased in roots of both species (more than four times under 10 mg/L PCT in pea). Activities of antioxidant enzymes were elevated in pea under DCF treatments, but decreased in maize under both pharmaceuticals. Oxidative injury of root cells expressed as lowered oxidoreductase activity (MTT assay, by 40% in pea and 80% in maize) and increase in malondialdehyde content (by 60% and 100%) together with the membrane integrity disruption (higher Evans Blue accumulation, by 100% in pea and 300% in maize) confirmed higher sensitivity of maize as a C4 monocot plant to both pharmaceuticals.
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Affiliation(s)
- Štěpán Zezulka
- Department of Plant Physiology and Anatomy (ÚEB-FAR), Institute of Experimental Biology, Faculty of Science, Masaryk University Brno, Kotlářská 267/2, 611 37, Brno, Czech Republic.
| | - Marie Kummerová
- Department of Plant Physiology and Anatomy (ÚEB-FAR), Institute of Experimental Biology, Faculty of Science, Masaryk University Brno, Kotlářská 267/2, 611 37, Brno, Czech Republic
| | - Petr Babula
- Dep. of Physiology, Faculty of Medicine, Masaryk University Brno, Kamenice 753/5, 625 00, Brno, Czech Republic
| | - Markéta Hájková
- Department of Plant Physiology and Anatomy (ÚEB-FAR), Institute of Experimental Biology, Faculty of Science, Masaryk University Brno, Kotlářská 267/2, 611 37, Brno, Czech Republic
| | - Michal Oravec
- Laboratory of Metabolomics and Isotope Analyses, Global Change Research Institute, Czech Academy of Sciences, Bělidla 986/4a, 603 00, Brno, Czech Republic
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Kushwaha BK, Singh S, Tripathi DK, Sharma S, Prasad SM, Chauhan DK, Kumar V, Singh VP. New adventitious root formation and primary root biomass accumulation are regulated by nitric oxide and reactive oxygen species in rice seedlings under arsenate stress. JOURNAL OF HAZARDOUS MATERIALS 2019; 361:134-140. [PMID: 30176411 DOI: 10.1016/j.jhazmat.2018.08.035] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 08/09/2018] [Accepted: 08/10/2018] [Indexed: 05/23/2023]
Abstract
Nitric oxide (NO) and reactive oxygen species (ROS) are important signaling molecules regulating development of plants. However under metal stress, in developmental processes of plants their implications are not largely known. Therefore, in the present study, role of NO and ROS crosstalk in the regulation of formation of new adventitious roots (NARs) and primary root biomass accumulation (PRBA) has been investigated in rice seedlings under arsenate (AsV) stress. Addition of sodium nitroprusside (SNP, a donor of NO) induced formation of NARs, increased PRBA, and maintained the redox status of ascorbate and cell cycle dynamics. However, addition of NG-nitro-l-arginine methyl ester (L-NAME, an inhibitor of nitric oxide synthase) and 2-4-carboxyphenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (c-PTIO, a NO scavenger) either in presence of SNP or in its absence blocked formation of NARs and reduced PRBA. Further, to decipher crosstalk of NO and ROS, we used diphenylene iodonium (DPI, an inhibitor of NADPH oxidase), and even in presence of SNP it blocked formation of NARs which indicate that ROS are also essential for formation of NARs. Further a connection of NO-ROS signaling with the redox status of ascorbate and the cell cycle dynamics, governing formation of NARs and PRBA in rice seedlings under AsV stress is discussed.
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Affiliation(s)
- Bishwajit Kumar Kushwaha
- Government Ramanuj Pratap Singhdev Post Graduate College, Baikunthpur, 497335, Koriya, Chhattisgarh, India; Department of Environmental Science and Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, India
| | - Samiksha Singh
- Ranjan Plant Physiology and Biochemistry Laboratory, Department of Botany, University of Allahabad, Allahabad, 211002, India
| | - Durgesh Kumar Tripathi
- Department of Biotechnology, Motilal Nehru National Institute of Technology, Allahabad, 211004, India.
| | - Shivesh Sharma
- Department of Biotechnology, Motilal Nehru National Institute of Technology, Allahabad, 211004, India
| | - Sheo Mohan Prasad
- Ranjan Plant Physiology and Biochemistry Laboratory, Department of Botany, University of Allahabad, Allahabad, 211002, India.
| | - Devendra Kumar Chauhan
- D D Pant Interdisciplinary Research Lab, Department of Botany, University of Allahabad, Allahabad, 211002, India
| | - Vipin Kumar
- Department of Environmental Science and Engineering, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, India
| | - Vijay Pratap Singh
- Government Ramanuj Pratap Singhdev Post Graduate College, Baikunthpur, 497335, Koriya, Chhattisgarh, India.
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Sun C, Dudley S, McGinnis M, Gan J. Hydrogen peroxide mediates triclosan-induced inhibition of root growth in wheat seedlings. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 243:472-479. [PMID: 30216879 DOI: 10.1016/j.envpol.2018.08.088] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 08/03/2018] [Accepted: 08/26/2018] [Indexed: 06/08/2023]
Abstract
Triclosan, an extensively used antimicrobial agent, enters agroecosystems when sewage sludge and reclaimed water are applied to agricultural fields, and may trigger a series of plant physiological and biochemical responses. However, few studies have investigated the mechanism by which plant development is affected by triclosan. Here, microscopic, pharmacological and biochemical analyses, and histochemical dye staining were used to explore the effects of triclosan on root growth in wheat plants. Exposure to triclosan inhibited root elongation, and significantly triggered hydrogen peroxide (H2O2) production and lipid peroxidation in wheat roots. The inhibition of root growth by triclosan was reversed by dimethylthiourea, a H2O2 scavenger, indicating that alterations of endogenous H2O2 concentrations in root cells were likely linked to triclosan-induced root growth inhibition. The addition of butylated hydroxyanisole, a lipophilic antioxidant, during triclosan treatment completely prevented the increase of lipid peroxidation, but did not alleviate triclosan-induced reduction of root growth. In triclosan-treated wheat roots, the level of indole-3-acetic acid decreased by 68.3%, while the contents of two indole-3-acetic acid oxidative metabolites, indole-3-aldehyde and indole-3-carboxylic acid, increased by 71.3% and 314.4%, respectively. Moreover, the oxidation of auxin induced by triclosan in wheat roots was prevented by dimethylthiourea. These results together suggested that the triclosan-enhanced production of H2O2 induced auxin oxidation, thus leading to the suppression of root growth. Findings of this study improve our mechanistic understanding on how antimicrobial agents such as triclosan affect plant root growth.
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Affiliation(s)
- Chengliang Sun
- Department of Environmental Sciences, University of California, Riverside, CA, 92521, USA.
| | - Stacia Dudley
- Department of Environmental Sciences, University of California, Riverside, CA, 92521, USA
| | - Michelle McGinnis
- Department of Environmental Sciences, University of California, Riverside, CA, 92521, USA
| | - Jay Gan
- Department of Environmental Sciences, University of California, Riverside, CA, 92521, USA
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10
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Ahammed GJ, He BB, Qian XJ, Zhou YH, Shi K, Zhou J, Yu JQ, Xia XJ. 24-Epibrassinolide alleviates organic pollutants-retarded root elongation by promoting redox homeostasis and secondary metabolism in Cucumis sativus L. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2017; 229:922-931. [PMID: 28774551 DOI: 10.1016/j.envpol.2017.07.076] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 06/10/2017] [Accepted: 07/21/2017] [Indexed: 06/07/2023]
Abstract
Environmental pollution by organic pollutants (OPs) has become a global concern due to its detrimental effects on the environment and human health. As plants are used to remediate contaminated sites, understanding the responses of plants to various OPs and fortification of plant tolerance are of great significance. In this work, we studied the biochemical and molecular responses of cucumber plants to three well-known OPs, 2,4,6-trichlorophenol, chlorpyrifos and oxytetracycline in the absence or presence of 24-epibrassinolide (EBR), a potent regulator of plant growth and stress tolerance. The results showed that the selected three OPs retarded root elongation; however, the phytotoxic effects of OPs were attenuated by exogenous EBR. OPs induced accumulations of both hydrogen peroxide (H2O2) and nitric oxide (NO) in root tips and resulted in an increased malondialdehyde (MDA) content, an indicator of membrane lipid peroxidation. Exogenous EBR reduced accumulations of H2O2, NO and MDA in the roots by increasing the expression of antioxidant and detoxification genes and the activities of the corresponding enzymes. Intriguingly, EBR not only promoted the activities of glutathione S-transferase and glutathione reductase, but also increased the content of reduced glutathione without altering the content of oxidized glutathione, which resulted in a reduced redox state under OPs stress. Furthermore, EBR increased the free radical scavenging capacity, flavonoid content and the activity and transcription of secondary metabolism related enzymes. Our results suggest that EBR treatment may fortify secondary metabolism to enhance antioxidant capacity in response to OPs treatment, which might have potential implication in phytoremediation of OPs.
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Affiliation(s)
- Golam Jalal Ahammed
- Department of Horticulture, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China
| | - Bei-Bei He
- Department of Horticulture, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China
| | - Xiang-Jie Qian
- Department of Horticulture, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China
| | - Yan-Hong Zhou
- Department of Horticulture, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China
| | - Kai Shi
- Department of Horticulture, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China
| | - Jie Zhou
- Department of Horticulture, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China
| | - Jing-Quan Yu
- Department of Horticulture, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China; Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology, 866 Yuhangtang Road, Hangzhou 310058, PR China; Key Laboratory of Horticultural Plants Growth, Development and Quality Improvement, Agricultural Ministry of China, Hangzhou 310058, PR China
| | - Xiao-Jian Xia
- Department of Horticulture, Zijingang Campus, Zhejiang University, Hangzhou 310058, PR China.
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