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Zhu S, Zhao W, Sun S, Yang X, Mao H, Sheng L, Chen Z. Community metagenomics reveals the processes of cadmium resistance regulated by microbial functions in soils with Oryza sativa root exudate input. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 949:175015. [PMID: 39069186 DOI: 10.1016/j.scitotenv.2024.175015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 07/21/2024] [Accepted: 07/23/2024] [Indexed: 07/30/2024]
Abstract
Plants exert a profound influence on their rhizosphere microbiome through the secretion of root exudates, thereby imparting critical effects on their growth and overall health. The results unveil that japonica rice showcases a remarkable augmentation in its antioxidative stress mechanisms under Cd stress. This augmentation is characterized by the sequestration of heavy metal ions within the root system and the prodigious secretion of a spectrum of flavonoids, including Quercetin, Luteolin, Apigenin, Kaempferide, and Sakuranetin. These flavonoids operate as formidable guardians, shielding the plant from oxidative damage instigated by Cd-induced stress. Furthermore, the metagenomic analyses divulge the transformative potential of flavonoids, as they induce profound alterations in the composition and structural dynamics of plant rhizosphere microbial communities. These alterations manifest through the recruitment of plant growth-promoting bacteria, effectively engineering a conducive milieu for japonica rice. In addition, our symbiotic network analysis discerns that flavonoid compounds significantly improved the positive correlations among dominant species within the rhizosphere of japonica rice. This, in turn, bolsters the stability and intricacy of the microenvironmental ecological network. KEGG functional analyses reveal a notable upregulation in the expression of flavonoid functional genes, specifically cadA, cznA, nccC, and czrB, alongside an array of transporters, encompassing RND, ABC, MIT, and P-ATPase. These molecular orchestrations distinctly demarcated the rhizosphere microbiome of japonica rice, markedly enhancing its tolerance to Cd-induced stress. These findings not only shed light on the establishment of Cd-resistant bacterial consortia in rice but also herald a promising avenue for the precise modulation of plant rhizosphere microbiomes, thereby fortifying the safety and efficiency of crop production.
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Affiliation(s)
- Sixi Zhu
- College of Eco-environment Engineering, Guizhou Minzu University, The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China.
| | - Wei Zhao
- College of Eco-environment Engineering, Guizhou Minzu University, The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China
| | - Suxia Sun
- College of Eco-environment Engineering, Guizhou Minzu University, The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China
| | - Xiuqin Yang
- College of Eco-environment Engineering, Guizhou Minzu University, The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China
| | - Huan Mao
- College of Eco-environment Engineering, Guizhou Minzu University, The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China
| | - Luying Sheng
- College of Eco-environment Engineering, Guizhou Minzu University, The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China
| | - Zhongbing Chen
- Department of Applied Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcka 129, Praha-Suchdol 16500, Czech Republic
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Zhu S, Sun S, Zhao W, Yang X, Chen Z, Mao H, Sheng L. Comprehensive physiology and proteomics analysis revealed the resistance mechanism of rice (Oryza sativa L) to cadmium stress. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 278:116413. [PMID: 38728942 DOI: 10.1016/j.ecoenv.2024.116413] [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: 03/16/2024] [Revised: 04/25/2024] [Accepted: 04/27/2024] [Indexed: 05/12/2024]
Abstract
Cadmium contamination can lead to a decrease in crop yield and quality. However, Cd-tolerant rice can improve rice resistance genes, improve crop tolerance to heavy metals, and protect plants from oxidative damage. In this study, Japonica rice: Chunyou 987 and Indica rice: Chuanzhong you 3607 were used to reveal the molecular response mechanism of Cd-tolerant rice under cadmium concentration of 3 mg/kg through comparative experiments combined with physiology and proteomics. The results showed that compared with indica rice, japonica rice showed more robust resistance to Cd stress and effectively retained many Cd ions in roots. Moreover, it enhanced its enzymatic and non-enzymatic anti-oxidative stress mechanism, which increased the activities of catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD) by 47.37%, 21.75%, and 55.42%, respectively. The contents of non-enzymatic antioxidant substances ascorbic acid (AsA), glutathione (GSH), cysteine (Cys), proline (PRO), anthocyanins (OPC), and flavonoids were increased by 25.32%, 42.67%, 21.43%, 50.81%, 33.23%, and 72.16%, respectively. Through proteomics analysis, it was found that in response to the damage caused by cadmium stress, Japonica rice makes Photosynthesis functional proteins (psbO and PetH), Photosynthesis antenna proteins (LHCA and ASCAB9), Carbon fixation functional proteins (PEPC and OsAld), Porphyrin metabolism functional proteins (OsRCCR1 and SE5), Glyoxylate and dicarboxylate The expression of metabolism functional proteins (CATC and GLO4.) and Glutathione metabolism functional proteins (APX8 and OsGSTU13) were significantly up-regulated, which stimulated the antioxidant stress mechanism and photosynthetic system, and constructed a robust energy supply system to ensure the normal metabolic activities of life. Strengthening the mechanisms of plant homeostasis. In summary, this study revealed the molecular mechanism of tolerance to Cd stress in japonica rice, and the results of this study will provide a possible way to improve Cd-resistant rice seedlings.
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Affiliation(s)
- Sixi Zhu
- College of Eco-environment Engineering, Guizhou Minzu University; The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China.
| | - Suxia Sun
- College of Eco-environment Engineering, Guizhou Minzu University; The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China
| | - Wei Zhao
- College of Eco-environment Engineering, Guizhou Minzu University; The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China
| | - Xiuqin Yang
- College of Eco-environment Engineering, Guizhou Minzu University; The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China
| | - Zhongbing Chen
- Department of Applied Ecology, Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcka 129, Praha-Suchdol 16500, Czech Republic
| | - Huan Mao
- College of Eco-environment Engineering, Guizhou Minzu University; The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China
| | - Luying Sheng
- College of Eco-environment Engineering, Guizhou Minzu University; The Karst Environmental Geological Hazard Prevention of Key Laboratory of State Ethnic Affairs Commission, Guiyang 550025, China
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Liu M, He X, Zhuo R, Mu J, Zhang D. Functional characterization of a DNA-damage repair/tolerance 100 (DRT100) gene in Sedum alfredii Hance for genome stability maintenance and Cd hypertolerance. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 327:121546. [PMID: 37019266 DOI: 10.1016/j.envpol.2023.121546] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 03/13/2023] [Accepted: 03/31/2023] [Indexed: 06/19/2023]
Abstract
Cd contamination is a world-wild concern for its toxicity and accumulation in food chain. Sedum alfredii Hance (Crassulaceae) is a zinc (Zn) and cadmium (Cd) hyperaccumulator native to China and widely applied for the phytoremediation at Zn or Cd contaminated sites. Although many studies report the uptake, translocation and storage of Cd in S. alfredii Hance, limited information is known about the genes and underlying mechanisms of genome stability maintenance under Cd stress. In this study, a gene resembling DNA-damage repair/toleration 100 (DRT100) was Cd inducible and designated as SaDRT100. Heterologous expression of SaDRT100 gene in yeasts and Arabidopsis thaliana enhanced Cd tolerance capability. Under Cd stress, transgenic Arabidopsis with SaDRT100 gene exhibited lower levels of reactive oxygen species (ROS), fewer Cd uptake in roots and less Cd-induced DNA damage. Evidenced by the subcellular location in cellular nucleus and expression in aerial parts, we suggested the involvement of SaDRT100 in combating Cd-induced DNA damage. Our findings firstly uncovered the roles of SaDRT100 gene in Cd hypertolerance and genome stability maintenance in S. alfredii Hance. The potential functions of DNA protection make SaDRT100 gene a candidate in genetic engineering for phytoremediation at multi-component contaminated sites.
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Affiliation(s)
- Mingying Liu
- School of Basic Medical Sciences, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Xuelian He
- Fungal Research Center, Shaanxi Institute of Microbiology, Xi'an, 710043, Shaanxi, China
| | - Renying Zhuo
- State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing, 100091, China; The Research Institute of Subtropical of Forestry, Chinese Academy of Forestry, Hangzhou, 311400, China
| | - Ju Mu
- School of Basic Medical Sciences, Zhejiang Chinese Medical University, Hangzhou, 310053, China
| | - Dayi Zhang
- Key Laboratory of Groundwater Resources and Environment (Jilin University), Ministry of Education, Changchun, 130021, China; College of New Energy and Environment, Jilin University, Changchun, 130021, China.
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Han M, Ullah H, Yang H, Yu G, You S, Liu J, Chen B, Shahab A, Antoniadis V, Shaheen SM, Rinklebe J. Cadmium uptake and membrane transport in roots of hyperaccumulator Amaranthus hypochondriacus L. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023:121846. [PMID: 37211225 DOI: 10.1016/j.envpol.2023.121846] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 03/26/2023] [Accepted: 04/28/2023] [Indexed: 05/23/2023]
Abstract
Hyperaccumulator Amaranthus hypochondriacus L. has huge potential in the remediation of cadmium (Cd)-contaminated soils and is necessary to understand the mechanism of Cd uptake by the roots. In this study, the mechanism of Cd uptake into the root of A. hypochondriacus was investigated using the non-invasive micro-test technology (NMT) by analyzing the rate of Cd2+ fluxes at different regions of the root tip; also we assessed the impact of different channel blockers and inhibitors on the Cd accumulation in the roots, the real-time Cd2+ fluxes, and the distribution of Cd along the roots. The results showed that the Cd2+ influx was greater near the root tip (within 100 μm of the tip). All the inhibitors, ion-channel blockers, and metal cations had different degrees of inhibition on the absorption of Cd in the roots of A. hypochondriacus. The net Cd2+ flux in the roots was significantly decreased by the Ca2+ channel blockers lanthanum chloride (LaCl3) by up to 96% and verapamil by up to 93%; as for the K+ channel blocker tetraethylammonium (TEA), it also caused a 68%-reduction on the net Cd2+ flux in the roots. Therefore, we infer that the uptake by A. hypochondriacus roots is mainly through the Ca2+ channels. The Cd absorption mechanism appears to be related to the synthesis of plasma membrane P-type ATPase and phytochelatin (PC), which is reflected by the inhibition of Ca2+ upon addition of inorganic metal cations. In conclusion, access of Cd ions into the roots of A. hypochondriacus is achieved through various ion channels, with the most important being the Ca2+ channel. This study will further enhance the literature regarding Cd uptake and pathways of membrane transport in roots of Cd hyperaccumulators.
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Affiliation(s)
- Mengxuan Han
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China.
| | - Habib Ullah
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang, China.
| | - Huan Yang
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China.
| | - Guo Yu
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China.
| | - Shaohong You
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China.
| | - Jie Liu
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China.
| | - Baoliang Chen
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang, China
| | - Asfandyar Shahab
- College of Environmental Science and Engineering, Guilin University of Technology, Guilin, China.
| | - Vasileios Antoniadis
- Department of Agriculture Crop Production and Rural Environment, University of Thessaly, Greece.
| | - Sabry M Shaheen
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraße 7, Wuppertal, Germany.
| | - Jörg Rinklebe
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraße 7, Wuppertal, Germany.
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Wang S, Dai H, Ji D, Cui S, Jiang C, Skuza L, Li L, Grzebelus D, Wei S. Influencing Factors of Bidens pilosa L. Hyperaccumulating Cadmium Explored by the Real-Time Uptake of Cd 2+ Influx around Root Apexes under Different Exogenous Nutrient Ion Levels. TOXICS 2023; 11:227. [PMID: 36976992 PMCID: PMC10054121 DOI: 10.3390/toxics11030227] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 02/22/2023] [Accepted: 02/23/2023] [Indexed: 06/18/2023]
Abstract
Though Bidens pilosa L. has been confirmed to be a potential Cd hyperaccumulator, the accumulation mechanism is not yet clear. The dynamic and real-time uptake of Cd2+ influx by B. pilosa root apexes was determined using non-invasive micro-test technology (NMT), which partly explored the influencing factors of the Cd hyperaccumulation mechanism under the conditions of different exogenous nutrient ions. The results indicated that Cd2+ influxes at 300 μm around the root tips decreased under Cd treatments with 16 mM Ca2+, 8 mM Mg2+, 0.5 mM Fe2+, 8 mM SO42- or 18 mM K+ compared to single Cd treatments. The Cd treatments with a high concentration of nutrient ions showed an antagonistic effect on Cd2+ uptake. However, Cd treatments with 1 mM Ca2+, 0.5 mM Mg2+, 0.5 mM SO42- or 2 mM K+ had no effect on the Cd2+ influxes as compared with single Cd treatments. It is worth noting that the Cd treatment with 0.05 mM Fe2+ markedly increased Cd2+ influxes. The addition of 0.05 mM Fe2+ exhibited a synergistic effect on Cd uptake, which could be low concentration Fe2+ rarely involved in blocking Cd2+ influx and often forming an oxide membrane on the root surface to help the Cd uptake by B. pilosa. The results also showed that Cd treatments with high concentration of nutrient ions significantly increased the concentrations of chlorophyll and carotenoid in leaves and the root vigor of B. pilosa relative to single Cd treatments. Our research provides novel perspectives with respect to Cd uptake dynamic characteristics by B. pilosa roots under different exogenous nutrient ion levels, and shows that the addition of 0.05 mM Fe2+ could promote the phytoremediation efficiency for B. pilosa.
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Affiliation(s)
- Siqi Wang
- Academy of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China
| | - Huiping Dai
- Shaanxi Province Key Laboratory of Bio-Resources, Qinling-Bashan Mountains Bioresources Comprehensive Development C.I.C, State Key Laboratory of Biological Resources and Ecological Environment Jointly Built by Qinba Province and Ministry, College of Biological Science & Engineering, Shaanxi University of Technology, Hanzhong 723001, China
| | - Dandan Ji
- Key Laboratory of Pollution Ecology and Environment Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
| | - Shuang Cui
- Academy of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China
| | - Chengzhi Jiang
- Academy of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, China
| | - Lidia Skuza
- Centre for Molecular Biology and Biotechnology, Institute of Biology, University of Szczecin, 71-415 Szczecin, Poland
| | - Lianzhen Li
- College of Environmental Sciences and Engineering, Qingdao University, Qingdao 266071, China
| | - Dariusz Grzebelus
- Department of Plant Biology and Biotechnology, Faculty of Biotechnology and Horticulture, University of Agriculture in Krakow, 31-120 Krakow, Poland
| | - Shuhe Wei
- Key Laboratory of Pollution Ecology and Environment Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
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Han M, Yang H, Yu G, Jiang P, You S, Zhang L, Lin H, Liu J, Shu Y. Application of Non-invasive Micro-test Technology (NMT) in environmental fields: A comprehensive review. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 240:113706. [PMID: 35659702 DOI: 10.1016/j.ecoenv.2022.113706] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Revised: 05/22/2022] [Accepted: 05/24/2022] [Indexed: 06/15/2023]
Abstract
Non-invasive Micro-test Technology (NMT) is a selective microelectrode technique which can detect the flux rates and three-dimensional motion directions of ions or molecules into and out of living organisms in situ without damaging the sample. It has the advantages of maintaining sample integrity, high temporal and spatial resolution, and being able to measure multiple sites simultaneously. In this paper we provide a comprehensive review on the development of NMT in recent years. Its principles, characteristics, and the differences with other microelectrode techniques are introduced. We discuss the applications of NMT in the field of phytoremediation, plant resistance, water quality monitoring, and toxicity mechanisms of heavy metals on organisms. Furthermore, the challenges and future prospects of NMT in the environmental field are presented.
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Affiliation(s)
- Mengxuan Han
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
| | - Huan Yang
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
| | - Guo Yu
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China.
| | - Pingping Jiang
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
| | - Shaohong You
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China; Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Karst Area, MNR, Guilin, China.
| | - Lei Zhang
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Canada
| | - Hua Lin
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
| | - Jie Liu
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China; Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Karst Area, MNR, Guilin, China
| | - Yi Shu
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, China
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Jiang P, Zheng Y, Liu J, Yu G, Lin F. Pathways of cadmium fluxes in the root of the hyperaccumulator Celosia argentea Linn. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:44413-44421. [PMID: 35137315 DOI: 10.1007/s11356-021-17352-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 10/30/2021] [Indexed: 06/14/2023]
Abstract
In order to study the mechanism of cadmium (Cd) uptake by the roots of Celosia argentea Linn. (Amaranthaceae), the effects of various inhibitors, ion channel blockers, and hydroponic conditions on Cd2+ fluxes in the roots were characterized using non-invasive micro-test technology (NMT). The net Cd2+ flux (72.5 pmol∙cm-2∙s-1) in roots that had been pretreated with Mn was significantly higher than that in non-pretreated roots (58.1 pmol∙cm-2∙s-1), indicating that Mn pretreatment enhanced Cd uptake by the roots. This finding may be explained by the fact that the addition of Mn significantly increased the expression of the transporter gene and thus promoted Cd uptake and transport. In addition, Mn pretreatment resulted in an increase in root growth, which may in turn promote root vigor. The uncoupler 2,4-dinitrophenol (DNP) caused a significant reduction in net Cd2+ fluxes in the roots, by 70.5% and 41.4% when exposed to Mn and Cd stress, respectively. In contrast, a P-type ATPase inhibitor (Na3VO4) had only a small effect on net Cd2+ fluxes to the plant roots, indicating that ATP has a relatively minor role in Cd uptake by roots. La3+ (a Ca channel inhibitor) had a more significant inhibitory effect on net Cd2+ fluxes than did TEA (a K channel inhibitor). Therefore, Cd uptake by plant roots may occur mainly through Ca channels rather than K channels. In summary, uptake of Cd by the roots of C. argentea appears to occur via several types of ion channels, and Mn can promote Cd uptake.
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Affiliation(s)
- Pingping Jiang
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, 541004, China
- Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Karst Area, MNR, Guilin, 541004, China
| | - Yingyi Zheng
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, 541004, China
| | - Jie Liu
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, 541004, China.
- Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Karst Area, MNR, Guilin, 541004, China.
| | - Guo Yu
- Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin, 541004, China
| | - Fanyu Lin
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, China
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8
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Chot E, Reddy MS. Role of Ectomycorrhizal Symbiosis Behind the Host Plants Ameliorated Tolerance Against Heavy Metal Stress. Front Microbiol 2022; 13:855473. [PMID: 35418968 PMCID: PMC8996229 DOI: 10.3389/fmicb.2022.855473] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Accepted: 02/15/2022] [Indexed: 12/05/2022] Open
Abstract
Soil heavy metal (HM) pollution, which arises from natural and anthropogenic sources, is a prime threat to the environment due to its accumulative property and non-biodegradability. Ectomycorrhizal (ECM) symbiosis is highly efficient in conferring enhanced metal tolerance to their host plants, enabling their regeneration on metal-contaminated lands for bioremediation programs. Numerous reports are available regarding ECM fungal potential to colonize metal-contaminated lands and various defense mechanisms of ECM fungi and plants against HM stress separately. To utilize ECM–plant symbiosis successfully for bioremediation of metal-contaminated lands, understanding the fundamental regulatory mechanisms through which ECM symbiosis develops an enhanced metal tolerance in their host plants has prime importance. As this field is highly understudied, the present review emphasizes how plant’s various defense systems and their nutrient dynamics with soil are affected by ECM fungal symbiosis under metal stress, ultimately leading to their host plants ameliorated tolerance and growth. Overall, we conclude that ECM symbiosis improves the plant growth and tolerance against metal stress by (i) preventing their roots direct exposure to toxic soil HMs, (ii) improving plant antioxidant activity and intracellular metal sequestration potential, and (iii) altering plant nutrient uptake from the soil in such a way to enhance their tolerance against metal stress. In some cases, ECM symbiosis promotes HM accumulation in metal stressed plants simultaneous to improved growth under the HM dilution effect.
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Affiliation(s)
- Eetika Chot
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, India
| | - Mondem Sudhakara Reddy
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Patiala, India
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Ectomycorrhizal Fungal Strains Facilitate Cd 2+ Enrichment in a Woody Hyperaccumulator under Co-Existing Stress of Cadmium and Salt. Int J Mol Sci 2021; 22:ijms222111651. [PMID: 34769083 PMCID: PMC8583747 DOI: 10.3390/ijms222111651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 10/23/2021] [Accepted: 10/26/2021] [Indexed: 11/16/2022] Open
Abstract
Cadmium (Cd2+) pollution occurring in salt-affected soils has become an increasing environmental concern in the world. Fast-growing poplars have been widely utilized for phytoremediation of soil contaminating heavy metals (HMs). However, the woody Cd2+-hyperaccumulator, Populus × canescens, is relatively salt-sensitive and therefore cannot be directly used to remediate HMs from salt-affected soils. The aim of the present study was to testify whether colonization of P. × canescens with ectomycorrhizal (EM) fungi, a strategy known to enhance salt tolerance, provides an opportunity for affordable remediation of Cd2+-polluted saline soils. Ectomycorrhization with Paxillus involutus strains facilitated Cd2+ enrichment in P. × canescens upon CdCl2 exposures (50 μM, 30 min to 24 h). The fungus-stimulated Cd2+ in roots was significantly restricted by inhibitors of plasmalemma H+-ATPases and Ca2+-permeable channels (CaPCs), but stimulated by an activator of plasmalemma H+-ATPases. NaCl (100 mM) lowered the transient and steady-state Cd2+ influx in roots and fungal mycelia. Noteworthy, P. involutus colonization partly reverted the salt suppression of Cd2+ uptake in poplar roots. EM fungus colonization upregulated transcription of plasmalemma H+-ATPases (PcHA4, 8, 11) and annexins (PcANN1, 2, 4), which might mediate Cd2+ conductance through CaPCs. EM roots retained relatively highly expressed PcHAs and PcANNs, thus facilitating Cd2+ enrichment under co-occurring stress of cadmium and salinity. We conclude that ectomycorrhization of woody hyperaccumulator species such as poplar could improve phytoremediation of Cd2+ in salt-affected areas.
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Zhang Y, Chao J, Li X, Zhang C, Khan R, Du S, Xu N, Song L, Liu H, Shi Y. Comparative transcriptome combined with biochemical and physiological analyses provide new insights toward cadmium accumulation with two contrasting Nicotiana species. PHYSIOLOGIA PLANTARUM 2021; 173:369-383. [PMID: 33880749 DOI: 10.1111/ppl.13431] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 03/06/2021] [Accepted: 04/14/2021] [Indexed: 06/12/2023]
Abstract
Cadmium (Cd) is known as one of the most hazardous elements in the environment and a persistent soil constraint toxic to all flora and fauna. In this study, we conducted physiological, biochemical, and transcriptomic analyses of Nicotiana rustica (N. rustica) and Nicotiana tabacum (N. tabacum) treated with CdCl2 to know the underlying molecular mechanisms of Cd accumulation. As a result, N. rustica had more dry weight than N. tabacum. Additionally, N. rustica accumulated higher Cd concentration (69.65 times), Cd2+ influx (1.32-fold), glutathione S-transferases (GST) enzyme activity (2.54 times), GSH/GSSG (oxidized form of GSH) ratio, increase of superoxide dismutase and CAT and a lower H2 O2 and superoxide (O2 •- ) accumulation in their roots than N. tabacum. Cd mainly distributed in the cytoplasm of both species and N. rustica had a significant proportion in the cell wall. Furthermore, the transcriptomic analysis revealed 173 and 710 differentially expressed genes (DEGs) between control and Cd-stressed plants in the leaves and roots of N. rustica, while 576 and 1543 DEGs were found in the leaves and roots of N. tabacum, respectively. In N. rustica, phenylpropanoid biosynthesis and phenylalanine metabolism were the most enriched pathways, while GSH metabolism, ATP-binding cassette transporters and phenylpropanoid biosynthesis were the most enriched in N. tabacum. Finally, we found that DEGs related to metal influx, sequestration, remobilization, and chelation were responsible for Cd accumulation. These results indicated that N. rustica accumulated higher Cd content than N. tabacum, suggesting that each species utilized different response mechanism under the same Cd stress conditions. The DEGs identified in this study might lead to the identification of genes or pathways related to Cd regulation. This study identifies important regulators related to Cd accumulation.
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Affiliation(s)
- Yan Zhang
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture and Rural Affairs, Qingdao, China
- Graduate School of Chinese Academy of Agricultural Science, Beijing, China
| | - Jiangtao Chao
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture and Rural Affairs, Qingdao, China
- Graduate School of Chinese Academy of Agricultural Science, Beijing, China
| | - Xiuchun Li
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture and Rural Affairs, Qingdao, China
- Graduate School of Chinese Academy of Agricultural Science, Beijing, China
| | - Chong Zhang
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao, China
| | - Rayyan Khan
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture and Rural Affairs, Qingdao, China
| | - Shasha Du
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture and Rural Affairs, Qingdao, China
| | - Na Xu
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture and Rural Affairs, Qingdao, China
| | - Lin Song
- Shandong Provincial Key Laboratory of Biochemical Engineering, College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao, China
| | - Haiwei Liu
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture and Rural Affairs, Qingdao, China
| | - Yi Shi
- Tobacco Research Institute, Chinese Academy of Agricultural Sciences, Key Laboratory of Tobacco Biology and Processing, Ministry of Agriculture and Rural Affairs, Qingdao, China
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11
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Zhang D, Dong F, Zhang Y, Huang Y, Zhang C. Mechanisms of low cadmium accumulation in storage root of sweetpotato (Ipomoea batatas L.). JOURNAL OF PLANT PHYSIOLOGY 2020; 254:153262. [PMID: 33027727 DOI: 10.1016/j.jplph.2020.153262] [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: 03/26/2020] [Revised: 07/30/2020] [Accepted: 07/31/2020] [Indexed: 06/11/2023]
Abstract
Sweetpotato (Ipomoea batatas L.) possess great application prospects due to their low cadmium (Cd) concentration within their storage roots despite growth on Cd-polluted fields. The mechanisms of low Cd accumulation in storage root is not entirely clear. We found that the blocking effect of Cd uptake in the root absorption system and the characteristics of Cd distribution in storage root play a decisive role in the regulation of low Cd accumulation in storage root. Cd absorbed from the rhizosphere mainly accumulated in feeder roots in Cd dose-dependent accumulation analyses. Meanwhile, we found that Cd absorbed by the peels of storage root was mainly transported from peels to shoots, rather than directly into the fleshed storage root. Further analysis indicated that Cd uptake, transport, and distribution in sweetpotato hinges on whether Cd enters the plant plasma membrane by either the symplast or apoplast pathway. The Cd concentration in feeder root decreased after respiratory inhibitors CCCP and DNP treatment and increased after the culture temperature was raised from 28 ℃ to 35 ℃. Non-invasive microelectrode Cd flux measurements further revealed that Cd uptake in feeder root was affected greatly by the Cd concentration of the solution and was markedly reduced by respiratory inhibitor CCCP. Relative to the elongation zone and mature zone, the meristematic zone was the main site of Cd uptake in the root absorption system. This study suggests that inhibition of Cd uptake by the root absorption system and the characteristics of Cd distribution in storage root are the main reasons for low cadmium accumulation in storage root.
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Affiliation(s)
- Daowei Zhang
- Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha, Hunan Province, 410125 China.
| | - Fang Dong
- Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha, Hunan Province, 410125 China.
| | - Ya Zhang
- Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha, Hunan Province, 410125 China.
| | - Yanlan Huang
- Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha, Hunan Province, 410125 China.
| | - Chaofan Zhang
- Crop Research Institute, Hunan Academy of Agricultural Sciences, Changsha, Hunan Province, 410125 China.
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12
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Lan XY, He QS, Yang B, Yan YY, Li XY, Xu FL. Influence of Cd exposure on H + and Cd 2+ fluxes in the leaf, stem and root of a novel aquatic hyperaccumulator - Microsorum pteropus. CHEMOSPHERE 2020; 249:126552. [PMID: 32217414 DOI: 10.1016/j.chemosphere.2020.126552] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 03/10/2020] [Accepted: 03/17/2020] [Indexed: 06/10/2023]
Abstract
Microsorum pteropus has been proven to be a potential novel aquatic Cd hyperaccumulator. In this study, Non-invasive Micro-test Technology (NMT) was used to observe the ion fluxes of different M. pteropus tissues under Cd exposure. M. pteropus can hyperaccumulate more than 1000 mg/kg Cd in roots and leaves and approximately 600 mg/kg Cd in stems after seven days of exposure to 500 μM Cd, showing that this plant have a great capacity for Cd enrichment and resistance. The NMT test found H+ fluxes increased in all tissues after Cd exposure, with the largest increases being observed in stems, followed by the leaves and roots. Cd2+ fluxes showed different accumulation levels in different tissues, with low-level Cd exposure leading to influxes into roots and leaves, and high-level Cd exposure resulting in effluxes from roots. No significant influxes or effluxes were observed in leaves under high-level Cd exposure, or in stems under low- and high-levels of Cd exposure. However, transient high-level Cd exposure showed long-term Cd2+ influxes into roots and short-term Cd2+ effluxes out of stems and leaves. The roots of M. pteropus had greater regulation mechanisms for Cd enrichment and resistance, with influxes occurring following low-level exposure and effluxes occurring from high-level exposure. When exposed to Cd, M. pteropus stems showed less transportation and absorption. Low-level Cd exposure resulted in individual leaves directly absorbing Cd from hydroponic solutions. Different Cd enrichment and resistance mechanisms were exhibited by different M. pteropus tissues.
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Affiliation(s)
- Xin-Yu Lan
- MOE Laboratory for Earth Surface Processes, College of Urban & Environmental Sciences, Peking University, Beijing, 100871, China
| | - Qi-Shuang He
- MOE Laboratory for Earth Surface Processes, College of Urban & Environmental Sciences, Peking University, Beijing, 100871, China; Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Bin Yang
- MOE Laboratory for Earth Surface Processes, College of Urban & Environmental Sciences, Peking University, Beijing, 100871, China
| | - Yun-Yun Yan
- MOE Laboratory for Earth Surface Processes, College of Urban & Environmental Sciences, Peking University, Beijing, 100871, China
| | - Xin-Yuan Li
- MOE Laboratory for Earth Surface Processes, College of Urban & Environmental Sciences, Peking University, Beijing, 100871, China
| | - Fu-Liu Xu
- MOE Laboratory for Earth Surface Processes, College of Urban & Environmental Sciences, Peking University, Beijing, 100871, China.
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13
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Tao Q, Liu Y, Li M, Li J, Luo J, Lux A, Kováč J, Yuan S, Li B, Li Q, Li H, Li T, Wang C. Cd-induced difference in root characteristics along root apex contributes to variation in Cd uptake and accumulation between two contrasting ecotypes of Sedum alfredii. CHEMOSPHERE 2020; 243:125290. [PMID: 31759213 DOI: 10.1016/j.chemosphere.2019.125290] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Revised: 10/19/2019] [Accepted: 11/01/2019] [Indexed: 06/10/2023]
Abstract
The root apex is the most active part for water and ions uptake, however, longitudinal alterations in root characteristics along root apex and consequences for metal uptake in hyperaccumulator are poorly understood. Here, we compared cadmium (Cd)-induced longitudinal alterations in root apex of two ecotypes of Sedum alfredii and assess their effects on Cd uptake. Under Cd treatment, cell death began from epidermis to the stele in non-hyperaccumulating ecotype (NHE) over time, and the number of dead cells was significantly higher than that in hyperaccumulating ecotype (HE). Cd-induced the presence of border-like cells (BLCs) surrounding the root tip of NHE prevented Cd from entering roots, however, almost no BLCs were observed in the root tip of in HE. Besides, Cd-treated NHE exhibited 76% and 52% decrease in the proportions of meristematic and elongation zone, respectively, resulting in lower Cd influx and less intensive Cd-fluorescence in these zones, as compared with HE. In the differentiation zone, Cd induced earlier initiation of root hairs (RHs), lower RHs-density, shorter RHs-length, thicker RHs-radius and less trichoblasts in NHE than those in HE. These remarkable variations led to less Cd influx and lower intensity of Cd-fluorescence in RHs of NHE than those of HE. Furthermore, decline in cell wall thickness under Cd exposure resulted in less cell-wall-bond Cd in the cell wall of HE. Therefore, Cd-induced alterations in root characteristics alongside root apex contributed to the difference in Cd uptake and accumulation between two ecotypes of S. alfredii.
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Affiliation(s)
- Qi Tao
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, China
| | - Yuankun Liu
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Meng Li
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, China
| | - Jinxing Li
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Jipeng Luo
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Alexander Lux
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina B2, 842 15, Bratislava, Slovakia
| | - Ján Kováč
- Department of Plant Physiology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina B2, 842 15, Bratislava, Slovakia
| | - Shu Yuan
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, China
| | - Bing Li
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, China
| | - Qiquan Li
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, China
| | - Huanxiu Li
- College of Horticulture, Sichuan Agricultural University, Chengdu, 611130, China
| | - Tingqiang Li
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China.
| | - Changquan Wang
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, China.
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Sa G, Yao J, Deng C, Liu J, Zhang Y, Zhu Z, Zhang Y, Ma X, Zhao R, Lin S, Lu C, Polle A, Chen S. Amelioration of nitrate uptake under salt stress by ectomycorrhiza with and without a Hartig net. THE NEW PHYTOLOGIST 2019; 222:1951-1964. [PMID: 30756398 PMCID: PMC6594093 DOI: 10.1111/nph.15740] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 02/01/2019] [Indexed: 05/13/2023]
Abstract
Salt stress is an important environmental cue impeding poplar nitrogen nutrition. Here, we characterized the impact of salinity on proton-driven nitrate fluxes in ectomycorrhizal roots and the importance of a Hartig net for nitrate uptake. We employed two Paxillus involutus strains for root colonization: MAJ, which forms typical ectomycorrhizal structures (mantle and Hartig net), and NAU, colonizing roots with a thin, loose hyphal sheath. Fungus-colonized and noncolonized Populus × canescens were exposed to sodium chloride and used to measure root surface pH, nitrate (NO3- ) flux and transcription of NO3- transporters (NRTs; PcNRT1.1, -1.2, -2.1), and plasmalemma proton ATPases (HAs; PcHA4, -8, -11). Paxillus colonization enhanced root NO3- uptake, decreased surface pH, and stimulated NRTs and HA4 of the host regardless the presence or absence of a Hartig net. Under salt stress, noncolonized roots exhibited strong net NO3- efflux, whereas beneficial effects of fungal colonization on surface pH and HAs prevented NO3- loss. Inhibition of HAs abolished NO3- influx under all conditions. We found that stimulation of HAs was crucial for the beneficial influence of ectomycorrhiza on NO3- uptake, whereas the presence of a Hartig net was not required for improved NO3- translocation. Mycorrhizas may contribute to host adaptation to salt-affected environments by keeping up NO3- nutrition.
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Affiliation(s)
- Gang Sa
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
- Gansu Provincial Key Laboratory of Aridland Crop SciencesGansu Agricultural UniversityLanzhou730070China
| | - Jun Yao
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
| | - Chen Deng
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
| | - Jian Liu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
| | - Yinan Zhang
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
| | - Zhimei Zhu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
| | - Yuhong Zhang
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
| | - Xujun Ma
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
- Urat Desert‐Grassland Research StationNorthwest Institute of Eco‐Environment and ResourcesChinese Academy of ScienceLanzhou730000China
| | - Rui Zhao
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
| | - Shanzhi Lin
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
| | - Cunfu Lu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
| | - Andrea Polle
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
- Forest Botany and Tree PhysiologyUniversity of GoettingenGöttingen37077Germany
| | - Shaoliang Chen
- Beijing Advanced Innovation Center for Tree Breeding by Molecular DesignCollege of Biological Sciences and TechnologyBeijing Forestry UniversityBox 162Beijing100083China
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15
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Yue L, Lian F, Han Y, Bao Q, Wang Z, Xing B. The effect of biochar nanoparticles on rice plant growth and the uptake of heavy metals: Implications for agronomic benefits and potential risk. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 656:9-18. [PMID: 30502737 DOI: 10.1016/j.scitotenv.2018.11.364] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 11/23/2018] [Accepted: 11/24/2018] [Indexed: 05/04/2023]
Abstract
The interaction between biochar nanoparticles (nano-BC) and plant roots in the rhizosphere is largely unknown, although it is crucial for understanding the role of BC in plant growth and bioavailability of pollutants. The effect of nano-BC produced at a series of temperatures (300-600 °C) on alleviating the phytotoxicity of Cd2+ to rice plants was investigated from the aspects of biochemical changes and Cd uptake in this study. The kinetics of Cd2+ fluxes in different root zones in the presence of nano-BC were also measured using a scanning ion-selective electrode technique. We found that the high-temperature nano-BC could more significantly alleviate the phytotoxicity of Cd2+ than the low-temperature and bulk BCs as reflected by the higher increased biomass, root vitality, chlorophyll content, and decreased MDA content as well as relative electrical conductivity of rice plants, which is due to the high adsorption affinity of nano-BC for Cd2+. Also, for the first time we demonstrated that nano-BC could differentially affect the net flux of Cd2+ in different zones of the root tips. However, nano-BC (especially that produced at higher temperatures) more significantly increased the contents of antioxidative enzyme activities (e. g., SOD, POD, and CAT) and soluble protein than the treatment only with Cd2+ (5.0 mg/L), indicating that nano-BC could induce oxidative stress in the rice plants. These results indicate that nano-BC could greatly reduce the uptake and phytotoxicity of Cd2+, but its potential risk should not be overlooked during the environmental and agricultural applications of biochar.
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Affiliation(s)
- Le Yue
- Institute of Environmental Processes and Pollution Control, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Fei Lian
- Institute of Environmental Processes and Pollution Control, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China; Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China.
| | - Yang Han
- Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
| | - Qiongli Bao
- Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China
| | - Zhengyu Wang
- Institute of Environmental Processes and Pollution Control, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
| | - Baoshan Xing
- Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA 01003, the, United States
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16
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Chen X, Ouyang Y, Fan Y, Qiu B, Zhang G, Zeng F. The pathway of transmembrane cadmium influx via calcium-permeable channels and its spatial characteristics along rice root. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:5279-5291. [PMID: 30099559 PMCID: PMC6184580 DOI: 10.1093/jxb/ery293] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 08/02/2018] [Indexed: 05/19/2023]
Abstract
To develop elite crops with low cadmium (Cd), a fundamental understanding of the mechanism of Cd uptake by crop roots is necessary. Here, a new mechanism for Cd2+ entry into rice root cells was investigated. The results showed that Cd2+ influx in rice roots exhibited spatially and temporally dynamic patterns. There was a clear longitudinal variation in Cd uptake along rice roots, with the root tip showing much higher Cd2+ influx and concentration than the root mature zone, which might be due to the much higher expression of the well-known Cd transporter genes OsIRT1, OsNRAMP1, OsNRAMP5, and OsZIP1 in the root tip. Both the net Cd2+ influx and the uptake of Cd in rice roots were highly inhibited by ion channel blockers Gd3+ and TEA+, supplementation of Ca2+ and K+, and the plasma membrane H+-ATPase inhibitor vanadate, with Gd3+ and Ca2+ showing the most inhibitory effects. Furthermore, Ca2+- or Gd3+-induced reduction in Cd2+ influx and Cd uptake did not coincide with the expression of Cd transporter genes, but with that of two Ca channel genes, OsAAN4 and OsGLR3.4. These results indicate that Cd transporters are in part responsible for Cd2+ entry into rice root, and provide a new perspective that the Ca channels OsAAN4 and OsGLR3.4 might play an important role in rice root Cd uptake.
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Affiliation(s)
- Xiaohui Chen
- Institute of Crop Science, Zijingang Campus, Zhejiang University, Hangzhou, China
| | - Younan Ouyang
- China National Rice Research Institute, Hangzhou, China
| | - Yicong Fan
- Institute of Crop Science, Zijingang Campus, Zhejiang University, Hangzhou, China
| | - Boyin Qiu
- Key Laboratory of Crop Breeding in South Zhejiang, Wenzhou Academy of Agricultural Science, Wenzhou Vocational College of Science and Technology, Wenzhou, China
| | - Guoping Zhang
- Institute of Crop Science, Zijingang Campus, Zhejiang University, Hangzhou, China
| | - Fanrong Zeng
- Institute of Crop Science, Zijingang Campus, Zhejiang University, Hangzhou, China
- Correspondence:
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17
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Zhang X, Shao J, Chen A, Shang C, Hu X, Luo S, Lei M, Peng L, Zeng Q. Effects of cadmium on calcium homeostasis in the white-rot fungus Phanerochaete chrysosporium. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 157:95-101. [PMID: 29609109 DOI: 10.1016/j.ecoenv.2018.03.071] [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: 10/30/2017] [Revised: 03/23/2018] [Accepted: 03/25/2018] [Indexed: 06/08/2023]
Abstract
Due to the widespread application of white-rot fungi for the treatment of pollutants, it's crucial to exploit the special effects of pollutants on the microbes. Here, we studied the effects of cadmium on calcium homeostasis in the most studied white-rot fungus Phanerochaete chrysosporium. The response of P. chrysosporium to cadmium stress is concentration-dependent. A high concentration of cadmium caused the release of calcium from P. chrysosporium, while a hormesis effect was observed at a lower cadmium concentration (10 μM), which resulted in a significant increase in calcium uptake and reversed the decrease in cell viability. Calcium (50 μM) promoted cell viability (127.2% of control), which reflects that calcium can protect P. chrysosporium from environmental stress. Real-time changes in the Ca2+ and Cd2+ fluxes of P. chrysosporium were quantified using the noninvasive microtest technique. Ca2+ influx decreased significantly under cadmium exposure, and the Ca2+ channel was involved in Ca2+ and Cd2+ influx. The cadmium and/or calcium uptake results coupled with the real-time Ca2+ and Cd2+ influxes microscale signatures can enhance our knowledge of the homeostasis of P. chrysosporium with respect to cadmium stress, which may provide useful information for improving the bioremediation process.
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Affiliation(s)
- Xiaoxiao Zhang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Jihai Shao
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Anwei Chen
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China.
| | - Cui Shang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Xinjiang Hu
- College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, PR China
| | - Si Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Ming Lei
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Liang Peng
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Qingru Zeng
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
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18
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Gong B, Nie W, Yan Y, Gao Z, Shi Q. Unravelling cadmium toxicity and nitric oxide induced tolerance in Cucumis sativus : Insight into regulatory mechanisms using proteomics. JOURNAL OF HAZARDOUS MATERIALS 2017; 336:202-213. [PMID: 0 DOI: 10.1016/j.jhazmat.2017.04.058] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Revised: 04/20/2017] [Accepted: 04/21/2017] [Indexed: 05/08/2023]
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19
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Li LZ, Tu C, Wu LH, Peijnenburg WJGM, Ebbs S, Luo YM. Pathways of root uptake and membrane transport of Cd 2+ in the zinc/cadmium hyperaccumulating plant Sedum plumbizincicola. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2017; 36:1038-1046. [PMID: 27662630 DOI: 10.1002/etc.3625] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 09/05/2016] [Accepted: 09/21/2016] [Indexed: 05/19/2023]
Abstract
Uptake and membrane transport of cadmium (Cd) in roots of the hyperaccumulator Sedum plumbizincicola X.H. Guo et S.B. Zhou ex L.H. Wu was characterized by assessing the impact of various inhibitors and ion channel blockers on Cd accumulation as well as the real-time net Cd2+ flux at the roots with application of the scanning ion-selective electrode technique. The uncouplers 2,4-dinitrophenol and P-type adenosine triphosphatase inhibitor Na3 VO4 significantly limited Cd2+ uptake and transport kinetics in the root of S. plumbizincicola. These findings indicate that Cd is actively taken up into the roots. The Cd content in plant was significantly decreased with pretreatments of the Ca2+ channel blocker La3+ or Gd3+ and the K+ channel blocker tetraethylammonium, as well as in the presence of higher concentration of Ca2+ and K+ . These findings indicated that uptake of Cd2+ into the root of S. plumbizincicola proceeds through ion channels that are permeable to both Ca2+ and K+ as confirmed by the direct evidence of real-time net Cd2+ fluxes at the root surface in the treatments with ion channel inhibitors, as well as in the presence of elevated concentrations of Ca2+ and K+ . In addition, the results suggested a role for phytochelatin and protein synthesis in mediating Cd2+ uptake by S. plumbizincicola. These findings increase the understanding of Cd2+ uptake and membrane transport pathways in roots of the Zn/Cd hyperaccumulator S. plumbizincicola. Environ Toxicol Chem 2017;36:1038-1046. © 2016 SETAC.
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Affiliation(s)
- Lian-Zhen Li
- Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes, Yantai, People's Republic of China
| | - Chen Tu
- Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes, Yantai, People's Republic of China
| | - Long-Hua Wu
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, People's Republic of China
| | - Willie J G M Peijnenburg
- Center for Safety of Products and Substances, National Institute of Public Health and the Environment, Bilthoven, The Netherlands
- Institute of Environmental Sciences (CML), Leiden University, Leiden, The Netherlands
| | - Stephen Ebbs
- Department of Plant Biology, Southern Illinois University Carbondale, Carbondale, Illinois, USA
| | - Yong-Ming Luo
- Key Laboratory of Coastal Zone Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Shandong Provincial Key Laboratory of Coastal Zone Environmental Processes, Yantai, People's Republic of China
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20
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Guo H, Feng X, Hong C, Chen H, Zeng F, Zheng B, Jiang D. Malate secretion from the root system is an important reason for higher resistance of Miscanthus sacchariflorus to cadmium. PHYSIOLOGIA PLANTARUM 2017; 159:340-353. [PMID: 27787914 DOI: 10.1111/ppl.12526] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Revised: 10/05/2016] [Accepted: 10/10/2016] [Indexed: 05/03/2023]
Abstract
Miscanthus is a vigorous perennial Gramineae genus grown throughout the world as a promising bioenergy crop and generally regarded as heavy metal tolerant due to its ability to absorb heavy metals. However, little is known about the mechanism for heavy metal tolerance in Miscanthus. In this study, two Miscanthus species (Miscanthus sacchariflorus and Miscanthus floridulus) exhibiting different cadmium (Cd) sensitivity were used to address the mechanisms of Cd tolerance. Under the same Cd stress, M. sacchariflorus showed higher Cd tolerance with better growth and lower Cd accumulation in both shoots and roots than M. floridulus. The malate (MA) content significantly increased in root exudates of M. sacchariflorus following Cd treatment while it was almost unchanged in M. floridulus. Cellular Cd analysis and flux data showed that exogenous MA application markedly restricted Cd influx and accumulation while an anion-channel inhibitor (phenylglyoxal) effectively blocked Cd-induced MA secretion and increased Cd influx in M. sacchariflorus, indicating that MA secretion could alleviate Cd toxicity by reducing Cd uptake. The genes of malate dehydrogenases (MsMDHs) and Al-activated malate transporter 1 (MsALMT1) in M. sacchariflorus were highly upregulated under Cd stress, compared with that in M. floridulus. The results indicate that Cd-induced MA synthesis and secretion efficiently alleviate Cd toxicity by reducing Cd influx in M. sacchariflorus.
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Affiliation(s)
- Haipeng Guo
- State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xue Feng
- Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Chuntao Hong
- Department of Forestry, Ningbo Academy of Agricultural Sciences, Ningbo, 315040, China
| | - Houming Chen
- State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Fanrong Zeng
- Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, China
| | - Bingsong Zheng
- Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou, 311300, China
| | - Dean Jiang
- State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou, 310058, China
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Zhang Y, Sa G, Zhang Y, Zhu Z, Deng S, Sun J, Li N, Li J, Yao J, Zhao N, Zhao R, Ma X, Polle A, Chen S. Paxillus involutus-Facilitated Cd 2+ Influx through Plasma Membrane Ca 2+-Permeable Channels Is Stimulated by H 2O 2 and H +-ATPase in Ectomycorrhizal Populus × canescens under Cadmium Stress. FRONTIERS IN PLANT SCIENCE 2017; 7:1975. [PMID: 28111579 PMCID: PMC5216326 DOI: 10.3389/fpls.2016.01975] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 12/13/2016] [Indexed: 05/13/2023]
Abstract
Using a Non-invasive Micro-test Technique, flux profiles of Cd2+, Ca2+, and H+ were investigated in axenically grown cultures of two strains of Paxillus involutus (MAJ and NAU), ectomycorrhizae formed by these fungi with the woody Cd2+-hyperaccumulator, Populus × canescens, and non-mycorrhizal (NM) roots. The influx of Cd2+ increased in fungal mycelia, NM and ectomycorrhizal (EM) roots upon a 40-min shock, after short-term (ST, 24 h), or long-term (LT, 7 days) exposure to a hydroponic environment of 50 μM CdCl2. Cd2+ treatments (shock, ST, and LT) decreased Ca2+ influx in NM and EM roots but led to an enhanced influx of Ca2+ in axenically grown EM cultures of the two P. involutus isolates. The susceptibility of Cd2+ flux to typical Ca2+ channel blockers (LaCl3, GdCl3, verapamil, and TEA) in fungal mycelia and poplar roots indicated that the Cd2+ entry occurred mainly through Ca2+-permeable channels in the plasma membrane (PM). Cd2+ treatment resulted in H2O2 production. H2O2 exposure accelerated the entry of Cd2+ and Ca2+ in NM and EM roots. Cd2+ further stimulated H+ pumping activity benefiting NM and EM roots to maintain an acidic environment, which favored the entry of Cd2+ across the PM. A scavenger of reactive oxygen species, DMTU, and an inhibitor of PM H+-ATPase, orthovanadate, decreased Ca2+ and Cd2+ influx in NM and EM roots, suggesting that the entry of Cd2+ through Ca2+-permeable channels is stimulated by H2O2 and H+ pumps. Compared to NM roots, EM roots exhibited higher Cd2+-fluxes under shock, ST, and LT Cd2+ treatments. We conclude that ectomycorrhizal P. × canescens roots retained a pronounced H2O2 production and a high H+-pumping activity, which activated PM Ca2+ channels and thus facilitated a high influx of Cd2+ under Cd2+ stress.
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Affiliation(s)
- Yuhong Zhang
- College of Biological Sciences and Technology, Beijing Forestry UniversityBeijing, China
| | - Gang Sa
- College of Biological Sciences and Technology, Beijing Forestry UniversityBeijing, China
| | - Yinan Zhang
- College of Biological Sciences and Technology, Beijing Forestry UniversityBeijing, China
| | - Zhimei Zhu
- College of Biological Sciences and Technology, Beijing Forestry UniversityBeijing, China
| | - Shurong Deng
- College of Biological Sciences and Technology, Beijing Forestry UniversityBeijing, China
| | - Jian Sun
- College of Life Science, Jiangsu Normal UniversityXuzhou, China
| | - Nianfei Li
- College of Biological Sciences and Technology, Beijing Forestry UniversityBeijing, China
| | - Jing Li
- School of Computer Science and Technology, Henan Polytechnic UniversityJiaozuo, China
| | - Jun Yao
- College of Biological Sciences and Technology, Beijing Forestry UniversityBeijing, China
| | - Nan Zhao
- College of Biological Sciences and Technology, Beijing Forestry UniversityBeijing, China
| | - Rui Zhao
- College of Biological Sciences and Technology, Beijing Forestry UniversityBeijing, China
| | - Xujun Ma
- College of Biological Sciences and Technology, Beijing Forestry UniversityBeijing, China
| | - Andrea Polle
- Büsgen-Institut, Forstbotanik und Baumphysiologie, Georg-August-Universität GöttingenGöttingen, Germany
| | - Shaoliang Chen
- College of Biological Sciences and Technology, Beijing Forestry UniversityBeijing, China
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Guo H, Hong C, Xiao M, Chen X, Chen H, Zheng B, Jiang D. Real-time kinetics of cadmium transport and transcriptomic analysis in low cadmium accumulator Miscanthus sacchariflorus. PLANTA 2016; 244:1289-1302. [PMID: 27534966 DOI: 10.1007/s00425-016-2578-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Accepted: 08/01/2016] [Indexed: 05/03/2023]
Abstract
The molecular mechanism of low Cd influxes and accumulation in Miscanthus sacchariflorus is revealed by RNA sequencing technique. Soil cadmium (Cd) pollution has posed a serious threat to our soil quality and food security as well as to human health. Some wild plants exhibit high tolerance to heavy metals stress. However, mechanisms of Cd tolerance of wild plants remain to be fully clarified. In this study, we found that two Miscanthus species, Miscanthus (M.) sacchariflorus and M. floridulus, showed different Cd-tolerant mechanisms. M. sacchariflorus accumulated less Cd in both root and leaf by limiting Cd uptake from root and showed superior Cd tolerance, while M. floridulus not only absorbs more Cd from root but also transports more Cd to shoot. To investigate the molecular mechanism of different Cd uptake patterns in the two Miscanthus species, we analyzed the transcriptome of M. sacchariflorus and identified transcriptional changes in response to Cd in roots by high-throughput RNA-sequencing technology. A total of 92,985 unigenes were obtained from M. sacchariflorus root cDNA samples. Based on the assembled de novo transcriptome, 681 DEGs which included 345 upregulated and 336 downregulated genes were detected between two libraries of untreated and Cd-treated roots. Gene ontology (GO) and pathway enrichment analysis revealed that upregulated DEGs under Cd stress are predominately involved in metabolic pathway, starch and sucrose and biosynthesis of secondary metabolites and metal ion transporters. Quantitative RT-PCR was employed to compare the expression levels of some metal transport genes in roots of two Miscanthus species, and the genes involved in Cd uptake from root and transfer from root to shoot were extremely different. The results not only enrich genomic resource but also help to better understand the molecular mechanisms of Cd accumulation and tolerance in wild plants.
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Affiliation(s)
- Haipeng Guo
- State Key Laboratory of Plant Physiology and Biochemistry, Zhejiang University, Hangzhou, China
- Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou, China
| | - Chuntao Hong
- Academy of Agricultural Sciences of Ningbo, Ningbo, Zhejiang, China
| | - Mengzhu Xiao
- State Key Laboratory of Plant Physiology and Biochemistry, Zhejiang University, Hangzhou, China
| | - Xiaomin Chen
- Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou, China
| | - Houming Chen
- State Key Laboratory of Plant Physiology and Biochemistry, Zhejiang University, Hangzhou, China
| | - Bingsong Zheng
- Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Hangzhou, China.
| | - Dean Jiang
- State Key Laboratory of Plant Physiology and Biochemistry, Zhejiang University, Hangzhou, China.
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Luo ZB, He J, Polle A, Rennenberg H. Heavy metal accumulation and signal transduction in herbaceous and woody plants: Paving the way for enhancing phytoremediation efficiency. Biotechnol Adv 2016; 34:1131-1148. [DOI: 10.1016/j.biotechadv.2016.07.003] [Citation(s) in RCA: 203] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 05/24/2016] [Accepted: 07/12/2016] [Indexed: 11/26/2022]
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Zhang Z, Yu Q, Du H, Ai W, Yao X, Mendoza-Cózatl DG, Qiu B. Enhanced cadmium efflux and root-to-shoot translocation are conserved in the hyperaccumulatorSedum alfredii(Crassulaceae family). FEBS Lett 2016; 590:1757-64. [DOI: 10.1002/1873-3468.12225] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 05/11/2016] [Accepted: 05/18/2016] [Indexed: 12/11/2022]
Affiliation(s)
- Zhongchun Zhang
- School of Life Sciences; Hubei Key Laboratory of Genetic Regulation and Integrative Biology; Central China Normal University; Wuhan China
| | - Qi Yu
- School of Life Sciences; Hubei Key Laboratory of Genetic Regulation and Integrative Biology; Central China Normal University; Wuhan China
| | - Hanying Du
- School of Life Sciences; Hubei Key Laboratory of Genetic Regulation and Integrative Biology; Central China Normal University; Wuhan China
| | - Wenli Ai
- School of Life Sciences; Hubei Key Laboratory of Genetic Regulation and Integrative Biology; Central China Normal University; Wuhan China
| | - Xuan Yao
- College of Plant Science and Technology; Huazhong Agriculture University; Wuhan China
| | - David G. Mendoza-Cózatl
- Division of Plant Sciences; C.S. Bond Life Sciences Center; University of Missouri; Columbia MO USA
| | - Baosheng Qiu
- School of Life Sciences; Hubei Key Laboratory of Genetic Regulation and Integrative Biology; Central China Normal University; Wuhan China
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Di Baccio D, Castagna A, Tognetti R, Ranieri A, Sebastiani L. Early responses to cadmium of two poplar clones that differ in stress tolerance. JOURNAL OF PLANT PHYSIOLOGY 2014; 171:1693-1705. [PMID: 25213704 DOI: 10.1016/j.jplph.2014.08.007] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/04/2014] [Revised: 07/25/2014] [Accepted: 08/14/2014] [Indexed: 06/03/2023]
Abstract
Soil cadmium (Cd) contamination is becoming a matter of great global concern. The identification of plants differentially sensitive to Cd excess is of interest for the selection of genotype adaptive to grow and develop in polluted areas and capable of ameliorating or reducing the negative environmental effects of this toxic metal. The two poplar clones I-214 (Populus×canadensis) and Eridano (Populus deltoides×maximowiczii) are, respectively, tolerant and sensitive to ozone (O3) exposure. Because stress tolerance is mediated by an array of overlapping defence mechanisms, we tested the hypothesis that these two clones differently sensitive to O3 stress factor also exhibit different tolerance to Cd. With this purpose, an outdoor pot experiment was designed to study the responses of I-214 and Eridano to the distribution of different Cd solutions enriched with CdCl2 (0, 50 and 150μM) for 35 days. Changes in leaf area, biomass allocation and Cd uptake, photosynthesis, chlorophyll fluorescence, leaf concentration of nutrients and pigments, hydrogen peroxide (H2O2) and nitric oxide (NO) production and thiol compounds were investigated. The two poplar clones showed similar sensitivity to excess Cd in terms of biomass production, photosynthesis activity and Cd accumulation, though physiological and biochemical traits revealed different defence strategies. In particular, Eridano maintained in any Cd treatment the number of its constitutively wider blade leaves, while the number of I-214 leaves (with lower size) was reduced. H2O2 increased 4.5- and 13-fold in I-214 leaves after the lowest (L) and highest (H) Cd treatments, respectively, revealing the induction of oxidative burst. NO, constitutively higher in I-214 than Eridano, progressively increased in both clones with the enhancement of Cd concentration in the substrate. I-214 showed a more elevated antioxidative capacity (GSH/GSSG) and higher photochemical efficiency of PSII (Fv/Fm) and de-epoxidation degree of xantophylls-cycle (DEPS). The glutathione pool was not affected by Cd treatment in both clones, while non-protein thiols and phytochelatins were reduced at L Cd treatment in I-214. Overall, these two clones presented high adaptability to Cd stress and are both suitable to develop and growth in environments contaminated with this metal, thus being promising for their potential use in phytoremediation programmes.
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Affiliation(s)
- Daniela Di Baccio
- BioLabs, Life Sciences Institute, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, I-56127 Pisa, Italy.
| | - Antonella Castagna
- Department of Crop Biology, University of Pisa, Via del Borghetto, 80, I-56124 Pisa, Italy
| | - Roberto Tognetti
- Department of Biosciences and Territory, University of Molise, Contrada Fonte Lappone, I-86090 Pesche, Italy; The EFI Project Centre on Mountain Forests (MOUNTFOR), Via Edmund Mach 1, I-38010 San Michele all'Adige, Italy
| | - Annamaria Ranieri
- Department of Crop Biology, University of Pisa, Via del Borghetto, 80, I-56124 Pisa, Italy
| | - Luca Sebastiani
- BioLabs, Life Sciences Institute, Scuola Superiore Sant'Anna, Piazza Martiri della Libertà 33, I-56127 Pisa, Italy
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Ma Y, He J, Ma C, Luo J, Li H, Liu T, Polle A, Peng C, Luo ZB. Ectomycorrhizas with Paxillus involutus enhance cadmium uptake and tolerance in Populus × canescens. PLANT, CELL & ENVIRONMENT 2014; 37:627-42. [PMID: 23937227 DOI: 10.1111/pce.12183] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Accepted: 08/06/2013] [Indexed: 05/27/2023]
Abstract
Ectomycorrhizas (EMs), which are symbiotic organs formed between tree roots and certain fungi, can mediate cadmium (Cd) tolerance of host plants, but the underlying physiological and molecular mechanisms are not fully understood. To investigate EMs mediated Cd tolerance in woody plants, Populus × canescens was inoculated with Paxillus involutus (strain MAJ) to establish mycorrhizal roots. Mycorrhizal poplars and non-mycorrhizal controls were exposed to 0 or 50 μM CdSO4 . EMs displayed higher net Cd(2+) influx than non-mycorrhizal roots. Net Cd(2+) influx was coupled with net H(+) efflux and inactivation of plasma membrane (PM) H(+) -ATPases reduced Cd(2+) uptake of EMs less than of non-mycorrhizal roots. Consistent with higher Cd(2+) uptake in EMs, in most cases, transcript levels of genes involved in Cd(2+) uptake, transport and detoxification processes were increased in EMs compared to non-mycorrhizal roots. Higher CO2 assimilation, improved nutrient and carbohydrate status, and alleviated oxidative stress were found in mycorrhizal compared to non-mycorrhizal poplars despite higher Cd(2+) accumulation. These results indicate that mycorrhizas increase Cd(2+) uptake, probably by an enlarged root volume and overexpression of genes involved in Cd(2+) uptake and transport, and concurrently enhance Po. × canescens Cd tolerance by increased detoxification, improved nutrient and carbohydrate status and defence preparedness.
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Affiliation(s)
- Yonglu Ma
- College of Forestry and State Key Laboratory of Crop Stress Biology for Arid Areas
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Sun J, Wang R, Zhang X, Yu Y, Zhao R, Li Z, Chen S. Hydrogen sulfide alleviates cadmium toxicity through regulations of cadmium transport across the plasma and vacuolar membranes in Populus euphratica cells. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2013; 65:67-74. [PMID: 23416498 DOI: 10.1016/j.plaphy.2013.01.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Accepted: 01/04/2013] [Indexed: 05/10/2023]
Abstract
Hydrogen sulfide (H2S) is emerging as a novel signalling molecule involved in plant growth and responses against abiotic stresses. However, little information is known about its role in cadmium (Cd) detoxification. In the present study, the effects of H2S on Cd toxicity were investigated in Populus euphratica cells using fluorescence imaging technique and a non-invasive vibrating ion-selective microelectrode. Pretreatment with a H2S donor, sodium hydrosulfide (NaHS), significantly mitigated the Cd-induced programmed cell death in P. euphratica cells. The alleviation effect of NaHS was more pronounced at 50-100 μM as compared to low (25 μM) and high doses (200 μM). Under Cd stress, total activities of antioxidant enzymes, such as ascorbate peroxidase, catalase and glutathione reductase, were significantly enhanced in NaHS-treated cells, leading to a decline of H2O2 accumulation and lipid peroxidation. Moreover, NaHS reduced Cd accumulation in the cytoplasm but increased the fraction of Cd in the vacuole. Cd flux profiles revealed that H2S inhibited the Cd influx through the plasma membrane (PM) calcium channels that activated by H2O2. NaHS enhanced Cd influx into the vacuole, and the Cd influx was dependent on the pH gradients across the tonoplast. Taken together, these results suggest that H2S alleviates Cd toxicity via the improvement of antioxidant system and cellular Cd homeostasis. The up-regulation of antioxidant enzymes by H2S reduced the accumulation of H2O2, and thus decreased Cd influx through the H2O2-activated PM calcium channels. The H2S-simulated vacuolar Cd sequestration was presumably due to the activation of tonoplast Cd(2+)/H(+) antiporters.
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Affiliation(s)
- Jian Sun
- College of Life Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu Province, PR China
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