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Zhao C, Cui X, Yu X, Ning X, Yu H, Li J, Yang B, Pan Y, Jiang L. Molecular evolution and functional diversification of metal tolerance protein families in cereals plants and function of maize MTP protein. Int J Biol Macromol 2024; 274:133071. [PMID: 38871096 DOI: 10.1016/j.ijbiomac.2024.133071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 05/24/2024] [Accepted: 06/08/2024] [Indexed: 06/15/2024]
Abstract
Plants employ metal tolerance proteins (MTPs) to confer tolerance by sequestering excess ions into vacuoles. MTPs belong to the cation diffusion facilitator (CDF) family, which facilitates the transport of divalent transition metal cations. In this study, we conducted a comprehensive analysis of the MTP gene families across 21 plant species, including maize (Zea mays). A total of 247 MTP genes were identified within these plant genomes and categorized into distinct subgroups, namely Zn-CDF, Mn-CDF, and Fe/Zn-CDF, based on phylogenetic analyses. This investigation encompassed the characterization of genomic distribution, gene structures, cis-regulatory elements, collinearity relationships, and gene ontology functions associated with MTPs. Transcriptomic analyses unveiled stress-specific expression patterns of MTP genes under various abiotic stresses. Moreover, quantitative RT-PCR assays were employed to assess maize MTP gene responses to diverse heavy metal stress conditions. Functional validation of metal tolerance roles was achieved through heterologous expression in yeast. This integrated evolutionary scrutiny of MTP families in cereals furnishes a valuable framework for the elucidation of MTP functions in subsequent studies. Notably, the prioritized MTP gene ZmMTP6 emerged as a positive regulator of plant Cd tolerance, thereby offering a pivotal genetic asset for the development of Cd-tolerant crops, particularly maize cultivars.
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Affiliation(s)
- Chao Zhao
- College of Agronomy, Jilin Agricultural Science and Technology University, Jilin 132101, Jilin Province, PR China; Beidahuang Kenfeng Seed Co., Ltd, Harbin 150000, Heilongjiang Province, PR China.
| | - Xueyu Cui
- Key Laboratory of Beibu Gulf Environment Change and Resources Utilization of Ministry of Education, Nanning Normal University, Nanning 530001, Guangxi Zhuang Autonomous Region Province, PR China
| | - Xiaoming Yu
- College of Agronomy, Jilin Agricultural Science and Technology University, Jilin 132101, Jilin Province, PR China.
| | - Xilin Ning
- College of Agronomy, Jilin Agricultural Science and Technology University, Jilin 132101, Jilin Province, PR China
| | - Haiyan Yu
- College of Agronomy, Jilin Agricultural Science and Technology University, Jilin 132101, Jilin Province, PR China
| | - Jianming Li
- College of Agronomy, Jilin Agricultural Science and Technology University, Jilin 132101, Jilin Province, PR China
| | - Baiming Yang
- College of Agronomy, Jilin Agricultural Science and Technology University, Jilin 132101, Jilin Province, PR China.
| | - Yexing Pan
- College of Agronomy, Jilin Agricultural Science and Technology University, Jilin 132101, Jilin Province, PR China.
| | - Long Jiang
- College of Agronomy, Jilin Agricultural Science and Technology University, Jilin 132101, Jilin Province, PR China.
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2
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Li Q, Zhang X, Zhao P, Chen Y, Ni D, Wang M. Metal tolerance protein CsMTP4 has dual functions in maintaining zinc homeostasis in tea plant. JOURNAL OF HAZARDOUS MATERIALS 2024; 471:134308. [PMID: 38631255 DOI: 10.1016/j.jhazmat.2024.134308] [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: 01/22/2024] [Revised: 04/05/2024] [Accepted: 04/13/2024] [Indexed: 04/19/2024]
Abstract
Plants have evolved a series of zinc (Zn) homeostasis mechanisms to cope with the fluctuating Zn in the environment. How Zn is taken up, translocated and tolerate by tea plant remains unknown. In this study, on the basis of RNA-Sequencing, we isolated a plasma membrane-localized Metal Tolerance Protein (MTP) family member CsMTP4 from Zn-deficient tea plant roots and investigated its role in regulation of Zn homeostasis in tea plant. Heterologous expression of CsMTP4 specifically enhanced the tolerance of transgenic yeast to Zn excess. Moreover, overexpression of CsMTP4 in tea plant hairy roots stimulated Zn uptake under Zn deficiency. In addition, CsMTP4 promoted the growth of transgenic Arabidopsis plants by translocating Zn from roots to shoots under Zn deficiency and conferred the tolerance to Zn excess by enhancing the efflux of Zn from root cells. Transcriptome analysis of the CsMTP4 transgenic Arabidopsis found that the expression of Zn metabolism-related genes were differentially regulated compared with wild-type plants when exposed to Zn deficiency and excess conditions. This study provides a mechanistic understanding of Zn uptake and translocation in plants and a new strategy to improve phytoremediation efficiency.
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Affiliation(s)
- Qinghui Li
- National Key Laboratory for Germplasm Innovation and Utilization of Horticultural Crops, College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, PR China; Joint International Research Laboratory of Germplasm Innovation and Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Xuyang Zhang
- National Key Laboratory for Germplasm Innovation and Utilization of Horticultural Crops, College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, PR China; Joint International Research Laboratory of Germplasm Innovation and Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Peiling Zhao
- National Key Laboratory for Germplasm Innovation and Utilization of Horticultural Crops, College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, PR China; Joint International Research Laboratory of Germplasm Innovation and Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Yuqiong Chen
- National Key Laboratory for Germplasm Innovation and Utilization of Horticultural Crops, College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, PR China; Joint International Research Laboratory of Germplasm Innovation and Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Dejiang Ni
- National Key Laboratory for Germplasm Innovation and Utilization of Horticultural Crops, College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, PR China; Joint International Research Laboratory of Germplasm Innovation and Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Mingle Wang
- National Key Laboratory for Germplasm Innovation and Utilization of Horticultural Crops, College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan 430070, PR China; Joint International Research Laboratory of Germplasm Innovation and Utilization of Horticultural Crops, Huazhong Agricultural University, Wuhan 430070, PR China.
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3
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Xin J. Enhancing soil health to minimize cadmium accumulation in agro-products: the role of microorganisms, organic matter, and nutrients. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 348:123890. [PMID: 38554840 DOI: 10.1016/j.envpol.2024.123890] [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: 01/06/2024] [Revised: 03/03/2024] [Accepted: 03/27/2024] [Indexed: 04/02/2024]
Abstract
Agro-products accumulate Cd from the soil and are the main source of Cd in humans. Their use must therefore be minimized using effective strategies. Large soil beds containing low-to-moderate Cd-contamination are used to produce agro-products in many developing countries to keep up with the demand of their large populations. Improving the health of Cd-contaminated soils could be a cost-effective method for minimizing Cd accumulation in crops. In this review, the latest knowledge on the physiological and molecular mechanisms of Cd uptake and translocation in crops is presented, providing a basis for developing advanced technologies for producing Cd-safe agro-products. Inoculation of plant growth-promoting rhizobacteria and arbuscular mycorrhizal fungi, application of organic matter, essential nutrients, beneficial elements, regulation of soil pH, and water management are efficient techniques used to decrease soil Cd bioavailability and inhibiting the uptake and accumulation of Cd in crops. In combination, these strategies for improving soil health are environmentally friendly and practical for reducing Cd accumulation in crops grown in lightly to moderately Cd-contaminated soil.
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Affiliation(s)
- Junliang Xin
- School of Chemical and Environmental Engineering, Hunan Institute of Technology, Heng Hua Road 18, Hengyang 421002, China.
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4
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Jia W, Guo Z, Lv S, Lin K, Li Y. SbYS1 and SbWRKY72 regulate Cd tolerance and accumulation in sweet sorghum. PLANTA 2024; 259:100. [PMID: 38536457 DOI: 10.1007/s00425-024-04388-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Accepted: 03/12/2024] [Indexed: 04/24/2024]
Abstract
MAIN CONCLUSION SbYS1 and its upstream transcription factor SbWRKY72 were involved in Cd tolerance and accumulation and are valuable for developing sweet sorghum germplasm with high-Cd tolerance or accumulation ability through genetic manipulation. Cadmium (Cd) is highly toxic and can severely affect human health. Sweet sorghum, as an energy crop, shows great potential in extracting cadmium from Cd-contaminated soils. However, its molecular mechanisms of Cd-tolerance and -accumulation remain largely unknown. Here, we isolated a YSL family gene SbYS1 from the sweet sorghum genotype with high Cd accumulation ability and the expression of SbYS1 in roots was induced by cadmium. GUS staining experiment exhibited that SbYS1 was expressed in the epidermis and parenchyma tissues of roots. Further subcellular localization analysis suggested that SbYS1 was localized in the endoplasmic reticulum and plasma membrane. Yeast transformed with SbYS1 exhibited a sensitive phenotype compared to the control when exposed to Cd-NA (chelates of cadmium and nicotianamine), indicating that SbYS1 may absorb cadmium in the form of Cd-NA. Arabidopsis overexpressing SbYS1 had a longer root length and accumulated less Cd in roots and shoots. SbWRKY72 bound to the promoter of SbYS1 and negatively regulated the expression of SbYS1. Transgenic Arabidopsis of SbWRKY72 showed higher sensitivity to cadmium and increased cadmium accumulation in roots. Our results provide references for improving the phytoremediation efficiency of sweet sorghum by genetic manipulation in the future.
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Affiliation(s)
- Weitao Jia
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, No. 20 Nanxincun, Xiangshan, Beijing, 100093, China
- Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, 401122, China
| | - Zijing Guo
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, No. 20 Nanxincun, Xiangshan, Beijing, 100093, China
- China National Botanical Garden, Beijing, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Sulian Lv
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, No. 20 Nanxincun, Xiangshan, Beijing, 100093, China
- China National Botanical Garden, Beijing, China
| | - Kangqi Lin
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, No. 20 Nanxincun, Xiangshan, Beijing, 100093, China
- China National Botanical Garden, Beijing, China
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yinxin Li
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, No. 20 Nanxincun, Xiangshan, Beijing, 100093, China.
- China National Botanical Garden, Beijing, China.
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5
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Lu J, Xing G, Zhang Y, Zhang H, Wu T, Tian Z, Qu L. Genome-wide identification, expression and function analysis of the MTP gene family in tulip ( Tulipa gesneriana). FRONTIERS IN PLANT SCIENCE 2024; 15:1346255. [PMID: 38439986 PMCID: PMC10910078 DOI: 10.3389/fpls.2024.1346255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 02/05/2024] [Indexed: 03/06/2024]
Abstract
Currently, soil heavy metal contamination is a severe issue, particularly with Cd pollution. The metal tolerance protein (MTP) proteins, as plant divalent cation transporters, play a crucial role in the transport and tolerance of heavy metals in plants. This study conducted comprehensive identification and characterization of the MTP gene family in the tulip. A total of 11 TgMTP genes were identified and phylogenetically classified into three subfamilies. Conserved motif and gene structure analyses unveiled commonalities and variations among subfamily members. Expression profiling demonstrated several TgMTPs were markedly upregulated under Cd exposure, including the TgMTP7.1. Heterologous expression in yeast validated that TgMTP7.1 could ameliorate Cd sensitivity and enhance its tolerance. These results provide primary insights into the MTP gene family in tulip. Phylogenetic relationships and functional analyses establish a framework for elucidating the transporters and molecular mechanisms governing Cd accumulation and distribution in tulip. Key TgMTPs identified, exemplified by TgMTP7.1, may illuminate molecular breeding efforts aimed at developing Cd-tolerant cultivars for the remediation of soil Cd contamination.
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Affiliation(s)
- Jiaojiao Lu
- Institute of Floriculture, Liaoning Academy of Agriculture Sciences, Shenyang, Liaoning, China
- Liaoning Provincial Key Laboratory of Floriculture, Shenyang, Liaoning, China
| | - Guimei Xing
- Institute of Floriculture, Liaoning Academy of Agriculture Sciences, Shenyang, Liaoning, China
- Liaoning Provincial Key Laboratory of Floriculture, Shenyang, Liaoning, China
| | - Yanqiu Zhang
- Institute of Floriculture, Liaoning Academy of Agriculture Sciences, Shenyang, Liaoning, China
| | - Huihua Zhang
- Institute of Floriculture, Liaoning Academy of Agriculture Sciences, Shenyang, Liaoning, China
| | - Tianyu Wu
- Institute of Floriculture, Liaoning Academy of Agriculture Sciences, Shenyang, Liaoning, China
| | - Zengzhi Tian
- Institute of Floriculture, Liaoning Academy of Agriculture Sciences, Shenyang, Liaoning, China
| | - Lianwei Qu
- Institute of Floriculture, Liaoning Academy of Agriculture Sciences, Shenyang, Liaoning, China
- Liaoning Provincial Key Laboratory of Floriculture, Shenyang, Liaoning, China
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Joshi G, Soe YP, Palanog A, Hore TK, Nha CT, Calayugan MI, Inabangan-Asilo MA, Amparado A, Pandey ID, Cruz PCS, Hernandez JE, Swamy BPM. Meta-QTL s and haplotypes for efficient zinc biofortification of rice. THE PLANT GENOME 2023; 16:e20315. [PMID: 36896580 DOI: 10.1002/tpg2.20315] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 01/23/2023] [Indexed: 06/18/2023]
Abstract
Biofortification of rice with improved grain zinc (Zn) content is the most sustainable and cost-effective approach to address Zn malnutrition in Asia. Genomics-assisted breeding using precise and consistent Zn quantitative trait loci (QTLs), genes, and haplotypes can fast-track the development of Zn biofortified rice varieties. We conducted the meta-analysis of 155 Zn QTLs reported from 26 different studies. Results revealed 57 meta-QTLs with a significant reduction of 63.2% and 80% in the number and confidence interval of the Zn QTLs, respectively. Meta-quantitative trait loci (MQTLs) regions were found to be enriched with diverse metal homeostasis genes; at least 11 MQTLs were colocated with 20 known major genes involved in the production of root exudates, metal uptake, transport, partitioning, and loading into grains in rice. These genes were differentially expressed in vegetative and reproductive tissues, and a complex web of interactions were observed among them. We identified superior haplotypes and their combinations for nine candidate genes (CGs), and the frequency and allelic effects of superior haplotypes varied in different subgroups. The precise MQTLs with high phenotypic variance, CGs, and superior haplotypes identified in our study are useful for an efficient Zn biofortification of rice and to ensure Zn as an essential component of all the future rice varieties through mainstreaming of Zn breeding.
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Affiliation(s)
- Gaurav Joshi
- Rice Genetic Design and Validation Unit, International Rice Research Institute, Los Baños, Philippines
- Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | | | | | - Tapas Kumer Hore
- Rice Genetic Design and Validation Unit, International Rice Research Institute, Los Baños, Philippines
| | - Chau Thanh Nha
- Philippines Rice Research Institute, Muñoz, Nueva Ecija, Philippines
| | | | - Mary Ann Inabangan-Asilo
- Rice Genetic Design and Validation Unit, International Rice Research Institute, Los Baños, Philippines
| | - Amery Amparado
- Rice Genetic Design and Validation Unit, International Rice Research Institute, Los Baños, Philippines
| | - Indra Deo Pandey
- Govind Ballabh Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | | | | | - B P Mallikarjuna Swamy
- Rice Genetic Design and Validation Unit, International Rice Research Institute, Los Baños, Philippines
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Yilmaz H, Özer G, Baloch FS, Çiftçi V, Chung YS, Sun HJ. Genome-Wide Identification and Expression Analysis of MTP (Metal Ion Transport Proteins) Genes in the Common Bean. PLANTS (BASEL, SWITZERLAND) 2023; 12:3218. [PMID: 37765382 PMCID: PMC10535811 DOI: 10.3390/plants12183218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 09/01/2023] [Accepted: 09/06/2023] [Indexed: 09/29/2023]
Abstract
MTP/CDF carriers, called metal ion transport proteins, act as substrates for the transmission of micronutrients such as iron (Fe), zinc (Zn), and manganese (Mn) to membrane carriers in plants. In this study, genome-wide analysis of the MTP gene family in the common bean genome, expression analysis of the PvMTP4, PvMTP5, and PvMTP12 genes after Fe and Zn treatments, and the effects of Fe and Zn applications on iron and zinc content were investigated. This study used common bean genotypes assumed to have high or low Fe and Zn accumulation ability. PvMTP genes were defined as containing conserved catalytic domains with molecular weights and protein lengths ranging from 41.35 to 91.05 kDa and from 369 to 813 amino acids (aa), respectively. As a result of the phylogenetic analysis, three main clusters containing seven subgroups were formed. In this study, the first characterization of the MTP gene family of beans was performed, and the responses of three different PvMTP genes in the Zn-CDF group to Fe and Zn applications were revealed. The obtained findings are thought to constitute pioneering resources for future research on common bean biofortification studies, plant breeding related to Fe and Zn, and the functional characterization of the MTP gene family.
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Affiliation(s)
- Hilal Yilmaz
- Plant and Animal Production Program, Izmit Vocational School, Kocaeli University, Kocaeli 41285, Türkiye;
- Department of Field Crops, Faculty of Agriculture, Bolu Abant Izzet Baysal University, Bolu 14030, Türkiye;
| | - Göksel Özer
- Department of Plant Protection, Faculty of Agriculture, Bolu Abant Izzet Baysal University, Bolu 14030, Türkiye;
| | - Faheem Shehzad Baloch
- Faculty of Agricultural Sciences and Technologies, Sivas University of Science and Technology, Sivas 58140, Türkiye
| | - Vahdettin Çiftçi
- Department of Field Crops, Faculty of Agriculture, Bolu Abant Izzet Baysal University, Bolu 14030, Türkiye;
| | - Yong Suk Chung
- Department of Plant Resources and Environment, Jeju National University, Jeju 63243, Republic of Korea;
| | - Hyeon-Jin Sun
- Subtropical Horticulture Research Institute, Jeju National University, Jeju 63243, Republic of Korea;
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8
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Ning M, Liu SJ, Deng F, Huang L, Li H, Che J, Yamaji N, Hu F, Lei GJ. A vacuolar transporter plays important roles in zinc and cadmium accumulation in rice grain. THE NEW PHYTOLOGIST 2023. [PMID: 37366232 DOI: 10.1111/nph.19070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 05/23/2023] [Indexed: 06/28/2023]
Abstract
Rice grain is a poor dietary source of zinc (Zn) but the primary source of cadmium (Cd) for humans; however, the molecular mechanisms for their accumulation in rice grain remain incompletely understood. This study functionally characterized a tonoplast-localized transporter, OsMTP1. OsMTP1 was preferentially expressed in the roots, aleurone layer, and embryo of seeds. OsMTP1 knockout decreased Zn concentration in the root cell sap, roots, aleurone layer and embryo, and subsequently increased Zn concentration in shoots and polished rice (endosperm) without yield penalty. OsMTP1 haplotype analysis revealed elite alleles associated with increased Zn level in polished rice, mostly because of the decreased OsMTP1 transcripts. OsMTP1 expression in yeast enhanced Zn tolerance but did not affect that of Cd. While OsMTP1 knockout resulted in decreased uptake, translocation and accumulation of Cd in plant and rice grain, which could be attributed to the indirect effects of altered Zn accumulation. Our results suggest that rice OsMTP1 primarily functions as a tonoplast-localized transporter for sequestrating Zn into vacuole. OsMTP1 knockout elevated Zn concentration but prevented Cd deposition in polished rice without yield penalty. Thus, OsMTP1 is a candidate gene for enhancing Zn level and reducing Cd level in rice grains.
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Affiliation(s)
- Min Ning
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Key Laboratory of Biology and Germplasm Innovation of Perennial Rice, Key Laboratory of Crop Quality Improvement of Yunnan Higher Education Institutes, School of Agriculture, Yunnan University, Kunming, 650500, China
| | - Shi Jia Liu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Key Laboratory of Biology and Germplasm Innovation of Perennial Rice, Key Laboratory of Crop Quality Improvement of Yunnan Higher Education Institutes, School of Agriculture, Yunnan University, Kunming, 650500, China
| | - Fenglin Deng
- MARA Key Laboratory of Sustainable Crop Production in the Middle Reaches of the Yangtze River (Co-construction by Ministry and Province), College of Agriculture, Yangtze University, Jingzhou, 434025, China
- Hubei Hongshan Laboratory, Wuhan, 430070, China
| | - Liyu Huang
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Key Laboratory of Biology and Germplasm Innovation of Perennial Rice, Key Laboratory of Crop Quality Improvement of Yunnan Higher Education Institutes, School of Agriculture, Yunnan University, Kunming, 650500, China
| | - Hu Li
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Key Laboratory of Biology and Germplasm Innovation of Perennial Rice, Key Laboratory of Crop Quality Improvement of Yunnan Higher Education Institutes, School of Agriculture, Yunnan University, Kunming, 650500, China
| | - Jing Che
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Naoki Yamaji
- Institute of Plant Science and Resources, Okayama University, Kurashiki, 710-0046, Japan
| | - Fengyi Hu
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Key Laboratory of Biology and Germplasm Innovation of Perennial Rice, Key Laboratory of Crop Quality Improvement of Yunnan Higher Education Institutes, School of Agriculture, Yunnan University, Kunming, 650500, China
| | - Gui Jie Lei
- State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Key Laboratory of Biology and Germplasm Innovation of Perennial Rice, Key Laboratory of Crop Quality Improvement of Yunnan Higher Education Institutes, School of Agriculture, Yunnan University, Kunming, 650500, China
- Institute of Plant Science and Resources, Okayama University, Kurashiki, 710-0046, Japan
- Institute of International Rivers and Eco-security, Yunnan University, Kunming, 650500, China
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9
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Chen X, Zhao Y, Zhong Y, Chen J, Qi X. Deciphering the functional roles of transporter proteins in subcellular metal transportation of plants. PLANTA 2023; 258:17. [PMID: 37314548 DOI: 10.1007/s00425-023-04170-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 05/31/2023] [Indexed: 06/15/2023]
Abstract
MAIN CONCLUSION The role of transporters in subcellular metal transport is of great significance for plants in coping with heavy metal stress and maintaining their proper growth and development. Heavy metal toxicity is a serious long-term threat to plant growth and agricultural production, becoming a global environmental concern. Excessive heavy metal accumulation not only damages the biochemical and physiological functions of plants but also causes chronic health hazard to human beings through the food chain. To deal with heavy metal stress, plants have evolved a series of elaborate mechanisms, especially a variety of spatially distributed transporters, to strictly regulate heavy metal uptake and distribution. Deciphering the subcellular role of transporter proteins in controlling metal absorption, transport and separation is of great significance for understanding how plants cope with heavy metal stress and improving their adaptability to environmental changes. Hence, we herein introduce the detrimental effects of excessive common essential and non-essential heavy metals on plant growth, and describe the structural and functional characteristics of transporter family members, with a particular emphasis on their roles in maintaining heavy metal homeostasis in various organelles. Besides, we discuss the potential of controlling transporter gene expression by transgenic approaches in response to heavy metal stress. This review will be valuable to researchers and breeders for enhancing plant tolerance to heavy metal contamination.
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Affiliation(s)
- Xingqi Chen
- School of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou, 215011, China
| | - Yuanchun Zhao
- School of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou, 215011, China
| | - Yuqing Zhong
- Environmental Monitoring Station of Suzhou City, Suzhou, 215004, China
| | - Jiajia Chen
- School of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou, 215011, China
| | - Xin Qi
- School of Chemistry and Life Sciences, Suzhou University of Science and Technology, Suzhou, 215011, China.
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10
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Feng S, Hou K, Zhang H, Chen C, Huang J, Wu Q, Zhang Z, Gao Y, Wu X, Wang H, Shen C. Investigation of the role of TmMYB16/123 and their targets (TmMTP1/11) in the tolerance of Taxus media to cadmium. TREE PHYSIOLOGY 2023; 43:1009-1022. [PMID: 36808461 DOI: 10.1093/treephys/tpad019] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 02/13/2023] [Indexed: 06/11/2023]
Abstract
The toxicity and stress caused by heavy metal contamination has become an important constraint to the growth and flourishing of trees. In particular, species belonging to the genus Taxus, which are the only natural source for the anti-tumor medicine paclitaxel, are known to be highly sensitive to environmental changes. To investigate the response of Taxus spp. to heavy metal stress, we analyzed the transcriptomic profiles of Taxus media trees exposed to cadmium (Cd2+). In total, six putative genes from the metal tolerance protein (MTP) family were identified in T. media, including two Cd2+ stress inducible TMP genes (TmMTP1, TmMTP11 and Taxus media). Secondary structure analyses predicted that TmMTP1 and TmMTP11, which are members of the Zn-CDF and Mn-CDF subfamily proteins, respectively, contained six and four classic transmembrane domains, respectively. The introduction of TmMTP1/11 into the ∆ycf1 yeast cadmium-sensitive mutant strain showed that TmMTP1/11 might regulate the accumulation of Cd2+ to yeast cells. To screen the upstream regulators, partial promoter sequences of the TmMTP1/11 genes were isolated using the chromosome walking method. Several myeloblastosis (MYB) recognition elements were identified in the promoters of these genes. Furthermore, two Cd2+-induced R2R3-MYB TFs, TmMYB16 and TmMYB123, were identified. Both in vitro and in vivo assays confirmed that TmMTB16/123 play a role in Cd2+ tolerance by activating and repressing the expression of TmMTP1/11 genes. The present study elucidated new regulatory mechanisms underlying the response to Cd stress and can contribute to the breeding of Taxus species with high environmental adaptability.
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Affiliation(s)
- Shangguo Feng
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 311121, China
| | - Kailin Hou
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 311121, China
| | - Hongshan Zhang
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 311121, China
| | - Cheng Chen
- College of Pharmacy, Hangzhou Normal University, Hangzhou 311121, China
| | - Jiefang Huang
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 311121, China
| | - Qicong Wu
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 311121, China
| | - Zhenhao Zhang
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 311121, China
| | - Yadi Gao
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 311121, China
| | - Xiaomei Wu
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
| | - Huizhong Wang
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 311121, China
| | - Chenjia Shen
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou 311121, China
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11
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Fan P, Wu L, Wang Q, Wang Y, Luo H, Song J, Yang M, Yao H, Chen S. Physiological and molecular mechanisms of medicinal plants in response to cadmium stress: Current status and future perspective. JOURNAL OF HAZARDOUS MATERIALS 2023; 450:131008. [PMID: 36842201 DOI: 10.1016/j.jhazmat.2023.131008] [Citation(s) in RCA: 23] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 02/08/2023] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
Medicinal plants have a wide range of uses worldwide. However, the quality of medicinal plants is affected by severe cadmium pollution. Cadmium can reduce photosynthetic capacity, lead to plant growth retardation and oxidative stress, and affect secondary metabolism. Medicinal plants have complex mechanisms to cope with cadmium stress. On the one hand, an antioxidant system can effectively scavenge excess reactive oxygen species produced by cadmium stress. On the other hand, cadmium chelates are formed by chelating peptides and then sequestered through vacuolar compartmentalization. Cadmium has no specific transporter in plants and is generally transferred to plant tissues through competition for the transporters of divalent metal ions, such as zinc, iron, and manganese. In recent years, progress has been achieved in exploring the physiological mechanisms by which medicinal plants responding to cadmium stress. The exogenous regulation of cadmium accumulation in medicinal plants has been studied, and the aim is reducing the toxicity of cadmium. However, research into molecular mechanisms is still lagging. In this paper, we review the physiological and molecular mechanisms and regulatory networks of medicinal plants exposed to cadmium, providing a reference for the study on the responses of medicinal plants to cadmium stress.
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Affiliation(s)
- Panhui Fan
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People's Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China
| | - Liwei Wu
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People's Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China
| | - Qing Wang
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People's Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China
| | - Yu Wang
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People's Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China
| | - Hongmei Luo
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People's Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China
| | - Jingyuan Song
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People's Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China
| | - Meihua Yang
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People's Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China
| | - Hui Yao
- Key Lab of Chinese Medicine Resources Conservation, State Administration of Traditional Chinese Medicine of the People's Republic of China, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China; Engineering Research Center of Chinese Medicine Resources, Ministry of Education, Beijing 100193, China.
| | - Shilin Chen
- Institute of Herbgenomics, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China.
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12
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Shirazi Z, Khakdan F, Rafiei F, Balalami MY, Ranjbar M. Genome-wide identification and expression profile analysis of metal tolerance protein gene family in Eucalyptus grandis under metal stresses. BMC PLANT BIOLOGY 2023; 23:240. [PMID: 37149585 PMCID: PMC10163719 DOI: 10.1186/s12870-023-04240-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 04/21/2023] [Indexed: 05/08/2023]
Abstract
Metal tolerance proteins (MTPs) as Me2+/H+(K+) antiporters participate in the transport of divalent cations, leading to heavy metal stress resistance and mineral utilization in plants. In the present study, to obtain better knowledge of the biological functions of the MTPs family, 20 potential EgMTPs genes were identified in Eucalyptus grandis and classified into seven groups belonging to three cation diffusion facilitator groups (Mn-CDFs, Zn/Fe-CDFs, and Zn-CDFs) and seven groups. EgMTP-encoded amino acids ranged from 315 to 884, and most of them contained 4-6 recognized transmembrane domains and were clearly prognosticated to localize into the cell vacuole. Almost all EgMTP genes experienced gene duplication events, in which some might be uniformly distributed in the genome. The numbers of cation efflux and the zinc transporter dimerization domain were highest in EgMTP proteins. The promoter regions of EgMTP genes have different cis-regulatory elements, indicating that the transcription rate of EgMTP genes can be a controlled response to different stimuli in multiple pathways. Our findings provide accurate perception on the role of the predicted miRNAs and the presence of SSR marker in the Eucalyptus genome and clarify their functions in metal tolerance regulation and marker-assisted selection, respectively. Gene expression profiling based on previous RNA-seq data indicates a probable function for EgMTP genes during development and responses to biotic stress. Additionally, the upregulation of EgMTP6, EgMTP5, and EgMTP11.1 to excess Cd2+ and Cu2+ exposure might be responsible for metal translocation from roots to leaves.
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Affiliation(s)
- Zahra Shirazi
- Department of Biotechnology Research, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), National Botanical Garden, Tehran Karaj Freeway, P.O. Box 13185-116, Tehran, Iran.
| | | | - Fariba Rafiei
- Department of Agronomy, Purdue University, West Lafayette, IN, 47907, USA
| | - Mahdi Yahyazadeh Balalami
- Department of Medicinal Plant Research, Research Institute of Forests and Rangelands, Agricultural Research, Education and Extension Organization (AREEO), National Botanical Garden, Tehran Karaj Freeway, P.O. Box 13185-116, Tehran, Iran
| | - Mojtaba Ranjbar
- Microbial Biotechnology Department, College of Biotechnology, University of Special Modern Technologies, Amol, Iran
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13
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Farthing EC, Henbest KC, Garcia‐Becerra T, Peaston KA, Williams LE. Dissecting the relative contribution of ECA3 and group 8/9 cation diffusion facilitators to manganese homeostasis in Arabidopsis thaliana. PLANT DIRECT 2023; 7:e495. [PMID: 37228331 PMCID: PMC10202827 DOI: 10.1002/pld3.495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 03/14/2023] [Accepted: 03/27/2023] [Indexed: 05/27/2023]
Abstract
Manganese (Mn) is an essential micronutrient for plant growth but becomes toxic when present in excess. A number of Arabidopsis proteins are involved in Mn transport including ECA3, MTPs, and NRAMPs; however, their relative contributions to Mn homeostasis remain to be demonstrated. A major focus here was to clarify the importance of ECA3 in responding to Mn deficiency and toxicity using a range of mutants. We show that ECA3 localizes to the trans-Golgi and plays a major role in response to Mn deficiency with severe effects seen in eca3 nramp1 nramp2 under low Mn supply. ECA3 plays a minor role in Mn-toxicity tolerance, but only when the cis-Golgi-localized MTP11 is non-functional. We also use mutants and overexpressors to determine the relative contributions of MTP members to Mn homeostasis. The trans-Golgi-localized MTP10 plays a role in Mn-toxicity tolerance, but this is only revealed in mutants when MTP8 and MTP11 are non-functional and when overexpressed in mtp11 mutants. MTP8 and MTP10 confer greater Mn-toxicity resistance to the pmr1 yeast mutant than MTP11, and an important role for the first aspartate in the fifth transmembrane domain DxxxD motif is demonstrated. Overall, new insight into the relative influence of key transporters in Mn homeostasis is provided.
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Affiliation(s)
- Emily C. Farthing
- School of Biological SciencesUniversity of SouthamptonSouthamptonHampshireUK
| | - Kate C. Henbest
- School of Biological SciencesUniversity of SouthamptonSouthamptonHampshireUK
| | | | - Kerry A. Peaston
- School of Biological SciencesUniversity of SouthamptonSouthamptonHampshireUK
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14
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Alejandro S, Meier B, Hoang MTT, Peiter E. Cation diffusion facilitator proteins of Beta vulgaris reveal diversity of metal handling in dicotyledons. PLANT, CELL & ENVIRONMENT 2023; 46:1629-1652. [PMID: 36698321 DOI: 10.1111/pce.14544] [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: 06/07/2021] [Accepted: 01/17/2023] [Indexed: 06/17/2023]
Abstract
Manganese (Mn), iron (Fe), and zinc (Zn) are essential for diverse processes in plants, but their availability is often limiting or excessive. Cation diffusion facilitator (CDF) proteins have been implicated in the allocation of those metals in plants, whereby most of our mechanistic understanding has been obtained in Arabidopsis. It is unclear to what extent this can be generalized to other dicots. We characterized all CDFs/metal tolerance proteins of sugar beet (Beta vulgaris spp. vulgaris), which is phylogenetically distant from Arabidopsis. Analysis of subcellular localization, substrate selectivities, and transcriptional regulation upon exposure to metal deficiencies and toxicities revealed unexpected deviations from their Arabidopsis counterparts. Localization and selectivity of some members were modulated by alternative splicing. Notably, unlike in Arabidopsis, Mn- and Zn-sequestrating members were not induced in Fe-deficient roots, pointing to differences in the Fe acquisition machinery. This was supported by low Zn and Mn accumulation under Fe deficiency and a strikingly increased Fe accumulation under Mn and Zn excess, coinciding with an induction of BvIRT1. High Zn load caused a massive upregulation of Zn-BvMTPs. The results suggest that the employment of the CDF toolbox is highly diverse amongst dicots, which questions the general applicability of metal homeostasis models derived from Arabidopsis.
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Affiliation(s)
- Santiago Alejandro
- Plant Nutrition Laboratory, Faculty of Natural Sciences III, Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Bastian Meier
- Plant Nutrition Laboratory, Faculty of Natural Sciences III, Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Minh Thi Thanh Hoang
- Plant Nutrition Laboratory, Faculty of Natural Sciences III, Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Edgar Peiter
- Plant Nutrition Laboratory, Faculty of Natural Sciences III, Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
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15
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Tong M, Liu X, Guan J, Lin Y, Zhou A, Qiao K. Novel biofortification candidate: MTP1 increases microelement contents and decreases toxic heavy metal accumulation in grains. CHEMOSPHERE 2023; 318:137967. [PMID: 36731661 DOI: 10.1016/j.chemosphere.2023.137967] [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: 11/10/2022] [Revised: 01/16/2023] [Accepted: 01/24/2023] [Indexed: 06/18/2023]
Abstract
Decreases in microelement contents and increases in toxic element levels seriously affect crop growth and human health. Thus, improving the elemental content of food crops is an important environmental issue for enhancing crop production and quality. Previous research showed that metal tolerance protein 1 (MTP1) is localized at the vacuole membrane, wherein it mediates the translocation of heavy metal ions. Therefore, LmMTP1 was isolated from annual ryegrass (Lolium multiflorum). Real-time quantitative PCR analyses revealed LmMTP1 expression increased significantly in the roots after Zn, Co, and Cd treatments. Confocal microscopy images indicated LmMTP1 was localized at the vacuole membrane. The expression of LmMTP1 in transgenic yeast and rice resulted in increased Zn, Co, and Cd tolerance. The examination of heavy metal contents detected increases in the Zn and Co contents, but decreases in the Cd contents, of yeast and rice. Moreover, the grains of LmMTP1-expressing transgenic rice had higher Zn/Co contents and lower Cd contents than wild-type rice grains. These results imply that LmMTP1 influences Zn, Co, and Cd tolerance and accumulation. Furthermore, LmMTP1 might be a novel biofortification-related candidate gene useful for improving the storage of essential elements and eliminating toxic heavy metals from crops.
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Affiliation(s)
- Mingyue Tong
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, 150030, PR China
| | - Xiang Liu
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, 150030, PR China
| | - Jing Guan
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, 150030, PR China
| | - Yuanyuan Lin
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, 150030, PR China
| | - Aimin Zhou
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, 150030, PR China
| | - Kun Qiao
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin, 150030, PR China.
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16
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Krishna TPA, Maharajan T, Ceasar SA. The Role of Membrane Transporters in the Biofortification of Zinc and Iron in Plants. Biol Trace Elem Res 2023; 201:464-478. [PMID: 35182385 DOI: 10.1007/s12011-022-03159-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 02/11/2022] [Indexed: 01/11/2023]
Abstract
Over three billion people suffer from various health issues due to the low supply of zinc (Zn) and iron (Fe) in their food. Low supply of micronutrients is the main cause of malnutrition and biofortification could help to solve this issue. Understanding the molecular mechanisms of biofortification is challenging. The membrane transporters are involved in the uptake, transport, storage, and redistribution of Zn and Fe in plants. These transporters are also involved in biofortification and help to load the Zn and Fe into the endosperm of the seeds. Very little knowledge is available on the role and functions of membrane transporters involved in seed biofortification. Understanding the mechanism and role of membrane transporters could be helpful to improve biofortification. In this review, we provide the details on membrane transporters involved in the uptake, transport, storage, and redistribution of Zn and Fe. We also discuss available information on transporters involved in seed biofortification. This review will help plant breeders and molecular biologists understand the importance and implications of membrane transporters for seed biofortification.
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Affiliation(s)
- T P Ajeesh Krishna
- Department of Biosciences, Rajagiri College of Social Sciences, Kochi, 683104, Kerala, India
| | - T Maharajan
- Department of Biosciences, Rajagiri College of Social Sciences, Kochi, 683104, Kerala, India
| | - S Antony Ceasar
- Department of Biosciences, Rajagiri College of Social Sciences, Kochi, 683104, Kerala, India.
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17
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Tanwar UK, Stolarska E, Rudy E, Paluch-Lubawa E, Grabsztunowicz M, Arasimowicz-Jelonek M, Sobieszczuk-Nowicka E. Metal tolerance gene family in barley: an in silico comprehensive analysis. J Appl Genet 2022; 64:197-215. [PMID: 36586056 PMCID: PMC10076399 DOI: 10.1007/s13353-022-00744-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 12/20/2022] [Accepted: 12/21/2022] [Indexed: 01/01/2023]
Abstract
Metal-tolerance proteins (MTPs) are divalent cation transporters that play critical roles in metal tolerance and ion homeostasis in plants. However, a comprehensive study of MTPs is still lacking in crop plants. The current study aimed to comprehensively identify and characterize the MTP gene family in barley (Hordeum vulgare, Hv), an important crop. In total, 12 HvMTPs were identified in the barley genome in this study. They were divided into three phylogenetic groups (Zn-cation diffusion facilitator proteins [CDFs], Fe/Zn-CDFs, and Mn-CDFs) and further subdivided into seven groups (G1, G5, G6, G7, G8, G9, and G12). The majority of MTPs were hydrophobic proteins found in the vacuolar membrane. Gene duplication analysis of HvMTPs revealed one pair of segmental-like duplications in the barley genome. Evolutionary analysis suggested that barley MTPs underwent purifying natural selection. Additionally, the HvMTPs were analyzed in the pan-genome sequences of barley (20 accessions), which suggests that HvMTPs are highly conserved in barley evolution. Cis-acting regulatory elements, microRNA target sites, and protein-protein interaction analysis indicated the role of HvMTPs in a variety of biological processes. Expression profiling suggests that HvMTPs play an active role in maintaining barley nutrient homeostasis throughout its life cycle, and their expression levels were not significantly altered by abiotic stresses like cold, drought, or heat. The expression of barley HvMTP genes in the presence of heavy metals such as Zn2+, Cu2+, As3+, and Cd2+ revealed that these MTPs were induced by at least one metal ion, implying their involvement in metal tolerance or transportation. The identification and comprehensive investigation of MTP gene family members will provide important gene resources for the genetic improvement of crops for metal tolerance, bioremediation, or biofortification of staple crops.
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Affiliation(s)
- Umesh Kumar Tanwar
- Department of Plant Physiology, Faculty of Biology, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 6, 61-614, Poznań, Poland.
| | - Ewelina Stolarska
- Department of Plant Physiology, Faculty of Biology, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 6, 61-614, Poznań, Poland
| | - Elżbieta Rudy
- Department of Plant Physiology, Faculty of Biology, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 6, 61-614, Poznań, Poland
| | - Ewelina Paluch-Lubawa
- Department of Plant Physiology, Faculty of Biology, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 6, 61-614, Poznań, Poland
| | - Magda Grabsztunowicz
- Department of Plant Physiology, Faculty of Biology, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 6, 61-614, Poznań, Poland
| | - Magdalena Arasimowicz-Jelonek
- Department of Plant Ecophysiology, Faculty of Biology, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 6, 61-614, Poznań, Poland
| | - Ewa Sobieszczuk-Nowicka
- Department of Plant Physiology, Faculty of Biology, Adam Mickiewicz University, ul. Uniwersytetu Poznańskiego 6, 61-614, Poznań, Poland.
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18
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Wang F, Qiao K, Wang H, Wang H, Chai T. MTP8 from Triticum urartu Is Primarily Responsible for Manganese Tolerance. Int J Mol Sci 2022; 23:ijms23105683. [PMID: 35628492 PMCID: PMC9144917 DOI: 10.3390/ijms23105683] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 05/15/2022] [Accepted: 05/16/2022] [Indexed: 12/10/2022] Open
Abstract
Mineral nutrients, such as manganese (Mn) and iron (Fe), play essential roles in many biological processes in plants but their over-enrichment is harmful for the metabolism. Metal tolerance proteins (MTPs) are involved in cellular Mn and Fe homeostasis. However, the transporter responsible for the transport of Mn in wheat is unknown. In our study, TuMTP8, a Mn-CDF transporter from diploid wheat (Triticum urartu), was identified. Expression of TuMTP8 in yeast strains of Δccc1 and Δsmf1 and Arabidopsis conferred tolerance to elevated Mn and Fe, but not to other metals (zinc, cobalt, copper, nickel, or cadmium). Compared with TuVIT1 (vacuole Fe transporter), TuMTP8 shows a significantly higher proportion in Mn transport and a smaller proportion in Fe transport. The transient analysis in tobacco epidermal cells revealed that TuMTP8 localizes to vacuolar membrane. The highest transcript levels of TuMTP8 were in the sheath of the oldest leaf and the awn, suggesting that TuMTP8 sequesters excess Mn into the vacuole in these organs, away from more sensitive tissues. These findings indicate that TuMTP8, a tonoplast-localized Mn/Fe transporter, functions as a primary balancer to regulate Mn distribution in T. urartu under elevated Mn conditions and participates in the intracellular transport and storage of excess Mn as a detoxification mechanism, thereby conferring Mn tolerance.
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Affiliation(s)
- Fanhong Wang
- College of Life Sciences, Northwest Normal University, Lanzhou 730070, China;
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
| | - Kun Qiao
- College of Horticulture and Landscape Architecture, Northeast Agricultural University, Harbin 150030, China;
| | - Huanhuan Wang
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
| | - Hong Wang
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
- Correspondence: (H.W.); (T.C.); Tel./Fax: +86-10-88256343 (T.C.)
| | - Tuanyao Chai
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
- The Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing 100049, China
- Correspondence: (H.W.); (T.C.); Tel./Fax: +86-10-88256343 (T.C.)
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19
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Liu B, Yu H, Yang Q, Ding L, Sun F, Qu J, Feng W, Yang Q, Li W, Fu F. Zinc Transporter ZmLAZ1-4 Modulates Zinc Homeostasis on Plasma and Vacuolar Membrane in Maize. FRONTIERS IN PLANT SCIENCE 2022; 13:881055. [PMID: 35586216 PMCID: PMC9108671 DOI: 10.3389/fpls.2022.881055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 04/04/2022] [Indexed: 06/15/2023]
Abstract
Zinc is an essential micronutrient for plant growth and development, and functions as a cofactor for hundreds of transcription factors and enzymes in numerous biological processes. Zinc deficiency is common abiotic stress resulting in yield loss and quality deterioration of crops, but zinc excess causes toxicity for biological systems. In plants, zinc homeostasis is tightly modulated by zinc transporters and binding compounds that uptake/release, transport, localize, and store zinc, as well as their upstream regulators. Lazarus 1 (LAZ1), a member of DUF300 protein family, functions as transmembrane organic solute transporter in vertebrates. However, the function of LAZ1 in plants is still obscure. In the present study, the ZmLAZ1-4 protein was confirmed to bind to zinc ions by bioinformatic prediction and thermal shift assay. Heterologous expression of ZmLAZ1-4 in the zinc-sensitive yeast mutant, Arabidopsis, and maize significantly facilitated the accumulation of Zn2+ in transgenic lines, respectively. The result of subcellular localization exhibited that ZmLAZ1-4 was localized on the plasma and vacuolar membrane, as well as chloroplast. Moreover, the ZmLAZ1-4 gene was negatively co-expressed with ZmBES1/BZR1-11 gene through co-expression and real-time quantitative PCR analysis. The results of yeast one-hybrid and dual-luciferase assay suggested that ZmBES1/BZR1-11 could bind to ZmLAZ1-4 promoter to inhibit its transcription. All results indicated that ZmLAZ1-4 was a novel zinc transporter on plasma and vacuolar membrane, and transported zinc under negative regulation of the ZmBES1/BZR1-11 transcription factor. The study provides insights into further underlying the mechanism of ZmLAZ1-4 regulating zinc homeostasis.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Wanchen Li
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, China
| | - Fengling Fu
- Key Laboratory of Biology and Genetic Improvement of Maize in Southwest Region, Ministry of Agriculture, Maize Research Institute, Sichuan Agricultural University, Chengdu, China
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20
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Amini S, Arsova B, Hanikenne M. The molecular basis of zinc homeostasis in cereals. PLANT, CELL & ENVIRONMENT 2022; 45:1339-1361. [PMID: 35037265 DOI: 10.1111/pce.14257] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 11/12/2021] [Accepted: 12/16/2021] [Indexed: 06/14/2023]
Abstract
Plants require zinc (Zn) as an essential cofactor for diverse molecular, cellular and physiological functions. Zn is crucial for crop yield, but is one of the most limiting micronutrients in soils. Grasses like rice, wheat, maize and barley are crucial sources of food and nutrients for humans. Zn deficiency in these species therefore not only reduces annual yield but also directly results in Zn malnutrition of more than two billion people in the world. There has been good progress in understanding Zn homeostasis and Zn deficiency mechanisms in plants. However, our current knowledge of monocots, including grasses, remains insufficient. In this review, we provide a summary of our knowledge of molecular Zn homeostasis mechanisms in monocots, with a focus on important cereal crops. We additionally highlight divergences in Zn homeostasis of monocots and the dicot model Arabidopsis thaliana, as well as important gaps in our knowledge that need to be addressed in future research on Zn homeostasis in cereal monocots.
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Affiliation(s)
- Sahand Amini
- InBioS-PhytoSystems, Translational Plant Biology, University of Liège, Liège, Belgium
| | - Borjana Arsova
- Root Dynamics Group, IBG-2 - Plant Sciences, Institut für Bio- und Geowissenschaften (IBG), Forschungszentrum, Jülich, Germany
| | - Marc Hanikenne
- InBioS-PhytoSystems, Translational Plant Biology, University of Liège, Liège, Belgium
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21
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Khanna K, Kohli SK, Ohri P, Bhardwaj R, Ahmad P. Agroecotoxicological Aspect of Cd in Soil–Plant System: Uptake, Translocation and Amelioration Strategies. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:30908-30934. [PMID: 0 DOI: 10.1007/s11356-021-18232-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Accepted: 12/16/2021] [Indexed: 05/27/2023]
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22
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Xie T, Yang W, Chen X, Rong H, Wang Y, Jiang J. Genome-Wide Identification and Expressional Profiling of the Metal Tolerance Protein Gene Family in Brassica napus. Genes (Basel) 2022; 13:genes13050761. [PMID: 35627146 PMCID: PMC9141485 DOI: 10.3390/genes13050761] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2022] [Revised: 04/22/2022] [Accepted: 04/23/2022] [Indexed: 02/04/2023] Open
Abstract
The Cation Diffusion Facilitator (CDF) family, also named Metal Tolerance Protein (MTP), is one of the gene families involved in heavy metal transport in plants. However, a comprehensive study of MTPs in Brassica napus has not been reported yet. In the present study, we identified 33 BnMTP genes from the rapeseed genome using bioinformatic analyses. Subsequently, we analyzed the phylogenetic relationship, gene structure, chromosome distribution, conserved domains, and motifs of the BnMTP gene family. The 33 BnMTPs were phylogenetically divided into three major clusters (Zn-CDFs, Fe/Zn-CDFs, and Mn-CDFs) and seven groups (group 1, 5, 6, 7, 8, 9, and 12). The structural characteristics of the BnMTP members were similar in the same group, but different among groups. Evolutionary analysis indicated that the BnMTP gene family mainly expanded through whole-genome duplication (WGD) and segmental duplication events. Moreover, the prediction of cis-acting elements and microRNA target sites suggested that BnMTPs might be involved in plant growth, development, and stress responses. In addition, we found the expression of 24 BnMTPs in rapeseed leaves or roots could respond to heavy metal ion treatments. These results provided an important basis for clarifying the biological functions of BnMTPs, especially in heavy metal detoxification, and will be helpful in the phytoremediation of heavy metal pollution in soil.
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Affiliation(s)
- Tao Xie
- Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University, Yangzhou 225009, China; (T.X.); (W.Y.); (X.C.); (Y.W.)
- Joint International Research Laboratory of Agriculture and Agri-Product Safety, The Ministry of Education of China, Yangzhou 225009, China
| | - Wenjing Yang
- Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University, Yangzhou 225009, China; (T.X.); (W.Y.); (X.C.); (Y.W.)
| | - Xin Chen
- Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University, Yangzhou 225009, China; (T.X.); (W.Y.); (X.C.); (Y.W.)
| | - Hao Rong
- School of Biological and Food Engineering, Suzhou University, Suzhou 234000, China;
| | - Youping Wang
- Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University, Yangzhou 225009, China; (T.X.); (W.Y.); (X.C.); (Y.W.)
| | - Jinjin Jiang
- Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology, Yangzhou University, Yangzhou 225009, China; (T.X.); (W.Y.); (X.C.); (Y.W.)
- Correspondence: ; Tel.: +86-514-87997303
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Han L, Wu X, Zhang X, Hou K, Zhang H, Shen C. Identification and functional analysis of cation-efflux transporter 1 from Brassica juncea L. BMC PLANT BIOLOGY 2022; 22:174. [PMID: 35387616 PMCID: PMC8985314 DOI: 10.1186/s12870-022-03569-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Accepted: 03/31/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Brassica juncea behaves as a moderate-level accumulator of various heavy metal ions and is frequently used for remediation. To investigate the roles of metal ion transporters in B. juncea, a cation-efflux family gene, BjCET1, was cloned and functionally characterized. RESULTS BjCET1 contains 382 amino acid residues, including a signature motif of the cation diffusion facilitator protein family, six classic trans-membrane-spanning structures and a cation-efflux domain. A phylogenetic analysis showed that BjCET1 has a high similarity level with metal tolerance proteins from other Brassica plants, indicating that this protein family is highly conserved in Brassica. BjCET1 expression significantly increased at very early stages during both cadmium and zinc treatments. Green fluorescence detection in transgenic tobacco leaves revealed that BjCET1 is a plasma membrane-localized protein. The heterologous expression of BjCET1 in a yeast mutant increased the heavy-metal tolerance and decreased the cadmium or zinc accumulations in yeast cells, suggesting that BjCET1 is a metal ion transporter. The constitutive expression of BjCET1 rescued the heavy-metal tolerance capability of transgenic tobacco plants. CONCLUSIONS The data suggest that BjCET1 is a membrane-localized efflux transporter that plays essential roles in heavy metal ion homeostasis and hyper-accumulation.
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Affiliation(s)
- Lu Han
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036 China
- Zhejiang Key Laboratory of Organ Development and Regeneration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036 Zhejiang China
| | - Xiaohua Wu
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036 China
- Zhejiang Key Laboratory of Organ Development and Regeneration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036 Zhejiang China
| | - Xinyu Zhang
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036 China
- Zhejiang Key Laboratory of Organ Development and Regeneration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036 Zhejiang China
| | - Kailin Hou
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036 China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou, 310036 China
| | - Hongshan Zhang
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036 China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou, 310036 China
| | - Chenjia Shen
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036 China
- Zhejiang Provincial Key Laboratory for Genetic Improvement and Quality Control of Medicinal Plants, Hangzhou Normal University, Hangzhou, 310036 China
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Wang X, Wang C, Zhang Z, Shi G. Genome-wide Identification of Metal Tolerance Protein Genes in Peanut: Differential Expression in the Root of Two Contrasting Cultivars Under Metal Stresses. FRONTIERS IN PLANT SCIENCE 2022; 13:791200. [PMID: 35432419 PMCID: PMC9011049 DOI: 10.3389/fpls.2022.791200] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 03/15/2022] [Indexed: 05/23/2023]
Abstract
Metal tolerance proteins (MTP) are Me2+/H+(K+) antiporters that play important roles in the transport of divalent cations in plants. However, their functions in peanut are unknown. In the present study, a total of 24 AhMTP genes were identified in peanut, which were divided into seven groups belonging to three substrate-specific clusters (Zn-CDFs, Zn/Fe-CDFs, and Mn-CDFs). All AhMTP genes underwent whole genome or segmental gene duplication events except AhMTP12. Most AhMTP members within the same subfamily or group generally have similar gene and protein structural characteristics. However, some genes, such as AhMTP1.3, AhMTP2.4, and AhMTP12, showed wide divergences. Most of AhMTP genes preferentially expressed in reproductive tissues, suggesting that these genes might play roles in metal transport during the pod and seed development stages. Excess metal exposure induced expressions for most of AhMTP genes in peanut roots depending on cultivars. By contrast, AhMTP genes in the root of Fenghua 1 were more sensitive to excess Fe, Cd, and Zn exposure than that of Silihong. Stepwise linear regression analysis showed that the percentage of Fe in shoots significantly and positively correlated with the expression of AhMTP4.1, AhMTP9.1, and AhMTPC4.1, but negatively correlated with that of AhMTPC2.1 and AhMTP12. The expression of AhMTP1.1 showed a significant and negative correlation with the percentage of Mn in shoots. The percentage of Zn in shoots was significantly and positively correlated with the expression of AhMTP2.1 but was negatively correlated with that of AhMTPC2.1. The differential responses of AhMTP genes to metal exposure might be, at least partially, responsible for the different metal translocation from roots to shoots between Fenghua 1 and Silihong.
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Huang S, Yamaji N, Feng Ma J. Zinc transport in rice: how to balance optimal plant requirements and human nutrition. JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:1800-1808. [PMID: 34727182 DOI: 10.1093/jxb/erab478] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 10/27/2021] [Indexed: 05/15/2023]
Abstract
Zinc (Zn) is an essential micronutrient for both plants and animals, while its deficiency in crops and humans is a global problem that affects both crop productivity and human health. Since plants and humans differ in their Zn requirements, it is crucial to balance plant nutrition and human nutrition for Zn. In this review, we focus on the transport system of Zn from soil to grain in rice (Oryza sativa), which is a major dietary source of Zn for people subsiding on rice-based diets. We describe transporters belonging to the different families that are involved in the uptake, vacuolar sequestration, root-to-shoot translocation, and distribution of Zn, and discuss their mechanisms of regulation. We give examples for enhancing Zn accumulation and bioavailability in rice grains through the manipulation of genes that are highly expressed in the nodes, where Zn is deposited at high concentrations. Finally, we provide our perspectives on breeding rice cultivars with both increased tolerance to Zn-deficiency stress and high Zn density in the grains.
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Affiliation(s)
- Sheng Huang
- Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki, Japan
| | - Naoki Yamaji
- Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki, Japan
| | - Jian Feng Ma
- Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki, Japan
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26
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Zulfiqar U, Jiang W, Xiukang W, Hussain S, Ahmad M, Maqsood MF, Ali N, Ishfaq M, Kaleem M, Haider FU, Farooq N, Naveed M, Kucerik J, Brtnicky M, Mustafa A. Cadmium Phytotoxicity, Tolerance, and Advanced Remediation Approaches in Agricultural Soils; A Comprehensive Review. FRONTIERS IN PLANT SCIENCE 2022; 13:773815. [PMID: 35371142 PMCID: PMC8965506 DOI: 10.3389/fpls.2022.773815] [Citation(s) in RCA: 56] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 02/02/2022] [Indexed: 05/03/2023]
Abstract
Cadmium (Cd) is a major environmental contaminant due to its widespread industrial use. Cd contamination of soil and water is rather classical but has emerged as a recent problem. Cd toxicity causes a range of damages to plants ranging from germination to yield suppression. Plant physiological functions, i.e., water interactions, essential mineral uptake, and photosynthesis, are also harmed by Cd. Plants have also shown metabolic changes because of Cd exposure either as direct impact on enzymes or other metabolites, or because of its propensity to produce reactive oxygen species, which can induce oxidative stress. In recent years, there has been increased interest in the potential of plants with ability to accumulate or stabilize Cd compounds for bioremediation of Cd pollution. Here, we critically review the chemistry of Cd and its dynamics in soil and the rhizosphere, toxic effects on plant growth, and yield formation. To conserve the environment and resources, chemical/biological remediation processes for Cd and their efficacy have been summarized in this review. Modulation of plant growth regulators such as cytokinins, ethylene, gibberellins, auxins, abscisic acid, polyamines, jasmonic acid, brassinosteroids, and nitric oxide has been highlighted. Development of plant genotypes with restricted Cd uptake and reduced accumulation in edible portions by conventional and marker-assisted breeding are also presented. In this regard, use of molecular techniques including identification of QTLs, CRISPR/Cas9, and functional genomics to enhance the adverse impacts of Cd in plants may be quite helpful. The review's results should aid in the development of novel and suitable solutions for limiting Cd bioavailability and toxicity, as well as the long-term management of Cd-polluted soils, therefore reducing environmental and human health hazards.
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Affiliation(s)
- Usman Zulfiqar
- Department of Agronomy, University of Agriculture Faisalabad, Faisalabad, Pakistan
| | - Wenting Jiang
- College of Life Sciences, Yan’an University, Yan’an, China
| | - Wang Xiukang
- College of Life Sciences, Yan’an University, Yan’an, China
| | - Saddam Hussain
- Department of Agronomy, University of Agriculture Faisalabad, Faisalabad, Pakistan
| | - Muhammad Ahmad
- Department of Agronomy, University of Agriculture Faisalabad, Faisalabad, Pakistan
| | | | - Nauman Ali
- Agronomic Research Institute, Ayub Agricultural Research Institute, Faisalabad, Pakistan
| | - Muhammad Ishfaq
- Department of Agronomy, University of Agriculture Faisalabad, Faisalabad, Pakistan
| | - Muhammad Kaleem
- Department of Botany, University of Agriculture Faisalabad, Faisalabad, Pakistan
| | - Fasih Ullah Haider
- College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, China
| | - Naila Farooq
- Department of Soil and Environmental Science, College of Agriculture, University of Sargodha, Sargodha, Pakistan
| | - Muhammad Naveed
- Institute of Soil and Environmental Science, University of Agriculture Faisalabad, Faisalabad, Pakistan
| | - Jiri Kucerik
- Institute of Chemistry and Technology of Environmental Protection, Faculty of Chemistry, Brno University of Technology, Brno, Czechia
| | - Martin Brtnicky
- Institute of Chemistry and Technology of Environmental Protection, Faculty of Chemistry, Brno University of Technology, Brno, Czechia
- Department of Agrochemistry, Soil Science, Microbiology and Plant Nutrition, Faculty of AgriSciences, Mendel University in Brno, Brno, Czechia
| | - Adnan Mustafa
- Institute of Chemistry and Technology of Environmental Protection, Faculty of Chemistry, Brno University of Technology, Brno, Czechia
- Department of Agrochemistry, Soil Science, Microbiology and Plant Nutrition, Faculty of AgriSciences, Mendel University in Brno, Brno, Czechia
- Institute for Environmental Studies, Faculty of Science, Charles University in Prague, Prague, Czechia
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27
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Mining of Potential Gene Resources for Breeding Nutritionally Improved Maize. PLANTS 2022; 11:plants11050627. [PMID: 35270097 PMCID: PMC8912576 DOI: 10.3390/plants11050627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2022] [Revised: 02/17/2022] [Accepted: 02/22/2022] [Indexed: 11/16/2022]
Abstract
Maize is one of the leading food crops and its kernel is rich in starch, lipids, protein and other energy substances. In addition, maize kernels also contain many trace elements that are potentially beneficial to human health, such as vitamins, minerals and other secondary metabolites. However, gene resources that could be applied for nutrient improvement are limited in maize. In this review, we summarized 107 genes that are associated with nutrient content from different plant species and identified 246 orthologs from the maize genome. In addition, we constructed physical maps and performed a detailed expression pattern analysis for the 246 maize potential gene resources. Combining expression profiles and their potential roles in maize nutrient improvement, genetic engineering by editing or ectopic expression of these genes in maize are expected to improve resistant starch, oil, essential amino acids, vitamins, iron, zinc and anthocyanin levels of maize grains. Thus, this review provides valuable gene resources for maize nutrient improvement.
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28
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Stanton C, Sanders D, Krämer U, Podar D. Zinc in plants: Integrating homeostasis and biofortification. MOLECULAR PLANT 2022; 15:65-85. [PMID: 34952215 DOI: 10.1016/j.molp.2021.12.008] [Citation(s) in RCA: 51] [Impact Index Per Article: 25.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 12/07/2021] [Accepted: 12/21/2021] [Indexed: 05/24/2023]
Abstract
Zinc plays many essential roles in life. As a strong Lewis acid that lacks redox activity under environmental and cellular conditions, the Zn2+ cation is central in determining protein structure and catalytic function of nearly 10% of most eukaryotic proteomes. While specific functions of zinc have been elucidated at a molecular level in a number of plant proteins, wider issues abound with respect to the acquisition and distribution of zinc by plants. An important challenge is to understand how plants balance between Zn supply in soil and their own nutritional requirement for zinc, particularly where edaphic factors lead to a lack of bioavailable zinc or, conversely, an excess of zinc that bears a major risk of phytotoxicity. Plants are the ultimate source of zinc in the human diet, and human Zn deficiency accounts for over 400 000 deaths annually. Here, we review the current understanding of zinc homeostasis in plants from the molecular and physiological perspectives. We provide an overview of approaches pursued so far in Zn biofortification of crops. Finally, we outline a "push-pull" model of zinc nutrition in plants as a simplifying concept. In summary, this review discusses avenues that can potentially deliver wider benefits for both plant and human Zn nutrition.
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Affiliation(s)
| | - Dale Sanders
- John Innes Centre, Colney Lane, Norwich, NR4 7UH, UK
| | - Ute Krämer
- Molecular Genetics and Physiology of Plants, Ruhr University Bochum, 44801 Bochum, Germany.
| | - Dorina Podar
- Department of Molecular Biology and Biotechnology and Centre for Systems Biology, Biodiversity and Bioresources, Babes-Bolyai University, 400084 Cluj-Napoca, Romania.
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29
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Seregin IV, Kozhevnikova AD. Low-molecular-weight ligands in plants: role in metal homeostasis and hyperaccumulation. PHOTOSYNTHESIS RESEARCH 2021; 150:51-96. [PMID: 32653983 DOI: 10.1007/s11120-020-00768-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 06/22/2020] [Indexed: 06/11/2023]
Abstract
Mineral nutrition is one of the key factors determining plant productivity. In plants, metal homeostasis is achieved through the functioning of a complex system governing metal uptake, translocation, distribution, and sequestration, leading to the maintenance of a regulated delivery of micronutrients to metal-requiring processes as well as detoxification of excess or non-essential metals. Low-molecular-weight ligands, such as nicotianamine, histidine, phytochelatins, phytosiderophores, and organic acids, play an important role in metal transport and detoxification in plants. Nicotianamine and histidine are also involved in metal hyperaccumulation, which determines the ability of some plant species to accumulate a large amount of metals in their shoots. In this review we extensively summarize and discuss the current knowledge of the main pathways for the biosynthesis of these ligands, their involvement in metal uptake, radial and long-distance transport, as well as metal influx, isolation and sequestration in plant tissues and cell compartments. It is analyzed how diverse endogenous ligand levels in plants can determine their different tolerance to metal toxic effects. This review focuses on recent advances in understanding the physiological role of these compounds in metal homeostasis, which is an essential task of modern ionomics and plant physiology. It is of key importance in studying the influence of metal deficiency or excess on various physiological processes, which is a prerequisite to the improvement of micronutrient uptake efficiency and crop productivity and to the development of a variety of applications in phytoremediation, phytomining, biofortification, and nutritional crop safety.
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Affiliation(s)
- I V Seregin
- K.A. Timiryazev Institute of Plant Physiology RAS, IPPRAS, Botanicheskaya st., 35, Moscow, Russian Federation, 127276.
| | - A D Kozhevnikova
- K.A. Timiryazev Institute of Plant Physiology RAS, IPPRAS, Botanicheskaya st., 35, Moscow, Russian Federation, 127276
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30
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Phosphorus Starvation- and Zinc Excess-Induced Astragalus sinicus AsZIP2 Zinc Transporter Is Suppressed by Arbuscular Mycorrhizal Symbiosis. J Fungi (Basel) 2021; 7:jof7110892. [PMID: 34829181 PMCID: PMC8623892 DOI: 10.3390/jof7110892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/19/2021] [Accepted: 10/20/2021] [Indexed: 12/12/2022] Open
Abstract
Zinc (Zn) is one of the most essential micronutrients for plant growth and metabolism, but Zn excess can impair many basic metabolic processes in plant cells. In agriculture, crops often experience low phosphate (Pi) and high Zn double nutrient stresses because of inordinate agro-industrial activities, while the dual benefit of arbuscular mycorrhizal (AM) fungi protects plants from experiencing both deficient and toxic nutrient stresses. Although crosstalk between Pi and Zn nutrients in plants have been extensively studied at the physiological level, the molecular basis of how Pi starvation triggers Zn over-accumulation in plants and how AM plants coordinately modulate the Pi and Zn nutrient homeostasis remains to be elucidated. Here, we report that a novel AsZIP2 gene, a Chinese milk vetch (Astragalus sinicus) member of the ZIP gene family, participates in the interaction between Pi and Zn nutrient homeostasis in plants. Phylogenetic analysis revealed that this AsZIP2 protein was closely related to the orthologous Medicago MtZIP2 and Arabidopsis AtZIP2 transporters. Gene expression analysis indicated that AsZIP2 was highly induced in roots by Pi starvation or Zn excess yet attenuated by arbuscular mycorrhization in a Pi-dependent manner. Subcellular localization and heterologous expression experiments further showed that AsZIP2 encoded a functional plasma membrane-localized transporter that mediated Zn uptake in yeast. Moreover, overexpression of AsZIP2 in A. sinicus resulted in the over-accumulation of Zn concentration in roots at low Pi or excessive Zn concentrations, whereas AsZIP2 silencing lines displayed an even more reduced Zn concentration than control lines under such conditions. Our results reveal that the AsZIP2 transporter functioned in Zn over-accumulation in roots during Pi starvation or high Zn supply but was repressed by AM symbiosis in a Pi-dependent manner. These findings also provide new insights into the AsZIP2 gene acting in the regulation of Zn homeostasis in mycorrhizal plants through Pi signal.
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31
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Sun W, Zhan J, Zheng T, Wu G, Xu H, Chen Y, Yao M, Zeng J, Yan J, Chen H. Involvement of several putative transporters of different families in β-cyclocitral-induced alleviation of cadmium toxicity in quinoa (Chenopodium quinoa) seedlings. JOURNAL OF HAZARDOUS MATERIALS 2021; 419:126474. [PMID: 34186425 DOI: 10.1016/j.jhazmat.2021.126474] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Revised: 06/17/2021] [Accepted: 06/21/2021] [Indexed: 06/13/2023]
Abstract
Cadmium (Cd) has a serious negative impact on crop growth and human food security. This study investigated the alleviating effect of β-cyclocitral, a potential heavy metal barrier, on Cd stress in quinoa seedlings and the associated mechanisms. Our results showed that β-cyclocitral alleviated Cd stress-induced growth inhibition in quinoa seedlings and promoted quinoa seedling root development under Cd stress. Moreover, it maintained the antioxidant system of quinoa seedlings, including the enzymatic, i.e., superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), and nonenzymatic, i.e., reduced glutathione (GSH) and ascorbic acid (ASA), antioxidants, which eliminate the damage from excessive reactive oxygen species (ROS). Our results showed that β-cyclocitral could reduce the amount of Cd absorbed by roots. Furthermore, we systematically identified five transporter families from the quinoa genome, and the RT-qPCR results showed that ZIP, Nramp and YSL gene families were downregulated by β-cyclocitral to reduce Cd uptake by roots. Thus, β-cyclocitral promoted the growth, photosynthetic capacity and antioxidant capacity of the aboveground parts of quinoa seedlings. Taken together, these results suggested that the β-cyclocitral-induced decrease in Cd uptake may be caused by the downregulation of several selected transporter genes.
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Affiliation(s)
- Wenjun Sun
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Junyi Zhan
- College of Life Science, Nanjing Agricultural University, Nanjing 210032, China.
| | - Tianrun Zheng
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Guoming Wu
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Haishen Xu
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Ying Chen
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Min Yao
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Jing Zeng
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China.
| | - Jun Yan
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture Rural Affairs, School of Pharmacy and Bioengineering, Chengdu University, Chengdu 610106, China.
| | - Hui Chen
- College of Life Science, Sichuan Agricultural University, Ya'an 625014, China.
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32
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The Road to Practical Application of Cadmium Phytoremediation Using Rice. PLANTS 2021; 10:plants10091926. [PMID: 34579459 PMCID: PMC8469809 DOI: 10.3390/plants10091926] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/08/2021] [Accepted: 09/09/2021] [Indexed: 11/16/2022]
Abstract
Cadmium (Cd) is a toxic heavy metal that causes severe health issues in humans. Cd accumulates in the human body when foods produced in Cd-contaminated fields are eaten. Therefore, soil remediation of contaminated fields is necessary to provide safe foods. Rice is one of the primary candidates for phytoremediation. There is a genotypic variation of Cd concentration in the shoots and grains of rice. Using the world rice core collection, ‘Jarjan’, ‘Anjana Dhan’, and ‘Cho-ko-koku’ were observed with a significantly higher level of Cd accumulation in the shoots and grains. Moreover, OsHMA3, a heavy metal transporter, was identified as a responsive gene of quantitative trait locus (QTL) for high Cd concentration in the shoots of these three varieties likewise. However, it is difficult to apply practical phytoremediation to these varieties because of their unfavorable agricultural traits, such as shatter and easily lodged. New rice varieties and lines were bred for Cd phytoremediation using OsHMA3 as a DNA marker selection. All of them accumulated Cd in the shoots equal to or higher than ‘Cho-ko-koku’ with improved cultivation traits. Therefore, they can be used for practical Cd phytoremediation.
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Jogawat A, Yadav B, Narayan OP. Metal transporters in organelles and their roles in heavy metal transportation and sequestration mechanisms in plants. PHYSIOLOGIA PLANTARUM 2021; 173:259-275. [PMID: 33586164 DOI: 10.1111/ppl.13370] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 01/23/2021] [Accepted: 02/11/2021] [Indexed: 05/19/2023]
Abstract
Heavy metal toxicity is one of the major concerns for agriculture and health. Accumulation of toxic heavy metals at high concentrations in edible parts of crop plants is the primary cause of disease in humans and cattle. A dramatic increase in industrialization, urbanization, and other high anthropogenic activities has led to the accumulation of heavy metals in agricultural soil, which has consequently disrupted soil conditions and affected crop yield. By now, plants have developed several mechanisms to cope with heavy metal stress. However, not all plants are equally effective in dealing with the toxicity of high heavy metal concentrations. Plants have modified their anatomy, morphophysiology, and molecular networks to survive under changing environmental conditions. Heavy metal sequestration is one of the essential processes evolved by some plants to deal with heavy metals' toxic concentration. Some plants even have the ability to accumulate metals in high quantities in the shoots/organelles without toxic effects. For intercellular and interorganeller metal transport, plants harbor spatially distributed various transporters which mainly help in uptake, translocation, and redistribution of metals. This review discusses different heavy metal transporters in different organelles and their roles in metal sequestration and redistribution to help plants cope with heavy metal stress. A good understanding of the processes at stake helps in developing more tolerant crops without affecting their productivity.
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Affiliation(s)
| | - Bindu Yadav
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
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Kaur R, Das S, Bansal S, Singh G, Sardar S, Dhar H, Ram H. Heavy metal stress in rice: Uptake, transport, signaling, and tolerance mechanisms. PHYSIOLOGIA PLANTARUM 2021; 173:430-448. [PMID: 34227684 DOI: 10.1111/ppl.13491] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 05/06/2021] [Accepted: 06/30/2021] [Indexed: 06/13/2023]
Abstract
Heavy metal contamination of agricultural fields has become a global concern as it causes a direct impact on human health. Rice is the major food crop for almost half of the world population and is grown under diverse environmental conditions, including heavy metal-contaminated soil. In recent years, the impact of heavy metal contamination on rice yield and grain quality has been shown through multiple approaches. In this review article, different aspects of heavy metal stress, that is uptake, transport, signaling and tolerance mechanisms, are comprehensively discussed with special emphasis on rice. For uptake, some of the transporters have specificity to one or two metal ions, whereas many other transporters are able to transport many different ions. After uptake, the intercellular signaling is mediated through different signaling pathways involving the regulation of various hormones, alteration of calcium levels, and the activation of mitogen-activated protein kinases. Heavy metal stress signals from various intermediate molecules activate various transcription factors, which triggers the expression of various antioxidant enzymes. Activated antioxidant enzymes then scavenge various reactive oxygen species, which eventually leads to stress tolerance in plants. Non-enzymatic antioxidants, such as ascorbate, metalloids, and even metal-binding peptides (metallothionein and phytochelatin) can also help to reduce metal toxicity in plants. Genetic engineering has been successfully used in rice and many other crops to increase metal tolerance and reduce heavy metals accumulation. A comprehensive understanding of uptake, transport, signaling, and tolerance mechanisms will help to grow rice plants in agricultural fields with less heavy metal accumulation in grains.
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Affiliation(s)
- Ravneet Kaur
- Agricultural Biotechnology division, National Agri-Food Biotechnology Institute (NABI), Mohali, India
| | - Susmita Das
- Plant Physiology and Biochemistry Laboratory, Department of Botany, University of Calcutta, Kolkata, India
| | - Sakshi Bansal
- Agricultural Biotechnology division, National Agri-Food Biotechnology Institute (NABI), Mohali, India
| | - Gurbir Singh
- Agricultural Biotechnology division, National Agri-Food Biotechnology Institute (NABI), Mohali, India
| | - Shaswati Sardar
- Lab 202, National Institute of Plant Genome Research (NIPGR), New Delhi, India
| | - Hena Dhar
- Agricultural Biotechnology division, National Agri-Food Biotechnology Institute (NABI), Mohali, India
| | - Hasthi Ram
- Lab 202, National Institute of Plant Genome Research (NIPGR), New Delhi, India
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Khoudi H. Significance of vacuolar proton pumps and metal/H + antiporters in plant heavy metal tolerance. PHYSIOLOGIA PLANTARUM 2021; 173:384-393. [PMID: 33937997 DOI: 10.1111/ppl.13447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 04/16/2021] [Accepted: 04/29/2021] [Indexed: 06/12/2023]
Abstract
Soil and water are among the most valuable resources on earth. Unfortunately, their contamination with heavy metals has become a global problem. Heavy metals are not biodegradable and cannot be chemically degraded; therefore, they tend to accumulate in soils or to be transported by streaming water and contaminate both surface and groundwater. Cadmium (Cd) has no known biological function but is one of the most toxic metals. It represents a serious environmental concern since its accumulation in soils is associated with health risks to plants, animals and humans. On the other hand, copper (Cu) and zinc (Zn) are heavy metals that are indispensable to plants but become toxic when their concentration in soils exceeds a certain optimal level. Plants have evolved many mechanisms to cope with heavy metal toxicity; vacuolar sequestration is one of them. Vacuolar sequestration can be achieved through either phytochelatin-dependent or phytochelatin-independent pathways. Most of the transgenic plants meant for phytoremediation described in the literature result from the manipulation of genes involved in the phytochelatin-dependent pathway. However, recent evidence has emerged to support the importance of the phytochelatin-independent pathway in heavy metal sequestration into the vacuole, with metal/H+ antiporters and proton pumps playing an important role. In this review, the importance of vacuolar proton pumps and metal/H+ antiporters transporting Cd, Cu, and Zn is discussed. In addition, the recent advances in the production of transgenic plants with potential application in phytoremediation and food safety through the manipulation of genes encoding V-PPase proton pumps is described.
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Affiliation(s)
- Habib Khoudi
- Laboratory of Plant Biotechnology and Improvement, Center of Biotechnology of Sfax (CBS), University of Sfax, Sfax, Tunisia
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Genome-Wide Identification, Structure Characterization, Expression Pattern Profiling, and Substrate Specificity of the Metal Tolerance Protein Family in Canavalia rosea (Sw.) DC. PLANTS 2021; 10:plants10071340. [PMID: 34209283 PMCID: PMC8309081 DOI: 10.3390/plants10071340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/22/2021] [Accepted: 06/29/2021] [Indexed: 11/16/2022]
Abstract
Plant metal tolerance proteins (MTPs) play key roles in heavy metal absorption and homeostasis in plants. By using genome-wide and phylogenetic approaches, the origin and diversification of MTPs from Canavalia rosea (Sw.) DC. was explored. Canavalia rosea (bay bean) is an extremophile halophyte with strong adaptability to seawater and drought and thereby shows specific metal tolerance with a potential phytoremediation ability. However, MTP genes in leguminous plants remain poorly understood. In our study, a total of 12 MTP genes were identified in C. rosea. Multiple sequence alignments showed that all CrMTP proteins possessed the conserved transmembrane domains (TM1 to TM6) and could be classified into three subfamilies: Zn-CDFs (five members), Fe/Zn-CDFs (five members), and Mn-CDFs (two members). Promoter cis-acting element analyses revealed that a distinct number and composition of heavy metal regulated elements and other stress-responsive elements existed in different promoter regions of CrMTPs. Analysis of transcriptome data revealed organ-specific expression of CrMTP genes and the involvement of this family in heavy metal stress responses and adaptation of C. rosea to extreme coral reef environments. Furthermore, the metal-specific activity of several functionally unknown CrMTPs was investigated in yeast. These results will contribute to uncovering the potential functions and molecular mechanisms of heavy metal absorption, translocation, and accumulation in C. rosea plants.
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Das U, Haque AM, Bari MA, Mandal A, Kabir AH. Computational characterization and expression profile of MTP1 gene associated with zinc homeostasis across dicot plant species. GENE REPORTS 2021. [DOI: 10.1016/j.genrep.2021.101073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Barber-Zucker S, Moran A, Zarivach R. Metal transport mechanism of the cation diffusion facilitator (CDF) protein family - a structural perspective on human CDF (ZnT)-related diseases. RSC Chem Biol 2021; 2:486-498. [PMID: 34458794 PMCID: PMC8341793 DOI: 10.1039/d0cb00181c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 12/26/2020] [Indexed: 11/21/2022] Open
Abstract
Divalent d-block metal cations (DDMCs) participate in many cellular functions; however, their accumulation in cells can be cytotoxic. The cation diffusion facilitator (CDF) family is a ubiquitous family of transmembrane DDMC exporters that ensures their homeostasis. Severe diseases, such as type II diabetes, Parkinson's and Alzheimer's disease, were linked to dysfunctional human CDF proteins, ZnT-1-10 (SLC30A1-10). Each member of the CDF family reduces the cytosolic concentration of a specific DDMC by transporting it from the cytoplasm to the extracellular environment or into intracellular compartments. This process is usually achieved by utilizing the proton motive force. In addition to their activity as DDMC transporters, CDFs also have other cellular functions such as the regulation of ion channels and enzymatic activity. The combination of structural and biophysical studies of different bacterial and eukaryotic CDF proteins led to significant progress in the understanding of the mutual interaction among CDFs and DDMCs, their involvement in ion binding and selectivity, conformational changes and the consequent transporting mechanisms. Here, we review these studies, provide our mechanistic interpretation of CDF proteins based on the current literature and relate the above to known human CDF-related diseases. Our analysis provides a common structure-function relationship to this important protein family and closes the gap between eukaryote and prokaryote CDFs.
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Affiliation(s)
- Shiran Barber-Zucker
- Department of Life Sciences, the National Institute for Biotechnology in the Negev and Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev P.O.B. 653 Beer Sheva 8410501 Israel +972-8-6472970 +972-8-6472970 +972-8-6428447 +972-8-6461999
| | - Arie Moran
- Department of Physiology and Cell Biology, Faculty of Health Sciences, Ben-Gurion University of the Negev P.O.B. 653 Beer Sheva 8410501 Israel
| | - Raz Zarivach
- Department of Life Sciences, the National Institute for Biotechnology in the Negev and Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev P.O.B. 653 Beer Sheva 8410501 Israel +972-8-6472970 +972-8-6472970 +972-8-6428447 +972-8-6461999
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Leng Y, Li Y, Ma YH, He LF, Li SW. Abscisic acid modulates differential physiological and biochemical responses of roots, stems, and leaves in mung bean seedlings to cadmium stress. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:6030-6043. [PMID: 32986195 DOI: 10.1007/s11356-020-10843-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 09/13/2020] [Indexed: 05/22/2023]
Abstract
Experiments were conducted to determine how exogenous abscisic acid (ABA) mediates the tolerance of plants to cadmium (Cd) exposure. Cd stress strongly reduced all the growth parameters of mung bean seedlings. Cd significantly increased ascorbate peroxidase (APX) and catalase (CAT) activities in roots and stems, and peroxidase (POD) activities in roots, stems, and leaves of mung bean seedlings. Cd caused remarkable increases in the levels of leaf chlorophyll and carotenoid, root polyphenols, and malondialdehyde (MDA) and proline in the three organs. However, Cd greatly decreased leaf CAT activity, root and leaf ascorbic acid (AsA) levels, and stem and leaf polyphenol levels. Foliar application of ABA partially alleviated Cd toxicity on the seedlings. ABA could restore most of the changed biochemical parameters caused by Cd, suggesting that ABA played roles in the protection of membrane lipid peroxidation and the modulation of antioxidative defense systems in response to Cd stress. Our results also implied the differential physiological and biochemical responsive patterns of roots, stems, and leaves to Cd and ABA in mung bean seedlings. The great changes in many biochemical parameters in roots suggested that roots were the first to be affected by Cd and play pivotal roles in response to Cd, especially in chelating Cd and reducing Cd absorption.
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Affiliation(s)
- Yan Leng
- School of Chemical and Biological Engineering, School of Environmental and Municipal Engineering, Key Laboratory of Extreme Environmental Microbial Resources and Engineering in Gansu Province, 88 West Anning Road, Lanzhou, 730070, People's Republic of China
| | - Yi Li
- School of Chemical and Biological Engineering, School of Environmental and Municipal Engineering, Key Laboratory of Extreme Environmental Microbial Resources and Engineering in Gansu Province, 88 West Anning Road, Lanzhou, 730070, People's Republic of China
| | - Yan-Hua Ma
- School of Chemical and Biological Engineering, School of Environmental and Municipal Engineering, Key Laboratory of Extreme Environmental Microbial Resources and Engineering in Gansu Province, 88 West Anning Road, Lanzhou, 730070, People's Republic of China
| | - Li-Fang He
- School of Chemical and Biological Engineering, School of Environmental and Municipal Engineering, Key Laboratory of Extreme Environmental Microbial Resources and Engineering in Gansu Province, 88 West Anning Road, Lanzhou, 730070, People's Republic of China
| | - Shi-Weng Li
- School of Chemical and Biological Engineering, School of Environmental and Municipal Engineering, Key Laboratory of Extreme Environmental Microbial Resources and Engineering in Gansu Province, 88 West Anning Road, Lanzhou, 730070, People's Republic of China.
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Papierniak-Wygladala A, Kozak K, Barabasz A, Palusińska M, Całka M, Maślińska K, Antosiewicz DM. Identification and characterization of a tobacco metal tolerance protein, NtMTP2. Metallomics 2020; 12:2049-2064. [PMID: 33169749 DOI: 10.1039/d0mt00210k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Metal tolerance proteins (MTPs) from the CDF (Cation Diffusion Facilitator) family are efflux transporters that play a crucial role in metal homeostasis by maintaining optimal metal concentrations in the cytoplasm. Here, a novel tobacco NtMTP2 transporter was cloned and characterized. It encodes a 512 aa protein containing all specific CDF family domains. A GFP-NtMTP2 fusion protein localizes to the tonoplast in tobacco cells. NtMTP2 expression in yeast conferred tolerance to Co and Ni, indicating that the protein mediates transport of both metals, but not Zn, Mn, Cu, Fe, or Cd. Nonetheless, the expression level was not affected by Co or Ni, except for an increase in leaves at high Co concentrations. Its expression in plant parts remained stable during development, but increased in the leaves of older plants. Analysis of tobacco expressing a promoter-GUS construct indicates that the main sites of promoter activity are the conductive tissue throughout the plant and the palisade parenchyma in leaves. Our results suggest that NtMTP2 is a tonoplast transporter mediating sequestration of Co and Ni into vacuoles and an important housekeeping protein that controls the basal availability of micronutrients and plays a role in the sequestration of metal excess, specifically in leaves.
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Affiliation(s)
- Anna Papierniak-Wygladala
- University of Warsaw, Faculty of Biology, Institute of Experimental Plant Biology and Biotechnology, 1 Miecznikowa Str. 02-096, Warszawa, Poland.
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Liu Y, Lu M, Tao Q, Luo J, Li J, Guo X, Liang Y, Yang X, Li T. A comparative study of root cadmium radial transport in seedlings of two wheat (Triticum aestivum L.) genotypes differing in grain cadmium accumulation. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 266:115235. [PMID: 32707356 DOI: 10.1016/j.envpol.2020.115235] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 07/10/2020] [Accepted: 07/10/2020] [Indexed: 06/11/2023]
Abstract
The radial transport of cadmium (Cd) is essential for Cd influx in roots. The role of radial transport pathway on the Cd translocation from root to shoot among wheat genotypes are still poorly understood. This study explored the role of apoplastic and symplastic pathway on root Cd uptake and root-to-shoot translocation in Zhenmai 10 (ZM10, high Cd in grains) and Aikang 58 (AK58, low Cd in grains). Under Cd treatment, the deposition of Casparian strips (CSs) and suberin lamellae (SL) initiated closer to the root apex in ZM10 than that in AK58, which resulted in the lower Cd concentration in apoplastic fluid of ZM10. Simultaneously, Cd-induced expression levels of genes related to Cd uptake in roots were significantly higher in AK58 by contrast with ZM10, contributing to the symplastic Cd accumulation in AK58 root. Moreover, the addition of metabolic inhibitor CCCP noticeably decreased the Cd accumulation in root of both genotypes. Intriguingly, compared to ZM10, greater amounts of Cd were sequestrated in the cell walls and vacuoles in roots of AK58, limiting the translocation of Cd from root to shoot. Furthermore, the elevated TaHMA2 expression in ZM10 indicates that ZM10 had a higher capacity of xylem loading Cd than AK58. All of these results herein suggest that the radial transport is significant for Cd accumulation in roots, but it cannot explain the difference in root-to-shoot translocation of Cd in wheat genotypes with contrast Cd accumulation in grains.
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Affiliation(s)
- Yuankun Liu
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Min Lu
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Qi Tao
- College of Resources, Sichuan Agricultural University, Chengdu, 611130, 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
| | - Jinxing Li
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xinyu Guo
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Yongchao Liang
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Xiaoe Yang
- Ministry of Education Key Laboratory of Environmental Remediation and Ecological Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058, 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; National Demonstration Center for Experimental Environment and Resources Education, Zhejiang University, Hangzhou, 310058, China.
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Yang M, Li Y, Liu Z, Tian J, Liang L, Qiu Y, Wang G, Du Q, Cheng D, Cai H, Shi L, Xu F, Lian X. A high activity zinc transporter OsZIP9 mediates zinc uptake in rice. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2020; 103:1695-1709. [PMID: 32449251 DOI: 10.1111/tpj.14855] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2020] [Revised: 05/12/2020] [Accepted: 05/15/2020] [Indexed: 05/24/2023]
Abstract
Zinc (Zn) is an essential micronutrient for most organisms including humans, and Zn deficiency is widespread in human populations, particularly in underdeveloped regions. Cereals such as rice (Oryza sativa) are the major dietary source of Zn for most people. However, the molecular mechanism underlying Zn uptake in rice is still not fully understood. Here, we report that a member of the ZIP (ZRT, IRT-like protein) family, OsZIP9, contributes to Zn uptake in rice. It was expressed in the epidermal and exodermal cells of lateral roots, localized in the plasma membrane and induced during Zn deficiency. Yeast-expressed OsZIP9 showed much higher Zn influx transport activity than other rice ZIP proteins in a wide range of Zn concentrations. OsZIP9 knockout rice plants showed a significant reduction in growth at low Zn concentrations, but could be rescued by a high Zn supply. Compared with the wild type, accumulation of Zn in root, shoot and grain was much lower in knockout lines, particularly with a low supply of Zn under both hydroponic and paddy soil conditions. OsZIP9 also showed Co uptake activity. Natural variation of OsZIP9 expression level is highly associated with Zn content in milled grain among rice varieties in the germplasm collection. Taken together, these results show that OsZIP9 is an important influx transporter responsible for the take up of Zn and Co from external media into root cells.
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Affiliation(s)
- Meng Yang
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Shuanshui Shuanglü Institute, Huazhong Agricultural University, Wuhan, 430070, China
- Microelement Research Centre, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yutong Li
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Shuanshui Shuanglü Institute, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zonghao Liu
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Shuanshui Shuanglü Institute, Huazhong Agricultural University, Wuhan, 430070, China
| | - Jingjing Tian
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Shuanshui Shuanglü Institute, Huazhong Agricultural University, Wuhan, 430070, China
| | - Limin Liang
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Shuanshui Shuanglü Institute, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yu Qiu
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Shuanshui Shuanglü Institute, Huazhong Agricultural University, Wuhan, 430070, China
| | - Guangyuan Wang
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Shuanshui Shuanglü Institute, Huazhong Agricultural University, Wuhan, 430070, China
| | - Qingqing Du
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Shuanshui Shuanglü Institute, Huazhong Agricultural University, Wuhan, 430070, China
| | - Deng Cheng
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Shuanshui Shuanglü Institute, Huazhong Agricultural University, Wuhan, 430070, China
| | - Hongmei Cai
- Microelement Research Centre, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, 430070, China
| | - Lei Shi
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Microelement Research Centre, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, 430070, China
| | - Fangsen Xu
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Microelement Research Centre, Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture and Rural Affairs, Huazhong Agricultural University, Wuhan, 430070, China
| | - Xingming Lian
- National Key Laboratory of Crop Genetic Improvement and National Center of Plant Gene Research (Wuhan), Huazhong Agricultural University, Wuhan, 430070, China
- Shuanshui Shuanglü Institute, Huazhong Agricultural University, Wuhan, 430070, China
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Xiao Y, Wu X, Liu D, Yao J, Liang G, Song H, Ismail AM, Luo JS, Zhang Z. Cell Wall Polysaccharide-Mediated Cadmium Tolerance Between Two Arabidopsis thaliana Ecotypes. FRONTIERS IN PLANT SCIENCE 2020; 11:473. [PMID: 32477379 PMCID: PMC7239314 DOI: 10.3389/fpls.2020.00473] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 03/30/2020] [Indexed: 05/07/2023]
Abstract
Cadmium (Cd) is a toxic metal element and the mechanism(s) underlying Cd tolerance in plants are still unclear. Increasingly more studies have been conducted on Cd binding to plant cell walls (CW) but most of them have focused on Cd fixation by CW pectin, and few studies have examined Cd binding to cellulose and hemicellulose. Here we found that Cd binding to CW pectin, cellulose, and hemicellulose was significantly higher in Tor-1, a Cd tolerant A. thaliana ecotype, than in Ph2-23, a sensitive ecotype, as were the concentrations of pectin, cellulose, and hemicellulose. Transcriptome analysis revealed that the genes regulating CW pectin, cellulose, and hemicellulose polysaccharide concentrations in Tor-1 differed significantly from those in Ph2-23. The expressions of most genes such as pectin methyl esterase inhibitors (PMEIs), pectin lyases, xyloglucan endotransglucosylase/hydrolase, expansins (EXPAs), and cellulose hydrolase were higher in Ph2-23, while the expressions of cellulose synthase-like glycosyltransferase 3 (CSLG3) and pectin ethyl esterase 4 (PAE4) were higher in Tor-1. The candidate genes identified here seem to regulate CW Cd fixation by polysaccharides. In conclusion, an increase in pectin demethylation activity, the higher concentration of cellulose and hemicellulose, regulated by related genes, in Tor-1 than in Ph2-23 are likely involved in enhanced Cd CW retention and reduce Cd toxicity.
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Affiliation(s)
- Yan Xiao
- Southern Regional Collaborative Innovation Centre for Grain and Oil Crops in China, College of Resources and Environmental Sciences, Hunan Agricultural University, Changsha, China
- National Centre of Oilseed Crops Improvement, Hunan Branch, Changsha, China
| | - Xiuwen Wu
- Southern Regional Collaborative Innovation Centre for Grain and Oil Crops in China, College of Resources and Environmental Sciences, Hunan Agricultural University, Changsha, China
- National Centre of Oilseed Crops Improvement, Hunan Branch, Changsha, China
| | - Dong Liu
- Southern Regional Collaborative Innovation Centre for Grain and Oil Crops in China, College of Resources and Environmental Sciences, Hunan Agricultural University, Changsha, China
- National Centre of Oilseed Crops Improvement, Hunan Branch, Changsha, China
| | - Junyue Yao
- Southern Regional Collaborative Innovation Centre for Grain and Oil Crops in China, College of Resources and Environmental Sciences, Hunan Agricultural University, Changsha, China
- National Centre of Oilseed Crops Improvement, Hunan Branch, Changsha, China
| | - Guihong Liang
- Southern Regional Collaborative Innovation Centre for Grain and Oil Crops in China, College of Resources and Environmental Sciences, Hunan Agricultural University, Changsha, China
- National Centre of Oilseed Crops Improvement, Hunan Branch, Changsha, China
| | - Haixing Song
- Southern Regional Collaborative Innovation Centre for Grain and Oil Crops in China, College of Resources and Environmental Sciences, Hunan Agricultural University, Changsha, China
- National Centre of Oilseed Crops Improvement, Hunan Branch, Changsha, China
| | | | - Jin-Song Luo
- Southern Regional Collaborative Innovation Centre for Grain and Oil Crops in China, College of Resources and Environmental Sciences, Hunan Agricultural University, Changsha, China
- National Centre of Oilseed Crops Improvement, Hunan Branch, Changsha, China
| | - Zhenhua Zhang
- Southern Regional Collaborative Innovation Centre for Grain and Oil Crops in China, College of Resources and Environmental Sciences, Hunan Agricultural University, Changsha, China
- National Centre of Oilseed Crops Improvement, Hunan Branch, Changsha, China
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Bird AJ, Wilson S. Zinc homeostasis in the secretory pathway in yeast. Curr Opin Chem Biol 2020; 55:145-150. [PMID: 32114317 DOI: 10.1016/j.cbpa.2020.01.011] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 12/14/2019] [Accepted: 01/26/2020] [Indexed: 01/20/2023]
Abstract
It is estimated that up to 10% of proteins in eukaryotes require zinc for their function. Although the majority of these proteins are located in the nucleus and cytosol, a small subset is secreted from cells or is located within an intracellular compartment. As many of these compartmentalized metalloproteins fold to their native state and bind their zinc cofactor inside an organelle, cells require mechanisms to maintain supply of zinc to these compartments even under conditions of zinc deficiency. At the same time, intracellular compartments can also be the site for storing zinc ions, which then can be mobilized when needed. In this review, we highlight insight that has been obtained from yeast models about how zinc homeostasis is maintained in the secretory pathway and vacuole.
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Affiliation(s)
- Amanda J Bird
- Department of Molecular Genetics, The Ohio State University, Columbus, OH, 43210, USA; Department of Human Sciences, The Ohio State University, Columbus, OH, 43210, USA; Center for RNA Biology, The Ohio State University, Columbus, OH, 43210, USA.
| | - Stevin Wilson
- Department of Molecular Genetics, The Ohio State University, Columbus, OH, 43210, USA
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Ram H, Kaur A, Gandass N, Singh S, Deshmukh R, Sonah H, Sharma TR. Molecular characterization and expression dynamics of MTP genes under various spatio-temporal stages and metal stress conditions in rice. PLoS One 2019; 14:e0217360. [PMID: 31136613 PMCID: PMC6538162 DOI: 10.1371/journal.pone.0217360] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Accepted: 05/09/2019] [Indexed: 11/23/2022] Open
Abstract
Metal Tolerance Proteins (MTPs) are the class of membrane proteins involved in the transport of metals, mainly Zn, Mn, Fe, Cd, Co and Ni, and confer metal tolerance in plants. In the present study, a comprehensive molecular analysis of rice MTP genes was performed to understand the evolution, distribution and expression dynamics of MTP genes. Exploration of the whole genome re-sequencing information available for three thousand rice genotypes highlighted the evolution and allelic diversity of MTP genes. Based on the presence of non-synonymous single nucleotide polymorphism (SNP), MTP1, MTP6, MTP8 and MTP9 were found to be the most conserved genes. Furthermore, results showed localization of MTP1, MTP8.1 and MTP9, and MTP11, respectively with QTLs/m-QTLs for Zn and Cd accumulation, making these genes promising candidates to understand the QTL regulation. Expression profiling of the entire set of 10 MTP genes revealed root and shoot specific expressions of MTP9 and MTP8.1, respectively, under all tested vegetative stages. Expression of seed-specific MTPs increased as seed maturation progressed, which revealed their potential role in transporting metals during seed filling. Upon exposure to harmful heavy metals, expression of most MTP genes decreased in root and increased in shoot, suggests that different mechanisms are being employed by MTPs in different tissues. Contrastingly, only a few MTPs were found to be responsive to Fe and/or Zn starvation conditions. The extensive analysis of MTPs presented here will be helpful in identifying candidate MTP genes for crop biofortification and bioremediation purposes.
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Affiliation(s)
- Hasthi Ram
- Department of Agri-Biotechnology, National Agri-Food Biotechnology Institute (NABI), SAS Nagar(Mohali), Punjab, India
| | - Amandeep Kaur
- Department of Agri-Biotechnology, National Agri-Food Biotechnology Institute (NABI), SAS Nagar(Mohali), Punjab, India
| | - Nishu Gandass
- Department of Agri-Biotechnology, National Agri-Food Biotechnology Institute (NABI), SAS Nagar(Mohali), Punjab, India
| | - Shweta Singh
- Department of Agri-Biotechnology, National Agri-Food Biotechnology Institute (NABI), SAS Nagar(Mohali), Punjab, India
| | - Rupesh Deshmukh
- Department of Agri-Biotechnology, National Agri-Food Biotechnology Institute (NABI), SAS Nagar(Mohali), Punjab, India
| | - Humira Sonah
- Department of Agri-Biotechnology, National Agri-Food Biotechnology Institute (NABI), SAS Nagar(Mohali), Punjab, India
| | - Tilak Raj Sharma
- Department of Agri-Biotechnology, National Agri-Food Biotechnology Institute (NABI), SAS Nagar(Mohali), Punjab, India
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Cai H, Huang S, Che J, Yamaji N, Ma JF. The tonoplast-localized transporter OsHMA3 plays an important role in maintaining Zn homeostasis in rice. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:2717-2725. [PMID: 30840766 PMCID: PMC6506766 DOI: 10.1093/jxb/erz091] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 02/13/2019] [Indexed: 05/20/2023]
Abstract
In order to respond to fluctuating zinc (Zn) in the environment, plants must have a system to control Zn homeostasis. However, how plants maintain an appropriate level of Zn during their growth and development is still poorly understood. In this study, we found that OsHMA3, a tonoplast-localized transporter for Zn/Cd, plays an important role in Zn homeostasis in rice. Accessions with the functional allele of OsHMA3 showed greater tolerance to high Zn than those with the non-functional allele based on root elongation test. A 67Zn-labeling experiment showed that accessions with loss of function of OsHMA3 had lower Zn accumulation in the roots but similar concentrations in the shoots compared with functional OsHMA3 accessions. When exposed to Zn-free growing medium, the concentration in the root cell sap was rapidly decreased in accessions with functional OsHMA3, but less dramatic changes were observed in non-functional accessions. A mobility experiment showed that more Zn in the roots was translocated to the shoots in accessions with functional OsHMA3. Higher expression levels of OsZIP4, OsZIP5, OsZIP8, and OsZIP10 were found in the roots of accessions with functional OsHMA3 in response to Zn deficiency. Taken together, our results indicate that OsHMA3 plays an important role in rice roots in both Zn detoxification and storage by sequestration into the vacuoles, depending on Zn concentration in the environment.
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Affiliation(s)
- Hongmei Cai
- Institute of Plant Science and Resources, Okayama University, Chuo, Kurashiki, Japan
- Research Center of Microelement, College of Resources and Environment, Huazhong Agricultural University, Wuhan, China
| | - Sheng Huang
- Institute of Plant Science and Resources, Okayama University, Chuo, Kurashiki, Japan
| | - Jing Che
- Institute of Plant Science and Resources, Okayama University, Chuo, Kurashiki, Japan
| | - Naoki Yamaji
- Institute of Plant Science and Resources, Okayama University, Chuo, Kurashiki, Japan
| | - Jian Feng Ma
- Institute of Plant Science and Resources, Okayama University, Chuo, Kurashiki, Japan
- Correspondence:
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Genome-wide identification and characterization of the metal tolerance protein (MTP) family in grape ( Vitis vinifera L.). 3 Biotech 2019; 9:199. [PMID: 31065499 DOI: 10.1007/s13205-019-1728-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Accepted: 04/24/2019] [Indexed: 12/15/2022] Open
Abstract
Metal tolerance proteins (MTPs) play an important role in the transport of metals at the cellular, tissue and whole plant levels. In the present study, 11 MTP genes were identified and these clustered in three major sub-families Fe/Zn-MTP, Zn-MTP, and Mn-MTP, and seven groups, which are similar to the grouping of MTP genes in both Arabidopsis and rice. Vitis vinifera metal tolerance proteins (VvMTP) ranged from 366 to 1092 amino acids, were predicted to be located in the cell vacuole, and had four to six putative TMDs, except for VvtMTP12 and VvMTP1. The VvMTPs had putative cation diffusion facilitator (CDF) domains and the putative Mn-MTPs also had zinc transporter dimerization domains (ZD-domains). V. vinifera Mn-MTPs had gene structures and motif distributions similar to those of the Fe/Zn-MTP and Zn-MTP sub-families. The upstream regions of VvMTP genes had variable frequencies of cis-regulatory elements that could indicate regulation at different developmental stages and/or differential regulation in response to stress. Comparison of the VvMTP coding sequences with known miRNAs found in various plant species indicated the presence of 13 putative miRNAs, with 7 of these associated with VvMTPs. Temporal and spatial expression profiling indicates a potential role for VvMTP genes during growth and development in grape plants, as well as the involvement of these genes in plant responses to environmental stress, especially osmotic stress. The data generated from this study provides a basis for further investigation of the roles of MTP genes in grapes.
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Liu J, Gao Y, Tang Y, Wang D, Chen X, Yao Y, Guo Y. Genome-Wide Identification, Comprehensive Gene Feature, Evolution, and Expression Analysis of Plant Metal Tolerance Proteins in Tobacco Under Heavy Metal Toxicity. Front Genet 2019; 10:345. [PMID: 31105736 PMCID: PMC6491887 DOI: 10.3389/fgene.2019.00345] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 03/29/2019] [Indexed: 11/13/2022] Open
Abstract
Plant metal tolerance proteins (MTPs) comprise a family of membrane divalent cation transporters that play essential roles in plant mineral nutrition maintenance and heavy metal stresses resistance. However, the evolutionary relationships and biological functions of MTP family in tobacco remain unclear. In the present study, 26, 13, and 12 MTPs in three main Nicotiana species (N. tabacum, N. sylvestris, and N. tomentosiformis) were identified and designated, respectively. The phylogenetic relationships, gene structures, chromosome distributions, conserved motifs, and domains of NtMTPs were systematic analyzed. According to the phylogenetic features, 26 NtMTPs were classified into three major substrate-specific groups that were Zn-cation diffusion facilitators (CDFs), Zn/Fe-CDFs, and Mn-CDFs, and seven primary groups (1, 5, 6, 7, 8, 9, and 12). All of the NtMTPs contained a modified signature sequence and the cation_efflux domain, whereas some of them also harbored the ZT_dimer. Evolutionary analysis showed that NtMTP family of N. tabacum originated from its parental genome of N. sylvestris and N. tomentosiformis, and further underwent gene loss and expanded via one segmental duplication event. Moreover, the prediction of cis-acting elements (CREs) and the microRNA target sites of NtMTP genes suggested the diverse and complex regulatory mechanisms that control NtMTPs gene expression. Expression profile analysis derived from transcriptome data and quantitative real-time reverse transcription-PCR (qRT-PCR) analysis showed that the tissue expression patterns of NtMTPs in the same group were similar but varied among groups. Besides, under heavy metal toxicity, NtMTP genes exhibited various responses in either tobacco leaves or roots. 19 and 15 NtMTPs were found to response to at least one metal ion treatment in leaves and roots, respectively. In addition, NtMTP8.1, NtMTP8.4, and NtMTP11.1 exhibited Mn transport abilities in yeast cells. These results provided a perspective on the evolution of MTP genes in tobacco and were helpful for further functional characterization of NtMTP genes.
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Affiliation(s)
- Jikai Liu
- School of Life Sciences and Engineering, Southwest University of Science and Technology, Mianyang, China.,State Defense Key Laboratory of the Nuclear Waste and Environmental Security, Southwest University of Science and Technology, Mianyang, China
| | - Yongfeng Gao
- School of Life Sciences and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Yunlai Tang
- School of Life Sciences and Engineering, Southwest University of Science and Technology, Mianyang, China.,State Defense Key Laboratory of the Nuclear Waste and Environmental Security, Southwest University of Science and Technology, Mianyang, China
| | - Dan Wang
- School of Life Sciences and Engineering, Southwest University of Science and Technology, Mianyang, China.,State Defense Key Laboratory of the Nuclear Waste and Environmental Security, Southwest University of Science and Technology, Mianyang, China
| | - XiaoMing Chen
- School of Life Sciences and Engineering, Southwest University of Science and Technology, Mianyang, China.,State Defense Key Laboratory of the Nuclear Waste and Environmental Security, Southwest University of Science and Technology, Mianyang, China
| | - Yinan Yao
- School of Life Sciences and Engineering, Southwest University of Science and Technology, Mianyang, China
| | - Yaoling Guo
- School of Life Sciences and Engineering, Southwest University of Science and Technology, Mianyang, China
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Xu T, Chen H, Li J, Hong S, Shao L, Zheng X, Zou Q, Wang Y, Guo S, Jiang J. Implications for Cation Selectivity and Evolution by a Novel Cation Diffusion Facilitator Family Member From the Moderate Halophile Planococcus dechangensis. Front Microbiol 2019; 10:607. [PMID: 30967858 PMCID: PMC6440370 DOI: 10.3389/fmicb.2019.00607] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 03/11/2019] [Indexed: 11/28/2022] Open
Abstract
In the cation diffusion facilitator (CDF) family, the transported substrates are confined to divalent metal ions, such as Zn2+, Fe2+, and Mn2+. However, this study identifies a novel CDF member designated MceT from the moderate halophile Planococcus dechangensis. MceT functions as a Na+(Li+, K+)/H+ antiporter, together with its capability of facilitated Zn2+ diffusion into cells, which have not been reported in any identified CDF transporters as yet. MceT is proposed to represent a novel CDF group, Na-CDF, which shares significantly distant phylogenetic relationship with three known CDF groups including Mn-CDF, Fe/Zn-CDF, and Zn-CDF. Variation of key function-related residues to “Y44-S48-Q150” in two structural motifs explains a significant discrimination in cation selectivity between Na-CDF group and three major known CDF groups. Functional analysis via site-directed mutagenesis confirms that MceT employs Q150, S158, and D184 for the function of MceT as a Na+(Li+, K+)/H+ antiporter, and retains D41, D154, and D184 for its facilitated Zn2+ diffusion into cells. These presented findings imply that MceT has evolved from its native CDF family function to a Na+/H+ antiporter in an evolutionary strategy of the substitution of key conserved residues to “Q150-S158-D184” motif. More importantly, the discovery of MceT contributes to a typical transporter model of CDF family with the unique structural motifs, which will be utilized to explore the cation-selective mechanisms of secondary transporters.
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Affiliation(s)
- Tong Xu
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Huiwen Chen
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Jincheng Li
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Shan Hong
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Li Shao
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Xiutao Zheng
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Qiao Zou
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Yuting Wang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Sijia Guo
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
| | - Juquan Jiang
- Department of Microbiology and Biotechnology, College of Life Sciences, Northeast Agricultural University, Harbin, China
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50
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Qiao K, Wang F, Liang S, Wang H, Hu Z, Chai T. Improved Cd, Zn and Mn tolerance and reduced Cd accumulation in grains with wheat-based cell number regulator TaCNR2. Sci Rep 2019; 9:870. [PMID: 30696904 PMCID: PMC6351596 DOI: 10.1038/s41598-018-37352-6] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 11/07/2018] [Indexed: 02/01/2023] Open
Abstract
Soil microelement deficiency and heavy metal contamination affects plant growth and development, but improving trace element uptake and reducing heavy metal accumulation by genetic breeding can help alleviate this. Cell number regulator 2 (TaCNR2) from common wheat (Triticum aestivum) are similar to plant cadmium resistance proteins, involved with regulating heavy metal translocation. Our aim was to understand the effect of TaCNR2 on heavy metal tolerance and translocation. In this study, real-time quantitative PCR indicated TaCNR2 expression in the wheat seedlings increased under Cd, Zn and Mn treatment. Overexpression of TaCNR2 in Arabidopsis and rice enhanced its stress tolerance to Cd, Zn and Mn, and overexpression in rice improved Cd, Zn and Mn translocation from roots to shoots. The grain husks in overexpressed rice had higher Cd, Zn and Mn concentrations, but the brown rice accumulated less Cd but higher Mn than wild rice. The results showed that TaCNR2 can transport heavy metal ions. Thus, this study provides a novel gene resource for increasing nutrition uptake and reducing toxic metal accumulation in crops.
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Affiliation(s)
- Kun Qiao
- College of Life Science, University of Chinese Academy of Sciences, Beijing, China.,Shenzhen Key Laboratory of Marine Bioresource & Eco-environmental Science, Guangdong Engineering Research Center for Marine Algal Biotechnology, College of Life Science and Oceanography, Shenzhen University, Shenzhen, China
| | - Fanhong Wang
- College of Life Science, University of Chinese Academy of Sciences, Beijing, China
| | - Shuang Liang
- College of Life Science, University of Chinese Academy of Sciences, Beijing, China
| | - Hong Wang
- College of Life Science, University of Chinese Academy of Sciences, Beijing, China
| | - Zhangli Hu
- Shenzhen Key Laboratory of Marine Bioresource & Eco-environmental Science, Guangdong Engineering Research Center for Marine Algal Biotechnology, College of Life Science and Oceanography, Shenzhen University, Shenzhen, China.
| | - Tuanyao Chai
- College of Life Science, University of Chinese Academy of Sciences, Beijing, China. .,Southeast Asia Biodiversity Research Institute, Chinese Academy of Science, Yezin, Nay Pyi Taw, 05282, Myanmar. .,The Innovative Academy of Seed Design (INASEED), Chinese Academy of Sciences, Beijing, China.
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