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Gao P, Han R, Xu H, Wei Y, Yu Y. Identification of MATE Family and Characterization of GmMATE13 and GmMATE75 in Soybean's Response to Aluminum Stress. Int J Mol Sci 2024; 25:3711. [PMID: 38612522 PMCID: PMC11011378 DOI: 10.3390/ijms25073711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 03/22/2024] [Accepted: 03/23/2024] [Indexed: 04/14/2024] Open
Abstract
The multidrug and toxic compound extrusion (MATE) proteins are coding by a secondary transporter gene family, and have been identified to participate in the modulation of organic acid exudation for aluminum (Al) resistance. The soybean variety Glycine max "Tamba" (TBS) exhibits high Al tolerance. The expression patterns of MATE genes in response to Al stress in TBS and their specific functions in the context of Al stress remain elusive. In this study, 124 MATE genes were identified from the soybean genome. The RNA-Seq results revealed significant upregulation of GmMATE13 and GmMATE75 in TBS upon exposure to high-dose Al3+ treatment and both genes demonstrated sequence homology to citrate transporters of other plants. Subcellular localization showed that both proteins were located in the cell membrane. Transgenic complementation experiments of Arabidopsis mutants, atmate, with GmMATE13 or GmMATE75 genes enhanced the Al tolerance of the plant due to citrate secretion. Taken together, this study identified GmMATE13 and GmMATE75 as citrate transporter genes in TBS, which could improve citrate secretion and enhance Al tolerance. Our findings provide genetic resources for the development of plant varieties that are resistant to Al toxicity.
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Affiliation(s)
- Pengxiang Gao
- Center for Plant Environmental Sensing, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China;
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Rongrong Han
- College of Animal Science and Technology, Southwest University, Chongqing 400715, China; (R.H.); (H.X.); (Y.Y.)
| | - Hui Xu
- College of Animal Science and Technology, Southwest University, Chongqing 400715, China; (R.H.); (H.X.); (Y.Y.)
| | - Yunmin Wei
- Center for Plant Environmental Sensing, College of Life Sciences and Oceanography, Shenzhen University, Shenzhen 518060, China;
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
- College of Animal Science and Technology, Southwest University, Chongqing 400715, China; (R.H.); (H.X.); (Y.Y.)
| | - Yongxiong Yu
- College of Animal Science and Technology, Southwest University, Chongqing 400715, China; (R.H.); (H.X.); (Y.Y.)
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2
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Siqueira JA, Silva MF, Wakin T, Nunes-Nesi A, Araújo WL. Metabolic and DNA checkpoints for the enhancement of Al tolerance. JOURNAL OF HAZARDOUS MATERIALS 2022; 430:128366. [PMID: 35168102 DOI: 10.1016/j.jhazmat.2022.128366] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 01/04/2022] [Accepted: 01/24/2022] [Indexed: 06/14/2023]
Abstract
Acidic soils are a major limiting factor for food production in many developing countries. High concentrations of soluble Al cations, particularly Al3+, inhibit cell division and root elongation in plants. Al3+ damages several biomolecules, including DNA, impairing gene expression and cell cycle progression. Notably, the loss-of-function mutants of DNA checkpoints may mediate Al tolerance. Furthermore, mitochondrial organic acids play key roles in neutralizing Al3+ within the cell and around the rhizosphere. Here, we provide knowledge synthesis on interactions between checkpoints related to mitochondrial organic acid homeostasis and DNA integrity mediating Al tolerance in land plants. These interactions, coupled with remarkable advances in tools related to metabolism and cell cycle, may facilitate the development of next-generation productive crops under Al toxicity.
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Affiliation(s)
- João Antonio Siqueira
- Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil
| | - Marcelle Ferreira Silva
- Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil
| | - Thiago Wakin
- Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil
| | - Adriano Nunes-Nesi
- Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil
| | - Wagner L Araújo
- Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-900 Viçosa, MG, Brazil.
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3
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Recent Advances in Understanding Mechanisms of Plant Tolerance and Response to Aluminum Toxicity. SUSTAINABILITY 2021. [DOI: 10.3390/su13041782] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Aluminum (Al) toxicity is a major environmental stress that inhibits plant growth and development. There has been impressive progress in recent years that has greatly increased our understanding of the nature of Al toxicity and its mechanisms of tolerance. This review describes the transcription factors (TFs) and plant hormones involved in the adaptation to Al stress. In particular, it discusses strategies to confer plant resistance to Al stress, such as transgenic breeding, as well as small molecules and plant growth-promoting rhizobacteria (PGPRs) to alleviate Al toxicity. This paper provides a theoretical basis for the enhancement of plant production in acidic soils.
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4
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Wang Y, Yu W, Cao Y, Cai Y, Lyi SM, Wu W, Kang Y, Liang C, Liu J. An exclusion mechanism is epistatic to an internal detoxification mechanism in aluminum resistance in Arabidopsis. BMC PLANT BIOLOGY 2020; 20:122. [PMID: 32188405 PMCID: PMC7079475 DOI: 10.1186/s12870-020-02338-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 03/11/2020] [Indexed: 05/31/2023]
Abstract
BACKGROUND In Arabidopsis, the aluminum (Al) exclusion mechanism is mainly facilitated by ALMT1-mediated malate exudation and MATE-mediated citrate releases from the root. Recently, we have demonstrated that coordinated functioning between an ALMT1-mediated Al exclusion mechanism, via exudation of malate from the root tip, and a NIP1;2-facilitated internal detoxification mechanism, via removal of Al from the root cell wall and subsequent root-to-shoot Al translocation, plays critical roles in achieving overall Al resistance. However, the genetic relationship between ALMT1 and NIP1;2 in these processes remained unclear. RESULTS Through genetic and physiological analyses, we demonstrate that unlike ALMT1 and MATE, which function independently and additively, ALMT1 and NIP1;2 show an epistatic relationship in Al resistance. These results indicate that ALMT1 and NIP1;2 function in the same biochemical pathway, whereas ALMT1 and MATE in different ones. CONCLUSION The establishment of the epistatic relationship and the coordinated functioning between the ALMT1 and NIP1;2-mediated exclusion and internal detoxification mechanisms are pivotal for achieving overall Al resistance in the non-accumulating Arabidopsis plant. We discuss and emphasize the indispensable roles of the root cell wall for the implementation of the Al exclusion mechanism and for the establishment of an epistatic relationship between the ALMT1-mediated exclusion mechanism and the NIP1;2-facilitated internal detoxification mechanism.
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Affiliation(s)
- Yuqi Wang
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, Guangdong, China
- Robert Holley Center, US Department of Agriculture, Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
| | - Wancong Yu
- Robert Holley Center, US Department of Agriculture, Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
- Medical Plant Laboratory, Tianjin Research Center of Agricultural Biotechnology, Tianjin, 300384, China
| | - Yu Cao
- Robert Holley Center, US Department of Agriculture, Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Yanfei Cai
- Robert Holley Center, US Department of Agriculture, Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Sangbom M Lyi
- Robert Holley Center, US Department of Agriculture, Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
| | - Weiwei Wu
- Robert Holley Center, US Department of Agriculture, Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Yan Kang
- Robert Holley Center, US Department of Agriculture, Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
- School of Life Sciences, Inner Mongolia University, Hohhot, 010021, Inner Mongolia, China
| | - Cuiyue Liang
- Robert Holley Center, US Department of Agriculture, Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA
- College of Natural Resources and Environment, South China Agricultural University, Guangzhou, 510642, Guangdong, China
| | - Jiping Liu
- Robert Holley Center, US Department of Agriculture, Agricultural Research Service, Cornell University, Ithaca, NY, 14853, USA.
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Yang JL, Fan W, Zheng SJ. Mechanisms and regulation of aluminum-induced secretion of organic acid anions from plant roots. J Zhejiang Univ Sci B 2019; 20:513-527. [PMID: 31090277 DOI: 10.1631/jzus.b1900188] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Aluminum (Al) is the most abundant metal element in the earth's crust. On acid soils, at pH 5.5 or lower, part of insoluble Al-containing minerals become solubilized into soil solution, with resultant highly toxic effects on plant growth and development. Nevertheless, some plants have developed Al-tolerance mechanisms that enable them to counteract this Al toxicity. One such well-documented mechanism is the Al-induced secretion of organic acid anions, including citrate, malate, and oxalate, from plant roots. Once secreted, these anions chelate external Al ions, thus protecting the secreting plant from Al toxicity. Genes encoding the citrate and malate transporters responsible for secretion have been identified and characterized, and accumulating evidence indicates that regulation of the expression of these transporter genes is critical for plant Al tolerance. In this review, we outline the recent history of research into plant Al-tolerance mechanisms, with special emphasis on the physiology of Al-induced secretion of organic acid anions from plant roots. In particular, we summarize the identification of genes encoding organic acid transporters and review current understanding of genes regulating organic acid secretion. We also discuss the possible signaling pathways regulating the expression of organic acid transporter genes.
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Affiliation(s)
- Jian-Li Yang
- Institute of Plant Biology, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Wei Fan
- Laboratory of Agricultural Resources and Environment, College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China
| | - Shao-Jian Zheng
- Institute of Plant Biology, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
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6
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Pereira JF, Ryan PR. The role of transposable elements in the evolution of aluminium resistance in plants. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:41-54. [PMID: 30325439 DOI: 10.1093/jxb/ery357] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Accepted: 10/02/2018] [Indexed: 05/20/2023]
Abstract
Aluminium (Al) toxicity can severely reduce root growth and consequently affect plant development and yield. A mechanism by which many species resist the toxic effects of Al relies on the efflux of organic anions (OAs) from the root apices via OA transporters. Several of the genes encoding these OA transporters contain transposable elements (TEs) in the coding sequences or in flanking regions. Some of the TE-induced mutations impact Al resistance by modifying the level and/or location of gene expression so that OA efflux from the roots is increased. The importance of genomic modifications for improving the adaptation of plants to acid soils has been raised previously, but the growing number of examples linking TEs with these changes requires highlighting. Here, we review the role of TEs in creating genetic modifications that enhance the adaptation of plants to acid soils by increasing the release of OAs from the root apices. We argue that TEs have been an important source of beneficial mutations that have co-opted OA transporter proteins with other functions to perform this role. These changes have occurred relatively recently in the evolution of many species and likely facilitated their expansion into regions with acidic soils.
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Affiliation(s)
| | - Peter R Ryan
- CSIRO Agriculture and Food, Canberra, ACT, Australia
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7
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Repeat variants for the SbMATE transporter protect sorghum roots from aluminum toxicity by transcriptional interplay in cis and trans. Proc Natl Acad Sci U S A 2018; 116:313-318. [PMID: 30545913 DOI: 10.1073/pnas.1808400115] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Acidic soils, where aluminum (Al) toxicity is a major agricultural constraint, are globally widespread and are prevalent in developing countries. In sorghum, the root citrate transporter SbMATE confers Al tolerance by protecting root apices from toxic Al3+, but can exhibit reduced expression when introgressed into different lines. We show that allele-specific SbMATE transactivation occurs and is caused by factors located away from SbMATE Using expression-QTL mapping and expression genome-wide association mapping, we establish that SbMATE transcription is controlled in a bipartite fashion, primarily in cis but also in trans Multiallelic promoter transactivation and ChIP analyses demonstrated that intermolecular effects on SbMATE expression arise from a WRKY and a zinc finger-DHHC transcription factor (TF) that bind to and trans-activate the SbMATE promoter. A haplotype analysis in sorghum RILs indicates that the TFs influence SbMATE expression and Al tolerance. Variation in SbMATE expression likely results from changes in tandemly repeated cis sequences flanking a transposable element (a miniature inverted repeat transposable element) insertion in the SbMATE promoter, which are recognized by the Al3+-responsive TFs. According to our model, repeat expansion in Al-tolerant genotypes increases TF recruitment and, hence, SbMATE expression, which is, in turn, lower in Al-sensitive genetic backgrounds as a result of lower TF expression and fewer binding sites. We thus show that even dominant cis regulation of an agronomically important gene can be subjected to precise intermolecular fine-tuning. These concerted cis/trans interactions, which allow the plant to sense and respond to environmental cues, such as Al3+ toxicity, can now be used to increase yields and food security on acidic soils.
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8
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Magalhaes JV, Piñeros MA, Maciel LS, Kochian LV. Emerging Pleiotropic Mechanisms Underlying Aluminum Resistance and Phosphorus Acquisition on Acidic Soils. FRONTIERS IN PLANT SCIENCE 2018; 9:1420. [PMID: 30319678 PMCID: PMC6168647 DOI: 10.3389/fpls.2018.01420] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 09/06/2018] [Indexed: 05/25/2023]
Abstract
Aluminum (Al) toxicity on acidic soils significantly damages plant roots and inhibits root growth. Hence, crops intoxicated by Al become more sensitive to drought stress and mineral nutrient deficiencies, particularly phosphorus (P) deficiency, which is highly unavailable on tropical soils. Advances in our understanding of the physiological and genetic mechanisms that govern plant Al resistance have led to the identification of Al resistance genes, both in model systems and in crop species. It has long been known that Al resistance has a beneficial effect on crop adaptation to acidic soils. This positive effect happens because the root systems of Al resistant plants show better development in the presence of soil ionic Al3+ and are, consequently, more efficient in absorbing sub-soil water and mineral nutrients. This effect of Al resistance on crop production, by itself, warrants intensified efforts to develop and implement, on a breeding scale, modern selection strategies to profit from the knowledge of the molecular determinants of plant Al resistance. Recent studies now suggest that Al resistance can exert pleiotropic effects on P acquisition, potentially expanding the role of Al resistance on crop adaptation to acidic soils. This appears to occur via both organic acid (OA)- and non-OA transporters governing a joint, iron-dependent interplay between Al resistance and enhanced P uptake, via changes in root system architecture. Current research suggests this interplay to be part of a P stress response, suggesting that this mechanism could have evolved in crop species to improve adaptation to acidic soils. Should this pleiotropism prove functional in crop species grown on acidic soils, molecular breeding based on Al resistance genes may have a much broader impact on crop performance than previously anticipated. To explore this possibility, here we review the components of this putative effect of Al resistance genes on P stress responses and P nutrition to provide the foundation necessary to discuss the recent evidence suggesting pleiotropy as a genetic linkage between Al resistance and P efficiency. We conclude by exploring what may be needed to enhance the utilization of Al resistance genes to improve crop production on acidic soils.
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Affiliation(s)
- Jurandir V. Magalhaes
- Embrapa Maize and Sorghum, Sete Lagoas, Brazil
- Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Miguel A. Piñeros
- Robert W. Holley Center for Agriculture and Health, USDA-ARS, Cornell University, Ithaca, NY, United States
| | - Laiane S. Maciel
- Embrapa Maize and Sorghum, Sete Lagoas, Brazil
- Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Leon V. Kochian
- Global Institute for Food Security, University of Saskatchewan, Saskatoon, SK, Canada
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9
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Hufnagel B, Guimaraes CT, Craft EJ, Shaff JE, Schaffert RE, Kochian LV, Magalhaes JV. Exploiting sorghum genetic diversity for enhanced aluminum tolerance: Allele mining based on the Alt SB locus. Sci Rep 2018; 8:10094. [PMID: 29973700 PMCID: PMC6031643 DOI: 10.1038/s41598-018-27817-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 06/07/2018] [Indexed: 01/06/2023] Open
Abstract
Root damage due to aluminum (Al) toxicity restricts crop production on acidic soils, which are extensive in the tropics. The sorghum root Al-activated citrate transporter, SbMATE, underlies the Al tolerance locus, AltSB, and increases grain yield under Al toxicity. Here, AltSB loci associated with Al tolerance were converted into Amplification Refractory Mutation System (ARMS) markers, which are cost effective and easy to use. A DNA pooling strategy allowed us to identify accessions harboring rare favorable AltSB alleles in three germplasm sets while greatly reducing genotyping needs. Population structure analysis revealed that favorable AltSB alleles are predominantly found in subpopulations enriched with guinea sorghums, supporting a possible Western African origin of AltSB. The efficiency of allele mining in recovering Al tolerance accessions was the highest in the largest and highly diverse germplasm set, with a 10-fold reduction in the number of accessions that would need to be phenotyped in the absence of marker information. Finally, Al tolerant accessions were found to rely on SbMATE to exclude Al3+ from sensitive sites in the root apex. This study emphasizes gene-specific markers as important tools for efficiently mining useful rare alleles in diverse germplasm, bridging genetic resource conservation efforts and pre-breeding for Al tolerance.
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Affiliation(s)
- Barbara Hufnagel
- Embrapa Maize and Sorghum, Sete Lagoas, MG, Brazil.,Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil.,Centre National de la Recherche Scientifique, Biochimie et Physiologie Moléculaire des Plantes, Montpellier SupAgro, 2 Place Pierre Viala, 34060, Montpellier, France
| | - Claudia T Guimaraes
- Embrapa Maize and Sorghum, Sete Lagoas, MG, Brazil.,Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil
| | - Eric J Craft
- Robert W. Holley Center of Agriculture and health, USDA-ARS, Cornell University, Ithaca, New York, USA
| | - Jon E Shaff
- Robert W. Holley Center of Agriculture and health, USDA-ARS, Cornell University, Ithaca, New York, USA
| | | | - Leon V Kochian
- Global Institute for Food Security, University of Saskatchewan, Saskatoon, SK, S7N 4J8, Canada
| | - Jurandir V Magalhaes
- Embrapa Maize and Sorghum, Sete Lagoas, MG, Brazil. .,Departamento de Biologia Geral, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 31270-901, Brazil.
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10
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Doshi R, McGrath AP, Piñeros M, Szewczyk P, Garza DM, Kochian LV, Chang G. Functional characterization and discovery of modulators of SbMATE, the agronomically important aluminium tolerance transporter from Sorghum bicolor. Sci Rep 2017; 7:17996. [PMID: 29269936 PMCID: PMC5740117 DOI: 10.1038/s41598-017-18146-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 12/01/2017] [Indexed: 12/18/2022] Open
Abstract
About 50% of the world's arable land is strongly acidic (pH ≤ 5). The low pH solubilizes root-toxic ionic aluminium (Al3+) species from clay minerals, driving the evolution of counteractive adaptations in cultivated crops. The food crop Sorghum bicolor upregulates the membrane-embedded transporter protein SbMATE in its roots. SbMATE mediates efflux of the anionic form of the organic acid, citrate, into the soil rhizosphere, chelating Al3+ ions and thereby imparting Al-resistance based on excluding Al+3 from the growing root tip. Here, we use electrophysiological, radiolabeled, and fluorescence-based transport assays in two heterologous expression systems to establish a broad substrate recognition profile of SbMATE, showing the proton and/or sodium-driven transport of 14C-citrate anion, as well as the organic monovalent cation, ethidium, but not its divalent analog, propidium. We further complement our transport assays by measuring substrate binding to detergent-purified SbMATE protein. Finally, we use the purified membrane protein as an antigen to discover native conformation-binding and transport function-altering nanobodies using an animal-free, mRNA/cDNA display technology. Our results demonstrate the utility of using Pichia pastoris as an efficient eukaryotic host to express large quantities of functional plant transporter proteins. The nanobody discovery approach is applicable to other non-immunogenic plant proteins.
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Affiliation(s)
- Rupak Doshi
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California, USA.,InhibRx LLP, 11099 N Torrey Pines Rd., Suite 280, La Jolla, San Diego, CA, 92037, USA.,Department of Electrical Engineering and Computer Science, University of California, Irvine, 2213 Engineering Hall, Irvine, CA, 92697-2625, USA
| | - Aaron P McGrath
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California, USA
| | - Miguel Piñeros
- Robert W. Holley Center for Agriculture and Health, United States Department of Agriculture-Agricultural Research Service, Cornell University, Ithaca, NY, USA
| | - Paul Szewczyk
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California, USA.,Cancer Metabolism and Signaling Networks Program, Sanford-Burnham Prebys Medical Discovery Institute, La Jolla, California, 92037, United States
| | - Denisse M Garza
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California, USA
| | - Leon V Kochian
- Global Institute for Food Security, University of Saskatchewan, Saskatoon, Canada
| | - Geoffrey Chang
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California at San Diego, La Jolla, California, USA. .,Department of Pharmacology, School of Medicine, University of California at San Diego, La Jolla, California, USA.
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11
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Arbelaez JD, Maron LG, Jobe TO, Piñeros MA, Famoso AN, Rebelo AR, Singh N, Ma Q, Fei Z, Kochian LV, McCouch SR. ALUMINUM RESISTANCE TRANSCRIPTION FACTOR 1 ( ART1) contributes to natural variation in aluminum resistance in diverse genetic backgrounds of rice ( O. sativa). PLANT DIRECT 2017; 1:e00014. [PMID: 31245663 PMCID: PMC6508803 DOI: 10.1002/pld3.14] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 08/22/2017] [Accepted: 09/01/2017] [Indexed: 05/13/2023]
Abstract
Transcription factors (TFs) regulate the expression of other genes to indirectly mediate stress resistance mechanisms. Therefore, when studying TF-mediated stress resistance, it is important to understand how TFs interact with genes in the genetic background. Here, we fine-mapped the aluminum (Al) resistance QTL Alt12.1 to a 44-kb region containing six genes. Among them is ART1, which encodes a C2H2-type zinc finger TF required for Al resistance in rice. The mapping parents, Al-resistant cv Azucena (tropical japonica) and Al-sensitive cv IR64 (indica), have extensive sequence polymorphism within the ART1 coding region, but similar ART1 expression levels. Using reciprocal near-isogenic lines (NILs) we examined how allele-swapping the Alt12.1 locus would affect plant responses to Al. Analysis of global transcriptional responses to Al stress in roots of the NILs alongside their recurrent parents demonstrated that the presence of the Alt12.1 from Al-resistant Azucena led to greater changes in gene expression in response to Al when compared to the Alt12.1 from IR64 in both genetic backgrounds. The presence of the ART1 allele from the opposite parent affected the expression of several genes not previously implicated in rice Al tolerance. We highlight examples where putatively functional variation in cis-regulatory regions of ART1-regulated genes interacts with ART1 to determine gene expression in response to Al. This ART1-promoter interaction may be associated with transgressive variation for Al resistance in the Azucena × IR64 population. These results illustrate how ART1 interacts with the genetic background to contribute to quantitative phenotypic variation in rice Al resistance.
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Affiliation(s)
- Juan D. Arbelaez
- Plant Breeding and Genetics SectionSchool of Integrative Plant ScienceCornell UniversityIthacaNYUSA
- Present address:
Plant BreedingInternational Rice Research InstituteLos BañosPhilippines
| | - Lyza G. Maron
- Plant Breeding and Genetics SectionSchool of Integrative Plant ScienceCornell UniversityIthacaNYUSA
| | - Timothy O. Jobe
- Plant Breeding and Genetics SectionSchool of Integrative Plant ScienceCornell UniversityIthacaNYUSA
- Boyce Thompson InstituteCornell UniversityIthacaNYUSA
- Present address:
Botanical InstituteUniversity of CologneCologneGermany
| | - Miguel A. Piñeros
- Robert W. Holley Center for Agriculture and HealthUSDA‐ARSCornell UniversityIthacaNYUSA
| | - Adam N. Famoso
- Plant Breeding and Genetics SectionSchool of Integrative Plant ScienceCornell UniversityIthacaNYUSA
- Present address:
LSU AgCenterH. Rouse Caffey Rice Research StationRayneLAUSA
| | - Ana Rita Rebelo
- Plant Breeding and Genetics SectionSchool of Integrative Plant ScienceCornell UniversityIthacaNYUSA
- Present address:
Boyce Thompson InstituteCornell UniversityIthacaNYUSA
| | - Namrata Singh
- Plant Breeding and Genetics SectionSchool of Integrative Plant ScienceCornell UniversityIthacaNYUSA
| | - Qiyue Ma
- Boyce Thompson InstituteCornell UniversityIthacaNYUSA
| | - Zhangjun Fei
- Boyce Thompson InstituteCornell UniversityIthacaNYUSA
| | - Leon V. Kochian
- Robert W. Holley Center for Agriculture and HealthUSDA‐ARSCornell UniversityIthacaNYUSA
- Present address:
Global Institute for Food SecurityUniversity of SaskatchewanSaskatoonSKCanada
| | - Susan R. McCouch
- Plant Breeding and Genetics SectionSchool of Integrative Plant ScienceCornell UniversityIthacaNYUSA
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12
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Differential Physiological Responses of Portuguese Bread Wheat (Triticum aestivum L.) Genotypes under Aluminium Stress. DIVERSITY 2016. [DOI: 10.3390/d8040026] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Chen ZC, Liao H. Organic acid anions: An effective defensive weapon for plants against aluminum toxicity and phosphorus deficiency in acidic soils. J Genet Genomics 2016; 43:631-638. [PMID: 27890545 DOI: 10.1016/j.jgg.2016.11.003] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 07/21/2016] [Accepted: 11/07/2016] [Indexed: 11/28/2022]
Abstract
Aluminum (Al) toxicity and phosphorous (P) deficiency are two major limiting factors for plant growth on acidic soils. Thus, the physiological mechanisms for Al tolerance and P acquisition have been intensively studied. A commonly observed trait is that plants have developed the ability to utilize organic acid anions (OAs; mainly malate, citrate and oxalate) to combat Al toxicity and P deficiency. OAs secreted by roots into the rhizosphere can externally chelate Al3+ and mobilize phosphate (Pi), while OAs synthesized in the cell can internally sequester Al3+ into the vacuole and release free Pi for metabolism. Molecular mechanisms involved in OA synthesis and transport have been described in detail. Ensuing genetic improvement for Al tolerance and P efficiency through increased OA exudation and/or synthesis in crops has been achieved by transgenic and marker-assisted breeding. This review mainly elucidates the crucial roles of OAs in plant Al tolerance and P efficiency through summarizing associated physiological mechanisms, molecular traits and genetic manipulation of crops.
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Affiliation(s)
- Zhi Chang Chen
- Root Biology Center, Fujian Agriculture and Forestry University, Fujian, Fuzhou 350002, China
| | - Hong Liao
- Root Biology Center, Fujian Agriculture and Forestry University, Fujian, Fuzhou 350002, China.
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Kwon T. Mitochondrial Porin Isoform AtVDAC1 Regulates the Competence of Arabidopsis thaliana to Agrobacterium-Mediated Genetic Transformation. Mol Cells 2016; 39:705-13. [PMID: 27643450 PMCID: PMC5050536 DOI: 10.14348/molcells.2016.0159] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 08/08/2016] [Accepted: 08/11/2016] [Indexed: 11/27/2022] Open
Abstract
The efficiency of Agrobacterium-mediated transformation in plants depends on the virulence of Agrobacterium strains, the plant tissue culture conditions, and the susceptibility of host plants. Understanding the molecular interactions between Agrobacterium and host plant cells is crucial when manipulating the susceptibility of recalcitrant crop plants and protecting orchard trees from crown gall disease. It was discovered that Arabidopsis voltage-dependent anion channel 1 (atvdac1) mutant has drastic effects on Agrobacterium-mediated tumorigenesis and growth developmental phenotypes, and that these effects are dependent on a Ws-0 genetic background. Genetic complementation of Arabidopsis vdac1 mutants and yeast porin1-deficient strain with members of the AtVDAC gene family revealed that AtVDAC1 is required for Agrobacterium-mediated transformation, and there is weak functional redundancy between AtVDAC1 and AtVDAC3, which is independent of porin activity. Furthermore, atvdac1 mutants were deficient in transient and stable transformation by Agrobacterium, suggesting that AtVDAC1 is involved in the early stages of Agrobacterium infection prior to transferred-DNA (T-DNA) integration. Transgenic plants overexpressing AtVDAC1 not only complemented the phenotypes of the atvdac1 mutant, but also showed high efficiency of transient T-DNA gene expression; however, the efficiency of stable transformation was not affected. Moreover, the effect of phytohormone treatment on competence to Agrobacterium was compromised in atvdac1 mutants. These data indicate that AtVDAC1 regulates the competence of Arabidopsis to Agrobacterium infection.
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Affiliation(s)
- Tackmin Kwon
- Institute of Agricultural Life Sciences, Dong-A University, Busan 49315,
Korea
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Yokosho K, Yamaji N, Fujii-Kashino M, Ma JF. Functional Analysis of a MATE Gene OsFRDL2 Revealed its Involvement in Al-Induced Secretion of Citrate, but a Lower Contribution to Al Tolerance in Rice. PLANT & CELL PHYSIOLOGY 2016; 57:976-85. [PMID: 26872836 DOI: 10.1093/pcp/pcw026] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 01/25/2016] [Indexed: 05/22/2023]
Abstract
The multidrug and toxic compound extrusion (MATE) transporters represent a large transporter family in plants, but the role of most genes in this family has not been examined. We functionally characterized a MATE family member, OsFRDL2, in rice (Oryza sativa). OsFRDL2 showed an efflux transport activity for citrate when it was expressed in both Xenopus oocytes and cultured tobacco cells. OsFRDL2 was mainly expressed in the roots and its expression was not induced by iron (Fe) deficiency, but it was rapidly up-regulated by aluminum (Al). Furthermore, the expression of OsFRDL2 was regulated by ART1, a C2H2-type zinc-finger transcription factor for Al tolerance. OsFRDL2 protein was localized at unidentified vesicles in the cytosol, but not co-localized with either mitochondria or peroxisomes when expressed in both onion epidermal cells and cultured tobacco cells. Knockout of OsFRDL2 decreased Al-induced secretion of citrate from the roots, but did not affect the internal citrate concentration. The Al-induced inhibition of root elongation was similar between the OsFRDL2 knockout line and its wild-type rice. Knockout of OsFRDL2 did not affect the translocation of Fe from the roots to the shoots. A double mutant between osfrdl2 and osfrdl4 or osfrdl1 did not further decrease the Al-induced citrate secretion and Fe translocation compared with the single mutant. Collectively, our results indicate that although OsFRDL2 is involved in the Al-induced secretion of citrate, its contribution to high Al tolerance is relatively small in rice.
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Affiliation(s)
- Kengo Yokosho
- Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki, 710-0046 Japan
| | - Naoki Yamaji
- Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki, 710-0046 Japan
| | - Miho Fujii-Kashino
- Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki, 710-0046 Japan
| | - Jian Feng Ma
- Institute of Plant Science and Resources, Okayama University, Chuo 2-20-1, Kurashiki, 710-0046 Japan
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Back to Acid Soil Fields: The Citrate Transporter SbMATE Is a Major Asset for Sustainable Grain Yield for Sorghum Cultivated on Acid Soils. G3-GENES GENOMES GENETICS 2015; 6:475-84. [PMID: 26681519 PMCID: PMC4751565 DOI: 10.1534/g3.115.025791] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Aluminum (Al) toxicity damages plant roots and limits crop production on acid soils, which comprise up to 50% of the world’s arable lands. A major Al tolerance locus on chromosome 3, AltSB, controls aluminum tolerance in sorghum [Sorghum bicolor (L.) Moench] via SbMATE, an Al-activated plasma membrane transporter that mediates Al exclusion from sensitive regions in the root apex. As is the case with other known Al tolerance genes, SbMATE was cloned based on studies conducted under controlled environmental conditions, in nutrient solution. Therefore, its impact on grain yield on acid soils remains undetermined. To determine the real world impact of SbMATE, multi-trait quantitative trait loci (QTL) mapping in hydroponics, and, in the field, revealed a large-effect QTL colocalized with the Al tolerance locus AltSB, where SbMATE lies, conferring a 0.6 ton ha–1 grain yield increase on acid soils. A second QTL for Al tolerance in hydroponics, where the positive allele was also donated by the Al tolerant parent, SC283, was found on chromosome 9, indicating the presence of distinct Al tolerance genes in the sorghum genome, or genes acting in the SbMATE pathway leading to Al-activated citrate release. There was no yield penalty for AltSB, consistent with the highly localized Al regulated SbMATE expression in the root tip, and Al-dependent transport activity. A female effect of 0.5 ton ha–1 independently demonstrated the effectiveness of AltSB in hybrids. Al tolerance conferred by AltSB is thus an indispensable asset for sorghum production and food security on acid soils, many of which are located in developing countries.
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17
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Transcriptional Regulation of Al Tolerance in Plants. ALUMINUM STRESS ADAPTATION IN PLANTS 2015. [DOI: 10.1007/978-3-319-19968-9_2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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Kochian LV, Piñeros MA, Liu J, Magalhaes JV. Plant Adaptation to Acid Soils: The Molecular Basis for Crop Aluminum Resistance. ANNUAL REVIEW OF PLANT BIOLOGY 2015; 66:571-98. [PMID: 25621514 DOI: 10.1146/annurev-arplant-043014-114822] [Citation(s) in RCA: 429] [Impact Index Per Article: 47.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Aluminum (Al) toxicity in acid soils is a significant limitation to crop production worldwide, as approximately 50% of the world's potentially arable soil is acidic. Because acid soils are such an important constraint to agriculture, understanding the mechanisms and genes conferring resistance to Al toxicity has been a focus of intense research interest in the decade since the last article on crop acid soil tolerance was published in this journal. An impressive amount of progress has been made during that time that has greatly increased our understanding of the diversity of Al resistance genes and mechanisms, how resistance gene expression is regulated and triggered by Al and Al-induced signals, and how the proteins encoded by these genes function and are regulated. This review examines the state of our understanding of the physiological, genetic, and molecular bases for crop Al tolerance, looking at the novel Al resistance genes and mechanisms that have been identified over the past ten years. Additionally, it examines how the integration of molecular and genetic analyses of crop Al resistance is starting to be exploited for the improvement of crop plants grown on acid soils via both molecular-assisted breeding and biotechnology approaches.
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Affiliation(s)
- Leon V Kochian
- Robert W. Holley Center for Agriculture and Health, USDA-ARS, Cornell University, Ithaca, New York 14853; , ,
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Garcia-Oliveira AL, Martins-Lopes P, Tolrá R, Poschenrieder C, Tarquis M, Guedes-Pinto H, Benito C. Molecular characterization of the citrate transporter gene TaMATE1 and expression analysis of upstream genes involved in organic acid transport under Al stress in bread wheat (Triticum aestivum). PHYSIOLOGIA PLANTARUM 2014; 152:441-52. [PMID: 24588850 DOI: 10.1111/ppl.12179] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 01/27/2014] [Accepted: 01/28/2014] [Indexed: 05/25/2023]
Abstract
In bread wheat, besides malate, the importance of citrate efflux for Al tolerance has also been reported. For better understanding the Al tolerance mechanism in bread wheat, here, we performed both a molecular characterization of the citrate transporter gene TaMATE1 and an investigation on the upstream variations in citrate and malate transporter genes. TaMATE1 belong to multidrug transporter protein family, which are located on the long arm of homoeologous group 4 chromosomes (TaMATE1-4A, TaMATE1-4B TaMATE1-4D). TaMATE1 homoeologues transcript expression study exhibited the preponderance of homoeologue TaMATE1-4B followed by TaMATE1-4D whereas homoeologue TaMATE1-4A seemed to be silenced. TaMATE1, particularly homoeologue TaMATE1-4B and TaALMT1 transcripts were much more expressed in the root apices than in shoots of Al tolerant genotype Barbela 7/72/92 under both control and Al stress conditions. In addition, in both tissues of Barbela 7/72/92, higher basal levels of these gene transcripts were observed than in Anahuac (Al sensitive). Noticeably, the presence of a transposon in the upstream of TaMATE1-4B in Barbela 7/72/92 seems to be responsible for its higher transcript expression where it may confer citrate efflux. Thus, promoter variations (transposon in TaMATE1-4B upstream and type VI promoter in TaALMT1) associated with higher basal transcript expression of TaMATE1-4B and TaALMT1 clearly show how different mechanisms for Al tolerance operate simultaneously in a single genotype. In conclusion, our results demonstrate that Barbela 7/72/92 has favorable alleles for these organic acids transporter genes which could be utilized through genomic assisted selection to develop improved cultivars for acidic soils.
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Affiliation(s)
- Ana Luísa Garcia-Oliveira
- Centro de Genómica e Biotecnologia, Instituto de Biotecnologia e Bioengenharia (CGB/IBB), Universidade de Trás-os-Montes e Alto Douro (UTAD), PO Box 1013, 5001-801, Vila Real, Portugal; Departamento de Genética, Facultad de Biología, Universidad Complutense de Madrid (UCM), 28040 Madrid, Spain
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Leiser WL, Rattunde HFW, Weltzien E, Cisse N, Abdou M, Diallo A, Tourè AO, Magalhaes JV, Haussmann BIG. Two in one sweep: aluminum tolerance and grain yield in P-limited soils are associated to the same genomic region in West African sorghum. BMC PLANT BIOLOGY 2014; 14:206. [PMID: 25112843 PMCID: PMC4256928 DOI: 10.1186/s12870-014-0206-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Accepted: 07/22/2014] [Indexed: 05/03/2023]
Abstract
BACKGROUND Sorghum (Sorghum bicolor L. Moench) productivity is severely impeded by low phosphorus (P) and aluminum (Al) toxic soils in sub-Saharan Africa and especially West Africa (WA). Improving productivity of this staple crop under these harsh conditions is crucial to improve food security and farmer's incomes in WA. RESULTS This is the first study to examine the genetics underlying sorghum adaptation to phosphorus limitation in a wide range of WA growing conditions. A set of 187 diverse sorghum genotypes were grown in 29 -P and + P field experiments from 2006-2012 in three WA countries. Sorghum grain yield performance under -P and + P conditions was highly correlated (r = 0.85***). Significant genotype-by-phosphorus interaction was detected but with small magnitude compared to the genotype variance component. We observed high genetic diversity within our panel, with rapid linkage disequilibrium decay, confirming recent sequence based studies in sorghum. Using genome wide association mapping based on 220 934 SNPs we identified one genomic region on chromosome 3 that was highly associated to grain yield production. A major Al-tolerance gene in sorghum, SbMATE, was collocated in this region and SbMATE specific SNPs showed very high associations to grain yield production, especially under -P conditions, explaining up to 16% of the genotypic variance. CONCLUSION The results suggest that SbMATE has a possible pleiotropic role in providing tolerance to two of the most serious abiotic stresses for sorghum in WA, Al toxicity and P deficiency. The identified SNPs can help accelerate breeding for increased sorghum productivity under unfavorable soil conditions and contribute to assuring food security in WA.
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Affiliation(s)
- Willmar L Leiser
- />Institute of Plant Breeding, Seed Science and Population Genetics, University of Hohenheim, Fruwirthstr. 21, 70599 Stuttgart, Germany
- />International Crops Research Institute for the Semi-Arid Tropics, P 320, Bamako, Mali
| | | | - Eva Weltzien
- />International Crops Research Institute for the Semi-Arid Tropics, P 320, Bamako, Mali
| | - Ndiaga Cisse
- />Institut Sénégalais de Recherches Agricoles, BP 3320, Thiès, Senegal
| | - Magagi Abdou
- />Institut National de la Recherche Agronomique, CERRA de Maradi, BP 240, Maradi, Niger
| | | | | | - Jurandir V Magalhaes
- />Embrapa Maize and Sorghum, Rod. MG 424, Km 65, 35701-970 Sete Lagoas, Minas Gerais Brazil
| | - Bettina IG Haussmann
- />Institute of Plant Breeding, Seed Science and Population Genetics, University of Hohenheim, Fruwirthstr. 21, 70599 Stuttgart, Germany
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Guimaraes CT, Simoes CC, Pastina MM, Maron LG, Magalhaes JV, Vasconcellos RCC, Guimaraes LJM, Lana UGP, Tinoco CFS, Noda RW, Jardim-Belicuas SN, Kochian LV, Alves VMC, Parentoni SN. Genetic dissection of Al tolerance QTLs in the maize genome by high density SNP scan. BMC Genomics 2014; 15:153. [PMID: 24564817 PMCID: PMC4007696 DOI: 10.1186/1471-2164-15-153] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Accepted: 01/29/2014] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Aluminum (Al) toxicity is an important limitation to food security in tropical and subtropical regions. High Al saturation on acid soils limits root development, reducing water and nutrient uptake. In addition to naturally occurring acid soils, agricultural practices may decrease soil pH, leading to yield losses due to Al toxicity. Elucidating the genetic and molecular mechanisms underlying maize Al tolerance is expected to accelerate the development of Al-tolerant cultivars. RESULTS Five genomic regions were significantly associated with Al tolerance, using 54,455 SNP markers in a recombinant inbred line population derived from Cateto Al237. Candidate genes co-localized with Al tolerance QTLs were further investigated. Near-isogenic lines (NILs) developed for ZmMATE2 were as Al-sensitive as the recurrent line, indicating that this candidate gene was not responsible for the Al tolerance QTL on chromosome 5, qALT5. However, ZmNrat1, a maize homolog to OsNrat1, which encodes an Al(3+) specific transporter previously implicated in rice Al tolerance, was mapped at ~40 Mbp from qALT5. We demonstrate for the first time that ZmNrat1 is preferentially expressed in maize root tips and is up-regulated by Al, similarly to OsNrat1 in rice, suggesting a role of this gene in maize Al tolerance. The strongest-effect QTL was mapped on chromosome 6 (qALT6), within a 0.5 Mbp region where three copies of the Al tolerance gene, ZmMATE1, were found in tandem configuration. qALT6 was shown to increase Al tolerance in maize; the qALT6-NILs carrying three copies of ZmMATE1 exhibited a two-fold increase in Al tolerance, and higher expression of ZmMATE1 compared to the Al sensitive recurrent parent. Interestingly, a new source of Al tolerance via ZmMATE1 was identified in a Brazilian elite line that showed high expression of ZmMATE1 but carries a single copy of ZmMATE1. CONCLUSIONS High ZmMATE1 expression, controlled either by three copies of the target gene or by an unknown molecular mechanism, is responsible for Al tolerance mediated by qALT6. As Al tolerant alleles at qALT6 are rare in maize, marker-assisted introgression of this QTL is an important strategy to improve maize adaptation to acid soils worldwide.
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Affiliation(s)
- Claudia T Guimaraes
- />Nucleus of Applied Biology, Embrapa Maize and Sorghum, Road MG424, km 65, Sete Lagoas, MG 35701-970 Brazil
| | - Christiano C Simoes
- />Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG Brazil
| | - Maria Marta Pastina
- />Nucleus of Applied Biology, Embrapa Maize and Sorghum, Road MG424, km 65, Sete Lagoas, MG 35701-970 Brazil
| | - Lyza G Maron
- />Department of Plant Breeding and Genetics, Cornell University, Ithaca, NY USA
| | - Jurandir V Magalhaes
- />Nucleus of Applied Biology, Embrapa Maize and Sorghum, Road MG424, km 65, Sete Lagoas, MG 35701-970 Brazil
| | - Renato CC Vasconcellos
- />Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG Brazil
| | - Lauro JM Guimaraes
- />Nucleus of Applied Biology, Embrapa Maize and Sorghum, Road MG424, km 65, Sete Lagoas, MG 35701-970 Brazil
| | - Ubiraci GP Lana
- />Nucleus of Applied Biology, Embrapa Maize and Sorghum, Road MG424, km 65, Sete Lagoas, MG 35701-970 Brazil
| | - Carlos FS Tinoco
- />Departamento de Biologia, Centro Universitário de Sete Lagoas, Sete Lagoas, MG Brazil
| | - Roberto W Noda
- />Nucleus of Applied Biology, Embrapa Maize and Sorghum, Road MG424, km 65, Sete Lagoas, MG 35701-970 Brazil
| | - Silvia N Jardim-Belicuas
- />Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, MG Brazil
| | - Leon V Kochian
- />Robert W. Holley Center for Agriculture and Health, U.S. Department of Agriculture – Agriculture Research Service, Cornell University, Ithaca, NY USA
| | - Vera MC Alves
- />Nucleus of Applied Biology, Embrapa Maize and Sorghum, Road MG424, km 65, Sete Lagoas, MG 35701-970 Brazil
| | - Sidney N Parentoni
- />Nucleus of Applied Biology, Embrapa Maize and Sorghum, Road MG424, km 65, Sete Lagoas, MG 35701-970 Brazil
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Caniato FF, Hamblin MT, Guimaraes CT, Zhang Z, Schaffert RE, Kochian LV, Magalhaes JV. Association mapping provides insights into the origin and the fine structure of the sorghum aluminum tolerance locus, AltSB. PLoS One 2014; 9:e87438. [PMID: 24498106 PMCID: PMC3907521 DOI: 10.1371/journal.pone.0087438] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2013] [Accepted: 12/24/2013] [Indexed: 11/18/2022] Open
Abstract
Root damage caused by aluminum (Al) toxicity is a major cause of grain yield reduction on acid soils, which are prevalent in tropical and subtropical regions of the world where food security is most tenuous. In sorghum, Al tolerance is conferred by SbMATE, an Al-activated root citrate efflux transporter that underlies the major Al tolerance locus, AltSB, on sorghum chromosome 3. We used association mapping to gain insights into the origin and evolution of Al tolerance in sorghum and to detect functional variants amenable to allele mining applications. Linkage disequilibrium across the AltSB locus decreased much faster than in previous reports in sorghum, and reached basal levels at approximately 1000 bp. Accordingly, intra-locus recombination events were found to be extensive. SNPs and indels highly associated with Al tolerance showed a narrow frequency range, between 0.06 and 0.1, suggesting a rather recent origin of Al tolerance mutations within AltSB. A haplotype network analysis suggested a single geographic and racial origin of causative mutations in primordial guinea domesticates in West Africa. Al tolerance assessment in accessions harboring recombinant haplotypes suggests that causative polymorphisms are localized to a ∼6 kb region including intronic polymorphisms and a transposon (MITE) insertion, whose size variation has been shown to be positively correlated with Al tolerance. The SNP with the strongest association signal, located in the second SbMATE intron, recovers 9 of the 14 highly Al tolerant accessions and 80% of all the Al tolerant and intermediately tolerant accessions in the association panel. Our results also demonstrate the pivotal importance of knowledge on the origin and evolution of Al tolerance mutations in molecular breeding applications. Allele mining strategies based on associated loci are expected to lead to the efficient identification, in diverse sorghum germplasm, of Al tolerant accessions able maintain grain yields under Al toxicity.
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Affiliation(s)
| | - Martha T. Hamblin
- Institute for Genomic Diversity, Cornell University, Ithaca, New York, United States of America
| | | | - Zhiwu Zhang
- Institute for Genomic Diversity, Cornell University, Ithaca, New York, United States of America
| | | | - Leon V. Kochian
- Robert W. Holley Center for Agriculture and Health, U.S. Department of Agriculture – Agricultural Research Service, Cornell University, Ithaca, New York, United States of America
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Poschenrieder C, Cabot C, Martos S, Gallego B, Barceló J. Do toxic ions induce hormesis in plants? PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2013; 212:15-25. [PMID: 24094050 DOI: 10.1016/j.plantsci.2013.07.012] [Citation(s) in RCA: 134] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2013] [Revised: 07/14/2013] [Accepted: 07/30/2013] [Indexed: 06/02/2023]
Abstract
The concept of hormesis in plants is critically reviewed, taking growth stimulation by low concentrations of toxic trace elements as a reference. The importance of both non-adaptive and adaptive mechanisms underlying ion-induced hormetic growth responses is highlighted. The activation of defense mechanisms by metal ions and pathogenic elicitors and the cross talk between the signals induced by metal ions and biotic stressors are considered. The production of reactive oxygen species and, consequently, the induction of stress-induced antioxidants, are key mechanisms in metal ion-induced hormesis in plants. It is concluded that in the current scientific literature, hormesis is used as an "umbrella" term that includes a wide range of different mechanisms. It is recommended that the term hormesis be used in plant toxicology as a descriptive term for the stimulated phase in growth response curves that is induced by low concentrations of toxic metal ions without evidence of the underlying mechanisms. If the mechanisms underlying the stimulated growth phase have been identified, specific terms, such as amelioration, defense gene activation, priming or acclimation, should be used.
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Affiliation(s)
- Charlotte Poschenrieder
- Lab. Fisiología Vegetal, Facultad Biociencias, Universidad Autónoma de Barcelona, E-08193 Bellaterra, Spain.
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