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Mashabela MD, Masamba P, Kappo AP. Applications of Metabolomics for the Elucidation of Abiotic Stress Tolerance in Plants: A Special Focus on Osmotic Stress and Heavy Metal Toxicity. PLANTS (BASEL, SWITZERLAND) 2023; 12:269. [PMID: 36678982 PMCID: PMC9860948 DOI: 10.3390/plants12020269] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 01/04/2023] [Accepted: 01/04/2023] [Indexed: 06/17/2023]
Abstract
Plants undergo metabolic perturbations under various abiotic stress conditions; due to their sessile nature, the metabolic network of plants requires continuous reconfigurations in response to environmental stimuli to maintain homeostasis and combat stress. The comprehensive analysis of these metabolic features will thus give an overview of plant metabolic responses and strategies applied to mitigate the deleterious effects of stress conditions at a biochemical level. In recent years, the adoption of metabolomics studies has gained significant attention due to the growing technological advances in analytical biochemistry (plant metabolomics). The complexity of the plant biochemical landscape requires sophisticated, advanced analytical methods. As such, technological advancements in the field of metabolomics have been realized, aided much by the development and refinement of separatory techniques, including liquid and gas chromatography (LC and GC), often hyphenated to state-of-the-art detection instruments such as mass spectrometry (MS) or nuclear resonance magnetic (NMR) spectroscopy. Significant advances and developments in these techniques are briefly highlighted in this review. The enormous progress made thus far also comes with the dawn of the Internet of Things (IoT) and technology housed in machine learning (ML)-based computational tools for data acquisition, mining, and analysis in the 4IR era allowing for broader metabolic coverage and biological interpretation of the cellular status of plants under varying environmental conditions. Thus, scientists can paint a holistic and comprehensive roadmap and predictive models for metabolite-guided crop improvement. The current review outlines the application of metabolomics and related technological advances in elucidating plant responses to abiotic stress, mainly focusing on heavy metal toxicity and subsequent osmotic stress tolerance.
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Affiliation(s)
| | | | - Abidemi Paul Kappo
- Department of Biochemistry, Faculty of Science, University of Johannesburg, Auckland Park Kingsway Campus, P.O. Box 524, Johannesburg 2006, South Africa
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Li Y, Zhang Y, Luo H, Lv D, Yi Z, Duan M, Deng M. WGCNA Analysis Revealed the Hub Genes Related to Soil Cadmium Stress in Maize Kernel ( Zea mays L.). Genes (Basel) 2022; 13:2130. [PMID: 36421805 PMCID: PMC9690088 DOI: 10.3390/genes13112130] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2022] [Revised: 11/07/2022] [Accepted: 11/13/2022] [Indexed: 01/12/2024] Open
Abstract
Soil contamination by heavy metals has become a prevalent topic due to their widespread release from industry, agriculture, and other human activities. Great progress has been made in elucidating the uptake and translocation of cadmium (Cd) accumulation in rice. However, there is still little known about corresponding progress in maize. In the current study, we performed a comparative RNA-Seq-based approach to identify differentially expressed genes (DEGs) of maize immature kernel related to Cd stress. In total, 55, 92, 22, and 542 DEGs responsive to high cadmium concentration soil were identified between XNY22-CHS-8 vs. XNY22-YA-8, XNY22-CHS-24 vs. XNY22-YA-24, XNY27-CHS-8 vs. XNY27-YA-8, and XNY27-CHS-24 vs. XNY27-YA-24, respectively. The weighted gene co-expression network analysis (WGCNA) categorized the 9599 Cd stress-responsive hub genes into 37 different gene network modules. Combining the hub genes and DEGs, we obtained 71 candidate genes. Gene Ontology (GO) enrichment analysis of genes in the greenyellow module in XNY27-YA-24 and connectivity genes of these 71 candidate hub genes showed that the responses to metal ion, inorganic substance, abiotic stimulus, hydrogen peroxide, oxidative stress, stimulus, and other processes were enrichment. Moreover, five candidate genes that were responsive to Cd stress in maize kernel were detected. These results provided the putative key genes and pathways to response to Cd stress in maize kernel, and a useful dataset for unraveling the underlying mechanism of Cd accumulation in maize kernel.
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Affiliation(s)
- Yongjin Li
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Ying Zhang
- College of Agronomy, Northwest A&F University, Xianyang 712100, China
| | - Hongbing Luo
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
- Maize Engineering Technology Research Center of Hunan Province, Changsha 410128, China
| | - Dan Lv
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Zhenxie Yi
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Meijuan Duan
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Min Deng
- College of Agronomy, Hunan Agricultural University, Changsha 410128, China
- Maize Engineering Technology Research Center of Hunan Province, Changsha 410128, China
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Amaral Dos Reis R, Hendrix S, Mourato MP, Louro Martins L, Vangronsveld J, Cuypers A. Efficient regulation of copper homeostasis underlies accession-specific sensitivities to excess copper and cadmium in roots of Arabidopsis thaliana. JOURNAL OF PLANT PHYSIOLOGY 2021; 261:153434. [PMID: 34020275 DOI: 10.1016/j.jplph.2021.153434] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 04/13/2021] [Accepted: 04/26/2021] [Indexed: 06/12/2023]
Abstract
The commonly used Arabidopsis thaliana natural accessions Columbia (Col-0) and Wassilewskija (Ws) are known to differ in their metal sensitivity, with Col-0 being more sensitive to copper (Cu) and cadmium (Cd) than Ws. As both Cu and Cd are known to affect Cu homeostasis, it was investigated whether this process is part of an accession-specific mechanism underlying their difference in metal sensitivity. As roots are the first contact point during metal exposure, responses were compared between roots of both accessions of hydroponically grown plants exposed to excess Cu or Cd for 24 and 72 h. Root Cu levels increased in both accessions under Cu and Cd exposure. However, under Cu exposure, the downregulation of Cu transporter (COPT) genes in combination with a more pronounced upregulation of metallothionein gene MT2b indicated that Ws plants coped better with the elevated Cu concentrations. The Cd-induced disturbance in Cu homeostasis was more efficiently counteracted in roots of Ws plants than in Col-0 plants. This was indicated by a higher upregulation of the SPL7-mediated pathway, crucial in the regulation of the Cu homeostasis response. In conclusion, maintaining the Cu homeostasis response in roots is key to accession-specific differences in Cu and Cd sensitivity.
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Affiliation(s)
- Rafaela Amaral Dos Reis
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Sophie Hendrix
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium; Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Bonn, Germany
| | | | - Luísa Louro Martins
- LEAF, Instituto Superior de Agronomia, Universidade de Lisboa, Lisbon, Portugal
| | - Jaco Vangronsveld
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Ann Cuypers
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium.
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Hendrix S, Iven V, Eekhout T, Huybrechts M, Pecqueur I, Horemans N, Keunen E, De Veylder L, Vangronsveld J, Cuypers A. Suppressor of Gamma Response 1 Modulates the DNA Damage Response and Oxidative Stress Response in Leaves of Cadmium-Exposed Arabidopsis thaliana. FRONTIERS IN PLANT SCIENCE 2020; 11:366. [PMID: 32308663 PMCID: PMC7145961 DOI: 10.3389/fpls.2020.00366] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 03/13/2020] [Indexed: 05/26/2023]
Abstract
Cadmium (Cd) exposure causes an oxidative challenge and inhibits cell cycle progression, ultimately impacting plant growth. Stress-induced effects on the cell cycle are often a consequence of activation of the DNA damage response (DDR). The main aim of this study was to investigate the role of the transcription factor SUPPRESSOR OF GAMMA RESPONSE 1 (SOG1) and three downstream cyclin-dependent kinase inhibitors of the SIAMESE-RELATED (SMR) family in the Cd-induced DDR and oxidative challenge in leaves of Arabidopsis thaliana. Effects of Cd on plant growth, cell cycle regulation and the expression of DDR genes were highly similar between the wildtype and smr4/5/7 mutant. In contrast, sog1-7 mutant leaves displayed a much lower Cd sensitivity within the experimental time-frame and significantly less pronounced upregulations of DDR-related genes, indicating the involvement of SOG1 in the Cd-induced DDR. Cadmium-induced responses related to the oxidative challenge were disturbed in the sog1-7 mutant, as indicated by delayed Cd-induced increases of hydrogen peroxide and glutathione concentrations and lower upregulations of oxidative stress-related genes. In conclusion, our results attribute a novel role to SOG1 in regulating the oxidative stress response and connect oxidative stress to the DDR in Cd-exposed plants.
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Affiliation(s)
- Sophie Hendrix
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Verena Iven
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Thomas Eekhout
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium
- Center for Plant Systems Biology, VIB, Ghent, Belgium
| | - Michiel Huybrechts
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Ingeborg Pecqueur
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Nele Horemans
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
- Biosphere Impact Studies, Belgian Nuclear Research Centre (SCKCEN), Mol, Belgium
| | - Els Keunen
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Lieven De Veylder
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium
- Center for Plant Systems Biology, VIB, Ghent, Belgium
| | - Jaco Vangronsveld
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
| | - Ann Cuypers
- Environmental Biology, Centre for Environmental Sciences, Hasselt University, Diepenbeek, Belgium
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Gu L, Zhao M, Ge M, Zhu S, Cheng B, Li X. Transcriptome analysis reveals comprehensive responses to cadmium stress in maize inoculated with arbuscular mycorrhizal fungi. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 186:109744. [PMID: 31627093 DOI: 10.1016/j.ecoenv.2019.109744] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 09/27/2019] [Accepted: 09/29/2019] [Indexed: 05/12/2023]
Abstract
Biological strategy of utilization of plants-microbe's interactions to remediate cadmium (Cd) contaminated soils is effective and practical. However, limited evidence at transcriptome level is available about how microbes work with host plants to alleviate Cd stress. In the present study, comparative transcriptomic analysis was performed between maize seedlings inoculated with arbuscular mycorrhizal (AM) fungi and non-AM fungi inoculation under distinct concentrations of CdCl2 (0, 25, and 50 mg per kg soil). Significantly higher levels of Cd were found in root tissues of maize colonized by AM fungi, whereas, Cd content was reduced as much as 50% in leaf tissues when compared to non-AM seedlings, indicating that symbiosis between AM fungi and maize seedlings can significantly block translocation of Cd from roots to leaf tissues. Moreover, a total of 5827 differentially expressed genes (DEG) were determined and approximately 68.54% DEGs were downregulated when roots were exposed to high Cd stress. In contrast, 67.16% (595) DEGs were significantly up-regulated when seedlings were colonized by AM fungi under 0 mg CdCl2. Based on hierarchical clustering analysis, global expression profiles were split into eight distinct clusters. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analysis revealed that hundreds of genes functioning in plant hormone signal transduction, mitogen-activated protein kinase (MAPK) signaling pathway and glutathione metabolism were enriched. Furthermore, MapMan pathway analysis indicated a more comprehensive overview response, including hormone metabolism, especially in JA, glutathione metabolism, transcription factors and secondary metabolites, to Cd stress in mycorrhizal maize seedlings. These results provide an overview, at the transcriptome level, of how inoculation of maize seedlings by AM fungi could facilitate the relief of Cd stress.
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Affiliation(s)
- Longjiang Gu
- National Engineering Laboratory of Crop Stress Resistance Breeding, Anhui Agricultural University, Hefei, 230036, China; Anhui Province Key Laboratory of Crop Biology, Anhui Agricultural University, Hefei 230036, China
| | - Manli Zhao
- Schools of Life Sciences, Anhui Agricultural University, Hefei, 230036, China
| | - Min Ge
- Schools of Life Sciences, Anhui Agricultural University, Hefei, 230036, China
| | - Suwen Zhu
- National Engineering Laboratory of Crop Stress Resistance Breeding, Anhui Agricultural University, Hefei, 230036, China; Schools of Life Sciences, Anhui Agricultural University, Hefei, 230036, China
| | - Beijiu Cheng
- National Engineering Laboratory of Crop Stress Resistance Breeding, Anhui Agricultural University, Hefei, 230036, China; Schools of Life Sciences, Anhui Agricultural University, Hefei, 230036, China.
| | - Xiaoyu Li
- National Engineering Laboratory of Crop Stress Resistance Breeding, Anhui Agricultural University, Hefei, 230036, China; Anhui Province Key Laboratory of Crop Biology, Anhui Agricultural University, Hefei 230036, China.
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Lwalaba JLW, Louis LT, Zvobgo G, Fu L, Mwamba TM, Mukobo Mundende RP, Zhang G. Copper alleviates cobalt toxicity in barley by antagonistic interaction of the two metals. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 180:234-241. [PMID: 31096127 DOI: 10.1016/j.ecoenv.2019.04.077] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 04/24/2019] [Accepted: 04/26/2019] [Indexed: 06/09/2023]
Abstract
Cobalt (Co) commonly co-exists with copper (Cu) in natural soils, but the information about their combined effects on plants is poorly available. In this study, we hydroponically investigated the combined effects of Co and Cu on two barley genotypes differing in Co toxicity tolerance to reveal the interaction pattern of these two metals. The results showed that single treatment of Co or Cu at the dose of 100 μM led to a significant decrease of growth and photosynthetic rate, and a significant increase of lipid peroxidation, ROS radicals as well as anti-oxidative enzyme (SOD, CAT and GR) activities and glutathione content, with the extent of effect being less in Yan66 than Ea52. The combined treatment of Co and Cu alleviated the toxicity of both metals in comparison with each metal treatment alone, as reflected by improved growth and photosynthesis, and much slight oxidative stress. The alleviation of metal toxicity upon combined treatment is mainly attributed to a drastic reduction of Co uptake and its translocation from roots to shoots. It may be suggested that interaction of Co and Cu on their uptake and movement in plants is antagonistic.
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Affiliation(s)
- Jonas Lwalaba Wa Lwalaba
- Key Laboratory of Crop Germplasm Resource, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, PR China; Department of Crops Sciences, Faculty of Agronomy, Université de Lubumbashi, PO Box 1825, Lubumbashi, DR, Congo
| | - Laurence Tennyson Louis
- Key Laboratory of Crop Germplasm Resource, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, PR China
| | - Gerald Zvobgo
- Key Laboratory of Crop Germplasm Resource, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, PR China
| | - Liangbo Fu
- Key Laboratory of Crop Germplasm Resource, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, PR China
| | - Theodore Mulembo Mwamba
- Key Laboratory of Crop Germplasm Resource, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, PR China; Department of Crops Sciences, Faculty of Agronomy, Université de Lubumbashi, PO Box 1825, Lubumbashi, DR, Congo
| | | | - Guoping Zhang
- Key Laboratory of Crop Germplasm Resource, Department of Agronomy, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou, 310058, PR China.
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Klimenko O, Pernis M, Danchenko M, Skultéty L, Klubicová K, Shevchenko G. Natural ecotype of Arabidopsis thaliana (L.) Heynh (Chernobyl-07) respond to cadmium stress more intensively than the sensitive ecotypes Oasis and Columbia. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 173:86-95. [PMID: 30769207 DOI: 10.1016/j.ecoenv.2019.02.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 02/01/2019] [Accepted: 02/03/2019] [Indexed: 05/19/2023]
Abstract
Large areas polluted with toxic heavy metals or radionuclides were formed as a side product of rapid industrial development of human society. Plants, due to their sessile nature, should adapt to these challenging genotoxic environmental conditions and develop resistance. Herein, we evaluated the response of three natural ecotypes of Arabidopsis thaliana (L.) Heynh (Oasis, Columbia-0, and Chernobyl-07) to cadmium, using discovery gel-based proteomics. These accessions are differing by level of tolerance to heavy metal probably achieved by various exposure to chronic ionizing radiation. Based on the pairwise comparison (control versus cadmium-treated) we recognized 5.8-13.4% of identified proteins as significantly altered at the presence of cadmium. Although the majority of photosynthesis-related proteins were found to be less abundant in all ecotypes it was noted that in contrast to the sensitive variants (Col and Oas), the tolerant Che accession may activate the mechanism preserving photosynthesis and energy production. Also, proteins modulating energy budget through alternative route and mediating higher resistance to heavy metals were upregulated in this ecotype. Although we suggest that regulation of enzymes acting in peptide and protein synthesis, protection of the plants against various abiotic stresses, or those neutralizing the effects of reactive oxygen species are rather associated with general response to cadmium, they were found to be altered more intensively in the Che accession. Thus, the identified affected proteins may represent good candidate molecules for molecular breeding to improve tolerance of crops to heavy metal stress.
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Affiliation(s)
- Olena Klimenko
- Institute of Plant Genetics and Biotechnology, Plant Science and Biodiversity Center, Slovak Academy of Sciences, Akademická 2, P.O. Box 39A, 950 07 Nitra, Slovakia; Mykola Kholodny Institute of Botany, National Academy of Sciences of Ukraine, Tereshchenkivska 2, 01004 Kyiv, Ukraine
| | - Miroslav Pernis
- Institute of Plant Genetics and Biotechnology, Plant Science and Biodiversity Center, Slovak Academy of Sciences, Akademická 2, P.O. Box 39A, 950 07 Nitra, Slovakia
| | - Maksym Danchenko
- Institute of Virology, Biomedical Research Center, Slovak Academy of Sciences, Dúbravská cesta 9, 845 05 Bratislava, Slovakia
| | - Ludovít Skultéty
- Institute of Virology, Biomedical Research Center, Slovak Academy of Sciences, Dúbravská cesta 9, 845 05 Bratislava, Slovakia; Institute of Microbiology, Czech Academy of Sciences, Videnska 1083, 142 20 Prague, Czech Republic
| | - Katarína Klubicová
- Institute of Plant Genetics and Biotechnology, Plant Science and Biodiversity Center, Slovak Academy of Sciences, Akademická 2, P.O. Box 39A, 950 07 Nitra, Slovakia.
| | - Galina Shevchenko
- Mykola Kholodny Institute of Botany, National Academy of Sciences of Ukraine, Tereshchenkivska 2, 01004 Kyiv, Ukraine
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Carvalho MEA, Piotto FA, Franco MR, Borges KLR, Gaziola SA, Castro PRC, Azevedo RA. Cadmium toxicity degree on tomato development is associated with disbalances in B and Mn status at early stages of plant exposure. ECOTOXICOLOGY (LONDON, ENGLAND) 2018; 27:1293-1302. [PMID: 30259382 DOI: 10.1007/s10646-018-1983-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/03/2018] [Indexed: 06/08/2023]
Abstract
Cadmium (Cd) toxicity is frequently coupled to its accumulation in plants, but not always the highest Cd concentration triggers the worst damages, indicating that additional events influence the magnitude of Cd side-effects. We investigated the early mechanisms behind the differential Cd-induced impacts on plant development of four tomato accessions with contrasting tolerance to Cd toxicity. At organ level, the highest Cd concentration was not associated with the largest biomass losses. In leaves, changes in superoxide dismutase and catalase activities were not related to differences in Cd concentration, which was unable to provoke H2O2 overproduction on the sixth day of plant exposure to this metal. Further investigation in the mineral profile revealed that magnitude of Cd toxicity depends probably on synergic effects from increased B status, in addition to the own Cd accumulation. Furthermore, disbalances in Mn status (i.e., excess in leaves and deficiency in roots) may enhance Cd toxicity degree. According to data, however, the low magnesium (Mg) status can be linked to tomato tolerance against Cd toxicity. In conclusion, the tomato tolerance degree under short-Cd exposure depends on actively, finely regulation of mineral homeostasis that results in different development of plant organs. The better understanding on the mode of action of Cd toxicity in plants can help in the establishment of strategies to mitigate its impacts on crop yield.
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Affiliation(s)
- Marcia Eugenia Amaral Carvalho
- Departamento de Genética, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo (Esalq/USP), Piracicaba, SP, 13418-900, Brazil
| | - Fernando Angelo Piotto
- Departamento de Produção Vegetal, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo (Esalq/ USP), Piracicaba, SP, 13418-900, Brazil
| | - Mônica Regina Franco
- Departamento de Genética, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo (Esalq/USP), Piracicaba, SP, 13418-900, Brazil
| | - Karina Lima Reis Borges
- Departamento de Genética, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo (Esalq/USP), Piracicaba, SP, 13418-900, Brazil
| | - Salete Aparecida Gaziola
- Departamento de Genética, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo (Esalq/USP), Piracicaba, SP, 13418-900, Brazil
| | - Paulo Roberto Camargo Castro
- Departamento de Ciências Biológicas, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo (Esalq/ USP), Piracicaba, SP, 13418-900, Brazil
| | - Ricardo Antunes Azevedo
- Departamento de Genética, Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo (Esalq/USP), Piracicaba, SP, 13418-900, Brazil.
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