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Meena V, Kaur G, Joon R, Shukla V, Choudhary P, Roy JK, Singh B, Pandey AK. Transcriptome and biochemical analysis in hexaploid wheat with contrasting tolerance to iron deficiency pinpoints multi-layered molecular process. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2024; 207:108336. [PMID: 38245990 DOI: 10.1016/j.plaphy.2024.108336] [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: 09/08/2023] [Revised: 12/28/2023] [Accepted: 01/03/2024] [Indexed: 01/23/2024]
Abstract
Iron (Fe) is an essential plant nutrient that is indispensable for many physiological activities. This study is an effort to identify the molecular and biochemical basis of wheat genotypes with contrasting tolerance towards Fe deficiency. Our physiological experiments performed at the early growth stage in cv. Kanchan (KAN) showed Fe deficiency tolerance, whereas cv. PBW343 (PBW) was susceptible. Under Fe deficient condition, KAN showed delayed chlorosis, high SPAD values, and low malondialdehyde content compared to PBW, indicative of Fe deficient condition. Comparative shoot transcriptomics revealed increased expression of photosynthetic pathway genes in PBW, further suggesting its sensitivity to Fe fluctuations. Under Fe deficiency, both the cultivars showed distinct molecular re-arrangements such as high expression of genes involved in Fe uptake (including membrane transporters) and its remobilization. Specifically, in KAN these changes lead to high root phytosiderophores (PS) biosynthesis and its release, resulting in enhanced Fe translocation index. Utilizing the non-transgenic TILLING (Targeting Induced Lesions in Genomes) technology, we identified TaZIFL4.2D as a putative PS efflux transporter. Characterization of the wheat TILLING lines indicated that TaZIFL4.2 functions in PS release and Fe acquisition, thereby imparting tolerance to Fe deficiency. Altogether, this work highlights the mechanistic insight into Fe deficiency tolerance of hexaploid wheat, thus enabling breeders to select suitable genotypes to utilize nutrients for maximum yields.
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Affiliation(s)
- Varsha Meena
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Sector 81, Knowledge City, S.A.S. Nagar, Mohali, 140306, Punjab, India; Regional Centre for Biotechnology, Faridabad 121001, India
| | - Gazaldeep Kaur
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Sector 81, Knowledge City, S.A.S. Nagar, Mohali, 140306, Punjab, India
| | - Riya Joon
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Sector 81, Knowledge City, S.A.S. Nagar, Mohali, 140306, Punjab, India
| | - Vishnu Shukla
- Indian Institute of Science Education and Research, Tirupati, India
| | - Promila Choudhary
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Sector 81, Knowledge City, S.A.S. Nagar, Mohali, 140306, Punjab, India
| | - Joy K Roy
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Sector 81, Knowledge City, S.A.S. Nagar, Mohali, 140306, Punjab, India
| | - Bhupinder Singh
- Nutrio-Physiology and Radiation Biology Laboratory, Division of Environment Science, ICAR-Indian Agriculture Research Institute, New Delhi 110012, India
| | - Ajay K Pandey
- National Agri-Food Biotechnology Institute (Department of Biotechnology), Sector 81, Knowledge City, S.A.S. Nagar, Mohali, 140306, Punjab, India.
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Pestana M, García-Caparrós P, Saavedra T, Gama F, Abadía J, de Varennes A, Correia PJ. Nutritional Performance of Five Citrus Rootstocks under Different Fe Levels. PLANTS (BASEL, SWITZERLAND) 2023; 12:3252. [PMID: 37765416 PMCID: PMC10535202 DOI: 10.3390/plants12183252] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 08/23/2023] [Accepted: 08/24/2023] [Indexed: 09/29/2023]
Abstract
Iron is an essential micronutrient for citrus, playing an important role in photosynthesis and yield. The aim of this paper was to evaluate the tolerance to Fe deficiency of five citrus rootstocks: sour orange (S), Carrizo citrange (C), Citrus macrophylla (M), Troyer citrange (T), and Volkamer lemon (V). Plants were grown for 5 weeks in nutrient solution that contained the following Fe concentrations (in µM): 0, 5, 10, 15, and 20. At the end of the experiment, biomass (dry weight-DW), leaf area, total leaf chlorophyll (CHL), and the activity of root chelate reductase (FCR) were recorded. Additionally, the mineral composition of roots (R) and shoots (S) was evaluated. Principal component analysis was used to study the relationships between all parameters and, subsequently, the relations between rootstocks. In the first component, N-S, P-S, Ca-S, Cu-S, Zn-S, Mn-S, Zn-R, and Mn-R concentrations were related to leaf CHL and FCR. Increases in leaf CHL, Mg-R, and DW (shoots and roots) were inversely related to Cu-R, which was shown in the second component. The values obtained were consistent for V10, C15, and C20, but in contrast for S0 and S5. In conclusion, micronutrient homeostasis in roots and shoots of all rootstocks were affected by Fe stress conditions. The Fe/Cu ratio was significantly related to CHL, which may be used to assist rootstock performance.
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Affiliation(s)
- Maribela Pestana
- MED—Mediterranean Institute for Agriculture, Environment and Development, CHANGE–Global Change and Sustainability Institute, Faculty of Science and Technology, University of Algarve, Campus of Gambelas, Building 8, 8005-139 Faro, Portugal; (T.S.); (P.J.C.)
| | - Pedro García-Caparrós
- Department of Agronomy, Higher Engineering School, University of Almeria, Agrifood Campus of International Excellence CeiA3, Ctra. Sacramentos/n, La Cañada de San Urbano, 04120 Almería, Spain
| | - Teresa Saavedra
- MED—Mediterranean Institute for Agriculture, Environment and Development, CHANGE–Global Change and Sustainability Institute, Faculty of Science and Technology, University of Algarve, Campus of Gambelas, Building 8, 8005-139 Faro, Portugal; (T.S.); (P.J.C.)
| | - Florinda Gama
- MED—Mediterranean Institute for Agriculture, Environment and Development, CHANGE–Global Change and Sustainability Institute, Faculty of Science and Technology, University of Algarve, Campus of Gambelas, Building 8, 8005-139 Faro, Portugal; (T.S.); (P.J.C.)
- GreenCoLab—Associação Oceano Verde, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal
| | - Javier Abadía
- Plant Biology Department, Estación Experimental de Aula Dei, CSIC, Av. Montañana 1005, 50059 Zaragoza, Spain
| | - Amarilis de Varennes
- Instituto Superior de Agronomia, University of Lisbon, Tapada da Ajuda, 1349-017 Lisbon, Portugal
| | - Pedro José Correia
- MED—Mediterranean Institute for Agriculture, Environment and Development, CHANGE–Global Change and Sustainability Institute, Faculty of Science and Technology, University of Algarve, Campus of Gambelas, Building 8, 8005-139 Faro, Portugal; (T.S.); (P.J.C.)
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Saito A, Hoshi K, Wakabayashi Y, Togashi T, Shigematsu T, Katori M, Ohyama T, Higuchi K. Barley Cultivar Sarab 1 Has a Characteristic Region on the Thylakoid Membrane That Protects Photosystem I under Iron-Deficient Conditions. PLANTS (BASEL, SWITZERLAND) 2023; 12:2111. [PMID: 37299090 PMCID: PMC10255597 DOI: 10.3390/plants12112111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/23/2023] [Accepted: 05/24/2023] [Indexed: 06/12/2023]
Abstract
The barley cultivar Sarab 1 (SRB1) can continue photosynthesis despite its low Fe acquisition potential via roots and dramatically reduced amounts of photosystem I (PSI) reaction-center proteins under Fe-deficient conditions. We compared the characteristics of photosynthetic electron transfer (ET), thylakoid ultrastructure, and Fe and protein distribution on thylakoid membranes among barley cultivars. The Fe-deficient SRB1 had a large proportion of functional PSI proteins by avoiding P700 over-reduction. An analysis of the thylakoid ultrastructure clarified that SRB1 had a larger proportion of non-appressed thylakoid membranes than those in another Fe-tolerant cultivar, Ehimehadaka-1 (EHM1). Separating thylakoids by differential centrifugation further revealed that the Fe-deficient SRB1 had increased amounts of low/light-density thylakoids with increased Fe and light-harvesting complex II (LHCII) than did EHM1. LHCII with uncommon localization probably prevents excessive ET from PSII leading to elevated NPQ and lower PSI photodamage in SRB1 than in EHM1, as supported by increased Y(NPQ) and Y(ND) in the Fe-deficient SRB1. Unlike this strategy, EHM1 may preferentially supply Fe cofactors to PSI, thereby exploiting more surplus reaction center proteins than SRB1 under Fe-deficient conditions. In summary, SRB1 and EHM1 support PSI through different mechanisms during Fe deficiency, suggesting that barley species have multiple strategies for acclimating photosynthetic apparatus to Fe deficiency.
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Affiliation(s)
| | | | | | | | | | | | | | - Kyoko Higuchi
- Laboratory of Biochemistry in Plant Productivity, Department of Agricultural Chemistry, Tokyo University of Agriculture, Setagaya-ku, Tokyo 156-8502, Japan; (A.S.); (T.O.)
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Fe (III)-Mediated Antioxidant Response of the Acidotolerant Microalga Coccomyxa onubensis. Antioxidants (Basel) 2023; 12:antiox12030610. [PMID: 36978855 PMCID: PMC10045799 DOI: 10.3390/antiox12030610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 02/20/2023] [Accepted: 02/22/2023] [Indexed: 03/05/2023] Open
Abstract
Coccomyxa onubensis (C. onubensis) is an acidotolerant microalga isolated from Tinto River (Huelva), which contains high levels of metal cations in solution, mainly Fe (II) and (III), and Cu (II). Fe is more bioavailable at low pH, mainly because Fe (II) and Fe (III) are far more soluble, especially Fe (III). For this reason, this study aims to evaluate both physiological and biochemical responses of C. onubensis when subjected to Fe (III)-induced stress. Changes in growth, photosynthetic viability and antioxidant responses to the induced oxidative stress were determined. The results obtained suggest that the addition of moderate Fe (III) levels to C. onubensis cultures results in improved growth and photosynthetic viability. Increases in the intracellular levels of the enzyme superoxide dismutase (SOD) and flavonoids, used as antioxidant response biomarkers, a point at Fe (III)-mediated oxidative stress induction. The apparent decrease in the content of other phenolic molecules and polyunsaturated fatty acids might be understood as a sign of antioxidant molecules' involvement in reactive oxygen species (ROS) scavenging. In conclusion, a noticeable antioxidant capacity displayed by C. onubensis allows the use of moderate Fe (III) levels to trigger the accumulation of valuable antioxidant molecules, allowing the production of cell extracts with potential anti-inflammatory activity.
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Higuchi K, Kurita K, Sakai T, Suzui N, Sasaki M, Katori M, Wakabayashi Y, Majima Y, Saito A, Ohyama T, Kawachi N. "Live-Autoradiography" Technique Reveals Genetic Variation in the Rate of Fe Uptake by Barley Cultivars. PLANTS (BASEL, SWITZERLAND) 2022; 11:plants11060817. [PMID: 35336699 PMCID: PMC8956111 DOI: 10.3390/plants11060817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/17/2022] [Accepted: 03/17/2022] [Indexed: 05/17/2023]
Abstract
Iron (Fe) is an essential trace element in plants; however, the available Fe in soil solution does not always satisfy the demand of plants. Genetic diversity in the rate of Fe uptake by plants has not been broadly surveyed among plant species or genotypes, although plants have developed various Fe acquisition mechanisms. The "live-autoradiography" technique with radioactive 59Fe was adopted to directly evaluate the uptake rate of Fe by barley cultivars from a nutrient solution containing a very low concentration of Fe. The uptake rate of Fe measured by live autoradiography was consistent with the accumulation of Fe-containing proteins on the thylakoid membrane. The results revealed that the ability to acquire Fe from the low-Fe solution was not always the sole determinant of tolerance to Fe deficiency among barley genotypes. The live-autoradiography system visualizes the distribution of β-ray-emitting nuclides and has flexibility in the shape of the field of view. This technique will strongly support phenotyping with regard to the long-distance transport of nutrient elements in the plant body.
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Affiliation(s)
- Kyoko Higuchi
- Laboratory of Biochemistry in Plant Productivity, Department of Agricultural Chemistry, Tokyo University of Agriculture, Tokyo 156-8502, Japan; (M.S.); (M.K.); (Y.W.); (Y.M.); (A.S.); (T.O.)
- Correspondence: ; Tel.: +81-354772315
| | - Keisuke Kurita
- Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA), Ibaraki 319-1195, Japan; (K.K.); (T.S.)
| | - Takuro Sakai
- Materials Sciences Research Center, Japan Atomic Energy Agency (JAEA), Ibaraki 319-1195, Japan; (K.K.); (T.S.)
| | - Nobuo Suzui
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum Science and Technology (QST), Takasaki 370-1292, Japan; (N.S.); (N.K.)
| | - Minori Sasaki
- Laboratory of Biochemistry in Plant Productivity, Department of Agricultural Chemistry, Tokyo University of Agriculture, Tokyo 156-8502, Japan; (M.S.); (M.K.); (Y.W.); (Y.M.); (A.S.); (T.O.)
| | - Maya Katori
- Laboratory of Biochemistry in Plant Productivity, Department of Agricultural Chemistry, Tokyo University of Agriculture, Tokyo 156-8502, Japan; (M.S.); (M.K.); (Y.W.); (Y.M.); (A.S.); (T.O.)
| | - Yuna Wakabayashi
- Laboratory of Biochemistry in Plant Productivity, Department of Agricultural Chemistry, Tokyo University of Agriculture, Tokyo 156-8502, Japan; (M.S.); (M.K.); (Y.W.); (Y.M.); (A.S.); (T.O.)
| | - Yuta Majima
- Laboratory of Biochemistry in Plant Productivity, Department of Agricultural Chemistry, Tokyo University of Agriculture, Tokyo 156-8502, Japan; (M.S.); (M.K.); (Y.W.); (Y.M.); (A.S.); (T.O.)
| | - Akihiro Saito
- Laboratory of Biochemistry in Plant Productivity, Department of Agricultural Chemistry, Tokyo University of Agriculture, Tokyo 156-8502, Japan; (M.S.); (M.K.); (Y.W.); (Y.M.); (A.S.); (T.O.)
| | - Takuji Ohyama
- Laboratory of Biochemistry in Plant Productivity, Department of Agricultural Chemistry, Tokyo University of Agriculture, Tokyo 156-8502, Japan; (M.S.); (M.K.); (Y.W.); (Y.M.); (A.S.); (T.O.)
| | - Naoki Kawachi
- Takasaki Advanced Radiation Research Institute, National Institutes for Quantum Science and Technology (QST), Takasaki 370-1292, Japan; (N.S.); (N.K.)
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Sun S, Li J, Song H, Chen D, Tu M, Chen Q, Jiang G, Zhou Z. Comparative transcriptome and physiological analyses reveal key factors in the tolerance of peach rootstocks to iron deficiency chlorosis. 3 Biotech 2022; 12:38. [PMID: 35070628 PMCID: PMC8738836 DOI: 10.1007/s13205-021-03046-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 10/29/2021] [Indexed: 01/03/2023] Open
Abstract
Iron (Fe) deficiency chlorosis (IDC) is a major nutritional disorder in fruit trees grown on calcareous soils. As a peach rootstock, 'GF677' (Prunus dulcis Miller × P. persica (L.) Batsch) has great tolerance to Fe deficiency, but the molecular mechanisms of 'GF677' that support the process of iron deficiency chlorosis tolerance are still unknown. In this study, the key factors for differential iron deficiency chlorosis tolerance in two contrasting rootstocks (IDC-tolerant: 'GF677', IDC-susceptible: 'Maotao' (P. persica)) were investigated. 'GF677' exhibited greater Fe transfer and accumulation capacities when compared with 'Maotao', and the analysis of photosynthetic pigments, related precursors, and antioxidative enzyme activities further demonstrated that 'GF677' was more tolerant to IDC when compared with 'Maotao'. Furthermore, comparative transcriptome analysis revealed differential expression in many genes involved in iron transport and storage, and in photosynthesis recovery. These results suggest that the greater IDC tolerance of 'GF677' can be attributed to the greater expression of key genes related to specific Fe transporters, defense systems, photosynthetic recovery, and/or special proteins. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s13205-021-03046-6.
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Affiliation(s)
- Shuxia Sun
- Horticulture Research Institute of Sichuan Academy of Agricultural Sciences, Chengdu, 610066 Sichuan China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Southwest Region), Ministry of Agriculture, Chengdu, 610066 Sichuan China
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, 400716 China
| | - Jing Li
- Horticulture Research Institute of Sichuan Academy of Agricultural Sciences, Chengdu, 610066 Sichuan China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Southwest Region), Ministry of Agriculture, Chengdu, 610066 Sichuan China
| | - Haiyan Song
- Horticulture Research Institute of Sichuan Academy of Agricultural Sciences, Chengdu, 610066 Sichuan China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Southwest Region), Ministry of Agriculture, Chengdu, 610066 Sichuan China
| | - Dong Chen
- Horticulture Research Institute of Sichuan Academy of Agricultural Sciences, Chengdu, 610066 Sichuan China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Southwest Region), Ministry of Agriculture, Chengdu, 610066 Sichuan China
| | - Meiyan Tu
- Horticulture Research Institute of Sichuan Academy of Agricultural Sciences, Chengdu, 610066 Sichuan China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Southwest Region), Ministry of Agriculture, Chengdu, 610066 Sichuan China
| | - Qiyang Chen
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, 400716 China
| | - Guoliang Jiang
- Horticulture Research Institute of Sichuan Academy of Agricultural Sciences, Chengdu, 610066 Sichuan China
- Key Laboratory of Biology and Genetic Improvement of Horticultural Crops (Southwest Region), Ministry of Agriculture, Chengdu, 610066 Sichuan China
| | - Zhiqin Zhou
- College of Horticulture and Landscape Architecture, Southwest University, Chongqing, 400716 China
- The Southwest Institute of Fruits Nutrition, Banan District, Chongqing, 400054 China
- Key Laboratory of Horticulture Science for Southern Mountainous Regions, Ministry of Education, Chongqing, 400715 China
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Salhi K, Hajlaoui H, Krouma A. Genotypic differences in response of durum wheat ( Triticum durum Desf.) to lime-induced iron chlorosis. PLANT DIRECT 2022; 6:e377. [PMID: 35028496 PMCID: PMC8743360 DOI: 10.1002/pld3.377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2021] [Revised: 12/07/2021] [Accepted: 12/12/2021] [Indexed: 06/14/2023]
Abstract
Wheat, durum wheat, is the first cereal cultivated and consumed in Tunisia. Because the dominance of calcareous soils in its agroecological systems, known by their low availability of iron (Fe) inducing Fe chlorosis and limiting crop production, its yield remains low. Therefore, the search for tolerant genotypes is always current. In this context, the physiological behavior of six Tunisian genotypes of durum wheat (salim, karim, razek, khiar, inrat100, and maali) cultivated on calcareous and fertile soils for 2 months in a pot experiment was investigated. A greenhouse was used to conduct experiments under natural light. Plant growth, SPAD index, Fe nutrition, Fe distribution, and photosynthesis were monitored and used to evaluate and discriminate their respective physiological responses. On calcareous soil, results revealed reduced plant growth, active Fe, SPAD index, and net photosynthesis. Genotypic differences in the response of wheat to calcareous-induced Fe deficiency were observed and allowed to classify the genotypes Salim and Karim as relatively tolerant. These genotypes expressed Fe translocation capacity (FeT) up to 3 times, Fe use efficiency for photosynthesis (FeUEAn) up to 1.6 times, and chlorophyll use efficiency for photosynthesis (ChlUEAn) up to 3.5 times greater than that expressed by the other genotypes, particularly inrat100 and maali. Thus, the relative tolerance of Salim and Karim is the result of the high ability of Fe uptake and translocation to shoots to support chlorophyll biosynthesis, photosynthesis, and plant growth as well as an important Fe and chlorophyll use efficiency.
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Affiliation(s)
- Khaled Salhi
- Research Unit Valorization and Optimization of Resource Exploitation, Faculty of Sciences and Techniques of Sidi BouzidUniversity of KairouanSidi BouzidTunisia
- Faculty of SciencesUniversity of GafsaGafsaTunisia
| | | | - Abdelmajid Krouma
- Research Unit Valorization and Optimization of Resource Exploitation, Faculty of Sciences and Techniques of Sidi BouzidUniversity of KairouanSidi BouzidTunisia
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Hodgens C, Akpa BS, Long TA. Solving the puzzle of Fe homeostasis by integrating molecular, mathematical, and societal models. CURRENT OPINION IN PLANT BIOLOGY 2021; 64:102149. [PMID: 34839201 DOI: 10.1016/j.pbi.2021.102149] [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: 05/31/2021] [Revised: 09/22/2021] [Accepted: 10/27/2021] [Indexed: 06/13/2023]
Abstract
To ensure optimal utilization and bioavailability, iron uptake, transport, subcellular localization, and assimilation are tightly regulated in plants. Herein, we examine recent advances in our understanding of cellular responses to Fe deficiency. We then use intracellular mechanisms of Fe homeostasis to discuss how formalizing cell biology knowledge via a mathematical model can advance discovery even when quantitative data is limited. Using simulation-based inference to identify plausible systems mechanisms that conform to known emergent phenotypes can yield novel, testable hypotheses to guide targeted experiments. However, this approach relies on the accurate encoding of domain-expert knowledge in exploratory mathematical models. We argue that this would be facilitated by fostering more "systems thinking" life scientists and that diversifying your research team may be a practical path to achieve that goal.
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Affiliation(s)
- Charles Hodgens
- Plant & Microbial Biology, North Carolina State University, Raleigh, NC, USA
| | - Belinda S Akpa
- Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN, USA; Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA.
| | - Terri A Long
- Plant & Microbial Biology, North Carolina State University, Raleigh, NC, USA.
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