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Asfaw KG, Liu Q, Xu X, Manz C, Purper S, Eghbalian R, Münch SW, Wehl I, Bräse S, Eiche E, Hause B, Bogeski I, Schepers U, Riemann M, Nick P. A mitochondria-targeted coenzyme Q peptoid induces superoxide dismutase and alleviates salinity stress in plant cells. Sci Rep 2020; 10:11563. [PMID: 32665569 PMCID: PMC7360622 DOI: 10.1038/s41598-020-68491-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2019] [Accepted: 06/10/2020] [Indexed: 11/08/2022] Open
Abstract
Salinity is a serious challenge to global agriculture and threatens human food security. Plant cells can respond to salt stress either by activation of adaptive responses, or by programmed cell death. The mechanisms deciding the respective response are far from understood, but seem to depend on the degree, to which mitochondria can maintain oxidative homeostasis. Using plant PeptoQ, a Trojan Peptoid, as vehicle, it is possible to transport a coenzyme Q10 (CoQ10) derivative into plant mitochondria. We show that salinity stress in tobacco BY-2 cells (Nicotiana tabacum L. cv Bright Yellow-2) can be mitigated by pretreatment with plant PeptoQ with respect to numerous aspects including proliferation, expansion, redox homeostasis, and programmed cell death. We tested the salinity response for transcripts from nine salt-stress related-genes representing different adaptive responses. While most did not show any significant response, the salt response of the transcription factor NtNAC, probably involved in mitochondrial retrograde signaling, was significantly modulated by the plant PeptoQ. Most strikingly, transcripts for the mitochondrial, Mn-dependent Superoxide Dismutase were rapidly and drastically upregulated in presence of the peptoid, and this response was disappearing in presence of salt. The same pattern, albeit at lower amplitude, was seen for the sodium exporter SOS1. The findings are discussed by a model, where plant PeptoQ modulates retrograde signalling to the nucleus leading to a strong expression of mitochondrial SOD, what renders mitochondria more resilient to perturbations of oxidative balance, such that cells escape salt induced cell death and remain viable.
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Affiliation(s)
- Kinfemichael Geressu Asfaw
- Molecular Cell Biology, Botanical Institute, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 4, D-76131, Karlsruhe, Germany.
| | - Qiong Liu
- Molecular Cell Biology, Botanical Institute, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 4, D-76131, Karlsruhe, Germany
| | - Xiaolu Xu
- Molecular Cell Biology, Botanical Institute, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 4, D-76131, Karlsruhe, Germany
| | - Christina Manz
- Molecular Cell Biology, Botanical Institute, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 4, D-76131, Karlsruhe, Germany
| | - Sabine Purper
- Molecular Cell Biology, Botanical Institute, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 4, D-76131, Karlsruhe, Germany
| | - Rose Eghbalian
- Molecular Cell Biology, Botanical Institute, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 4, D-76131, Karlsruhe, Germany
| | - Stephan W Münch
- Institute of Organic Chemistry, Organic Chemistry I, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, D-76131, Karlsruhe, Germany
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany
| | - Ilona Wehl
- Institute of Organic Chemistry, Organic Chemistry I, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, D-76131, Karlsruhe, Germany
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany
| | - Stefan Bräse
- Institute of Organic Chemistry, Organic Chemistry I, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, D-76131, Karlsruhe, Germany
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany
| | - Elisabeth Eiche
- Institute of Applied Geochemistry (AGW), Geochemistry and Economic Geology Group, Karlsruhe Institute of Technology (KIT), Adenauerring 20b, D-76131, Karlsruhe, Germany
| | - Bettina Hause
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Weinberg 3, D-06120, Halle (Saale), Germany
| | - Ivan Bogeski
- Molecular Physiology, Institute of Cardiovascular Physiology, University Medical Center, Georg-August-University, 37073, Göttingen, Germany
| | - Ute Schepers
- Institute of Organic Chemistry, Organic Chemistry I, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 6, D-76131, Karlsruhe, Germany
- Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany
| | - Michael Riemann
- Molecular Cell Biology, Botanical Institute, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 4, D-76131, Karlsruhe, Germany
| | - Peter Nick
- Molecular Cell Biology, Botanical Institute, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 4, D-76131, Karlsruhe, Germany
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Tran HC, Van Aken O. Mitochondrial unfolded protein-related responses across kingdoms: similar problems, different regulators. Mitochondrion 2020; 53:166-177. [PMID: 32502630 DOI: 10.1016/j.mito.2020.05.009] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 05/19/2020] [Accepted: 05/22/2020] [Indexed: 02/06/2023]
Abstract
Mitochondria are key components of eukaryotic cells, so their proper functioning is monitored via different mitochondrial signalling responses. One of these mitochondria-to-nuclear 'retrograde' responses to maintain mitochondrial homeostasis is the mitochondrial unfolded protein response (UPRmt), which can be activated by a variety of defects including blocking mitochondrial translation, respiration, protein import or transmembrane potential. Although UPRmt was first reported in cultured mammalian cells, this signalling pathway has also been extensively studied in the nematode Caenorhabditis elegans. In yeast, there are no published studies focusing on UPRmt in a strict sense, but other unfolded protein responses (UPR) that appear related to UPRmt have been described, such as the UPR activated by protein mistargeting (UPRam) and mitochondrial compromised protein import response (mitoCPR). In plants, very little is known about UPRmt and only recently some of the regulators have been identified. In this paper, we summarise and compare the current knowledge of the UPRmt and related responses across eukaryotic kingdoms: animals, fungi and plants. Our comparison suggests that each kingdom has evolved its own specific set of regulators, however, the functional categories represented among UPRmt-related target genes appear to be largely overlapping. This indicates that the strategies for preserving proper mitochondrial functions are partially conserved, targeting mitochondrial chaperones, proteases, import components, dynamics and stress response, but likely also non-mitochondrial functions including growth regulators/hormone balance and amino acid metabolism. We also identify homologs of known UPRmt regulators and responsive genes across kingdoms, which may be interesting targets for future research.
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53
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Emami H, Kumar A, Kempken F. Transcriptomic analysis of poco1, a mitochondrial pentatricopeptide repeat protein mutant in Arabidopsis thaliana. BMC PLANT BIOLOGY 2020; 20:209. [PMID: 32397956 PMCID: PMC7216612 DOI: 10.1186/s12870-020-02418-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 04/29/2020] [Indexed: 06/11/2023]
Abstract
BACKGROUND Flowering is a crucial stage during plant development. Plants may respond to unfavorable conditions by accelerating reproductive processes like flowering. In a recent study, we showed that PRECOCIOUS1 (POCO1) is a mitochondrial pentatricopeptide repeat (PPR) protein involved in flowering time and abscisic acid (ABA) signaling in Arabidopsis thaliana. Here, we use RNA-seq data to investigate global gene expression alteration in the poco1 mutant. RESULTS RNA-seq analysis was performed during different developmental stages for wild-type and poco1 plants. The most profound differences in gene expression were found when wild-type and poco1 plants of the same developmental stage were compared. Coverage analysis confirmed the T-DNA insertion in POCO1, which was concomitant with truncated transcripts. Many biological processes were found to be enriched. Several flowering-related genes such as FLOWERING LOCUS T (FT), which may be involved in the early-flowering phenotype of poco1, were differentially regulated. Numerous ABA-associated genes, including the core components of ABA signaling such as ABA receptors, protein phosphatases, protein kinases, and ABA-responsive element (ABRE) binding proteins (AREBs)/ABRE-binding factors (ABFs) as well as important genes for stomatal function, were mostly down-regulated in poco1. Drought and oxidative stress-related genes, including ABA-induced stress genes, were differentially regulated. RNA-seq analysis also uncovered differentially regulated genes encoding various classes of transcription factors and genes involved in cellular signaling. Furthermore, the expression of stress-associated nuclear genes encoding mitochondrial proteins (NGEMPs) was found to be altered in poco1. Redox-related genes were affected, suggesting that the redox state in poco1 might be altered. CONCLUSION The identification of various enriched biological processes indicates that complex regulatory mechanisms underlie poco1 development. Differentially regulated genes associated with flowering may contribute to the early-flowering phenotype of poco1. Our data suggest the involvement of POCO1 in the early ABA signaling process. The down-regulation of many ABA-related genes suggests an association of poco1 mutation with the ABA signaling deficiency. This condition further affects the expression of many stress-related, especially drought-associated genes in poco1, consistent with the drought sensitivity of poco1. poco1 mutation also affects the expression of genes associated with the cellular regulation, redox, and mitochondrial perturbation.
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Affiliation(s)
- Hossein Emami
- Department of Botany, Christian-Albrechts-University, Olshausenstr. 40, 24098, Kiel, Germany
| | - Abhishek Kumar
- Present address: Institute of Bioinformatics, International Technology Park, Bangalore, 560066, India
- Present address: Manipal Academy of Higher Education (MAHE), Manipal, Karnataka, 576104, India
| | - Frank Kempken
- Department of Botany, Christian-Albrechts-University, Olshausenstr. 40, 24098, Kiel, Germany.
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Kacprzak SM, Dahlqvist A, Van Aken O. The transcription factor ANAC017 is a key regulator of mitochondrial proteotoxic stress responses in plants. Philos Trans R Soc Lond B Biol Sci 2020; 375:20190411. [PMID: 32362262 DOI: 10.1098/rstb.2019.0411] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Impaired mitochondrial translation or reduced mitochondrial protein import can lead to imbalances in mitochondrial protein composition. Such mitochondrial proteotoxic stresses can trigger a nuclear transcriptional response commonly described as the mitochondrial unfolded protein response (UPRmt). Despite extensive studies of UPRmt pathways in animal and fungal systems, very little is known about how the UPRmt is regulated in plants. Through comparison of Arabidopsis thaliana whole-genome transcriptome data, it was found that most genes induced by mitochondrial ribosome inhibitor doxycycline are also induced by Complex III inhibitor antimycin A. We demonstrate that transcriptional responses to a wide range of mitochondrial proteotoxic stress-triggers are regulated by the transcription factor ANAC017, which was shown to reside in the endoplasmic reticulum (ER). By contrast, no consistent evidence was found for genes that are specifically induced by doxycycline but not antimycin A. Furthermore, ANAC017 gain- and loss-of-function mutants showed marked resistance or susceptibility, respectively, to mitochondrial stress-inducing treatments, demonstrating the physiological importance of ANAC017 during mitochondrial proteotoxic stress. Finally, it was shown that ethylene signalling promotes mitochondria-to-nucleus signalling, most likely independently of ANAC017. Overall, this study shows that in plants, the UPRmt is largely overlapping with, and perhaps identical to, 'classical' mitochondrial retrograde signalling, and is mediated by ER-anchored transcription factor ANAC017. This article is part of the theme issue 'Retrograde signalling from endosymbiotic organelles'.
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Affiliation(s)
- Sylwia M Kacprzak
- Department of Biology, Lund University, Sölvegatan 35, Lund 223 62, Sweden
| | - Anton Dahlqvist
- Department of Biology, Lund University, Sölvegatan 35, Lund 223 62, Sweden
| | - Olivier Van Aken
- Department of Biology, Lund University, Sölvegatan 35, Lund 223 62, Sweden
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55
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Wang Y, Selinski J, Mao C, Zhu Y, Berkowitz O, Whelan J. Linking mitochondrial and chloroplast retrograde signalling in plants. Philos Trans R Soc Lond B Biol Sci 2020; 375:20190410. [PMID: 32362265 PMCID: PMC7209950 DOI: 10.1098/rstb.2019.0410] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Retrograde signalling refers to the regulation of nuclear gene expression in response to functional changes in organelles. In plants, the two energy-converting organelles, mitochondria and chloroplasts, are tightly coordinated to balance their activities. Although our understanding of components involved in retrograde signalling has greatly increased in the last decade, studies on the regulation of the two organelle signalling pathways have been largely independent. Thus, the mechanism of how mitochondrial and chloroplastic retrograde signals are integrated is largely unknown. Here, we summarize recent findings on the function of mitochondrial signalling components and their links to chloroplast retrograde responses. From this, a picture emerges showing that the major regulators are integrators of both organellar retrograde signalling pathways. This article is part of the theme issue 'Retrograde signalling from endosymbiotic organelles'.
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Affiliation(s)
- Yan Wang
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia
| | - Jennifer Selinski
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia
| | - Chunli Mao
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia.,Department of Animal Science and Technology, Grassland Science, China Agricultural University, Beijing 100193, People's Republic of China
| | - Yanqiao Zhu
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia.,Department of Animal Science and Technology, Grassland Science, China Agricultural University, Beijing 100193, People's Republic of China
| | - Oliver Berkowitz
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia
| | - James Whelan
- Department of Animal, Plant and Soil Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, School of Life Sciences, La Trobe University, Bundoora, Victoria, Australia
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Krupinska K, Blanco NE, Oetke S, Zottini M. Genome communication in plants mediated by organelle-n-ucleus-located proteins. Philos Trans R Soc Lond B Biol Sci 2020; 375:20190397. [PMID: 32362260 PMCID: PMC7209962 DOI: 10.1098/rstb.2019.0397] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
An increasing number of eukaryotic proteins have been shown to have a dual localization in the DNA-containing organelles, mitochondria and plastids, and/or the nucleus. Regulation of dual targeting and relocation of proteins from organelles to the nucleus offer the most direct means for communication between organelles as well as organelles and nucleus. Most of the mitochondrial proteins of animals have functions in DNA repair and gene expression by modelling of nucleoid architecture and/or chromatin. In plants, such proteins can affect replication and early development. Most plastid proteins with a confirmed or predicted second location in the nucleus are associated with the prokaryotic core RNA polymerase and are required for chloroplast development and light responses. Few plastid–nucleus-located proteins are involved in pathogen defence and cell cycle control. For three proteins, it has been clearly shown that they are first targeted to the organelle and then relocated to the nucleus, i.e. the nucleoid-associated proteins HEMERA and Whirly1 and the stroma-located defence protein NRIP1. Relocation to the nucleus can be experimentally demonstrated by plastid transformation leading to the synthesis of proteins with a tag that enables their detection in the nucleus or by fusions with fluoroproteins in different experimental set-ups. This article is part of the theme issue ‘Retrograde signalling from endosymbiotic organelles’.
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Affiliation(s)
- Karin Krupinska
- Institute of Botany, Christian-Albrechts-University of Kiel, Olshausenstraße 40, 24098 Kiel, Germany
| | - Nicolás E Blanco
- Centre of Photosynthetic and Biochemical Studies, Faculty of Biochemical Science and Pharmacy, National University of Rosario (CEFOBI/UNR-CONICET), Rosario, Argentina
| | - Svenja Oetke
- Institute of Botany, Christian-Albrechts-University of Kiel, Olshausenstraße 40, 24098 Kiel, Germany
| | - Michela Zottini
- Department of Biology, University of Padova, Via U. Bassi 58B, 35131 Padova, Italy
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Chardon F, Cueff G, Delannoy E, Aubé F, Lornac A, Bedu M, Gilard F, Pateyron S, Rogniaux H, Gargaros A, Mireau H, Rajjou L, Martin-Magniette ML, Budar F. The Consequences of a Disruption in Cyto-Nuclear Coadaptation on the Molecular Response to a Nitrate Starvation in Arabidopsis. PLANTS (BASEL, SWITZERLAND) 2020; 9:E573. [PMID: 32369924 PMCID: PMC7285260 DOI: 10.3390/plants9050573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 04/20/2020] [Accepted: 04/22/2020] [Indexed: 12/04/2022]
Abstract
Mitochondria and chloroplasts are important actors in the plant nutritional efficiency. So, it could be expected that a disruption of the coadaptation between nuclear and organellar genomes impact plant response to nutrient stresses. We addressed this issue using two Arabidopsis accessions, namely Ct1 and Jea, and their reciprocal cytolines possessing the nuclear genome from one parent and the organellar genomes of the other one. We measured gene expression, and quantified proteins and metabolites under N starvation and non-limiting conditions. We observed a typical response to N starvation at the phenotype and molecular levels. The phenotypical response to N starvation was similar in the cytolines compared to the parents. However, we observed an effect of the disruption of genomic coadaptation at the molecular levels, distinct from the previously described responses to organellar stresses. Strikingly, genes differentially expressed in cytolines compared to parents were mainly repressed in the cytolines. These genes encoded more mitochondrial and nuclear proteins than randomly expected, while N starvation responsive ones were enriched in genes for chloroplast and nuclear proteins. In cytolines, the non-coadapted cytonuclear genomic combination tends to modulate the response to N starvation observed in the parental lines on various biological processes.
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Affiliation(s)
- Fabien Chardon
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (G.C.); (F.A.); (A.L.); (M.B.); (H.M.); (L.R.)
| | - Gwendal Cueff
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (G.C.); (F.A.); (A.L.); (M.B.); (H.M.); (L.R.)
| | - Etienne Delannoy
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Univ Evry, 91405 Orsay, France; (E.D.); (F.G.); (S.P.); (M.-L.M.-M.)
- CNRS, INRAE, Institute of Plant Sciences Paris-Saclay (IPS2), Université de Paris, 91405 Orsay, France
| | - Fabien Aubé
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (G.C.); (F.A.); (A.L.); (M.B.); (H.M.); (L.R.)
| | - Aurélia Lornac
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (G.C.); (F.A.); (A.L.); (M.B.); (H.M.); (L.R.)
| | - Magali Bedu
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (G.C.); (F.A.); (A.L.); (M.B.); (H.M.); (L.R.)
| | - Françoise Gilard
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Univ Evry, 91405 Orsay, France; (E.D.); (F.G.); (S.P.); (M.-L.M.-M.)
- CNRS, INRAE, Institute of Plant Sciences Paris-Saclay (IPS2), Université de Paris, 91405 Orsay, France
| | - Stéphanie Pateyron
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Univ Evry, 91405 Orsay, France; (E.D.); (F.G.); (S.P.); (M.-L.M.-M.)
- CNRS, INRAE, Institute of Plant Sciences Paris-Saclay (IPS2), Université de Paris, 91405 Orsay, France
| | - Hélène Rogniaux
- INRAE, UR BIA, F-44316 Nantes, France; (H.R.); (A.G.)
- INRAE, BIBS Facility, F-44316 Nantes, France
| | - Audrey Gargaros
- INRAE, UR BIA, F-44316 Nantes, France; (H.R.); (A.G.)
- INRAE, BIBS Facility, F-44316 Nantes, France
| | - Hakim Mireau
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (G.C.); (F.A.); (A.L.); (M.B.); (H.M.); (L.R.)
| | - Loïc Rajjou
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (G.C.); (F.A.); (A.L.); (M.B.); (H.M.); (L.R.)
| | - Marie-Laure Martin-Magniette
- Institute of Plant Sciences Paris-Saclay (IPS2), Université Paris-Saclay, CNRS, INRAE, Univ Evry, 91405 Orsay, France; (E.D.); (F.G.); (S.P.); (M.-L.M.-M.)
- CNRS, INRAE, Institute of Plant Sciences Paris-Saclay (IPS2), Université de Paris, 91405 Orsay, France
- UMR MIA-Paris, AgroParisTech, INRA, Université Paris-Saclay, 75005 Paris, France
| | - Françoise Budar
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, 78000 Versailles, France; (G.C.); (F.A.); (A.L.); (M.B.); (H.M.); (L.R.)
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Dourmap C, Roque S, Morin A, Caubrière D, Kerdiles M, Béguin K, Perdoux R, Reynoud N, Bourdet L, Audebert PA, Moullec JL, Couée I. Stress signalling dynamics of the mitochondrial electron transport chain and oxidative phosphorylation system in higher plants. ANNALS OF BOTANY 2020; 125:721-736. [PMID: 31711195 PMCID: PMC7182585 DOI: 10.1093/aob/mcz184] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Accepted: 11/07/2019] [Indexed: 05/23/2023]
Abstract
BACKGROUND Mitochondria play a diversity of physiological and metabolic roles under conditions of abiotic or biotic stress. They may be directly subjected to physico-chemical constraints, and they are also involved in integrative responses to environmental stresses through their central position in cell nutrition, respiration, energy balance and biosyntheses. In plant cells, mitochondria present various biochemical peculiarities, such as cyanide-insensitive alternative respiration, and, besides integration with ubiquitous eukaryotic compartments, their functioning must be coupled with plastid functioning. Moreover, given the sessile lifestyle of plants, their relative lack of protective barriers and present threats of climate change, the plant cell is an attractive model to understand the mechanisms of stress/organelle/cell integration in the context of environmental stress responses. SCOPE The involvement of mitochondria in this integration entails a complex network of signalling, which has not been fully elucidated, because of the great diversity of mitochondrial constituents (metabolites, reactive molecular species and structural and regulatory biomolecules) that are linked to stress signalling pathways. The present review analyses the complexity of stress signalling connexions that are related to the mitochondrial electron transport chain and oxidative phosphorylation system, and how they can be involved in stress perception and transduction, signal amplification or cell stress response modulation. CONCLUSIONS Plant mitochondria are endowed with a diversity of multi-directional hubs of stress signalling that lead to regulatory loops and regulatory rheostats, whose functioning can amplify and diversify some signals or, conversely, dampen and reduce other signals. Involvement in a wide range of abiotic and biotic responses also implies that mitochondrial stress signalling could result in synergistic or conflicting outcomes during acclimation to multiple and complex stresses, such as those arising from climate change.
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Affiliation(s)
- Corentin Dourmap
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
| | - Solène Roque
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
| | - Amélie Morin
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
| | - Damien Caubrière
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
| | - Margaux Kerdiles
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
- Université de Rennes 1, CNRS ECOBIO (Ecosystems-Biodiversity-Evolution) – UMR 6553, Rennes, France
| | - Kyllian Béguin
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
- Université de Rennes 1, CNRS ECOBIO (Ecosystems-Biodiversity-Evolution) – UMR 6553, Rennes, France
| | - Romain Perdoux
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
| | - Nicolas Reynoud
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
| | - Lucile Bourdet
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
| | - Pierre-Alexandre Audebert
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
| | - Julien Le Moullec
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
| | - Ivan Couée
- Université de Rennes 1, Department of Life Sciences and Environment, Campus de Beaulieu, Rennes, France
- Université de Rennes 1, CNRS ECOBIO (Ecosystems-Biodiversity-Evolution) – UMR 6553, Rennes, France
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Vanlerberghe GC, Dahal K, Alber NA, Chadee A. Photosynthesis, respiration and growth: A carbon and energy balancing act for alternative oxidase. Mitochondrion 2020; 52:197-211. [PMID: 32278748 DOI: 10.1016/j.mito.2020.04.001] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 02/28/2020] [Accepted: 04/06/2020] [Indexed: 12/26/2022]
Abstract
This review summarizes knowledge of alternative oxidase, a mitochondrial electron transport chain component that lowers the ATP yield of plant respiration. Analysis of mutant and transgenic plants has established that alternative oxidase activity supports leaf photosynthesis. The interaction of alternative oxidase respiration with chloroplast metabolism is important under conditions that challenge energy and/or carbon balance in the photosynthetic cell. Under such conditions, alternative oxidase provides an extra-chloroplastic means to optimize the status of chloroplast energy pools (ATP, NADPH) and to manage cellular carbohydrate pools in response to changing rates of carbon fixation and carbon demand for growth and maintenance. Transcriptional and post-translational mechanisms ensure that alternative oxidase can respond effectively when carbon and energy balance are being challenged. This function appears particularly significant under abiotic stress conditions such as water deficit, high salinity, or temperature extremes. Under such conditions, alternative oxidase respiration positively affects growth and stress tolerance, despite it lowering the energy yield and carbon use efficiency of respiration. In part, this beneficial effect relates to the ability of alternative oxidase respiration to prevent excessive reactive oxygen species generation in both mitochondria and chloroplasts. Recent evidence suggests that alternative oxidase respiration is an interesting target for crop improvement.
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Affiliation(s)
- Greg C Vanlerberghe
- Department of Biological Sciences, and Department of Cell and Systems Biology, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C1A4, Canada.
| | - Keshav Dahal
- Fredericton Research and Development Centre, Agriculture and Agri-Food Canada, 850 Lincoln Road, P.O. Box 20280, Fredericton, New Brunswick E3B4Z7, Canada
| | - Nicole A Alber
- Department of Biological Sciences, and Department of Cell and Systems Biology, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C1A4, Canada
| | - Avesh Chadee
- Department of Biological Sciences, and Department of Cell and Systems Biology, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C1A4, Canada
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60
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Zhou J, Wang Z, Mao Y, Wang L, Xiao T, Hu Y, Zhang Y, Ma Y. Proteogenomic analysis of pitaya reveals cold stress-related molecular signature. PeerJ 2020; 8:e8540. [PMID: 32095361 PMCID: PMC7020823 DOI: 10.7717/peerj.8540] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 01/09/2020] [Indexed: 11/20/2022] Open
Abstract
Pitayas (Hylocereus spp.) is an attractive, highly nutritious and commercially valuable tropical fruit. However, low-temperature damage limits crop production. Genome of pitaya has not been sequenced yet. In this study, we sequenced the transcriptome of pitaya as the reference and further investigated the proteome under low temperature. By RNAseq technique, approximately 25.3 million reads were obtained, and further trimmed and assembled into 81,252 unigene sequences. The unigenes were searched against UniProt, NR and COGs at NCBI, Pfam, InterPro and Kyoto Encyclopedia of Genes and Genomes (KEGG) database, and 57,905 unigenes were retrieved annotations. Among them, 44,337 coding sequences were predicted by Trandecoder (v2.0.1), which served as the reference database for label-free proteomic analysis study of pitaya. Here, we identified 116 Differentially Abundant Proteins (DAPs) associated with the cold stress in pitaya, of which 18 proteins were up-regulated and 98 proteins were down-regulated. KEGG analysis and other results showed that these DAPs mainly related to chloroplasts and mitochondria metabolism. In summary, chloroplasts and mitochondria metabolism-related proteins may play an important role in response to cold stress in pitayas.
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Affiliation(s)
- Junliang Zhou
- Guizhou Institute of Pomological Sciences, Guizhou Academy of Agricultural Sciences, Guiyang, Guizhou, China
| | - Zhuang Wang
- Guizhou Institute of Pomological Sciences, Guizhou Academy of Agricultural Sciences, Guiyang, Guizhou, China
| | - Yongya Mao
- Guizhou Institute of Pomological Sciences, Guizhou Academy of Agricultural Sciences, Guiyang, Guizhou, China
| | - Lijuan Wang
- Guizhou Institute of Pomological Sciences, Guizhou Academy of Agricultural Sciences, Guiyang, Guizhou, China
| | - Tujian Xiao
- Guizhou Institute of Pomological Sciences, Guizhou Academy of Agricultural Sciences, Guiyang, Guizhou, China
| | - Yang Hu
- Zhejiang Academy of Forestry, Hangzhou, Zhejiang, China.,Zhejiang Provincial Key Laboratory of Biological and Chemical Utilization of Forest Resources, Hangzhou, Zhejiang, China
| | - Yang Zhang
- Fudan University, Institutes of Biomedical Sciences, Shanghai, Shanghai, China
| | - Yuhua Ma
- Guizhou Institute of Pomological Sciences, Guizhou Academy of Agricultural Sciences, Guiyang, Guizhou, China
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61
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Zia SF, Berkowitz O, Bedon F, Whelan J, Franks AE, Plummer KM. Direct comparison of Arabidopsis gene expression reveals different responses to melatonin versus auxin. BMC PLANT BIOLOGY 2019; 19:567. [PMID: 31856719 PMCID: PMC6921455 DOI: 10.1186/s12870-019-2158-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 11/25/2019] [Indexed: 05/06/2023]
Abstract
BACKGROUND Melatonin (N-acetyl-5-methoxytryptamine) in plants, regulates shoot and root growth and alleviates environmental stresses. Melatonin and the phyto-hormone auxin are tryptophan-derived compounds. However, it largely remains controversial as to whether melatonin and auxin act through similar or overlapping signalling and regulatory pathways. RESULTS Here, we have used a promoter-activation study to demonstrate that, unlike auxin (1-naphthalene acetic acid, NAA), melatonin neither induces Direct repeat 5 DR5 expression in Arabidopsis thaliana roots under normal growth conditions nor suppresses the induction of Alternative oxidase 1a AOX1a in leaves upon Antimycin A treatment, both of which are the hallmarks of auxin action. Additionally, comparative global transcriptome analysis conducted on Arabidopsis treated with melatonin or NAA revealed differences in the number and types of differentially expressed genes. Auxin (4.5 μM) altered the expression of a diverse and large number of genes whereas melatonin at 5 μM had no significant effect but melatonin at 100 μM had a modest effect on transcriptome compared to solvent-treated control. Interestingly, the prominent category of genes differentially expressed upon exposure to melatonin trended towards biotic stress defence pathways while downregulation of key genes related to photosynthesis was observed. CONCLUSION Together these findings indicate that though they are both indolic compounds, melatonin and auxin act through different pathways to alter gene expression in Arabidopsis thaliana. Furthermore, it appears that effects of melatonin enable Arabidopsis thaliana to prioritize biotic stress defence signalling rather than growth. These findings clear the current confusion in the literature regarding the relationship of melatonin and auxin and also have greater implications of utilizing melatonin for improved plant protection.
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Affiliation(s)
- Sajal F Zia
- Department of Animal, Plant and Soil Sciences, AgriBio, La Trobe University, Bundoora, VIC, 3086, Australia
| | - Oliver Berkowitz
- Department of Animal, Plant and Soil Sciences, AgriBio, La Trobe University, Bundoora, VIC, 3086, Australia
- ARC Centre of Excellence in Plant Energy Biology, La Trobe University, Bundoora, VIC, 3086, Australia
| | - Frank Bedon
- Department of Animal, Plant and Soil Sciences, AgriBio, La Trobe University, Bundoora, VIC, 3086, Australia.
| | - James Whelan
- Department of Animal, Plant and Soil Sciences, AgriBio, La Trobe University, Bundoora, VIC, 3086, Australia
- ARC Centre of Excellence in Plant Energy Biology, La Trobe University, Bundoora, VIC, 3086, Australia
| | - Ashley E Franks
- Department of Physiology, Anatomy and Microbiology, La Trobe University, Bundoora, VIC, 3086, Australia
- Centre for Future Landscapes, La Trobe University, Bundoora, VIC, 3086, Australia
| | - Kim M Plummer
- Department of Animal, Plant and Soil Sciences, AgriBio, La Trobe University, Bundoora, VIC, 3086, Australia.
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The dynamic responses of plant physiology and metabolism during environmental stress progression. Mol Biol Rep 2019; 47:1459-1470. [PMID: 31823123 DOI: 10.1007/s11033-019-05198-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 11/19/2019] [Indexed: 12/20/2022]
Abstract
At adverse environmental conditions, plants produce various kinds of primary and secondary metabolites to protect themselves. Both primary and secondary metabolites play a significant role during the heat, drought, salinity, genotoxic and cold conditions. A multigene response is activated during the progression of these stresses in the plants which stimulate changes in various signaling molecules, amino acids, proteins, primary and secondary metabolites. Plant metabolism is perturbed because of either the inhibition of metabolic enzymes, shortage of substrates, excess demand for specific compounds or a combination of these factors. In this review, we aim to present how plants synthesize different kinds of natural products during the perception of various abiotic stresses. We also discuss how time-scale variable stresses influence secondary metabolite profiles, could be used as a stress marker in plants. This article has the potential to get the attention of researchers working in the area of quantitative trait locus mapping using metabolites as well as metabolomics genome-wide association.
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Wagner S, Steinbeck J, Fuchs P, Lichtenauer S, Elsässer M, Schippers JHM, Nietzel T, Ruberti C, Van Aken O, Meyer AJ, Van Dongen JT, Schmidt RR, Schwarzländer M. Multiparametric real-time sensing of cytosolic physiology links hypoxia responses to mitochondrial electron transport. THE NEW PHYTOLOGIST 2019; 224:1668-1684. [PMID: 31386759 DOI: 10.1111/nph.16093] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 08/01/2019] [Indexed: 05/24/2023]
Abstract
Hypoxia regularly occurs during plant development and can be induced by the environment through, for example, flooding. To understand how plant tissue physiology responds to progressing oxygen restriction, we aimed to monitor subcellular physiology in real time and in vivo. We establish a fluorescent protein sensor-based system for multiparametric monitoring of dynamic changes in subcellular physiology of living Arabidopsis thaliana leaves and exemplify its applicability for hypoxia stress. By monitoring cytosolic dynamics of magnesium adenosine 5'-triphosphate, free calcium ion concentration, pH, NAD redox status, and glutathione redox status in parallel, linked to transcriptional and metabolic responses, we generate an integrated picture of the physiological response to progressing hypoxia. We show that the physiological changes are surprisingly robust, even when plant carbon status is modified, as achieved by sucrose feeding or extended night. Inhibition of the mitochondrial respiratory chain causes dynamics of cytosolic physiology that are remarkably similar to those under oxygen depletion, highlighting mitochondrial electron transport as a key determinant of the cellular consequences of hypoxia beyond the organelle. A broadly applicable system for parallel in vivo sensing of plant stress physiology is established to map out the physiological context under which both mitochondrial retrograde signalling and low oxygen signalling occur, indicating shared upstream stimuli.
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Affiliation(s)
- Stephan Wagner
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossplatz 8, D-48143, Münster, Germany
- Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Friedrich-Ebert-Allee 144, D-53113, Bonn, Germany
- Max-Planck-Institute for Plant Breeding Research, Carl-von-Linné Weg 10, D-50829, Cologne, Germany
| | - Janina Steinbeck
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossplatz 8, D-48143, Münster, Germany
| | - Philippe Fuchs
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossplatz 8, D-48143, Münster, Germany
- Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Friedrich-Ebert-Allee 144, D-53113, Bonn, Germany
| | - Sophie Lichtenauer
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossplatz 8, D-48143, Münster, Germany
| | - Marlene Elsässer
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossplatz 8, D-48143, Münster, Germany
- Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Friedrich-Ebert-Allee 144, D-53113, Bonn, Germany
- Institute for Cellular and Molecular Botany (IZMB), University of Bonn, Kirschallee 1, D-53115, Bonn, Germany
| | - Jos H M Schippers
- Institute of Biology I, RWTH Aachen University, Worringerweg 1, D-52074, Aachen, Germany
- Leibniz-Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK), Gatersleben, Corrensstraße 3, D-06466, Seeland, Germany
| | - Thomas Nietzel
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossplatz 8, D-48143, Münster, Germany
- Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Friedrich-Ebert-Allee 144, D-53113, Bonn, Germany
| | - Cristina Ruberti
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossplatz 8, D-48143, Münster, Germany
| | - Olivier Van Aken
- Department of Biology, Lund University, Sölvegatan 35, Lund, 223 62, Sweden
| | - Andreas J Meyer
- Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Friedrich-Ebert-Allee 144, D-53113, Bonn, Germany
| | - Joost T Van Dongen
- Institute of Biology I, RWTH Aachen University, Worringerweg 1, D-52074, Aachen, Germany
| | - Romy R Schmidt
- Institute of Biology I, RWTH Aachen University, Worringerweg 1, D-52074, Aachen, Germany
| | - Markus Schwarzländer
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossplatz 8, D-48143, Münster, Germany
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Mansilla N, Welchen E, Gonzalez DH. Arabidopsis SCO Proteins Oppositely Influence Cytochrome c Oxidase Levels and Gene Expression during Salinity Stress. PLANT & CELL PHYSIOLOGY 2019; 60:2769-2784. [PMID: 31418792 DOI: 10.1093/pcp/pcz166] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 08/12/2019] [Indexed: 06/10/2023]
Abstract
SCO (synthesis of cytochrome c oxidase) proteins are involved in the insertion of copper during the assembly of cytochrome c oxidase (COX), the final enzyme of the mitochondrial respiratory chain. Two SCO proteins, namely, homolog of copper chaperone 1 and 2 (HCC1 and HCC2) are present in seed plants, but HCC2 lacks the residues involved in copper binding, leading to uncertainties about its function. In this study, we performed a transcriptomic and phenotypic analysis of Arabidopsis thaliana plants with reduced expression of HCC1 or HCC2. We observed that a deficiency in HCC1 causes a decrease in the expression of several stress-responsive genes, both under basal growth conditions and after applying a short-term high salinity treatment. In addition, HCC1 deficient plants show a faster decrease in chlorophyll content, photosystem II quantum efficiency and COX levels after salinity stress, as well as a faster increase in alternative oxidase capacity. Notably, HCC2 deficiency causes opposite changes in most of these parameters. Bimolecular fluorescence complementation analysis indicated that both proteins are able to interact. We postulate that HCC1 is a limiting factor for COX assembly during high salinity conditions and that HCC2 probably acts as a negative modulator of HCC1 activity through protein-protein interactions. In addition, a direct or indirect role of HCC1 and HCC2 in the gene expression response to stress is proposed.
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Affiliation(s)
- Natanael Mansilla
- Instituto de Agrobiotecnolog�a del Litoral (CONICET-UNL), C�tedra de Biolog�a Celular y Molecular, Facultad de Bioqu�mica y Ciencias Biol�gicas, Universidad Nacional del Litoral, Santa Fe 3000, Argentina
| | - Elina Welchen
- Instituto de Agrobiotecnolog�a del Litoral (CONICET-UNL), C�tedra de Biolog�a Celular y Molecular, Facultad de Bioqu�mica y Ciencias Biol�gicas, Universidad Nacional del Litoral, Santa Fe 3000, Argentina
| | - Daniel H Gonzalez
- Instituto de Agrobiotecnolog�a del Litoral (CONICET-UNL), C�tedra de Biolog�a Celular y Molecular, Facultad de Bioqu�mica y Ciencias Biol�gicas, Universidad Nacional del Litoral, Santa Fe 3000, Argentina
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65
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Lee K, Park SJ, Park YI, Kang H. CFM9, a Mitochondrial CRM Protein, Is Crucial for Mitochondrial Intron Splicing, Mitochondria Function and Arabidopsis Growth and Stress Responses. PLANT & CELL PHYSIOLOGY 2019; 60:2538-2548. [PMID: 31359042 DOI: 10.1093/pcp/pcz147] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 07/18/2019] [Indexed: 05/24/2023]
Abstract
Although the importance of chloroplast RNA splicing and ribosome maturation (CRM) domain-containing proteins has been established for chloroplast RNA metabolism and plant development, the functional role of CRM proteins in mitochondria remains largely unknown. Here, we investigated the role of a mitochondria-targeted CRM protein (At3g27550), named CFM9, in Arabidopsis thaliana. Confocal analysis revealed that CFM9 is localized in mitochondria. The cfm9 mutant exhibited delayed seed germination, retarded growth and shorter height compared with the wild type under normal conditions. The growth-defect phenotypes were more manifested upon high salinity, dehydration or ABA application. Complementation lines expressing CFM9 in the mutant background fully recovered the wild-type phenotypes. Notably, the mutant had abnormal mitochondria, increased hydrogen peroxide and reduced respiration activity, implying that CFM9 is indispensable for normal mitochondrial function. More important, the splicing of many intron-containing genes in mitochondria was defective in the mutant, suggesting that CFM9 plays a crucial role in the splicing of mitochondrial introns. Collectively, our results provide clear evidence emphasizing that CFM9 is an essential factor in the splicing of mitochondrial introns, which is crucial for mitochondrial biogenesis and function and the growth and development of Arabidopsis.
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Affiliation(s)
- Kwanuk Lee
- Department of Applied Biology, College of Agriculture and Life Sciences, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, Korea
| | - Su Jung Park
- Department of Applied Biology, College of Agriculture and Life Sciences, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, Korea
| | - Youn-Il Park
- Department of Biological Sciences, Chungnam National University, Daejeon, Korea
| | - Hunseung Kang
- Department of Applied Biology, College of Agriculture and Life Sciences, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, Korea
- AgriBio Institute of Climate Change Management, Chonnam National University, Gwangju, Korea
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66
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Jo YD, Lee HY, Ro NY, Kim SH, Kim JB, Kang BC, Kang SY. Mitotypes Based on Structural Variation of Mitochondrial Genomes Imply Relationships With Morphological Phenotypes and Cytoplasmic Male Sterility in Peppers. FRONTIERS IN PLANT SCIENCE 2019; 10:1343. [PMID: 31708952 PMCID: PMC6822277 DOI: 10.3389/fpls.2019.01343] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Accepted: 09/27/2019] [Indexed: 06/10/2023]
Abstract
Plant mitochondrial genomes characteristically contain extensive structural variation that can be used to define and classify cytoplasm types. We developed markers based on structural variation in the mitochondrial genomes of fertile and cytoplasmic male sterility (CMS) pepper lines and applied them to a panel of Capsicum accessions. We designed a total of 20 sequence characterized amplified region (SCAR) markers based on DNA rearrangement junctions or cytoplasm-specific segments that did not show high similarity to any nuclear mitochondrial DNA segments. We used those markers to classify the mitotypes of 96 C. annuum accessions into 15 groups. Precise genotyping of other Capsicum species (C. frutescens, C. chinense, and C. baccatum) was hampered because of various stoichiometric levels of marker amplicons. We developed a multiplex PCR system based on four of the markers that efficiently classified the C. annuum accessions into five mitotype groups. Close relationships between specific mitotypes and morphological phenotypes implied that diversification or domestication of C. annuum germplasm might have been accompanied by structural rearrangements of mitochondrial DNA or the selection of germplasms with specific mitotypes. Meanwhile, CMS lines shared the same amplification profile of markers with another mitotype. Further analysis using mitochondrial DNA (mtDNA) markers based on single-nucleotide polymorphisms (SNPs) or insertions and deletions (InDels) and CMS-specific open reading frames (orfs) provided new information about the origin of the CMS-specific mitotype and evaluation of candidates for CMS-associated genes, respectively.
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Affiliation(s)
- Yeong Deuk Jo
- Radiation Breeding Team, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, South Korea
| | - Hea-Young Lee
- Department of Plant Science and Vegetable Breeding Research Center, Seoul National University, Seoul, South Korea
| | - Na-Young Ro
- National Agrobiodiversity Center, National Academy of Agricultural Science, Rural Development Administration, Jeonju, South Korea
| | - Sang Hoon Kim
- Radiation Breeding Team, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, South Korea
| | - Jin-Baek Kim
- Radiation Breeding Team, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, South Korea
| | - Byoung-Cheorl Kang
- Department of Plant Science and Vegetable Breeding Research Center, Seoul National University, Seoul, South Korea
| | - Si-Yong Kang
- Radiation Breeding Team, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeongeup, South Korea
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67
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Alber NA, Vanlerberghe GC. Signaling interactions between mitochondria and chloroplasts in Nicotiana tabacum leaf. PHYSIOLOGIA PLANTARUM 2019; 167:188-204. [PMID: 30467859 DOI: 10.1111/ppl.12879] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2018] [Accepted: 11/15/2018] [Indexed: 06/09/2023]
Abstract
Research has begun to elucidate the signal transduction pathway(s) that control cellular responses to changes in mitochondrial status. Important tools in such studies are chemical inhibitors used to initiate mitochondrial dysfunction. This study compares the effect of different inhibitors and treatment conditions on the transcript amount of nuclear genes specifically responsive to mitochondrial dysfunction in leaf of Nicotiana tabacum L. cv. Petit Havana. The Complex III inhibitors antimycin A (AA) and myxothiazol (MYXO), and the Complex V inhibitor oligomycin (OLIGO), each increased the transcript amount of the mitochondrial dysfunction genes. Transcript responses to OLIGO were greater during treatment in the dark than in the light, and the dark treatment resulted in cell death. In the dark, transcript responses to AA and MYXO were similar to one another, despite MYXO leading to cell death. In the light, transcript responses to AA and MYXO diverged, despite cell viability remaining high with either inhibitor. This divergent response may be due to differential signaling from the chloroplast because only AA also inhibited cyclic electron transport, resulting in a strong acceptor-side limitation in photosystem I. In the light, chemical inhibition of chloroplast electron transport reduced transcript responses to AA, while having no effect on the response to MYXO, and increasing the response to OLIGO. Hence, when studying mitochondrial dysfunction signaling, different inhibitor and treatment combinations differentially affect linked processes (e.g. chloroplast function and cell fate) that then contribute to measured responses. Therefore, inhibitor and treatment conditions should be chosen to align with specific study goals.
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Affiliation(s)
- Nicole A Alber
- Department of Biological Sciences, Department of Cell and Systems Biology, University of Toronto Scarborough, Toronto, Ontario, M1C 1A4, Canada
| | - Greg C Vanlerberghe
- Department of Biological Sciences, Department of Cell and Systems Biology, University of Toronto Scarborough, Toronto, Ontario, M1C 1A4, Canada
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68
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Li L, Lavell A, Meng X, Berkowitz O, Selinski J, van de Meene A, Carrie C, Benning C, Whelan J, De Clercq I, Wang Y. Arabidopsis DGD1 SUPPRESSOR1 Is a Subunit of the Mitochondrial Contact Site and Cristae Organizing System and Affects Mitochondrial Biogenesis. THE PLANT CELL 2019; 31:1856-1878. [PMID: 31118221 PMCID: PMC6713299 DOI: 10.1105/tpc.18.00885] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 04/15/2019] [Accepted: 05/09/2019] [Indexed: 05/04/2023]
Abstract
Mitochondrial and plastid biogenesis requires the biosynthesis and assembly of proteins, nucleic acids, and lipids. In Arabidopsis (Arabidopsis thaliana), the mitochondrial outer membrane protein DGD1 SUPPRESSOR1 (DGS1) is part of a large multi-subunit protein complex that contains the mitochondrial contact site and cristae organizing system 60-kD subunit, the translocase of outer mitochondrial membrane 40-kD subunit (TOM40), the TOM20s, and the Rieske FeS protein. A point mutation in DGS1, dgs1-1, altered the stability and protease accessibility of this complex. This altered mitochondrial biogenesis, mitochondrial size, lipid content and composition, protein import, and respiratory capacity. Whole plant physiology was affected in the dgs1-1 mutant as evidenced by tolerance to imposed drought stress and altered transcriptional responses of markers of mitochondrial retrograde signaling. Putative orthologs of Arabidopsis DGS1 are conserved in eukaryotes, including the Nuclear Control of ATP Synthase2 (NCA2) protein in yeast (Saccharomyces cerevisiae), but lost in Metazoa. The genes encoding DGS1 and NCA2 are part of a similar coexpression network including genes encoding proteins involved in mitochondrial fission, morphology, and lipid homeostasis. Thus, DGS1 links mitochondrial protein and lipid import with cellular lipid homeostasis and whole plant stress responses.
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Affiliation(s)
- Lu Li
- Department of Animal, Plant and Soil Science, School of Life Science, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
| | - Anastasiya Lavell
- MSU-DOE Plant Research Laboratory and Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824
| | - Xiangxiang Meng
- Department of Animal, Plant and Soil Science, School of Life Science, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
| | - Oliver Berkowitz
- Department of Animal, Plant and Soil Science, School of Life Science, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
| | - Jennifer Selinski
- Department of Animal, Plant and Soil Science, School of Life Science, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
| | | | - Chris Carrie
- Department Biologie I - Botanik, Ludwig-Maximilians-Universität München, Großhadernerstrasse 2-4, Planegg-Martinsried, 82152, Germany
| | - Christoph Benning
- MSU-DOE Plant Research Laboratory and Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824
| | - James Whelan
- Department of Animal, Plant and Soil Science, School of Life Science, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
| | - Inge De Clercq
- Department of Animal, Plant and Soil Science, School of Life Science, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
| | - Yan Wang
- Department of Animal, Plant and Soil Science, School of Life Science, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
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Farooq MA, Niazi AK, Akhtar J, Farooq M, Souri Z, Karimi N, Rengel Z. Acquiring control: The evolution of ROS-Induced oxidative stress and redox signaling pathways in plant stress responses. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2019; 141:353-369. [PMID: 31207496 DOI: 10.1016/j.plaphy.2019.04.039] [Citation(s) in RCA: 157] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2019] [Revised: 04/23/2019] [Accepted: 04/30/2019] [Indexed: 05/18/2023]
Abstract
Reactive oxygen species (ROS) - the byproducts of aerobic metabolism - influence numerous aspects of the plant life cycle and environmental response mechanisms. In plants, ROS act like a double-edged sword; they play multiple beneficial roles at low concentrations, whereas at high concentrations ROS and related redox-active compounds cause cellular damage through oxidative stress. To examine the dual role of ROS as harmful oxidants and/or crucial cellular signals, this review elaborates that (i) how plants sense and respond to ROS in various subcellular organelles and (ii) the dynamics of subsequent ROS-induced signaling processes. The recent understanding of crosstalk between various cellular compartments in mediating their redox state spatially and temporally is discussed. Emphasis on the beneficial effects of ROS in maintaining cellular energy homeostasis, regulating diverse cellular functions, and activating acclimation responses in plants exposed to abiotic and biotic stresses are described. The comprehensive view of cellular ROS dynamics covering the breadth and versatility of ROS will contribute to understanding the complexity of apparently contradictory ROS roles in plant physiological responses in less than optimum environments.
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Affiliation(s)
- Muhammad Ansar Farooq
- Institute of Soil & Environmental Sciences, University of Agriculture, Faisalabad, Pakistan.
| | - Adnan Khan Niazi
- Center of Agricultural Biochemistry and Biotechnology, University of Agriculture, Faisalabad, Pakistan
| | - Javaid Akhtar
- Institute of Soil & Environmental Sciences, University of Agriculture, Faisalabad, Pakistan
| | - Muhammad Farooq
- Department of Crop Sciences, College of Agricultural and Marine Sciences, Sultan Qaboos University, Oman
| | - Zahra Souri
- Laboratory of Plant Physiology, Department of Biology, Faculty of Science, Razi University, Kermanshah, Iran
| | - Naser Karimi
- Laboratory of Plant Physiology, Department of Biology, Faculty of Science, Razi University, Kermanshah, Iran
| | - Zed Rengel
- School of Agriculture and Environment, University of Western Australia, 35 Stirling Highway, Perth, WA, 6009, Australia
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70
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Upadhyay S, Srivastava Y. Retrograde response by reactive oxygen/nitrogen species in plants involving different cellular organelles. Biol Chem 2019; 400:979-989. [PMID: 31004559 DOI: 10.1515/hsz-2018-0463] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 04/07/2019] [Indexed: 01/17/2023]
Abstract
During oxidative and nitrosative stress conditions cellular organelles convey information to the nucleus to express specific sets of genes to withstand the stress condition and to reorganize their growth and developmental pattern. This organelle to nucleus communication is termed retrograde signaling. In the plant system chloroplast and peroxisomes are mainly involved with little involvement of mitochondria and other organelles in oxidative stress-mediated retrograde signaling. In this review, we will discuss retrograde signaling in plant systems with factors that regulate this signaling cascade.
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Affiliation(s)
- Swati Upadhyay
- Biotechnology Division (CSIR-CIMAP), Central Institute of Medicinal and Aromatic Plants (CSIR-CIMAP), P.O. CIMAP, Near Kukrail Picnic Spot, Lucknow 226015, India
| | - Yashdeep Srivastava
- Department of Metabolic and Structural Biology, Central Institute of Medicinal and Aromatic Plants (CSIR-CIMAP), Lucknow 226015, India
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71
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Mao Y, Chen C. The Hap Complex in Yeasts: Structure, Assembly Mode, and Gene Regulation. Front Microbiol 2019; 10:1645. [PMID: 31379791 PMCID: PMC6652802 DOI: 10.3389/fmicb.2019.01645] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Accepted: 07/03/2019] [Indexed: 01/19/2023] Open
Abstract
The CCAAT box-harboring proteins represent a family of heterotrimeric transcription factors which is highly conserved in eukaryotes. In fungi, one of the particularly important homologs of this family is the Hap complex that separates the DNA-binding domain from the activation domain and imposes essential impacts on regulation of a wide range of cellular functions. So far, a comprehensive summary of this complex has been described in filamentous fungi but not in the yeast. In this review, we summarize a number of studies related to the structure and assembly mode of the Hap complex in a list of representative yeasts. Furthermore, we emphasize recent advances in understanding the regulatory functions of this complex, with a special focus on its role in regulating respiration, production of reactive oxygen species (ROS) and iron homeostasis.
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Affiliation(s)
- Yinhe Mao
- Key Laboratory of Molecular Virology and Immunology, Unit of Pathogenic Fungal Infection and Host Immunity, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China.,University of Chinese Academy of Sciences, Beijing, China
| | - Changbin Chen
- Key Laboratory of Molecular Virology and Immunology, Unit of Pathogenic Fungal Infection and Host Immunity, Institut Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, China
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72
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Elkonin LA, Kozhemyakin VV, Tsvetova MI. The sporophytic type of fertility restoration in the A3 CMS-inducing cytoplasm of sorghum and its modification by plant water availability conditions. Vavilovskii Zhurnal Genet Selektsii 2019. [DOI: 10.18699/vj19.510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The A3 type of CMS in sorghum is one of the most difficult to restore fertility because of the low frequency of fertilityrestoring genes among sorghum accessions, the complex mechanism of fertility restoration that occurs with the complementary interaction of two gametophytic genes Rf3 and Rf4, and the sensitivity of their expression to air and soil drought. In order to test the hypothesis of the sporophytic type of fertility restoration in CMS lines with A3 type cytoplasm developed in our laboratory, we analyzed segregation in the self-pollinated progeny of fertile F1hybrids grown under different water availability conditions (in a dryland plot, in plots with additional irrigation, in a growth chamber, and in an experimental field with a natural precipitation regime) and in their backcrosses to the maternal CMS-line. The presence of sterile plants in the F2 and BC1 families with the maternal CMS line grown in all tested water availability conditions argues for the sporophytic mechanism of fertility restoration. Cytological analysis of fertile F1 hybrids revealed a significant amount of degenerating pollen grains (PGs) with impaired starch accumulation and detachment of the PG contents from the cell wall. It is assumed that the expression of the fertility-restoring genes Rf3 and Rf4 in the hybrids with studied CMS lines starts already in the sporophyte tissues, normalizing the development of a certain part of the PGs carrying the recessive alleles of these genes (rf3 and rf4), which are involved in fertilization and give rise to sterile genotypes found in F2 and BC1 families. For the first time, the transgenerational effect of water availability conditions of growing a fertility-restoring line on male fertility of the F2 generation was detected: a pollinator grown in a plot with additional irrigation produced more fertile and less sterile individuals compared to the same pollinator grown under a rainfall shelter (p < 0.01), and the segregation pattern changed from digenic to monogenic, indicating heritable inhibition of the expression of one of the fertility-restoring genes (kind of “grandfather effect”). The possibility of selection for the stability of the fertility restoration system of the A3 cytoplasm to functioning under conditions of high vapor pressure deficit during the flowering period was shown. These data may contribute to the creation of effective fertility restoring lines for this type of CMS in sorghum.
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Affiliation(s)
- L. A. Elkonin
- Agricultural Research Institute for South-East Region
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73
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Lama S, Broda M, Abbas Z, Vaneechoutte D, Belt K, Säll T, Vandepoele K, Van Aken O. Neofunctionalization of Mitochondrial Proteins and Incorporation into Signaling Networks in Plants. Mol Biol Evol 2019; 36:974-989. [PMID: 30938771 PMCID: PMC6501883 DOI: 10.1093/molbev/msz031] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Because of their symbiotic origin, many mitochondrial proteins are well conserved across eukaryotic kingdoms. It is however less obvious how specific lineages have obtained novel nuclear-encoded mitochondrial proteins. Here, we report a case of mitochondrial neofunctionalization in plants. Phylogenetic analysis of genes containing the Domain of Unknown Function 295 (DUF295) revealed that the domain likely originated in Angiosperms. The C-terminal DUF295 domain is usually accompanied by an N-terminal F-box domain, involved in ubiquitin ligation via binding with ASK1/SKP1-type proteins. Due to gene duplication, the gene family has expanded rapidly, with 94 DUF295-related genes in Arabidopsis thaliana alone. Two DUF295 family subgroups have uniquely evolved and quickly expanded within Brassicaceae. One of these subgroups has completely lost the F-box, but instead obtained strongly predicted mitochondrial targeting peptides. We show that several representatives of this DUF295 Organellar group are effectively targeted to plant mitochondria and chloroplasts. Furthermore, many DUF295 Organellar genes are induced by mitochondrial dysfunction, whereas F-Box DUF295 genes are not. In agreement, several Brassicaceae-specific DUF295 Organellar genes were incorporated in the evolutionary much older ANAC017-dependent mitochondrial retrograde signaling pathway. Finally, a representative set of DUF295 T-DNA insertion mutants was created. No obvious aberrant phenotypes during normal growth and mitochondrial dysfunction were observed, most likely due to the large extent of gene duplication and redundancy. Overall, this study provides insight into how novel mitochondrial proteins can be created via “intercompartmental” gene duplication events. Moreover, our analysis shows that these newly evolved genes can then be specifically integrated into relevant, pre-existing coexpression networks.
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Affiliation(s)
- Sbatie Lama
- Department of Biology, Lund University, Lund, Sweden
| | - Martyna Broda
- ARC Centre of Excellence in Plant Energy Biology, University of Western Australia, Crawley, Australia
| | - Zahra Abbas
- ARC Centre of Excellence in Plant Energy Biology, University of Western Australia, Crawley, Australia
| | - Dries Vaneechoutte
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium.,VIB Center for Plant Systems Biology, Ghent, Belgium
| | - Katharina Belt
- ARC Centre of Excellence in Plant Energy Biology, University of Western Australia, Crawley, Australia.,CSIRO, Floreat, WA, Australia
| | - Torbjörn Säll
- Department of Biology, Lund University, Lund, Sweden
| | - Klaas Vandepoele
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium.,VIB Center for Plant Systems Biology, Ghent, Belgium
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74
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Niazi AK, Delannoy E, Iqbal RK, Mileshina D, Val R, Gabryelska M, Wyszko E, Soubigou-Taconnat L, Szymanski M, Barciszewski J, Weber-Lotfi F, Gualberto JM, Dietrich A. Mitochondrial Transcriptome Control and Intercompartment Cross-Talk During Plant Development. Cells 2019; 8:E583. [PMID: 31200566 PMCID: PMC6627697 DOI: 10.3390/cells8060583] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 06/03/2019] [Accepted: 06/11/2019] [Indexed: 01/17/2023] Open
Abstract
We address here organellar genetic regulation and intercompartment genome coordination. We developed earlier a strategy relying on a tRNA-like shuttle to mediate import of nuclear transgene-encoded custom RNAs into mitochondria in plants. In the present work, we used this strategy to drive trans-cleaving hammerhead ribozymes into the organelles, to knock down specific mitochondrial RNAs and analyze the regulatory impact. In a similar approach, the tRNA mimic was used to import into mitochondria in Arabidopsis thaliana the orf77, an RNA associated with cytoplasmic male sterility in maize and possessing sequence identities with the atp9 mitochondrial RNA. In both cases, inducible expression of the transgenes allowed to characterise early regulation and signaling responses triggered by these respective manipulations of the organellar transcriptome. The results imply that the mitochondrial transcriptome is tightly controlled by a "buffering" mechanism at the early and intermediate stages of plant development, a control that is released at later stages. On the other hand, high throughput analyses showed that knocking down a specific mitochondrial mRNA triggered a retrograde signaling and an anterograde nuclear transcriptome response involving a series of transcription factor genes and small RNAs. Our results strongly support transcriptome coordination mechanisms within the organelles and between the organelles and the nucleus.
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Affiliation(s)
- Adnan Khan Niazi
- Institute of Plant Molecular Biology (IBMP), CNRS and University of Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg, France.
- Centre of Agricultural Biochemistry and Biotechnology (CABB), University of Agriculture, Faisalabad 38000, Pakistan.
| | - Etienne Delannoy
- Institute of Plant Sciences Paris-Saclay IPS2, CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Saclay, Paris Diderot, Sorbonne Paris-Cité, 91405 Orsay, France.
| | - Rana Khalid Iqbal
- Institute of Plant Molecular Biology (IBMP), CNRS and University of Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg, France.
| | - Daria Mileshina
- Institute of Plant Molecular Biology (IBMP), CNRS and University of Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg, France.
| | - Romain Val
- Institute of Plant Molecular Biology (IBMP), CNRS and University of Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg, France.
| | - Marta Gabryelska
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Ul. Z. Noskowskiego 12/14, 61-704 Poznan, Poland.
| | - Eliza Wyszko
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Ul. Z. Noskowskiego 12/14, 61-704 Poznan, Poland.
| | - Ludivine Soubigou-Taconnat
- Institute of Plant Sciences Paris-Saclay IPS2, CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Saclay, Paris Diderot, Sorbonne Paris-Cité, 91405 Orsay, France.
| | - Maciej Szymanski
- Department of Computational Biology, Institute of Molecular Biology and Biotechnology, A. Mickiewicz University Poznan, Ul. Umultowska 89, 61-614 Poznan, Poland.
| | - Jan Barciszewski
- Institute of Bioorganic Chemistry, Polish Academy of Sciences, Ul. Z. Noskowskiego 12/14, 61-704 Poznan, Poland.
- NanoBioMedical Centre of the Adam Mickiewicz University, Umultowska 85, 61614 Poznan, Poland.
| | - Frédérique Weber-Lotfi
- Institute of Plant Molecular Biology (IBMP), CNRS and University of Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg, France.
| | - José Manuel Gualberto
- Institute of Plant Molecular Biology (IBMP), CNRS and University of Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg, France.
| | - André Dietrich
- Institute of Plant Molecular Biology (IBMP), CNRS and University of Strasbourg, 12 rue du Général Zimmer, 67084 Strasbourg, France.
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75
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Guaragnella N, Coyne LP, Chen XJ, Giannattasio S. Mitochondria-cytosol-nucleus crosstalk: learning from Saccharomyces cerevisiae. FEMS Yeast Res 2019; 18:5066171. [PMID: 30165482 DOI: 10.1093/femsyr/foy088] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 08/02/2018] [Indexed: 12/16/2022] Open
Abstract
Mitochondria are key cell organelles with a prominent role in both energetic metabolism and the maintenance of cellular homeostasis. Since mitochondria harbor their own genome, which encodes a limited number of proteins critical for oxidative phosphorylation and protein translation, their function and biogenesis strictly depend upon nuclear control. The yeast Saccharomyces cerevisiae has been a unique model for understanding mitochondrial DNA organization and inheritance as well as for deciphering the process of assembly of mitochondrial components. In the last three decades, yeast also provided a powerful tool for unveiling the communication network that coordinates the functions of the nucleus, the cytosol and mitochondria. This crosstalk regulates how cells respond to extra- and intracellular changes either to maintain cellular homeostasis or to activate cell death. This review is focused on the key pathways that mediate nucleus-cytosol-mitochondria communications through both transcriptional regulation and proteostatic signaling. We aim to highlight yeast that likely continues to serve as a productive model organism for mitochondrial research in the years to come.
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Affiliation(s)
- Nicoletta Guaragnella
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, CNR, Via Amendola 165/A, 70126 Bari, Italy
| | - Liam P Coyne
- Department of Biochemistry and Molecular Biology, State University of New York Upstate Medical University, 750 East Adams Street, Syracuse, NY 13210, USA
| | - Xin Jie Chen
- Department of Biochemistry and Molecular Biology, State University of New York Upstate Medical University, 750 East Adams Street, Syracuse, NY 13210, USA
| | - Sergio Giannattasio
- Institute of Biomembranes, Bioenergetics and Molecular Biotechnologies, CNR, Via Amendola 165/A, 70126 Bari, Italy
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76
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Blanco NE, Liebsch D, Guinea Díaz M, Strand Å, Whelan J. Dual and dynamic intracellular localization of Arabidopsis thaliana SnRK1.1. JOURNAL OF EXPERIMENTAL BOTANY 2019; 70:2325-2338. [PMID: 30753728 DOI: 10.1093/jxb/erz023] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Accepted: 02/01/2019] [Indexed: 06/09/2023]
Abstract
Sucrose non-fermenting 1 (SNF1)-related protein kinase 1.1 (SnRK1.1; also known as KIN10 or SnRK1α) has been identified as the catalytic subunit of the complex SnRK1, the Arabidopsis thaliana homologue of a central integrator of energy and stress signalling in eukaryotes dubbed AMPK/Snf1/SnRK1. A nuclear localization of SnRK1.1 has been previously described and is in line with its function as an integrator of energy and stress signals. Here, using two biological models (Nicotiana benthamiana and Arabidopsis thaliana), native regulatory sequences, different microscopy techniques, and manipulations of cellular energy status, it was found that SnRK1.1 is localized dynamically between the nucleus and endoplasmic reticulum (ER). This distribution was confirmed at a spatial and temporal level by co-localization studies with two different fluorescent ER markers, one of them being the SnRK1.1 phosphorylation target HMGR. The ER and nuclear localization displayed a dynamic behaviour in response to perturbations of the plastidic electron transport chain. These results suggest that an ER-associated SnRK1.1 fraction might be sensing the cellular energy status, being a point of crosstalk with other ER stress regulatory pathways.
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Affiliation(s)
- Nicolás E Blanco
- Centro de Estudios Fotosintéticos y Bioquímicos, Universidad Nacional de Rosario (CEFOBI-CONICET/UNR), Rosario, Argentina
- Umeå Plant Science Centre, Department of Plant Physiologyogy, Umeå University, Sweden
| | - Daniela Liebsch
- Umeå Plant Science Centre, Department of Plant Physiologyogy, Umeå University, Sweden
- Instituto de Biología Molecular y Celular de Rosario (IBR-CONICET), Rosario, Argentina
| | - Manuel Guinea Díaz
- Molecular Plant Biology, Department of Biochemistry, University of Turku, Turku, Finland
| | - Åsa Strand
- Umeå Plant Science Centre, Department of Plant Physiologyogy, Umeå University, Sweden
| | - James Whelan
- Department of Animal, Plant and Soil Science, School of Life Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, Bundoora, Victoria, Australia
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77
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Chen W, Xue Y, Scarfe L, Wang D, Zhang Y. Loss of Prune in Circadian Cells Decreases the Amplitude of the Circadian Locomotor Rhythm in Drosophila. Front Cell Neurosci 2019; 13:76. [PMID: 30881291 PMCID: PMC6405476 DOI: 10.3389/fncel.2019.00076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 02/14/2019] [Indexed: 01/10/2023] Open
Abstract
The circadian system, which has a period of about 24 h, is import for organismal health and fitness. The molecular circadian clock consists of feedback loops involving both transcription and translation, and proper function of the circadian system also requires communication among intracellular organelles. As important hubs for signaling in the cell, mitochondria integrate a variety of signals. Mitochondrial dysfunction and disruption of circadian rhythms are observed in neurodegenerative diseases and during aging. However, how mitochondrial dysfunction influences circadian rhythm is largely unknown. Here, we report that Drosophila prune (pn), which localizes to the mitochondrial matrix, most likely affects the function of certain clock neurons.Deletion of pn in flies caused decreased expression of mitochondrial transcription factor TFAM and reductions in levels of mitochondrial DNA, which resulted in mitochondrial dysfunction. Loss of pn decreased the amplitude of circadian rhythms.In addition, we showed that depletion of mtDNA by overexpression of a mitochondrially targeted restriction enzyme mitoXhoI also decreased the robustness of circadian rhythms. Our work demonstrates that pn is important for mitochondrial function thus involved in the regulation of circadian rhythms.
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Affiliation(s)
- Wenfeng Chen
- Institute of Life Sciences, Fuzhou University, Fuzhou, China.,Department of Biology, University of Nevada, Reno, Reno, NV, United States
| | - Yongbo Xue
- Department of Biology, University of Nevada, Reno, Reno, NV, United States
| | - Lisa Scarfe
- Department of Biology, University of Nevada, Reno, Reno, NV, United States
| | - Danfeng Wang
- Institute of Applied Ecology, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Yong Zhang
- Department of Biology, University of Nevada, Reno, Reno, NV, United States
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78
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Xu Y, Yu Z, Zhang S, Wu C, Yang G, Yan K, Zheng C, Huang J. CYSTM3 negatively regulates salt stress tolerance in Arabidopsis. PLANT MOLECULAR BIOLOGY 2019; 99:395-406. [PMID: 30701352 DOI: 10.1007/s11103-019-00825-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 01/17/2019] [Indexed: 06/09/2023]
Abstract
CYSTM3, a small mitochondrial protein, acts as a negative regulator in salt stress response by preventing Na+ efflux and disturbing reactive oxygen species (ROS) homeostasis in Arabidopsis. Cysteine-rich transmembrane module (CYSTM) is a not well characterized small peptide family in plants. In this study, we identified a novel mitochondrion-localized CYSTM member CYSTM3 from Arabidopsis, which was ubiquitously expressed in different tissues and dramatically induced by salt stress. Transgenic plants overexpressing CYSTM3 (OE) displayed hypersensitivity to salt stress compared with wild type (WT) plants, whereas a knockout mutant cystm3 was more tolerant to high salinity than WT. Moreover, OE lines accumulated higher contents of Na+ and ROS than WT and cystm3 upon exposure to high salinity. Further analysis revealed that CYSTM3 could deter root Na+ efflux and inhibit the activities of a range of ROS scavenging enzymes in Arabidopsis. In addition, the transcripts of nuclear salt stress-responsive genes were over-activated in cystm3 than those in WT and OE lines. Taken together, Arabidopsis CYSTM3 acts as a negative regulator in salt stress tolerance.
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Affiliation(s)
- Yang Xu
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, People's Republic of China
| | - Zipeng Yu
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, People's Republic of China
| | - Shizhong Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, People's Republic of China
| | - Changai Wu
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, People's Republic of China
| | - Guodong Yang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, People's Republic of China
| | - Kang Yan
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, People's Republic of China
| | - Chengchao Zheng
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, People's Republic of China.
| | - Jinguang Huang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, Shandong, People's Republic of China.
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79
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Shapiguzov A, Vainonen JP, Hunter K, Tossavainen H, Tiwari A, Järvi S, Hellman M, Aarabi F, Alseekh S, Wybouw B, Van Der Kelen K, Nikkanen L, Krasensky-Wrzaczek J, Sipari N, Keinänen M, Tyystjärvi E, Rintamäki E, De Rybel B, Salojärvi J, Van Breusegem F, Fernie AR, Brosché M, Permi P, Aro EM, Wrzaczek M, Kangasjärvi J. Arabidopsis RCD1 coordinates chloroplast and mitochondrial functions through interaction with ANAC transcription factors. eLife 2019; 8:43284. [PMID: 30767893 PMCID: PMC6414205 DOI: 10.7554/elife.43284] [Citation(s) in RCA: 93] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 02/14/2019] [Indexed: 01/17/2023] Open
Abstract
Reactive oxygen species (ROS)-dependent signaling pathways from chloroplasts and mitochondria merge at the nuclear protein RADICAL-INDUCED CELL DEATH1 (RCD1). RCD1 interacts in vivo and suppresses the activity of the transcription factors ANAC013 and ANAC017, which mediate a ROS-related retrograde signal originating from mitochondrial complex III. Inactivation of RCD1 leads to increased expression of mitochondrial dysfunction stimulon (MDS) genes regulated by ANAC013 and ANAC017. Accumulating MDS gene products, including alternative oxidases (AOXs), affect redox status of the chloroplasts, leading to changes in chloroplast ROS processing and increased protection of photosynthetic apparatus. ROS alter the abundance, thiol redox state and oligomerization of the RCD1 protein in vivo, providing feedback control on its function. RCD1-dependent regulation is linked to chloroplast signaling by 3'-phosphoadenosine 5'-phosphate (PAP). Thus, RCD1 integrates organellar signaling from chloroplasts and mitochondria to establish transcriptional control over the metabolic processes in both organelles. Most plant cells contain two types of compartments, the mitochondria and the chloroplasts, which work together to supply the chemical energy required by life processes. Genes located in another part of the cell, the nucleus, encode for the majority of the proteins found in these compartments. At any given time, the mitochondria and the chloroplasts send specific, ‘retrograde’ signals to the nucleus to turn on or off the genes they need. For example, mitochondria produce molecules known as reactive oxygen species (ROS) if they are having problems generating energy. These molecules activate several regulatory proteins that move into the nucleus and switch on MDS genes, a set of genes which helps to repair the mitochondria. Chloroplasts also produce ROS that can act as retrograde signals. It is still unclear how the nucleus integrates signals from both chloroplasts and mitochondria to ‘decide’ which genes to switch on, but a protein called RCD1 may play a role in this process. Indeed, previous studies have found that Arabidopsis plants that lack RCD1 have defects in both their mitochondria and chloroplasts. In these mutant plants, the MDS genes are constantly active and the chloroplasts have problems making ROS. To investigate this further, Shapiguzov, Vainonen et al. use biochemical and genetic approaches to study RCD1 in Arabidopsis. The experiments confirm that this protein allows a dialog to take place between the retrograde signals of both mitochondria and chloroplasts. On one hand, RCD1 binds to and inhibits the regulatory proteins that usually activate the MDS genes under the control of mitochondria. This explains why, in the absence of RCD1, the MDS genes are always active, which is ultimately disturbing how these compartments work. On the other hand, RCD1 is also found to be sensitive to the ROS that chloroplasts produce. This means that chloroplasts may be able to affect when mitochondria generate energy by regulating the protein. Finally, further experiments show that MDS genes can affect both mitochondria and chloroplasts: by influencing how these genes are regulated, RCD1 therefore acts on the two types of compartments. Overall, the work by Shapiguzov, Vainonen et al. describes a new way Arabidopsis coordinates its mitochondria and chloroplasts. Further studies will improve our understanding of how plants regulate these compartments in different environments to produce the energy they need. In practice, this may also help plant breeders create new varieties of crops that produce energy more efficiently and which better resist to stress.
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Affiliation(s)
- Alexey Shapiguzov
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.,Viikki Plant Science Center, University of Helsinki, Helsinki, Finland.,Institute of Plant Physiology, Russian Academy of Sciences, Moscow, Russia
| | - Julia P Vainonen
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.,Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
| | - Kerri Hunter
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.,Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
| | - Helena Tossavainen
- Program in Structural Biology and Biophysics, Institute of Biotechnology, University of Helsinki, Helsinki, Finland.,Department of Chemistry, Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
| | - Arjun Tiwari
- Department of Biochemistry / Molecular Plant Biology, University of Turku, Turku, Finland
| | - Sari Järvi
- Department of Biochemistry / Molecular Plant Biology, University of Turku, Turku, Finland
| | - Maarit Hellman
- Department of Chemistry, Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
| | - Fayezeh Aarabi
- Max-Planck Institute for Molecular Plant Physiology, Potsdam, Germany
| | - Saleh Alseekh
- Max-Planck Institute for Molecular Plant Physiology, Potsdam, Germany.,Center of Plant System Biology and Biotechnology, Plovdiv, Bulgaria
| | - Brecht Wybouw
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium.,VIB Center for Plant Systems Biology, Ghent, Belgium
| | - Katrien Van Der Kelen
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium.,VIB Center for Plant Systems Biology, Ghent, Belgium
| | - Lauri Nikkanen
- Department of Biochemistry / Molecular Plant Biology, University of Turku, Turku, Finland
| | - Julia Krasensky-Wrzaczek
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.,Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
| | - Nina Sipari
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.,Viikki Metabolomics Unit, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Markku Keinänen
- Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland
| | - Esa Tyystjärvi
- Department of Biochemistry / Molecular Plant Biology, University of Turku, Turku, Finland
| | - Eevi Rintamäki
- Department of Biochemistry / Molecular Plant Biology, University of Turku, Turku, Finland
| | - Bert De Rybel
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium.,VIB Center for Plant Systems Biology, Ghent, Belgium
| | - Jarkko Salojärvi
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.,Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
| | - Frank Van Breusegem
- Department of Plant Biotechnology and Bioinformatics, Ghent University, Ghent, Belgium.,VIB Center for Plant Systems Biology, Ghent, Belgium
| | - Alisdair R Fernie
- Max-Planck Institute for Molecular Plant Physiology, Potsdam, Germany.,Center of Plant System Biology and Biotechnology, Plovdiv, Bulgaria
| | - Mikael Brosché
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.,Viikki Plant Science Center, University of Helsinki, Helsinki, Finland.,Institute of Technology, University of Tartu, Tartu, Estonia
| | - Perttu Permi
- Program in Structural Biology and Biophysics, Institute of Biotechnology, University of Helsinki, Helsinki, Finland.,Department of Chemistry, Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland.,Department of Biological and Environmental Science, Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
| | - Eva-Mari Aro
- Department of Biochemistry / Molecular Plant Biology, University of Turku, Turku, Finland
| | - Michael Wrzaczek
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.,Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
| | - Jaakko Kangasjärvi
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland.,Viikki Plant Science Center, University of Helsinki, Helsinki, Finland
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80
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Xu Y, Berkowitz O, Narsai R, De Clercq I, Hooi M, Bulone V, Van Breusegem F, Whelan J, Wang Y. Mitochondrial function modulates touch signalling in Arabidopsis thaliana. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2019; 97:623-645. [PMID: 30537160 DOI: 10.1111/tpj.14183] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Revised: 11/16/2018] [Accepted: 11/21/2018] [Indexed: 05/28/2023]
Abstract
Plants respond to short- and long-term mechanical stimuli, via altered transcript abundance and growth respectively. Jasmonate, gibberellic acid and calcium have been implicated in mediating responses to mechanical stimuli. Previously it has been shown that the transcript abundance for the outer mitochondrial membrane protein of 66 kDa (OM66), is induced several fold after 30 min in response to touch. Therefore, the effect of mitochondrial function on the response to mechanical stimulation by touch at 30 min was investigated. Twenty-five mutants targeting mitochondrial function or regulators revealed that all affected the touch transcriptome. Double and triple mutants revealed synergistic or antagonistic effects following the observed responses in the single mutants. Changes in the touch-responsive transcriptome were localised, recurring with repeated rounds of stimulus. The gene expression kinetics after repeated touch were complex, displaying five distinct patterns. These transcriptomic responses were altered by some regulators of mitochondrial retrograde signalling, such as cyclic dependent protein kinase E1, a kinase protein in the mediator complex, and KIN10 (SnRK1 - sucrose non-fermenting related protein kinase 1), revealing an overlap between the touch response and mitochondrial stress signalling and alternative mitochondrial metabolic pathways. Regulatory network analyses revealed touch-induced stress responses and suppressed growth and biosynthetic processes. Interaction with the phytohormone signalling pathways indicated that ethylene and gibberellic acid had the greatest effect. Hormone measurements revealed that mutations of genes that encoded mitochondrial proteins altered hormone concentrations. Mitochondrial function modulates touch-induced changes in gene expression directly through altered regulatory networks, and indirectly via altering hormonal levels.
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Affiliation(s)
- Yue Xu
- Department of Animal, Plant and Soil Sciences, School of Life Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
| | - Oliver Berkowitz
- Department of Animal, Plant and Soil Sciences, School of Life Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
| | - Reena Narsai
- Department of Animal, Plant and Soil Sciences, School of Life Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
| | - Inge De Clercq
- Department of Plant Biotechnology and Bioinformatics, Ghent University, (Technologiepark 71), 9052, Ghent, Belgium
- VIB Center for Plant Systems Biology, (Technologiepark 71), 9052, Ghent, Belgium
| | - Michelle Hooi
- ARC Centre of Excellence in Plant Cell Walls and Adelaide Glycomics, School of Agriculture Food and Wine, The University of Adelaide, Waite Campus, Urrbrae, Australia
| | - Vincent Bulone
- ARC Centre of Excellence in Plant Cell Walls and Adelaide Glycomics, School of Agriculture Food and Wine, The University of Adelaide, Waite Campus, Urrbrae, Australia
| | - Frank Van Breusegem
- Department of Plant Biotechnology and Bioinformatics, Ghent University, (Technologiepark 71), 9052, Ghent, Belgium
- VIB Center for Plant Systems Biology, (Technologiepark 71), 9052, Ghent, Belgium
| | - James Whelan
- Department of Animal, Plant and Soil Sciences, School of Life Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
| | - Yan Wang
- Department of Animal, Plant and Soil Sciences, School of Life Sciences, Australian Research Council Centre of Excellence in Plant Energy Biology, La Trobe University, 5 Ring Road, Bundoora, 3086, Victoria, Australia
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81
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Abstract
Cellular homeostasis requires precise communication between various types of organelles. In particular, the communication between nucleus and semiautonomous organelles, mitochondria and chloroplasts, has received widespread attention. Communication from nucleus to other organelles is known as anterograde signaling, whereas communication from mitochondria or chloroplasts to the nucleus is known as retrograde signaling. Here we discuss methods used to study retrograde signaling in Arabidopsis thaliana. These methods may also be modified to study retrograde signaling in other plant species.
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82
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Takenaka S, Yamamoto R, Nakamura C. Genetic diversity of submergence stress response in cytoplasms of the Triticum-Aegilops complex. Sci Rep 2018; 8:16267. [PMID: 30390041 PMCID: PMC6214928 DOI: 10.1038/s41598-018-34682-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 10/23/2018] [Indexed: 12/21/2022] Open
Abstract
Genetic diversity in cytoplasmic and nuclear genomes and their interaction affecting adaptive traits is an attractive research subject in plants. We addressed submergence stress response of wheat that has become increasingly important but remained largely uninvestigated. Our primary aim was to disclose cytoplasmic diversity using nucleus-cytoplasm (NC) hybrids possessing a series of heterologous cytoplasms in a common nuclear background. Effects of submergence on seedling emergence and growth from imbibed seeds were studied and compared with euplasmic lines. Marked phenotypic variabilities were observed among both lines, demonstrating divergent cytoplasmic and nuclear effects on submergence response. NC hybrids with cytoplasm of Aegilops mutica showed a less inhibition, indicative of their positive contribution to submergence tolerance, whereas cytoplasms of Aegilops umbellulata and related species caused a greater inhibition. Superoxide dismutase (SOD) activity showed a marked increase accompanied by retardation of seedling growth in a susceptible NC hybrid. The observation suggested that the elevated SOD activity was resulted from a high level of reactive oxygen species accumulated and remained in susceptible seedlings. Taken together, our results point to the usefulness of NC hybrids in further studies needed to clarify molecular mechanisms underlying the nucleus-cytoplasm interaction regulating submergence stress response in wheat.
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Affiliation(s)
- Shotaro Takenaka
- Department of Plant Life Science, Faculty of Agriculture, Ryukoku University, 1-5 Yokotani, Ohe-cho, Seta, Otsu, 520-2194, Japan
| | - Ryohei Yamamoto
- Department of Plant Life Science, Faculty of Agriculture, Ryukoku University, 1-5 Yokotani, Ohe-cho, Seta, Otsu, 520-2194, Japan
| | - Chiharu Nakamura
- Department of Plant Life Science, Faculty of Agriculture, Ryukoku University, 1-5 Yokotani, Ohe-cho, Seta, Otsu, 520-2194, Japan.
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83
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Faddetta T, Abbate L, Renzone G, Palumbo Piccionello A, Maggio A, Oddo E, Scaloni A, Puglia AM, Gallo G, Carimi F, Fatta Del Bosco S, Mercati F. An integrated proteomic and metabolomic study to evaluate the effect of nucleus-cytoplasm interaction in a diploid citrus cybrid between sweet orange and lemon. PLANT MOLECULAR BIOLOGY 2018; 98:407-425. [PMID: 30341661 DOI: 10.1007/s11103-018-0787-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 10/10/2018] [Indexed: 06/08/2023]
Abstract
Our results provide a comprehensive overview how the alloplasmic condition might lead to a significant improvement in citrus plant breeding, developing varieties more adaptable to a wide range of conditions. Citrus cybrids resulting from somatic hybridization hold great potential in plant improvement. They represent effective products resulting from the transfer of organelle-encoded traits into cultivated varieties. In these cases, the plant coordinated array of physiological, biochemical, and molecular functions remains the result of integration among different signals, which derive from the compartmentalized genomes of nucleus, plastids and mitochondria. To dissect the effects of genome rearrangement into cybrids, a multidisciplinary study was conducted on a diploid cybrid (C2N), resulting from a breeding program aimed to improve interesting agronomical traits for lemon, the parental cultivars 'Valencia' sweet orange (V) and 'femminello' lemon (F), and the corresponding somatic allotetraploid hybrid (V + F). In particular, a differential proteomic analysis, based on 2D-DIGE and MS procedures, was carried out on leaf proteomes of C2N, V, F and V + F, using the C2N proteome as pivotal condition. This investigation revealed differentially represented protein patterns that can be associated with genome rearrangement and cell compartment interplay. Interestingly, most of the up-regulated proteins in the cybrid are involved in crucial biological processes such as photosynthesis, energy production and stress tolerance response. The cybrid differential proteome pattern was concomitant with a general increase of leaf gas exchange and content of volatile organic compounds, highlighting a stimulation of specific pathways that can be related to observed plant performances. Our results contribute to a better understanding how the alloplasmic condition might lead to a substantial improvement in plant breeding, opening new opportunities to develop varieties more adaptable to a wide range of conditions.
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Affiliation(s)
- Teresa Faddetta
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Palermo, Italy
- Advanced Technologies Network (ATeN) Center, University of Palermo, Palermo, Italy
| | - Loredana Abbate
- Institute of Biosciences and Bioresources (IBBR), National Research Council, Palermo, Italy
| | - Giovanni Renzone
- Proteomics & Mass Spectrometry Laboratory, ISPAAM, National Research Council, Naples, Italy
| | - Antonio Palumbo Piccionello
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Palermo, Italy
| | - Antonella Maggio
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Palermo, Italy
| | - Elisabetta Oddo
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Palermo, Italy
| | - Andrea Scaloni
- Proteomics & Mass Spectrometry Laboratory, ISPAAM, National Research Council, Naples, Italy
| | - Anna Maria Puglia
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Palermo, Italy
| | - Giuseppe Gallo
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies (STEBICEF), University of Palermo, Palermo, Italy
- Advanced Technologies Network (ATeN) Center, University of Palermo, Palermo, Italy
| | - Francesco Carimi
- Institute of Biosciences and Bioresources (IBBR), National Research Council, Palermo, Italy
| | - Sergio Fatta Del Bosco
- Institute of Biosciences and Bioresources (IBBR), National Research Council, Palermo, Italy
| | - Francesco Mercati
- Institute of Biosciences and Bioresources (IBBR), National Research Council, Palermo, Italy.
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84
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Zhang Y, Lv Y, Jahan N, Chen G, Ren D, Guo L. Sensing of Abiotic Stress and Ionic Stress Responses in Plants. Int J Mol Sci 2018; 19:E3298. [PMID: 30352959 PMCID: PMC6275032 DOI: 10.3390/ijms19113298] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 10/21/2018] [Accepted: 10/23/2018] [Indexed: 01/30/2023] Open
Abstract
Plants need to cope with complex environments throughout their life cycle. Abiotic stresses, including drought, cold, salt and heat, can cause a reduction in plant growth and loss of crop yield. Plants sensing stress signals and adapting to adverse environments are fundamental biological problems. We review the stress sensors in stress sensing and the responses, and then discuss ionic stress signaling and the responses. During ionic stress, the calcineurin B-like proteins (CBL) and CBL-interacting protein kinases (CBL-CIPK) complex is identified as a primary element of the calcium sensor for perceiving environmental signals. The CBL-CIPK system shows specificity and variety in its response to different stresses. Obtaining a deeper understanding of stress signaling and the responses will mitigate or solve crop yield crises in extreme environments with fast-growing populations.
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Affiliation(s)
- Yu Zhang
- State Key Lab for Rice Biology, China National Rice Research Institute, Hangzhou 310006, China.
| | - Yang Lv
- State Key Lab for Rice Biology, China National Rice Research Institute, Hangzhou 310006, China.
| | - Noushin Jahan
- State Key Lab for Rice Biology, China National Rice Research Institute, Hangzhou 310006, China.
| | - Guang Chen
- State Key Lab for Rice Biology, China National Rice Research Institute, Hangzhou 310006, China.
| | - Deyong Ren
- State Key Lab for Rice Biology, China National Rice Research Institute, Hangzhou 310006, China.
| | - Longbiao Guo
- State Key Lab for Rice Biology, China National Rice Research Institute, Hangzhou 310006, China.
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85
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Brew-Appiah RAT, Sanguinet KA. Considerations of AOX Functionality Revealed by Critical Motifs and Unique Domains. Int J Mol Sci 2018; 19:ijms19102972. [PMID: 30274246 PMCID: PMC6213860 DOI: 10.3390/ijms19102972] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Revised: 09/14/2018] [Accepted: 09/28/2018] [Indexed: 12/28/2022] Open
Abstract
An understanding of the genes and mechanisms regulating environmental stress in crops is critical for boosting agricultural yield and safeguarding food security. Under adverse conditions, response pathways are activated for tolerance or resistance. In multiple species, the alternative oxidase (AOX) genes encode proteins which help in this process. Recently, this gene family has been extensively investigated in the vital crop plants, wheat, barley and rice. Cumulatively, these three species and/or their wild ancestors contain the genes for AOX1a, AOX1c, AOX1e, and AOX1d, and common patterns in the protein isoforms have been documented. Here, we add more information on these trends by emphasizing motifs that could affect expression, and by utilizing the most recent discoveries from the AOX isoform in Trypanosoma brucei to highlight clade-dependent biases. The new perspectives may have implications on how the AOX gene family has evolved and functions in monocots. The common or divergent amino acid substitutions between these grasses and the parasite are noted, and the potential effects of these changes are discussed. There is the hope that the insights gained will inform the way future AOX research is performed in monocots, in order to optimize crop production for food, feed, and fuel.
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Affiliation(s)
- Rhoda A T Brew-Appiah
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164-6420, USA.
| | - Karen A Sanguinet
- Department of Crop and Soil Sciences, Washington State University, Pullman, WA 99164-6420, USA.
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86
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Podgórska A, Ostaszewska-Bugajska M, Tarnowska A, Burian M, Borysiuk K, Gardeström P, Szal B. Nitrogen Source Dependent Changes in Central Sugar Metabolism Maintain Cell Wall Assembly in Mitochondrial Complex I-Defective frostbite1 and Secondarily Affect Programmed Cell Death. Int J Mol Sci 2018; 19:ijms19082206. [PMID: 30060552 PMCID: PMC6121878 DOI: 10.3390/ijms19082206] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 07/20/2018] [Accepted: 07/24/2018] [Indexed: 12/13/2022] Open
Abstract
For optimal plant growth, carbon and nitrogen availability needs to be tightly coordinated. Mitochondrial perturbations related to a defect in complex I in the Arabidopsis thalianafrostbite1 (fro1) mutant, carrying a point mutation in the 8-kD Fe-S subunit of NDUFS4 protein, alter aspects of fundamental carbon metabolism, which is manifested as stunted growth. During nitrate nutrition, fro1 plants showed a dominant sugar flux toward nitrogen assimilation and energy production, whereas cellulose integration in the cell wall was restricted. However, when cultured on NH4+ as the sole nitrogen source, which typically induces developmental disorders in plants (i.e., the ammonium toxicity syndrome), fro1 showed improved growth as compared to NO3− nourishing. Higher energy availability in fro1 plants was correlated with restored cell wall assembly during NH4+ growth. To determine the relationship between mitochondrial complex I disassembly and cell wall-related processes, aspects of cell wall integrity and sugar and reactive oxygen species signaling were analyzed in fro1 plants. The responses of fro1 plants to NH4+ treatment were consistent with the inhibition of a form of programmed cell death. Resistance of fro1 plants to NH4+ toxicity coincided with an absence of necrotic lesion in plant leaves.
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Affiliation(s)
- Anna Podgórska
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland.
| | - Monika Ostaszewska-Bugajska
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland.
| | - Agata Tarnowska
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland.
| | - Maria Burian
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland.
| | - Klaudia Borysiuk
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland.
| | - Per Gardeström
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, SE-90187 Umeå, Sweden, .
| | - Bożena Szal
- Institute of Experimental Plant Biology and Biotechnology, Faculty of Biology, University of Warsaw, I. Miecznikowa 1, 02-096 Warsaw, Poland.
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87
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Van Ruyskensvelde V, Van Breusegem F, Van Der Kelen K. Post-transcriptional regulation of the oxidative stress response in plants. Free Radic Biol Med 2018; 122:181-192. [PMID: 29496616 DOI: 10.1016/j.freeradbiomed.2018.02.032] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 02/22/2018] [Accepted: 02/23/2018] [Indexed: 12/30/2022]
Abstract
Due to their sessile lifestyle, plants can be exposed to several kinds of stresses that will increase the production of reactive oxygen species (ROS), such as hydrogen peroxide, singlet oxygen, and hydroxyl radicals, in the plant cells and activate several signaling pathways that cause alterations in the cellular metabolism. Nevertheless, when ROS production outreaches a certain level, oxidative damage to nucleic acids, lipids, metabolites, and proteins will occur, finally leading to cell death. Until now, the most comprehensive and detailed readout of oxidative stress responses is undoubtedly obtained at the transcriptome level. However, transcript levels often do not correlate with the corresponding protein levels. Indeed, together with transcriptional regulations, post-transcriptional, translational, and/or post-translational regulations will shape the active proteome. Here, we review the current knowledge on the post-transcriptional gene regulation during the oxidative stress responses in planta.
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Affiliation(s)
- Valerie Van Ruyskensvelde
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium; Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium
| | - Frank Van Breusegem
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium; Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium.
| | - Katrien Van Der Kelen
- Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium; Center for Plant Systems Biology, VIB, 9052 Ghent, Belgium
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88
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Czarnocka W, Karpiński S. Friend or foe? Reactive oxygen species production, scavenging and signaling in plant response to environmental stresses. Free Radic Biol Med 2018; 122:4-20. [PMID: 29331649 DOI: 10.1016/j.freeradbiomed.2018.01.011] [Citation(s) in RCA: 284] [Impact Index Per Article: 47.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 12/17/2017] [Accepted: 01/09/2018] [Indexed: 01/11/2023]
Abstract
In the natural environment, plants are exposed to a variety of biotic and abiotic stress conditions that trigger rapid changes in the production and scavenging of reactive oxygen species (ROS). The production and scavenging of ROS is compartmentalized, which means that, depending on stimuli type, they can be generated and eliminated in different cellular compartments such as the apoplast, plasma membrane, chloroplasts, mitochondria, peroxisomes, and endoplasmic reticulum. Although the accumulation of ROS is generally harmful to cells, ROS play an important role in signaling pathways that regulate acclimatory and defense responses in plants, such as systemic acquired acclimation (SAA) and systemic acquired resistance (SAR). However, high accumulations of ROS can also trigger redox homeostasis disturbance which can lead to cell death, and in consequence, to a limitation in biomass and yield production. Different ROS have various half-lifetimes and degrees of reactivity toward molecular components such as lipids, proteins, and nucleic acids. Thus, they play different roles in intra- and extra-cellular signaling. Despite their possible damaging effect, ROS should mainly be considered as signaling molecules that regulate local and systemic acclimatory and defense responses. Over the past two decades it has been proven that ROS together with non-photochemical quenching (NPQ), hormones, Ca2+ waves, and electrical signals are the main players in SAA and SAR, two physiological processes essential for plant survival and productivity in unfavorable conditions.
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Affiliation(s)
- Weronika Czarnocka
- Department of Plant Genetics, Breeding and Biotechnology, Faculty of Horticulture, Biotechnology and Landscape Architecture, Warsaw University of Life Sciences (SGGW), Nowoursynowska Street 159, 02-776 Warsaw, Poland; Department of Botany, Faculty of Agriculture and Biology, Warsaw University of Life Sciences (SGGW), Nowoursynowska Street 159, 02-776 Warsaw, Poland
| | - Stanisław Karpiński
- Department of Plant Genetics, Breeding and Biotechnology, Faculty of Horticulture, Biotechnology and Landscape Architecture, Warsaw University of Life Sciences (SGGW), Nowoursynowska Street 159, 02-776 Warsaw, Poland; The Plant Breeding and Acclimatization Institute (IHAR) - National Research Institute, Radzików, 05-870 Błonie, Poland.
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89
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Crawford T, Lehotai N, Strand Å. The role of retrograde signals during plant stress responses. JOURNAL OF EXPERIMENTAL BOTANY 2018; 69:2783-2795. [PMID: 29281071 DOI: 10.1093/jxb/erx481] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 12/11/2017] [Indexed: 05/23/2023]
Abstract
Chloroplast and mitochondria not only provide the energy to the plant cell but due to the sensitivity of organellar processes to perturbations caused by abiotic stress, they are also key cellular sensors of environmental fluctuations. Abiotic stresses result in reduced photosynthetic efficiency and thereby reduced energy supply for cellular processes. Thus, in order to acclimate to stress, plants must re-program gene expression and cellular metabolism to divert energy from growth and developmental processes to stress responses. To restore cellular energy homeostasis following exposure to stress, the activities of the organelles must be tightly co-ordinated with the transcriptional re-programming in the nucleus. Thus, communication between the organelles and the nucleus, so-called retrograde signalling, is essential to direct the energy use correctly during stress exposure. Stress-triggered retrograde signals are mediated by reactive oxygen species and metabolites including β-cyclocitral, MEcPP (2-C-methyl-d-erythritol 2,4-cyclodiphosphate), PAP (3'-phosphoadenosine 5'-phosphate), and intermediates of the tetrapyrrole biosynthesis pathway. However, for the plant cell to respond optimally to environmental stress, these stress-triggered retrograde signalling pathways must be integrated with the cytosolic stress signalling network. We hypothesize that the Mediator transcriptional co-activator complex may play a key role as a regulatory hub in the nucleus, integrating the complex stress signalling networks originating in different cellular compartments.
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Affiliation(s)
- Tim Crawford
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden
| | - Nóra Lehotai
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden
| | - Åsa Strand
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå University, Umeå, Sweden
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90
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Broda M, Millar AH, Van Aken O. Mitophagy: A Mechanism for Plant Growth and Survival. TRENDS IN PLANT SCIENCE 2018; 23:434-450. [PMID: 29576328 DOI: 10.1016/j.tplants.2018.02.010] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Revised: 02/13/2018] [Accepted: 02/23/2018] [Indexed: 05/17/2023]
Abstract
Mitophagy is a conserved cellular process that is important for autophagic removal of damaged mitochondria to maintain a healthy mitochondrial population. Mitophagy also appears to occur in plants and has roles in development, stress response, senescence, and programmed cell death. However, many of the genes that control mitophagy in yeast and animal cells are absent from plants, and no plant proteins marking defunct mitochondria for autophagic degradation are yet known. New insights implicate general autophagy-related proteins in mitophagy, affecting the senescence of plant tissues. Mitophagy control and its importance for energy metabolism, survival, signaling, and cell death in plants are discussed. Furthermore, we suggest mitochondrial membrane proteins containing ATG8-interacting motifs, which might serve as mitophagy receptor proteins in plant mitochondria.
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Affiliation(s)
- Martyna Broda
- Australian Research Council (ARC) Centre of Excellence in Plant Energy Biology, University of Western Australia, Crawley, Western Australia, Australia
| | - A Harvey Millar
- Australian Research Council (ARC) Centre of Excellence in Plant Energy Biology, University of Western Australia, Crawley, Western Australia, Australia
| | - Olivier Van Aken
- Department of Biology, Lund University, Sölvegatan 35, 223 62 Lund, Sweden.
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91
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Karpinska B, Alomrani SO, Foyer CH. Inhibitor-induced oxidation of the nucleus and cytosol in Arabidopsis thaliana: implications for organelle to nucleus retrograde signalling. Philos Trans R Soc Lond B Biol Sci 2018; 372:rstb.2016.0392. [PMID: 28808105 PMCID: PMC5566886 DOI: 10.1098/rstb.2016.0392] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/01/2017] [Indexed: 11/14/2022] Open
Abstract
Concepts of organelle-to-nucleus signalling pathways are largely based on genetic screens involving inhibitors of chloroplast and mitochondrial functions such as norflurazon, lincomycin (LINC), antimycin A (ANT) and salicylhydroxamic acid. These inhibitors favour enhanced cellular oxidation, but their precise effects on the cellular redox state are unknown. Using the in vivo reduction–oxidation (redox) reporter, roGFP2, inhibitor-induced changes in the glutathione redox potentials of the nuclei and cytosol were measured in Arabidopsis thaliana root, epidermal and stomatal guard cells, together with the expression of nuclear-encoded chloroplast and mitochondrial marker genes. All the chloroplast and mitochondrial inhibitors increased the degree of oxidation in the nuclei and cytosol. However, inhibitor-induced oxidation was less marked in stomatal guard cells than in epidermal or root cells. Moreover, LINC and ANT caused a greater oxidation of guard cell nuclei than the cytosol. Chloroplast and mitochondrial inhibitors significantly decreased the abundance of LHCA1 and LHCB1 transcripts. The levels of WHY1, WHY3 and LEA5 transcripts were increased in the presence of inhibitors. Chloroplast inhibitors decreased AOXA1 mRNA levels, while mitochondrial inhibitors had the opposite effect. Inhibitors that are used to characterize retrograde signalling pathways therefore have similar general effects on cellular redox state and gene expression. This article is part of the themed issue ‘Enhancing photosynthesis in crop plants: targets for improvement’.
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Affiliation(s)
- Barbara Karpinska
- Centre for Plant Sciences, School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Sarah Owdah Alomrani
- Centre for Plant Sciences, School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
| | - Christine H Foyer
- Centre for Plant Sciences, School of Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK
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92
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Zhao Y, Luo L, Xu J, Xin P, Guo H, Wu J, Bai L, Wang G, Chu J, Zuo J, Yu H, Huang X, Li J. Malate transported from chloroplast to mitochondrion triggers production of ROS and PCD in Arabidopsis thaliana. Cell Res 2018. [PMID: 29540758 PMCID: PMC5939044 DOI: 10.1038/s41422-018-0024-8] [Citation(s) in RCA: 103] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Programmed cell death (PCD) is a fundamental biological process. Deficiency in MOSAIC DEATH 1 (MOD1), a plastid-localized enoyl-ACP reductase, leads to the accumulation of reactive oxygen species (ROS) and PCD, which can be suppressed by mitochondrial complex I mutations, indicating a signal from chloroplasts to mitochondria. However, this signal remains to be elucidated. In this study, through cloning and analyzing a series of mod1 suppressors, we reveal a comprehensive organelle communication pathway that regulates the generation of mitochondrial ROS and triggers PCD. We show that mutations in PLASTIDIAL NAD-DEPENDENT MALATE DEHYDROGENASE (plNAD-MDH), chloroplastic DICARBOXYLATE TRANSPORTER 1 (DiT1) and MITOCHONDRIAL MALATE DEHYDROGENASE 1 (mMDH1) can each rescue the ROS accumulation and PCD phenotypes in mod1, demonstrating a direct communication from chloroplasts to mitochondria via the malate shuttle. Further studies demonstrate that these elements play critical roles in the redox homeostasis and plant growth under different photoperiod conditions. Moreover, we reveal that the ROS level and PCD are significantly increased in malate-treated HeLa cells, which can be dramatically attenuated by knockdown of the human gene MDH2, an ortholog of Arabidopsis mMDH1. These results uncover a conserved malate-induced PCD pathway in plant and animal systems, revolutionizing our understanding of the communication between organelles.
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Affiliation(s)
- Yannan Zhao
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Lilan Luo
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jiesi Xu
- State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Peiyong Xin
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Hongyan Guo
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jian Wu
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.,Department of Plant Science, Weizmann Institute of Science, Rehovot, 7610001, Israel
| | - Lin Bai
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Guodong Wang
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jinfang Chu
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jianru Zuo
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hong Yu
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Xun Huang
- University of Chinese Academy of Sciences, Beijing, 100049, China. .,State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Jiayang Li
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China. .,University of Chinese Academy of Sciences, Beijing, 100049, China.
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93
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Transcriptome Analyses of Mosaic (MSC) Mitochondrial Mutants of Cucumber in a Highly Inbred Nuclear Background. G3-GENES GENOMES GENETICS 2018; 8:953-965. [PMID: 29330162 PMCID: PMC5844315 DOI: 10.1534/g3.117.300321] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Cucumber (Cucumis sativus L.) has a large, paternally transmitted mitochondrial genome. Cucumber plants regenerated from cell cultures occasionally show paternally transmitted mosaic (MSC) phenotypes, characterized by slower growth, chlorotic patterns on the leaves and fruit, lower fertility, and rearrangements in their mitochondrial DNAs (mtDNAs). MSC lines 3, 12, and 16 originated from different cell cultures all established using the highly inbred, wild-type line B. These MSC lines possess different rearrangements and under-represented regions in their mtDNAs. We completed RNA-seq on normalized and non-normalized cDNA libraries from MSC3, MSC12, and MSC16 to study their nuclear gene-expression profiles relative to inbred B. Results from both libraries indicated that gene expression in MSC12 and MSC16 were more similar to each other than MSC3. Forty-one differentially expressed genes (DEGs) were upregulated and one downregulated in the MSC lines relative to B. Gene functional classifications revealed that more than half of these DEGs are associated with stress-response pathways. Consistent with this observation, we detected elevated levels of hydrogen peroxide throughout leaf tissue in all MSC lines compared to wild-type line B. These results demonstrate that independently produced MSC lines with different mitochondrial polymorphisms show unique and shared nuclear responses. This study revealed genes associated with stress response that could become selection targets to develop cucumber cultivars with increased stress tolerance, and further support of cucumber as a model plant to study nuclear-mitochondrial interactions.
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94
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Abstract
Programmed cell death (PCD) is a controlled mechanism that eliminates specific cells under developmental or environmental stimuli. All organisms-from bacteria to multicellular eukaryotes-have the ability to induce PCD in selected cells. Although this process was first identified in plants, the interest in deciphering the signaling pathways leading to PCD strongly increased when evidence came to light that PCD may be involved in several human diseases. In plants, PCD activation ensures the correct occurrence of growth and developmental processes, among which embryogenesis and differentiation of tracheary elements. PCD is also part of the defense responses activated by plants against environmental stresses, both abiotic and biotic.This chapter gives an overview of the roles of PCD in plants as well as the problems arising in classifying different kinds of PCD according to defined biochemical and cellular markers, and in comparison with the various types of PCD occurring in mammal cells. The importance of understanding PCD signaling pathways, with their elicitors and effectors, in order to improve plant productivity and resistance to environmental stresses is also taken into consideration.
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Affiliation(s)
- Vittoria Locato
- Food Sciences and Human Nutrition Unit, Università Campus Bio-Medico di Roma, Rome, Italy.
| | - Laura De Gara
- Food Sciences and Human Nutrition Unit, Università Campus Bio-Medico di Roma, Rome, Italy
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95
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Xu H, Zhang L, Li R, Wang X, Liu S, Liu X, Jing Y, Xiao J. SKL1 Is Essential for Chloroplast Development in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2018; 9:179. [PMID: 29515603 PMCID: PMC5826214 DOI: 10.3389/fpls.2018.00179] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The Arabidopsis shikimate kinase-like 1 (skl1-8) mutant is characterized by a pigment-defective phenotype. Although the related phenotypical defect mainly has been attributed to the blocking of chloroplast development, the molecular functions of SKL1 remain largely unknown. In this study, we combined multiple approaches to investigate the potential functions of SKL1. Results showed that the skl1-8 mutant exhibited an albino phenotype and had dramatically reduced chlorophyll content as a consequence of a single nuclear recessive gene mutation. Chemical complementation analysis indicated that SKL1 does not function as SK enzyme in the shikimate pathway. In addition, by chlorophyll fluorescence parameters and immunoblot analysis, the levels of photosynthetic proteins are substantially reduced. Moreover, by transcriptome analysis, specific groups of nuclear genes involved in photosynthesis, such as light-harvesting complex, pigment metabolism, carbon metabolism, and chloroplast gene expression, were down-regulated, whereas several defense and oxidative stress responsive genes were up-regulated in the skl1-8 mutant compared with the wide type. Furthermore, we found the expression of genes related to auxin transport and response was repressed in the skl1-8 mutant, probable suggesting that SKL1 is involved in auxin-related pathways during chloroplast development. Together, these results provide a useful reference for characterization of SKL1 function during chloroplast biogenesis and development.
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Affiliation(s)
- Huimin Xu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing, China
- College of Life Sciences, Peking University, Beijing, China
| | - Liwen Zhang
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing, China
| | - Ruili Li
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing, China
| | - Xinwei Wang
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing, China
| | - Shuai Liu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing, China
| | - Xiaomin Liu
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing, China
| | - Yanping Jing
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing, China
| | - Jianwei Xiao
- Beijing Advanced Innovation Center for Tree Breeding by Molecular Design, Beijing Forestry University, Beijing, China
- College of Biological Sciences and Biotechnology, Beijing Forestry University, Beijing, China
- *Correspondence: Jianwei Xiao,
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96
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Che-Othman MH, Millar AH, Taylor NL. Connecting salt stress signalling pathways with salinity-induced changes in mitochondrial metabolic processes in C3 plants. PLANT, CELL & ENVIRONMENT 2017; 40:2875-2905. [PMID: 28741669 DOI: 10.1111/pce.13034] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Revised: 06/26/2017] [Accepted: 07/09/2017] [Indexed: 05/12/2023]
Abstract
Salinity exerts a severe detrimental effect on crop yields globally. Growth of plants in saline soils results in physiological stress, which disrupts the essential biochemical processes of respiration, photosynthesis, and transpiration. Understanding the molecular responses of plants exposed to salinity stress can inform future strategies to reduce agricultural losses due to salinity; however, it is imperative that signalling and functional response processes are connected to tailor these strategies. Previous research has revealed the important role that plant mitochondria play in the salinity response of plants. Review of this literature shows that 2 biochemical processes required for respiratory function are affected under salinity stress: the tricarboxylic acid cycle and the transport of metabolites across the inner mitochondrial membrane. However, the mechanisms by which components of these processes are affected or react to salinity stress are still far from understood. Here, we examine recent findings on the signal transduction pathways that lead to adaptive responses of plants to salinity and discuss how they can be involved in and be affected by modulation of the machinery of energy metabolism with attention to the role of the tricarboxylic acid cycle enzymes and mitochondrial membrane transporters in this process.
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Affiliation(s)
- M Hafiz Che-Othman
- ARC Centre of Excellence in Plant Energy Biology, School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia, WA 6009, Australia
- School of Bioscience and Biotechnology, Faculty of Science and Technology, National University of Malaysia, Bangi, Selangor, 43600, Malaysia
| | - A Harvey Millar
- ARC Centre of Excellence in Plant Energy Biology, School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia, WA 6009, Australia
| | - Nicolas L Taylor
- ARC Centre of Excellence in Plant Energy Biology, School of Molecular Sciences, The University of Western Australia, Crawley, Western Australia, WA 6009, Australia
- Institute of Agriculture, The University of Western Australia, Crawley, Western Australia, WA 6009, Australia
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97
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Wang P, Khoshravesh R, Karki S, Tapia R, Balahadia CP, Bandyopadhyay A, Quick WP, Furbank R, Sage TL, Langdale JA. Re-creation of a Key Step in the Evolutionary Switch from C 3 to C 4 Leaf Anatomy. Curr Biol 2017; 27:3278-3287.e6. [PMID: 29056456 PMCID: PMC5678070 DOI: 10.1016/j.cub.2017.09.040] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 09/18/2017] [Accepted: 09/19/2017] [Indexed: 12/26/2022]
Abstract
The C4 photosynthetic pathway accounts for ∼25% of primary productivity on the planet despite being used by only 3% of species. Because C4 plants are higher yielding than C3 plants, efforts are underway to introduce the C4 pathway into the C3 crop rice. This is an ambitious endeavor; however, the C4 pathway evolved from C3 on multiple independent occasions over the last 30 million years, and steps along the trajectory are evident in extant species. One approach toward engineering C4 rice is to recapitulate this trajectory, one of the first steps of which was a change in leaf anatomy. The transition from C3 to so-called "proto-Kranz" anatomy requires an increase in organelle volume in sheath cells surrounding leaf veins. Here we induced chloroplast and mitochondrial development in rice vascular sheath cells through constitutive expression of maize GOLDEN2-LIKE genes. Increased organelle volume was accompanied by the accumulation of photosynthetic enzymes and by increased intercellular connections. This suite of traits reflects that seen in "proto-Kranz" species, and, as such, a key step toward engineering C4 rice has been achieved.
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Affiliation(s)
- Peng Wang
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK
| | - Roxana Khoshravesh
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON M5S3B2, Canada
| | - Shanta Karki
- International Rice Research Institute (IRRI), Los Banos 4030, Laguna, the Philippines
| | - Ronald Tapia
- International Rice Research Institute (IRRI), Los Banos 4030, Laguna, the Philippines
| | - C Paolo Balahadia
- International Rice Research Institute (IRRI), Los Banos 4030, Laguna, the Philippines
| | - Anindya Bandyopadhyay
- International Rice Research Institute (IRRI), Los Banos 4030, Laguna, the Philippines
| | - W Paul Quick
- International Rice Research Institute (IRRI), Los Banos 4030, Laguna, the Philippines; Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
| | - Robert Furbank
- CSIRO, Canberra, ACT 2601, Australia; ARC Centre of Excellence for Translational Photosynthesis, Research School of Biology, Australian National University, Acton, ACT 2601, Australia
| | - Tammy L Sage
- Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, ON M5S3B2, Canada.
| | - Jane A Langdale
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK.
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98
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Hsieh WY, Liao JC, Wang HT, Hung TH, Tseng CC, Chung TY, Hsieh MH. The Arabidopsis thiamin-deficient mutant pale green1 lacks thiamin monophosphate phosphatase of the vitamin B 1 biosynthesis pathway. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2017; 91:145-157. [PMID: 28346710 DOI: 10.1111/tpj.13552] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Revised: 03/20/2017] [Accepted: 03/21/2017] [Indexed: 05/24/2023]
Abstract
Thiamin diphosphate (TPP, vitamin B1 ) is an essential coenzyme present in all organisms. Animals obtain TPP from their diets, but plants synthesize TPPde novo. We isolated and characterized an Arabidopsis pale green1 (pale1) mutant that contained higher concentrations of thiamin monophosphate (TMP) and less thiamin and TPP than the wild type. Supplementation with thiamin, but not the thiazole and pyrimidine precursors, rescued the mutant phenotype, indicating that the pale1 mutant is a thiamin-deficient mutant. Map-based cloning and whole-genome sequencing revealed that the pale1 mutant has a mutation in At5g32470 encoding a TMP phosphatase of the TPP biosynthesis pathway. We further confirmed that the mutation of At5g32470 is responsible for the mutant phenotypes by complementing the pale1 mutant with constructs overexpressing full-length At5g32470. Most plant TPP biosynthetic enzymes are located in the chloroplasts and cytosol, but At5g32470-GFP localized to the mitochondrion of the root, hypocotyl, mesophyll and guard cells of the 35S:At5g32470-GFP complemented plants. The subcellular localization of a functional TMP phosphatase suggests that the complete vitamin B1 biosynthesis pathway may involve the chloroplasts, mitochondria and cytosol in plants. Analysis of PALE1 promoter-uidA activity revealed that PALE1 is mainly expressed in vascular tissues of Arabidopsis seedlings. Quantitative RT-PCR analysis of TPP biosynthesis genes and genes encoding the TPP-dependent enzymes pyruvate dehydrogenase, α-ketoglutarate dehydrogenase and transketolase revealed that the transcript levels of these genes were upregulated in the pale1 mutant. These results suggest that endogenous levels of TPP may affect the expression of genes involved in TPP biosynthesis and TPP-dependent enzymes.
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Affiliation(s)
- Wei-Yu Hsieh
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, 11529, Taiwan
| | - Jo-Chien Liao
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, 11529, Taiwan
| | - Hsin-Tzu Wang
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, 11529, Taiwan
| | - Tzu-Huan Hung
- Biotechnology Division, Taiwan Agricultural Research Institute, Taichung, 41362, Taiwan
| | - Ching-Chih Tseng
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, 11529, Taiwan
| | - Tsui-Yun Chung
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, 11529, Taiwan
| | - Ming-Hsiun Hsieh
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei, 11529, Taiwan
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99
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Lee K, Han JH, Park YI, Colas des Francs-Small C, Small I, Kang H. The mitochondrial pentatricopeptide repeat protein PPR19 is involved in the stabilization of NADH dehydrogenase 1 transcripts and is crucial for mitochondrial function and Arabidopsis thaliana development. THE NEW PHYTOLOGIST 2017; 215:202-216. [PMID: 28332713 DOI: 10.1111/nph.14528] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 02/19/2017] [Indexed: 05/06/2023]
Abstract
Despite the importance of pentatricopeptide repeat (PPR) proteins in organellar RNA metabolism and plant development, the functions of many PPR proteins remain unknown. Here, we determined the role of a mitochondrial PPR protein (At1g52620) comprising 19 PPR motifs, thus named PPR19, in Arabidopsis thaliana. The ppr19 mutant displayed abnormal seed development, reduced seed yield, delayed seed germination, and retarded growth, indicating that PPR19 is indispensable for normal growth and development of Arabidopsis thaliana. Splicing pattern analysis of mitochondrial genes revealed that PPR19 specifically binds to the specific sequence in the 3'-terminus of the NADH dehydrogenase 1 (nad1) transcript and stabilizes transcripts containing the second and third exons of nad1. Loss of these transcripts in ppr19 leads to multiple secondary effects on accumulation and splicing of other nad1 transcripts, from which we can infer the order in which cis- and trans-spliced nad1 transcripts are normally processed. Improper splicing of nad1 transcripts leads to the absence of mitochondrial complex I and alteration of the nuclear transcriptome, notably influencing the alternative splicing of a variety of nuclear genes. Our results indicate that the mitochondrial PPR19 is an essential component in the splicing of nad1 transcripts, which is crucial for mitochondrial function and plant development.
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Affiliation(s)
- Kwanuk Lee
- Department of Plant Biotechnology, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, 61186, Korea
| | - Ji Hoon Han
- Department of Plant Biotechnology, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, 61186, Korea
| | - Youn-Il Park
- Department of Biological Sciences, Chungnam National University, Daejeon, 306-764, Korea
| | - Catherine Colas des Francs-Small
- ARC Centre of Excellence in Plant Energy Biology, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia
| | - Ian Small
- ARC Centre of Excellence in Plant Energy Biology, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia
| | - Hunseung Kang
- Department of Plant Biotechnology, College of Agriculture and Life Sciences, Chonnam National University, Gwangju, 61186, Korea
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100
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Convergence of mitochondrial and chloroplastic ANAC017/PAP-dependent retrograde signalling pathways and suppression of programmed cell death. Cell Death Differ 2017; 24:955-960. [PMID: 28498364 DOI: 10.1038/cdd.2017.68] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2016] [Revised: 03/04/2017] [Accepted: 04/03/2017] [Indexed: 12/23/2022] Open
Abstract
The energy-converting organelles mitochondria and chloroplasts are tightly embedded in cellular metabolism and stress response. To appropriately control organelle function, extensive regulatory mechanisms are at play that involve two-way exchange between the nucleus and mitochondria/chloroplasts. In recent years, our understanding of how mitochondria and chloroplasts provide 'retrograde' feedback to the nucleus, resulting in targeted transcriptional changes, has greatly increased. Nevertheless, mitochondrial and chloroplast retrograde signalling have largely been studied independently, and only few points of interaction have been found or proposed. Through reassessment of recent publications, this perspective proposes that two of the most well-studied retrograde signalling pathways in plants, those mediated by ANAC017 and those mediated by phosphoadenosine phosphate (PAP), are most likely convergent and can direct overlapping genes. Furthermore, at least part of this common retrograde response appears targeted towards suppression of programmed cell death (PCD) triggered by organellar defects. The identified target genes are discussed in light of their roles in PCD suppression and amplifying the signalling cascade via positive-feedback loops. Finally, a mechanism is proposed that may explain why the convergence of PAP/ANAC017-dependent signalling appears capable of suppressing some types of PCD lesions, but not others, based on the subcellular location of the initial PCD-inducing dysfunction.
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