1
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Eysholdt-Derzsó E, Hause B, Sauter M, Schmidt-Schippers RR. Hypoxia reshapes Arabidopsis root architecture by integrating ERF-VII factor response and abscisic acid homoeostasis. PLANT, CELL & ENVIRONMENT 2024; 47:2879-2894. [PMID: 38616485 DOI: 10.1111/pce.14914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 04/02/2024] [Accepted: 04/04/2024] [Indexed: 04/16/2024]
Abstract
Oxygen limitation (hypoxia), arising as a key stress factor due to flooding, negatively affects plant development. Consequently, maintaining root growth under such stress is crucial for plant survival, yet we know little about the root system's adaptions to low-oxygen conditions and its regulation by phytohormones. In this study, we examine the impact of hypoxia and, herein, the regulatory role of group VII ETHYLENE-RESPONSE FACTOR (ERFVII) transcription factors on root growth in Arabidopsis. We found lateral root (LR) elongation to be actively maintained by hypoxia via ERFVII factors, as erfVII seedlings possess hypersensitivity towards hypoxia regarding their LR growth. Pharmacological inhibition of abscisic acid (ABA) biosynthesis revealed ERFVII-driven counteraction of hypoxia-induced inhibition of LR formation in an ABA-dependent manner. However, postemergence LR growth under hypoxia mediated by ERFVIIs was independent of ABA. In roots, ERFVIIs mediate, among others, the induction of ABA-degrading ABA 8'-hydroxylases CYP707A1 expression. RAP2.12 could activate the pCYC707A1:LUC reporter gene, indicating, combined with single mutant analyses, that this transcription factor regulates ABA levels through corresponding transcript upregulation. Collectively, hypoxia-induced adaptation of the Arabidopsis root system is shaped by developmental reprogramming, whereby ERFVII-dependent promotion of LR emergence, but not elongation, is partly executed through regulation of ABA degradation.
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Affiliation(s)
| | - Bettina Hause
- Department of Cell and Metabolic Biology, Leibniz Institute of Plant Biochemistry, Halle, Germany
| | - Margret Sauter
- Plant Developmental Biology and Plant Physiology, University of Kiel, Kiel, Germany
| | - Romy R Schmidt-Schippers
- Department of Plant Biotechnology, University of Bielefeld, Institute of Biology, Bielefeld, Germany
- Center for Biotechnology, University of Bielefeld, Bielefeld, Germany
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2
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Jighly A. Boosting genome-wide association power and genomic prediction accuracy for date palm fruit traits with advanced statistics. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2024; 344:112110. [PMID: 38704095 DOI: 10.1016/j.plantsci.2024.112110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Revised: 03/05/2024] [Accepted: 04/30/2024] [Indexed: 05/06/2024]
Abstract
The date palm is economically vital in the Middle East and North Africa, providing essential fibres, vitamins, and carbohydrates. Understanding the genetic architecture of its traits remains complex due to the tree's perennial nature and long generation times. This study aims to address these complexities by employing advanced genome-wide association (GWAS) and genomic prediction models using previously published data involving fruit acid content, sugar content, dimension, and colour traits. The multivariate GWAS model identified seven QTL, including five novel associations, that shed light on the genetic control of these traits. Furthermore, the research evaluates different genomic prediction models that considered genotype by environment and genotype by trait interactions. While colour- traits demonstrate strong predictive power, other traits display moderate accuracies across different models and scenarios aligned with the expectations when using small reference populations. When designing the cross-validation to predict new individuals, the accuracy of the best multi-trait model was significantly higher than all single-trait models for dimension traits, but not for the remaining traits, which showed similar performances. However, the cross-validation strategy that masked random phenotypic records (i.e., mimicking the unbalanced phenotypic records) showed significantly higher accuracy for all traits except acid contents. The findings underscore the importance of understanding genetic architecture for informed breeding strategies. The research emphasises the need for larger population sizes and multivariate models to enhance gene tagging power and predictive accuracy to advance date palm breeding programs. These findings support more targeted breeding in date palm, improving productivity and resilience to various environments.
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3
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Liang Y, Weng X, Ling H, Mustafa G, Yang B, Lu N. Transcriptomic Insights into Molecular Response of Butter Lettuce to Different Light Wavelengths. PLANTS (BASEL, SWITZERLAND) 2024; 13:1582. [PMID: 38931014 PMCID: PMC11207648 DOI: 10.3390/plants13121582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 04/25/2024] [Accepted: 05/01/2024] [Indexed: 06/28/2024]
Abstract
Lettuce is a widely consumed leafy vegetable; it became popular due to its enhanced nutritional content. Recently, lettuce is also regarded as one of the model plants for vegetable production in plant factories. Light and nutrients are essential environmental factors that affect lettuce growth and morphology. To evaluate the impact of light spectra on lettuce, butter lettuce was grown under the light wavelengths of 460, 525, and 660 nm, along with white light as the control. Plant morphology, physiology, nutritional content, and transcriptomic analyses were performed to study the light response mechanisms. The results showed that the leaf fresh weight and length/width were higher when grown at 460 nm and lower when grown at 525 nm compared to the control treatment. When exposed to 460 nm light, the sugar, crude fiber, mineral, and vitamin concentrations were favorably altered; however, these levels decreased when exposed to light with a wavelength of 525 nm. The transcriptomic analysis showed that co-factor and vitamin metabolism- and secondary metabolism-related genes were specifically induced by 460 nm light exposure. Furthermore, the pathway enrichment analysis found that flavonoid biosynthesis- and vitamin B6 metabolism-related genes were significantly upregulated in response to 460 nm light exposure. Additional experiments demonstrated that the vitamin B6 and B2 content was significantly higher in leaves exposed to 460 nm light than those grown under the other conditions. Our findings suggested that the addition of 460 nm light could improve lettuce's biomass and nutritional value and help us to further understand how the light spectrum can be tuned as needed for lettuce production.
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Affiliation(s)
- Yongqi Liang
- Shanxi Qingmei Biotechnology Company Limited, Baoji 721000, China
| | - Xinying Weng
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310000, China; (X.W.); (H.L.); (B.Y.)
| | - Hao Ling
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310000, China; (X.W.); (H.L.); (B.Y.)
| | - Ghazala Mustafa
- Department of Plant Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan;
| | - Bingxian Yang
- College of Life Sciences and Medicine, Zhejiang Sci-Tech University, Hangzhou 310000, China; (X.W.); (H.L.); (B.Y.)
| | - Na Lu
- Center for Environment, Health and Field Sciences, Chiba University, 6-2-1 Kashiwanoha, Kashiwa 277-0882, Japan
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4
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Zhang Y, Huang X, Zhang L, Gao W, Ma J, Chen T, Yang D. Genome-wide identification, gene expression and haplotype analysis of the rhomboid-like gene family in wheat (Triticum aestivum L.). THE PLANT GENOME 2024; 17:e20435. [PMID: 38348504 DOI: 10.1002/tpg2.20435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 01/08/2024] [Accepted: 01/23/2024] [Indexed: 07/02/2024]
Abstract
The rhomboid-like (RBL) gene encodes serine protease, which plays an important role in the response to cell development and diverse stresses. However, genome-wide identification, expression profiles, and haplotype analysis of the RBL family genes have not been performed in wheat (Triticum aestivum L.). This study investigated the phylogeny and diversity of the RBL family genes in the wheat genome through various approaches, including gene structure analysis, evolutionary relationship analysis, promoter cis-acting element analysis, expression pattern analysis, and haplotype analysis. The 41 TaRBL genes were identified and divided into five subfamilies in the wheat genome. RBL family genes were expanded through segmented duplication and purification selection. The cis-element analysis revealed their involvement in various stress responses and plant development. The results of RNA-seq and quantitative real-time-PCR showed that TaRBL genes displayed higher expression levels in developing spike/grain and were differentially regulated under polyethylene glycol, NaCl, and abscisic acid treatments, indicating their roles in grain development and abiotic stress response. A kompetitive allele-specific PCR molecular marker was developed to confirm the single nucleotide polymorphism of TaRBL14a gene in 263 wheat accessions. We found that the elite haplotype TaRBL14a-Hap2 showed a significantly higher 1000-grain weight than TaRBL14a-Hap11 in at least three environments, and the TaRBL14a-Hap2 was positively selected in wheat breeding. The findings will provide a good insight into the evolutionary and functional characteristics of the TaRBL genes family in wheat and lay the foundation for future exploration of the regulatory mechanisms of TaRBL genes in plant growth and development, as well as their response to abiotic stresses.
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Affiliation(s)
- Yanyan Zhang
- State Key Laboratory of Aridland Crop Science, Lanzhou, China
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Xiaoya Huang
- State Key Laboratory of Aridland Crop Science, Lanzhou, China
| | - Long Zhang
- State Key Laboratory of Aridland Crop Science, Lanzhou, China
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Weidong Gao
- State Key Laboratory of Aridland Crop Science, Lanzhou, China
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Jingfu Ma
- State Key Laboratory of Aridland Crop Science, Lanzhou, China
- College of Agronomy, Gansu Agricultural University, Lanzhou, China
| | - Tao Chen
- State Key Laboratory of Aridland Crop Science, Lanzhou, China
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, China
| | - Delong Yang
- State Key Laboratory of Aridland Crop Science, Lanzhou, China
- College of Life Science and Technology, Gansu Agricultural University, Lanzhou, China
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5
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Talukdar S, Mal S, Kundu P. Physico-chemical features and functional relevance of tomato rhomboid proteases. Int J Biol Macromol 2024; 272:132681. [PMID: 38806088 DOI: 10.1016/j.ijbiomac.2024.132681] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 05/13/2024] [Accepted: 05/24/2024] [Indexed: 05/30/2024]
Abstract
In plants, regulated intramembrane proteolysis (RIP) is crucial for proper growth, development, and stress management. Rhomboid proteases (RPs) residing in the membrane play a vital role in orchestrating RIP. Although RPs can be found in most sequenced genomes, tomato rhomboids (SlRPs) have not yet been studied. Using alternative and comprehensive strategies, we found ten SlRPs encoded in the tomato genome. These SlRPs possess signature motifs and transmembrane domains, showing structural similarity to other members of the RP family. Also, SlRPs are genetically related to other known RPs of the Solanaceae family. Seven of the SlRPs retain serine-histidine catalytic dyads, making them proteolytically active, while three iRhoms lack the dyad and other structural motifs. Although SlRPs could have functional redundancy, their distribution and expression pattern indicate tissue specificity and responsiveness to specific external stimuli. The presence of development and stress-response-related cis-elements in the promoters of SlRPs supports this view. Furthermore, our strategically designed substrate-reporter assay shows that SlRPs have proteolytic activity similar to that of known RPs. This study provides a detailed understanding of all SlRPs and their physico-chemical features, shedding light on their involvement in physiological processes.
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Affiliation(s)
- Sushmita Talukdar
- Department of Biological Sciences, Bose Institute, EN80, Sector V, Bidhannagar, Kolkata 700091, India
| | - Sayan Mal
- Department of Biological Sciences, Bose Institute, EN80, Sector V, Bidhannagar, Kolkata 700091, India
| | - Pallob Kundu
- Department of Biological Sciences, Bose Institute, EN80, Sector V, Bidhannagar, Kolkata 700091, India.
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6
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Shu L, Li L, Jiang YQ, Yan J. Advances in membrane-tethered NAC transcription factors in plants. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2024; 342:112034. [PMID: 38365003 DOI: 10.1016/j.plantsci.2024.112034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 02/08/2024] [Accepted: 02/11/2024] [Indexed: 02/18/2024]
Abstract
Transcription factors are central components in cell signal transduction networks and are critical regulators for gene expression. It is estimated that approximately 10% of all transcription factors are membrane-tethered. MTFs (membrane-bound transcription factors) are latent transcription factors that are inherently anchored in the cellular membrane in a dormant form. When plants encounter environmental stimuli, they will be released from the membrane by intramembrane proteases or by the ubiquitin proteasome pathway and then were translocated to the nucleus. The capacity to instantly activate dormant transcription factors is a critical strategy for modulating diverse cellular functions in response to external or internal signals, which provides an important transcriptional regulatory network in response to sudden stimulus and improves plant survival. NTLs (NTM1-like) are a small subset of NAC (NAM, ATAF1/2, CUC2) transcription factors, which contain a conserved NAC domain at the N-terminus and a transmembrane domain at the C-terminus. In the past two decades, several NTLs have been identified from several species, and most of them are involved in both development and stress response. In this review, we review the reports and findings on NTLs in plants and highlight the mechanism of their nuclear import as well as their functions in regulating plant growth and stress response.
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Affiliation(s)
- Lin Shu
- College of Plant Protection, Henan Agricultural University, Zhengzhou, Henan province 450002, China
| | - Longhui Li
- College of Plant Protection, Henan Agricultural University, Zhengzhou, Henan province 450002, China
| | - Yuan-Qing Jiang
- State Key Laboratory of Crop Stress Biology for Arid Areas and, College of Life Sciences, Northwest A & F University, Yangling, Shaanxi province 712100, China
| | - Jingli Yan
- College of Plant Protection, Henan Agricultural University, Zhengzhou, Henan province 450002, China.
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7
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Marathe S, Grotewold E, Otegui MS. Should I stay or should I go? Trafficking of plant extra-nuclear transcription factors. THE PLANT CELL 2024; 36:1524-1539. [PMID: 38163635 PMCID: PMC11062434 DOI: 10.1093/plcell/koad277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 09/21/2023] [Indexed: 01/03/2024]
Abstract
At the heart of all biological processes lies the control of nuclear gene expression, which is primarily achieved through the action of transcription factors (TFs) that generally contain a nuclear localization signal (NLS) to facilitate their transport into the nucleus. However, some TFs reside in the cytoplasm in a transcriptionally inactive state and only enter the nucleus in response to specific signals, which in plants include biotic or abiotic stresses. These extra-nuclear TFs can be found in the cytosol or associated with various membrane systems, including the endoplasmic reticulum and plasma membrane. They may be integral proteins with transmembrane domains or associate peripherally with the lipid bilayer via acylation or membrane-binding domains. Although over 30 plant TFs, most of them involved in stress responses, have been experimentally shown to reside outside the nucleus, computational predictions suggest that this number is much larger. Understanding how extra-nuclear TFs are trafficked into the nucleus is essential for reconstructing transcriptional regulatory networks that govern major cellular pathways in response to biotic and abiotic signals. Here, we provide a perspective on what is known on plant extranuclear-nuclear TF retention, nuclear trafficking, and the post-translational modifications that ultimately enable them to regulate gene expression upon entering the nucleus.
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Affiliation(s)
- Sarika Marathe
- Department of Botany, University of Wisconsin-Madison, Madison, WI 53706, USA
- Center for Quantitative Cell Imaging, University of Wisconsin-Madison, Madison, WI 53706, USA
| | - Erich Grotewold
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824-6473, USA
| | - Marisa S Otegui
- Department of Botany, University of Wisconsin-Madison, Madison, WI 53706, USA
- Center for Quantitative Cell Imaging, University of Wisconsin-Madison, Madison, WI 53706, USA
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8
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Sloan DB, Conover JL, Grover CE, Wendel JF, Sharbrough J. Polyploid plants take cytonuclear perturbations in stride. THE PLANT CELL 2024; 36:829-839. [PMID: 38267606 PMCID: PMC10980399 DOI: 10.1093/plcell/koae021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 01/05/2024] [Accepted: 01/05/2024] [Indexed: 01/26/2024]
Abstract
Hybridization in plants is often accompanied by nuclear genome doubling (allopolyploidy), which has been hypothesized to perturb interactions between nuclear and organellar (mitochondrial and plastid) genomes by creating imbalances in the relative copy number of these genomes and producing genetic incompatibilities between maternally derived organellar genomes and the half of the allopolyploid nuclear genome from the paternal progenitor. Several evolutionary responses have been predicted to ameliorate these effects, including selection for changes in protein sequences that restore cytonuclear interactions; biased gene retention/expression/conversion favoring maternal nuclear gene copies; and fine-tuning of relative cytonuclear genome copy numbers and expression levels. Numerous recent studies, however, have found that evolutionary responses are inconsistent and rarely scale to genome-wide generalities. The apparent robustness of plant cytonuclear interactions to allopolyploidy may reflect features that are general to allopolyploids such as the lack of F2 hybrid breakdown under disomic inheritance, and others that are more plant-specific, including slow sequence divergence in organellar genomes and preexisting regulatory responses to changes in cell size and endopolyploidy during development. Thus, cytonuclear interactions may only rarely act as the main barrier to establishment of allopolyploid lineages, perhaps helping to explain why allopolyploidy is so pervasive in plant evolution.
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Affiliation(s)
- Daniel B Sloan
- Department of Biology, Colorado State University,
Fort Collins, CO, USA
| | - Justin L Conover
- Department of Ecology and Evolutionary Biology, University of
Arizona, Tucson, AZ, USA
- Department of Molecular and Cellular Biology, University of
Arizona, Tucson, AZ, USA
| | - Corrinne E Grover
- Department of Ecology, Evolution, and Organismal Biology, Iowa State
University, Ames, IA, USA
| | - Jonathan F Wendel
- Department of Ecology, Evolution, and Organismal Biology, Iowa State
University, Ames, IA, USA
| | - Joel Sharbrough
- Department of Biology, New Mexico Institute of Mining and
Technology, Socorro, NM, USA
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9
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Triozzi PM, Brunello L, Novi G, Ferri G, Cardarelli F, Loreti E, Perales M, Perata P. Spatiotemporal oxygen dynamics in young leaves reveal cyclic hypoxia in plants. MOLECULAR PLANT 2024; 17:377-394. [PMID: 38243593 DOI: 10.1016/j.molp.2024.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 01/11/2024] [Accepted: 01/15/2024] [Indexed: 01/21/2024]
Abstract
Oxygen is essential for plant growth and development. Hypoxia occurs in plants due to limited oxygen availability following adverse environmental conditions as well in hypoxic niches in otherwise normoxic environments. However, the existence and functional integration of spatiotemporal oxygen dynamics with plant development remains unknown. In animal systems dynamic fluctuations in oxygen availability are known as cyclic hypoxia. In this study, we demonstrate that cyclic fluctuations in internal oxygen levels occur in young emerging leaves of Arabidopsis plants. Cyclic hypoxia in plants is based on a mechanism requiring the ETHYLENE RESPONSE FACTORS type VII (ERFVII) that are central components of the oxygen-sensing machinery in plants. The ERFVII-dependent mechanism allows precise adjustment of leaf growth in response to carbon status and oxygen availability within plant cells. This study thus establishes a functional connection between internal spatiotemporal oxygen dynamics and developmental processes of plants.
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Affiliation(s)
- Paolo M Triozzi
- PlantLab, Center of Plant Sciences, Sant'Anna School of Advanced Studies, 56010 Pisa, Italy; Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM)-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA-CSIC), Campus de Montegancedo UPM, Pozuelo de Alarcón, 28223 Madrid, Spain
| | - Luca Brunello
- PlantLab, Center of Plant Sciences, Sant'Anna School of Advanced Studies, 56010 Pisa, Italy
| | - Giacomo Novi
- PlantLab, Center of Plant Sciences, Sant'Anna School of Advanced Studies, 56010 Pisa, Italy
| | | | - Francesco Cardarelli
- Laboratorio NEST, Scuola Normale Superiore, Istituto Nanoscienze-CNR, Piazza S. Silvestro, 12, 56127 Pisa, Italy
| | - Elena Loreti
- Institute of Agricultural Biology and Biotechnology, National Research Council, 56124 Pisa, Italy
| | - Mariano Perales
- Centro de Biotecnología y Genómica de Plantas, Universidad Politécnica de Madrid (UPM)-Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA-CSIC), Campus de Montegancedo UPM, Pozuelo de Alarcón, 28223 Madrid, Spain; Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid (UPM), 28040 Madrid, Spain
| | - Pierdomenico Perata
- PlantLab, Center of Plant Sciences, Sant'Anna School of Advanced Studies, 56010 Pisa, Italy.
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10
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Renziehausen T, Frings S, Schmidt-Schippers R. 'Against all floods': plant adaptation to flooding stress and combined abiotic stresses. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2024; 117:1836-1855. [PMID: 38217848 DOI: 10.1111/tpj.16614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 11/28/2023] [Accepted: 12/15/2023] [Indexed: 01/15/2024]
Abstract
Current climate change brings with it a higher frequency of environmental stresses, which occur in combination rather than individually leading to massive crop losses worldwide. In addition to, for example, drought stress (low water availability), also flooding (excessive water) can threaten the plant, causing, among others, an energy crisis due to hypoxia, which is responded to by extensive transcriptional, metabolic and growth-related adaptations. While signalling during flooding is relatively well understood, at least in model plants, the molecular mechanisms of combinatorial flooding stress responses, for example, flooding simultaneously with salinity, temperature stress and heavy metal stress or sequentially with drought stress, remain elusive. This represents a significant gap in knowledge due to the fact that dually stressed plants often show unique responses at multiple levels not observed under single stress. In this review, we (i) consider possible effects of stress combinations from a theoretical point of view, (ii) summarize the current state of knowledge on signal transduction under single flooding stress, (iii) describe plant adaptation responses to flooding stress combined with four other abiotic stresses and (iv) propose molecular components of combinatorial flooding (hypoxia) stress adaptation based on their reported dual roles in multiple stresses. This way, more future emphasis may be placed on deciphering molecular mechanisms of combinatorial flooding stress adaptation, thereby potentially stimulating development of molecular tools to improve plant resilience towards multi-stress scenarios.
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Affiliation(s)
- Tilo Renziehausen
- Plant Biotechnology, Faculty of Biology, University of Bielefeld, 33615, Bielefeld, Germany
- Center for Biotechnology, University of Bielefeld, 33615, Bielefeld, Germany
| | - Stephanie Frings
- Plant Biotechnology, Faculty of Biology, University of Bielefeld, 33615, Bielefeld, Germany
- Center for Biotechnology, University of Bielefeld, 33615, Bielefeld, Germany
| | - Romy Schmidt-Schippers
- Plant Biotechnology, Faculty of Biology, University of Bielefeld, 33615, Bielefeld, Germany
- Center for Biotechnology, University of Bielefeld, 33615, Bielefeld, Germany
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11
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Porcher A, Kangasjärvi S. Plant biology: Unlocking mitochondrial stress signals. Curr Biol 2024; 34:R59-R61. [PMID: 38262360 DOI: 10.1016/j.cub.2023.12.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
Environmental stress induces mitochondrial retrograde signals that prompt protective responses in plants. The elusive mitochondrial signal has now been uncovered in a new study, which identifies formation of reactive oxygen species inside mitochondria as the key trigger of stress signals.
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Affiliation(s)
- Alexis Porcher
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, Department of Agricultural Sciences, Faculty of Agriculture and Forestry, Viikki Plant Science Center, University of Helsinki, FI-00014 Helsinki, Finland
| | - Saijaliisa Kangasjärvi
- Organismal and Evolutionary Biology Research Programme, Faculty of Biological and Environmental Sciences, Department of Agricultural Sciences, Faculty of Agriculture and Forestry, Viikki Plant Science Center, University of Helsinki, FI-00014 Helsinki, Finland.
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12
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Khan K, Tran HC, Mansuroglu B, Önsell P, Buratti S, Schwarzländer M, Costa A, Rasmusson AG, Van Aken O. Mitochondria-derived reactive oxygen species are the likely primary trigger of mitochondrial retrograde signaling in Arabidopsis. Curr Biol 2024; 34:327-342.e4. [PMID: 38176418 DOI: 10.1016/j.cub.2023.12.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 10/28/2023] [Accepted: 12/04/2023] [Indexed: 01/06/2024]
Abstract
Besides their central function in respiration, plant mitochondria play a crucial role in maintaining cellular homeostasis during stress by providing "retrograde" feedback to the nucleus. Despite the growing understanding of this signaling network, the nature of the signals that initiate mitochondrial retrograde regulation (MRR) in plants remains unknown. Here, we investigated the dynamics and causative relationship of a wide range of mitochondria-related parameters for MRR, using a combination of Arabidopsis fluorescent protein biosensor lines, in vitro assays, and genetic and pharmacological approaches. We show that previously linked physiological parameters, including changes in cytosolic ATP, NADH/NAD+ ratio, cytosolic reactive oxygen species (ROS), pH, free Ca2+, and mitochondrial membrane potential, may often be correlated with-but are not the primary drivers of-MRR induction in plants. However, we demonstrate that the induced production of mitochondrial ROS is the likely primary trigger for MRR induction in Arabidopsis. Furthermore, we demonstrate that mitochondrial ROS-mediated signaling uses the ER-localized ANAC017-pathway to induce MRR response. Finally, our data suggest that mitochondrially generated ROS can induce MRR without substantially leaking into other cellular compartments such as the cytosol or ER lumen, as previously proposed. Overall, our results offer compelling evidence that mitochondrial ROS elevation is the likely trigger of MRR.
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Affiliation(s)
- Kasim Khan
- Department of Biology, Lund University, Sölvegatan 35, Lund 223 62, Sweden
| | - Huy Cuong Tran
- Department of Biology, Lund University, Sölvegatan 35, Lund 223 62, Sweden
| | - Berivan Mansuroglu
- Department of Biology, Lund University, Sölvegatan 35, Lund 223 62, Sweden
| | - Pinar Önsell
- Department of Biology, Lund University, Sölvegatan 35, Lund 223 62, Sweden
| | - Stefano Buratti
- Department of Biosciences, University of Milan, Via G. Celoria 26, Milan 20133, Italy
| | - Markus Schwarzländer
- Plant Energy Biology Lab, Institute of Plant Biology and Biotechnology, University of Münster, Schlossplatz 8, 48143 Münster, Germany
| | - Alex Costa
- Department of Biosciences, University of Milan, Via G. Celoria 26, Milan 20133, Italy; Institute of Biophysics, Consiglio Nazionale delle Ricerche, Via G. Celoria 26, 20133 Milan, Italy
| | - Allan G Rasmusson
- 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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13
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Bakshi A, Choi WG, Kim SH, Gilroy S. The vacuolar Ca 2+ transporter CATION EXCHANGER 2 regulates cytosolic calcium homeostasis, hypoxic signaling, and response to flooding in Arabidopsis thaliana. THE NEW PHYTOLOGIST 2023; 240:1830-1847. [PMID: 37743731 DOI: 10.1111/nph.19274] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 08/23/2023] [Indexed: 09/26/2023]
Abstract
Flooding represents a major threat to global agricultural productivity and food security, but plants are capable of deploying a suite of adaptive responses that can lead to short- or longer-term survival to this stress. One cellular pathway thought to help coordinate these responses is via flooding-triggered Ca2+ signaling. We have mined publicly available transcriptomic data from Arabidopsis subjected to flooding or low oxygen stress to identify rapidly upregulated, Ca2+ -related transcripts. We then focused on transporters likely to modulate Ca2+ signals. Candidates emerging from this analysis included AUTOINHIBITED Ca2+ ATPASE 1 and CATION EXCHANGER 2. We therefore assayed mutants in these genes for flooding sensitivity at levels from growth to patterns of gene expression and the kinetics of flooding-related Ca2+ changes. Knockout mutants in CAX2 especially showed enhanced survival to soil waterlogging coupled with suppressed induction of many marker genes for hypoxic response and constitutive activation of others. CAX2 mutants also generated larger and more sustained Ca2+ signals in response to both flooding and hypoxic challenges. CAX2 is a Ca2+ transporter located on the tonoplast, and so these results are consistent with an important role for vacuolar Ca2+ transport in the signaling systems that trigger flooding response.
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Affiliation(s)
- Arkadipta Bakshi
- Department of Botany, University of Wisconsin, Birge Hall, 430 Lincoln Dr., Madison, WI, 53706, USA
| | - Won-Gyu Choi
- Department of Biochemistry and Molecular Biology, 1664 N. Virginia St, Reno, NV, 89557, USA
| | - Su-Hwa Kim
- Department of Biochemistry and Molecular Biology, 1664 N. Virginia St, Reno, NV, 89557, USA
| | - Simon Gilroy
- Department of Botany, University of Wisconsin, Birge Hall, 430 Lincoln Dr., Madison, WI, 53706, USA
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Sevilla F, Martí MC, De Brasi-Velasco S, Jiménez A. Redox regulation, thioredoxins, and glutaredoxins in retrograde signalling and gene transcription. JOURNAL OF EXPERIMENTAL BOTANY 2023; 74:5955-5969. [PMID: 37453076 PMCID: PMC10575703 DOI: 10.1093/jxb/erad270] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Accepted: 07/12/2023] [Indexed: 07/18/2023]
Abstract
Integration of reactive oxygen species (ROS)-mediated signal transduction pathways via redox sensors and the thiol-dependent signalling network is of increasing interest in cell biology for their implications in plant growth and productivity. Redox regulation is an important point of control in protein structure, interactions, cellular location, and function, with thioredoxins (TRXs) and glutaredoxins (GRXs) being key players in the maintenance of cellular redox homeostasis. The crosstalk between second messengers, ROS, thiol redox signalling, and redox homeostasis-related genes controls almost every aspect of plant development and stress response. We review the emerging roles of TRXs and GRXs in redox-regulated processes interacting with other cell signalling systems such as organellar retrograde communication and gene expression, especially in plants during their development and under stressful environments. This approach will cast light on the specific role of these proteins as redox signalling components, and their importance in different developmental processes during abiotic stress.
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Affiliation(s)
- Francisca Sevilla
- Abiotic Stress, Production and Quality Laboratory, Department of Stress Biology and Plant Pathology, CEBAS-CSIC, Murcia, Spain
| | - Maria Carmen Martí
- Abiotic Stress, Production and Quality Laboratory, Department of Stress Biology and Plant Pathology, CEBAS-CSIC, Murcia, Spain
| | - Sabrina De Brasi-Velasco
- Abiotic Stress, Production and Quality Laboratory, Department of Stress Biology and Plant Pathology, CEBAS-CSIC, Murcia, Spain
| | - Ana Jiménez
- Abiotic Stress, Production and Quality Laboratory, Department of Stress Biology and Plant Pathology, CEBAS-CSIC, Murcia, Spain
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