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Hou S, Rodrigues O, Liu Z, Shan L, He P. Small holes, big impact: Stomata in plant-pathogen-climate epic trifecta. MOLECULAR PLANT 2024; 17:26-49. [PMID: 38041402 PMCID: PMC10872522 DOI: 10.1016/j.molp.2023.11.011] [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: 09/20/2023] [Revised: 11/09/2023] [Accepted: 11/28/2023] [Indexed: 12/03/2023]
Abstract
The regulation of stomatal aperture opening and closure represents an evolutionary battle between plants and pathogens, characterized by adaptive strategies that influence both plant resistance and pathogen virulence. The ongoing climate change introduces further complexity, affecting pathogen invasion and host immunity. This review delves into recent advances on our understanding of the mechanisms governing immunity-related stomatal movement and patterning with an emphasis on the regulation of stomatal opening and closure dynamics by pathogen patterns and host phytocytokines. In addition, the review explores how climate changes impact plant-pathogen interactions by modulating stomatal behavior. In light of the pressing challenges associated with food security and the unpredictable nature of climate changes, future research in this field, which includes the investigation of spatiotemporal regulation and engineering of stomatal immunity, emerges as a promising avenue for enhancing crop resilience and contributing to climate control strategies.
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Affiliation(s)
- Shuguo Hou
- Peking University Institute of Advanced Agricultural Sciences, Shandong Laboratory of Advanced Agriculture Sciences in Weifang, Weifang, Shandong 261325, China; School of Municipal & Environmental Engineering, Shandong Jianzhu University, Jinan, Shandong 250101, China.
| | - Olivier Rodrigues
- Unité de Recherche Physiologie, Pathologie et Génétique Végétales, Université de Toulouse Midi-Pyrénées, INP-PURPAN, 31076 Toulouse, France
| | - Zunyong Liu
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Libo Shan
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Ping He
- Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI 48109, USA.
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2
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Pastor-Fernández J, Sánchez-Bel P, Flors V, Cerezo M, Pastor V. Small Signals Lead to Big Changes: The Potential of Peptide-Induced Resistance in Plants. J Fungi (Basel) 2023; 9:265. [PMID: 36836379 PMCID: PMC9965805 DOI: 10.3390/jof9020265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Revised: 02/05/2023] [Accepted: 02/13/2023] [Indexed: 02/18/2023] Open
Abstract
The plant immunity system is being revisited more and more and new elements and roles are attributed to participating in the response to biotic stress. The new terminology is also applied in an attempt to identify different players in the whole scenario of immunity: Phytocytokines are one of those elements that are gaining more attention due to the characteristics of processing and perception, showing they are part of a big family of compounds that can amplify the immune response. This review aims to highlight the latest findings on the role of phytocytokines in the whole immune response to biotic stress, including basal and adaptive immunity, and expose the complexity of their action in plant perception and signaling events.
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Affiliation(s)
- Julia Pastor-Fernández
- Department of Biology, Biochemistry and Natural Sciences, School of Technology and Experimental Sciences, Universitat Jaume I, 12006 Castelló de la Plana, Spain
- Department of Plant Molecular Genetics, National Centre for Biotechnology, Consejo Superior de Investigaciones Científicas (CNB-CSIC), 28049 Madrid, Spain
| | - Paloma Sánchez-Bel
- Department of Biology, Biochemistry and Natural Sciences, School of Technology and Experimental Sciences, Universitat Jaume I, 12006 Castelló de la Plana, Spain
| | - Víctor Flors
- Department of Biology, Biochemistry and Natural Sciences, School of Technology and Experimental Sciences, Universitat Jaume I, 12006 Castelló de la Plana, Spain
| | - Miguel Cerezo
- Department of Biology, Biochemistry and Natural Sciences, School of Technology and Experimental Sciences, Universitat Jaume I, 12006 Castelló de la Plana, Spain
| | - Victoria Pastor
- Department of Biology, Biochemistry and Natural Sciences, School of Technology and Experimental Sciences, Universitat Jaume I, 12006 Castelló de la Plana, Spain
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3
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Sun W, Yuan M, Yin L, Ke X, Zuo Y. A natriuretic peptide molecule from Vigna angularis, VaEG45, confers rust resistance by inhibiting fungal development. PLANT CELL REPORTS 2023; 42:409-420. [PMID: 36576553 DOI: 10.1007/s00299-022-02967-7] [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: 09/24/2022] [Accepted: 12/15/2022] [Indexed: 06/17/2023]
Abstract
Novel function and mechanism of a PNP molecule VaEG45 from adzuki bean involved in plant immunity. Plant natriuretic peptides (PNPs) can affect a broad spectrum of physiological responses in plants acting as peptidic signaling molecules. However, PNPs may play additional roles in plant immunity. Our previous transcriptome data of adzuki bean (Vigna angularis) in response to Uromyces vignae infection revealed association of PNP-encoding gene VaEG45 with U. vignae resistance. To determine the function of VaEG45 in disease resistance, we cloned the 589 bp nucleotide sequence of VaEG45 containing 2 introns, encoding a putative 13.68 kDa protein that is 131 amino acids in length. We analyzed expression in different resistant cultivars of V. angularis and found significant induction of VaEG45 expression after U. vignae infection. Transient expression of VaEG45 improved tobacco resistance against Botrytis cinerea. We next analyzed the mechanism by which VaEG45 protects plants from fungal infection by determination of the biological activity of the prokaryotic expressed VaEG45. The results showed that the fusion protein VaEG45 can significantly inhibit urediospores germination of U. vignae, mycelial growth, and the infection of tobacco by B. cinerea. Further analysis revealed that VaEG45 exhibits β-1, 3-glucanase activity. These findings uncover the function of a novel PNP molecule VaEG45 and provide new evidence about the mechanism of PNPs in plant immunity.
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Affiliation(s)
- Weina Sun
- Heilongjiang Provincial Key Laboratory of Crop-Pest Interaction Biology and Ecological Control, National Coarse Cereals Engineering Research Center, Key Laboratory of Low-Carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs P. R. China, Heilongjiang Bayi Agricultural University, Daqing, 163319, China
| | - Mengqi Yuan
- Heilongjiang Provincial Key Laboratory of Crop-Pest Interaction Biology and Ecological Control, National Coarse Cereals Engineering Research Center, Key Laboratory of Low-Carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs P. R. China, Heilongjiang Bayi Agricultural University, Daqing, 163319, China
| | - Lihua Yin
- Heilongjiang Provincial Key Laboratory of Crop-Pest Interaction Biology and Ecological Control, National Coarse Cereals Engineering Research Center, Key Laboratory of Low-Carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs P. R. China, Heilongjiang Bayi Agricultural University, Daqing, 163319, China
| | - Xiwang Ke
- Heilongjiang Provincial Key Laboratory of Crop-Pest Interaction Biology and Ecological Control, National Coarse Cereals Engineering Research Center, Key Laboratory of Low-Carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs P. R. China, Heilongjiang Bayi Agricultural University, Daqing, 163319, China.
| | - Yuhu Zuo
- Heilongjiang Provincial Key Laboratory of Crop-Pest Interaction Biology and Ecological Control, National Coarse Cereals Engineering Research Center, Key Laboratory of Low-Carbon Green Agriculture in Northeastern China, Ministry of Agriculture and Rural Affairs P. R. China, Heilongjiang Bayi Agricultural University, Daqing, 163319, China.
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Di Paolo V, Masotti F, Vranych CV, Grandellis C, Garavaglia BS, Gottig N, Ottado J. Xanthomonas natriuretic peptide is recognized by the Arabidopsis natriuretic peptide receptor 1 and through this interaction triggers similar plant responses to its plant counterpart. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2023; 326:111494. [PMID: 36240911 DOI: 10.1016/j.plantsci.2022.111494] [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: 06/14/2022] [Revised: 10/04/2022] [Accepted: 10/08/2022] [Indexed: 06/16/2023]
Abstract
Plant natriuretic peptides (PNPs) are hormone peptides that participate in the regulation of ions and water homeostasis in plants. Xanthomonas citri subsp. citri (Xcc) the causal agent of citrus canker disease also possesses a PNP-like peptide (XacPNP). This peptide, similarly to AtPNP-A, the most studied PNP from Arabidopsis thaliana, causes stomatal aperture and enhances photosynthetic efficiency in plant leaves. Thus, the function that has been attributed to XacPNP is to contribute to maintain photosynthetic efficiency and water homeostasis in plant tissue during the infection process, to create favorable conditions for biotrophic pathogens survival. A PNP receptor (AtPNP-R1) for AtPNP-A has been identified and the AtPNP-A activity in regulation of water homeostasis has been observed to depend on the presence of AtPNP-R1. Here, we demonstrated that both AtPNP-A and XacPNP require the presence of AtPNP-R1 to induce plant stomatal aperture. Also, less necrotic tissue was found in infections with pathogens expressing XacPNP and this was dependent on the presence of AtPNP-R1, suggesting that XacPNP interacts with this receptor to exert its function. Finally, we confirmed that AtPNP-A and XacPNP interact with AtPNP-R1 in planta, which support the idea that XacPNP triggers similar plant responses to its plant counterpart.
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Affiliation(s)
- Valeria Di Paolo
- Instituto de Biología Molecular y Celular de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IBR-CONICET) and Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Ocampo y Esmeralda, Rosario 2000, Argentina
| | - Fiorella Masotti
- Instituto de Biología Molecular y Celular de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IBR-CONICET) and Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Ocampo y Esmeralda, Rosario 2000, Argentina
| | - Cecilia V Vranych
- Instituto de Biología Molecular y Celular de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IBR-CONICET) and Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Ocampo y Esmeralda, Rosario 2000, Argentina
| | - Carolina Grandellis
- Instituto de Biología Molecular y Celular de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IBR-CONICET) and Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Ocampo y Esmeralda, Rosario 2000, Argentina
| | - Betiana S Garavaglia
- Instituto de Biología Molecular y Celular de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IBR-CONICET) and Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Ocampo y Esmeralda, Rosario 2000, Argentina
| | - Natalia Gottig
- Instituto de Biología Molecular y Celular de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IBR-CONICET) and Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Ocampo y Esmeralda, Rosario 2000, Argentina
| | - Jorgelina Ottado
- Instituto de Biología Molecular y Celular de Rosario, Consejo Nacional de Investigaciones Científicas y Técnicas (IBR-CONICET) and Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario (UNR), Ocampo y Esmeralda, Rosario 2000, Argentina.
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5
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Ho BL, Chen JC, Huang TP, Fang SC. Protocorm-like-body extract of Phalaenopsis aphrodite combats watermelon fruit blotch disease. FRONTIERS IN PLANT SCIENCE 2022; 13:1054586. [PMID: 36523623 PMCID: PMC9745142 DOI: 10.3389/fpls.2022.1054586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 11/10/2022] [Indexed: 06/17/2023]
Abstract
Bacterial fruit blotch, caused by the seedborne gram-negative bacterium Acidovorax citrulli, is one of the most destructive bacterial diseases of cucurbits (gourds) worldwide. Despite its prevalence, effective and reliable means to control bacterial fruit blotch remain limited. Transcriptomic analyses of tissue culture-based regeneration processes have revealed that organogenesis-associated cellular reprogramming is often associated with upregulation of stress- and defense-responsive genes. Yet, there is limited evidence supporting the notion that the reprogrammed cellular metabolism of the regenerated tissued confers bona fide antimicrobial activity. Here, we explored the anti-bacterial activity of protocorm-like-bodies (PLBs) of Phalaenopsis aphrodite. Encouragingly, we found that the PLB extract was potent in slowing growth of A. citrulli, reducing the number of bacteria attached to watermelon seeds, and alleviating disease symptoms of watermelon seedlings caused by A. citrulli. Because the anti-bacterial activity can be fractionated chemically, we predict that reprogrammed cellular activity during the PLB regeneration process produces metabolites with antibacterial activity. In conclusion, our data demonstrated the antibacterial activity in developing PLBs and revealed the potential of using orchid PLBs to discover chemicals to control bacterial fruit blotch disease.
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Affiliation(s)
- Bo-Lin Ho
- Biotechnology Center in Southern Taiwan, Academia Sinica, Tainan, Taiwan
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
| | - Jhun-Chen Chen
- Biotechnology Center in Southern Taiwan, Academia Sinica, Tainan, Taiwan
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
| | - Tzu-Pi Huang
- Department of Plant Pathology, National Chung Hsing University, Taichung, Taiwan
- Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung, Taiwan
- Master’s and PhD Degree Program of Plant Health Care, Academy of Circular Economy, National Chung Hsing University, Nantou, Taiwan
| | - Su-Chiung Fang
- Biotechnology Center in Southern Taiwan, Academia Sinica, Tainan, Taiwan
- Agricultural Biotechnology Research Center, Academia Sinica, Taipei, Taiwan
- Biotechnology Center, National Chung Hsing University, Taichung, Taiwan
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Lv S, Yang Y, Yu G, Peng L, Zheng S, Singh SK, Vílchez JI, Kaushal R, Zi H, Yi D, Wang Y, Luo S, Wu X, Zuo Z, Huang W, Liu R, Du J, Macho AP, Tang K, Zhang H. Dysfunction of histone demethylase IBM1 in Arabidopsis causes autoimmunity and reshapes the root microbiome. THE ISME JOURNAL 2022; 16:2513-2524. [PMID: 35908110 PMCID: PMC9561531 DOI: 10.1038/s41396-022-01297-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Revised: 07/09/2022] [Accepted: 07/13/2022] [Indexed: 11/25/2022]
Abstract
Root microbiota is important for plant growth and fitness. Little is known about whether and how the assembly of root microbiota may be controlled by epigenetic regulation, which is crucial for gene transcription and genome stability. Here we show that dysfunction of the histone demethylase IBM1 (INCREASE IN BONSAI METHYLATION 1) in Arabidopsis thaliana substantially reshaped the root microbiota, with the majority of the significant amplicon sequence variants (ASVs) being decreased. Transcriptome analyses of plants grown in soil and in sterile growth medium jointly disclosed salicylic acid (SA)-mediated autoimmunity and production of the defense metabolite camalexin in the ibm1 mutants. Analyses of genome-wide histone modifications and DNA methylation highlighted epigenetic modifications permissive for transcription at several important defense regulators. Consistently, ibm1 mutants showed increased resistance to the pathogen Pseudomonas syringae DC3000 with stronger immune responses. In addition, ibm1 showed substantially impaired plant growth promotion in response to beneficial bacteria; the impairment was partially mimicked by exogenous application of SA to wild-type plants, and by a null mutation of AGP19 that is important for cell expansion and that is repressed with DNA hypermethylation in ibm1. IBM1-dependent epigenetic regulation imposes strong and broad impacts on plant-microbe interactions and thereby shapes the assembly of root microbiota.
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Liu C, Sun L, Sun Y, You X, Wan Y, Wu X, Tan M, Wu Q, Bai X, Ye X, Peng L, Zhao G, Xiang D, Zou L. Integrating transcriptome and physiological analyses to elucidate the molecular responses of buckwheat to graphene oxide. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127443. [PMID: 34653867 DOI: 10.1016/j.jhazmat.2021.127443] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2021] [Revised: 09/20/2021] [Accepted: 10/04/2021] [Indexed: 06/13/2023]
Abstract
With the increasing application of nanomaterials, evaluation of the phytotoxicity of nanoparticles has attracted considerable interest. Buckwheat is an economically pseudocereal crop, which is a potential model for investigating the response of plants to hazardous materials. In this study, the response of buckwheat to graphene oxide (GO) was investigated by integrating physiological and transcriptome analysis. GO can penetrate into buckwheat root and stem, and high concentrations of GO inhibited seedlings growth. High concentration of GO improved ROS production and regulated the activities and gene expression of oxidative enzymes, which implying GO may affect plant growth via regulating ROS detoxification. Root and stem exhibit distinct transcriptomic responses to GO, and the GO-responsive genes in stem are more enriched in cell cycle and epigenetic regulation. GO inhibited plant hormone biosynthesis and signaling by analyzing the expression data. Additionally, 97 small secreted peptides (SSPs) encoding genes were found to be involved in GO response. The gene expression of 111 transcription factor (TFs) and 43 receptor-like protein kinases (RLKs) were regulated by GO, and their expression showed high correlation with SSPs. Finally, the TFs-SSPs-RLKs signaling networks in regulating GO response were proposed. This study provides insights into the molecular responses of plants to GO.
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Affiliation(s)
- Changying Liu
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China.
| | - Lu Sun
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China
| | - Yanxia Sun
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China
| | - Xiaoqing You
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China
| | - Yan Wan
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China
| | - Xiaoyong Wu
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China
| | - Maoling Tan
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China
| | - Qi Wu
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China
| | - Xue Bai
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China
| | - Xueling Ye
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China
| | - Lianxin Peng
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China
| | - Gang Zhao
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China
| | - Dabing Xiang
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China.
| | - Liang Zou
- Key Laboratory of Coarse Cereal Processing, Ministry of Agriculture and Rural Affairs, Sichuan Engineering & Technology Research Center of Coarse Cereal Industralization, School of Food and Biological Engineering, Chengdu University, Chengdu 610106, Sichuan, PR China.
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Kumimoto RW, Ellison CT, Toruño TY, Bak A, Zhang H, Casteel CL, Coaker G, Harmer SL. XAP5 CIRCADIAN TIMEKEEPER Affects Both DNA Damage Responses and Immune Signaling in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2021; 12:707923. [PMID: 34659282 PMCID: PMC8517334 DOI: 10.3389/fpls.2021.707923] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 08/30/2021] [Indexed: 06/02/2023]
Abstract
Numerous links have been reported between immune response and DNA damage repair pathways in both plants and animals but the precise nature of the relationship between these fundamental processes is not entirely clear. Here, we report that XAP5 CIRCADIAN TIMEKEEPER (XCT), a protein highly conserved across eukaryotes, acts as a negative regulator of immunity in Arabidopsis thaliana and plays a positive role in responses to DNA damaging radiation. We find xct mutants have enhanced resistance to infection by a virulent bacterial pathogen, Pseudomonas syringae pv. tomato DC3000, and are hyper-responsive to the defense-activating hormone salicylic acid (SA) when compared to wild-type. Unlike most mutants with constitutive effector-triggered immunity (ETI), xct plants do not have increased levels of SA and retain enhanced immunity at elevated temperatures. Genetic analysis indicates XCT acts independently of NONEXPRESSOR OF PATHOGENESIS RELATED GENES1 (NPR1), which encodes a known SA receptor. Since DNA damage has been reported to potentiate immune responses, we next investigated the DNA damage response in our mutants. We found xct seedlings to be hypersensitive to UV-C and γ radiation and deficient in phosphorylation of the histone variant H2A.X, one of the earliest known responses to DNA damage. These data demonstrate that loss of XCT causes a defect in an early step of the DNA damage response pathway. Together, our data suggest that alterations in DNA damage response pathways may underlie the enhanced immunity seen in xct mutants.
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Affiliation(s)
- Roderick W. Kumimoto
- Department of Plant Biology, University of California, Davis, Davis, CA, United States
| | - Cory T. Ellison
- Department of Plant Biology, University of California, Davis, Davis, CA, United States
| | - Tania Y. Toruño
- Department of Plant Pathology, University of California, Davis, Davis, CA, United States
| | - Aurélie Bak
- Department of Plant Pathology, University of California, Davis, Davis, CA, United States
| | - Hongtao Zhang
- Department of Plant Biology, University of California, Davis, Davis, CA, United States
| | - Clare L. Casteel
- Department of Plant Pathology, University of California, Davis, Davis, CA, United States
- Department of Plant Pathology and Plant-Microbe Biology, Cornell University, Ithaca, NY, United States
| | - Gitta Coaker
- Department of Plant Pathology, University of California, Davis, Davis, CA, United States
| | - Stacey L. Harmer
- Department of Plant Biology, University of California, Davis, Davis, CA, United States
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The Same against Many: AtCML8, a Ca 2+ Sensor Acting as a Positive Regulator of Defense Responses against Several Plant Pathogens. Int J Mol Sci 2021; 22:ijms221910469. [PMID: 34638807 PMCID: PMC8508799 DOI: 10.3390/ijms221910469] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 09/21/2021] [Accepted: 09/24/2021] [Indexed: 01/11/2023] Open
Abstract
Calcium signals are crucial for the activation and coordination of signaling cascades leading to the establishment of plant defense mechanisms. Here, we studied the contribution of CML8, an Arabidopsis calmodulin-like protein in response to Ralstonia solanacearum and to pathogens with different lifestyles, such as Xanthomonas campestris pv. campestris and Phytophtora capsici. We used pathogenic infection assays, gene expression, RNA-seq approaches, and comparative analysis of public data on CML8 knockdown and overexpressing Arabidopsis lines to demonstrate that CML8 contributes to defense mechanisms against pathogenic bacteria and oomycetes. CML8 gene expression is finely regulated at the root level and manipulated during infection with Ralstonia, and CML8 overexpression confers better plant tolerance. To understand the processes controlled by CML8, genes differentially expressed at the root level in the first hours of infection have been identified. Overexpression of CML8 also confers better tolerance against Xanthomonas and Phytophtora, and most of the genes differentially expressed in response to Ralstonia are differentially expressed in these different pathosystems. Collectively, CML8 acts as a positive regulator against Ralstonia solanaceraum and against other vascular or root pathogens, suggesting that CML8 is a multifunctional protein that regulates common downstream processes involved in the defense response of plants to several pathogens.
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Turek I, Gehring C, Irving H. Arabidopsis Plant Natriuretic Peptide Is a Novel Interactor of Rubisco Activase. Life (Basel) 2020; 11:life11010021. [PMID: 33396438 PMCID: PMC7823470 DOI: 10.3390/life11010021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 12/22/2020] [Accepted: 12/29/2020] [Indexed: 11/16/2022] Open
Abstract
Plant natriuretic peptides (PNPs) are a group of systemically acting peptidic hormones affecting solute and solvent homeostasis and responses to biotrophic pathogens. Although an increasing body of evidence suggests PNPs modulate plant responses to biotic and abiotic stress, which could lead to their potential biotechnological application by conferring increased stress tolerance to plants, the exact mode of PNPs action is still elusive. In order to gain insight into PNP-dependent signalling, we set out to identify interactors of PNP present in the model plant Arabidopsis thaliana, termed AtPNP-A. Here, we report identification of rubisco activase (RCA), a central regulator of photosynthesis converting Rubisco catalytic sites from a closed to an open conformation, as an interactor of AtPNP-A through affinity isolation followed by mass spectrometric identification. Surface plasmon resonance (SPR) analyses reveals that the full-length recombinant AtPNP-A and the biologically active fragment of AtPNP-A bind specifically to RCA, whereas a biologically inactive scrambled peptide fails to bind. These results are considered in the light of known functions of PNPs, PNP-like proteins, and RCA in biotic and abiotic stress responses.
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Affiliation(s)
- Ilona Turek
- Biomolecular Laboratory, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, VIC 3552, Australia
| | - Chris Gehring
- Biomolecular Laboratory, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia
- Department of Chemistry, Biology and Biotechnology, University of Perugia, 06121 Perugia, Italy
| | - Helen Irving
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, VIC 3552, Australia
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A natriuretic peptide from Arabidopsis thaliana (AtPNP-A) can modulate catalase 2 activity. Sci Rep 2020; 10:19632. [PMID: 33184368 PMCID: PMC7665192 DOI: 10.1038/s41598-020-76676-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 11/02/2020] [Indexed: 12/15/2022] Open
Abstract
Analogues of vertebrate natriuretic peptides (NPs) present in plants, termed plant natriuretic peptides (PNPs), comprise a novel class of hormones that systemically affect salt and water balance and responses to plant pathogens. Several lines of evidence indicate that Arabidopsis thaliana PNP (AtPNP-A) affects cellular redox homeostasis, which is also typical for the signaling of its vertebrate analogues, but the molecular mechanism(s) of this effect remains elusive. Here we report identification of catalase 2 (CAT2), an antioxidant enzyme, as an interactor of AtPNP-A. The full-length AtPNP-A recombinant protein and the biologically active fragment of AtPNP-A bind specifically to CAT2 in surface plasmon resonance (SPR) analyses, while a biologically inactive scrambled peptide does not. In vivo bimolecular fluorescence complementation (BiFC) showed that CAT2 interacts with AtPNP-A in chloroplasts. Furthermore, CAT2 activity is lower in homozygous atpnp-a knockdown compared with wild type plants, and atpnp-a knockdown plants phenocopy CAT2-deficient plants in their sensitivity to elevated H2O2, which is consistent with a direct modulatory effect of the PNP on the activity of CAT2 and hence H2O2 homeostasis. Our work underlines the critical role of AtPNP-A in modulating the activity of CAT2 and highlights a mechanism of fine-tuning plant responses to adverse conditions by PNPs.
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12
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Snelders NC, Rovenich H, Petti GC, Rocafort M, van den Berg GCM, Vorholt JA, Mesters JR, Seidl MF, Nijland R, Thomma BPHJ. Microbiome manipulation by a soil-borne fungal plant pathogen using effector proteins. NATURE PLANTS 2020; 6:1365-1374. [PMID: 33139860 DOI: 10.1038/s41477-020-00799-5] [Citation(s) in RCA: 89] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Accepted: 09/29/2020] [Indexed: 05/23/2023]
Abstract
During colonization of their hosts, pathogens secrete effector proteins to promote disease development through various mechanisms. Increasing evidence shows that the host microbiome plays a crucial role in health, and that hosts actively shape their microbiomes to suppress disease. We proposed that pathogens evolved to manipulate host microbiomes to their advantage in turn. Here, we show that the previously identified virulence effector VdAve1, secreted by the fungal plant pathogen Verticillium dahliae, displays antimicrobial activity and facilitates colonization of tomato and cotton through the manipulation of their microbiomes by suppressing antagonistic bacteria. Moreover, we show that VdAve1, and also the newly identified antimicrobial effector VdAMP2, are exploited for microbiome manipulation in the soil environment, where the fungus resides in absence of a host. In conclusion, we demonstrate that a fungal plant pathogen uses effector proteins to modulate microbiome compositions inside and outside the host, and propose that pathogen effector catalogues represent an untapped resource for new antibiotics.
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Affiliation(s)
- Nick C Snelders
- Laboratory of Phytopathology, Wageningen University and Research, Wageningen, the Netherlands
| | - Hanna Rovenich
- Laboratory of Phytopathology, Wageningen University and Research, Wageningen, the Netherlands
| | - Gabriella C Petti
- Laboratory of Phytopathology, Wageningen University and Research, Wageningen, the Netherlands
- Institute of Microbiology, ETH Zürich, Zürich, Switzerland
| | - Mercedes Rocafort
- Laboratory of Phytopathology, Wageningen University and Research, Wageningen, the Netherlands
- School of Agriculture and Environment, Massey University, Palmerston North, New Zealand
| | - Grardy C M van den Berg
- Laboratory of Phytopathology, Wageningen University and Research, Wageningen, the Netherlands
| | | | - Jeroen R Mesters
- Institute of Biochemistry, University of Lübeck, Center for Structural and Cell Biology in Medicine, Lübeck, Germany
| | - Michael F Seidl
- Laboratory of Phytopathology, Wageningen University and Research, Wageningen, the Netherlands
- Theoretical Biology & Bioinformatics Group, Department of Biology, Utrecht University, Utrecht, the Netherlands
| | - Reindert Nijland
- Laboratory of Phytopathology, Wageningen University and Research, Wageningen, the Netherlands
- Marine Animal Ecology Group, Wageningen University and Research, Wageningen, the Netherlands
| | - Bart P H J Thomma
- Laboratory of Phytopathology, Wageningen University and Research, Wageningen, the Netherlands.
- Cluster of Excellence on Plant Sciences (CEPLAS), University of Cologne, Botanical Institute, Cologne, Germany.
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13
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RNA-sequencing based gene expression landscape of guava cv. Allahabad Safeda and comparative analysis to colored cultivars. BMC Genomics 2020; 21:484. [PMID: 32669108 PMCID: PMC7364479 DOI: 10.1186/s12864-020-06883-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Accepted: 07/06/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Guava (Psidium guajava L.) is an important fruit crop of tropical and subtropical areas of the world. Genomics resources in guava are scanty. RNA-Seq based tissue specific expressed genomic information, de novo transcriptome assembly, functional annotation and differential expression among contrasting genotypes has a potential to set the stage for the functional genomics for traits of commerce like colored flesh and apple color peel. RESULTS Development of fruit from flower involves orchestration of myriad molecular switches. We did comparative transcriptome sequencing on leaf, flower and fruit tissues of cv. Allahabad Safeda to understand important genes and pathways controlling fruit development. Tissue specific RNA sequencing and de novo transcriptome assembly using Trinity pipeline provided us the first reference transcriptome for guava consisting of 84,206 genes comprising 279,792 total transcripts with a N50 of 3603 bp. Blast2GO assigned annotation to 116,629 transcripts and PFam based HMM profile annotated 140,061 transcripts with protein domains. Differential expression with EdgeR identified 3033 genes in Allahabad Safeda tissues. Mapping the differentially expressed transcripts over molecular pathways indicate significant Ethylene and Abscisic acid hormonal changes and secondary metabolites, carbohydrate metabolism and fruit softening related gene transcripts during fruit development, maturation and ripening. Differential expression analysis among colored tissue comparisons in 3 cultivars Allahabad Safeda, Punjab Pink and Apple Color identified 68 candidate genes that might be controlling color development in guava fruit. Comparisons of red vs green peel in Apple Color, white pulp vs red pulp in Punjab Pink and fruit maturation vs ripening in non-colored Allahabad Safeda indicates up-regulation of ethylene biosynthesis accompanied to secondary metabolism like phenylpropanoid and monolignol pathways. CONCLUSIONS Benchmarking Universal Single-Copy Orthologs analysis of de novo transcriptome of guava with eudicots identified 93.7% complete BUSCO genes. In silico differential gene expression among tissue types of Allahabad Safeda and validation of candidate genes with qRT-PCR in contrasting color genotypes promises the utility of this first guava transcriptome for its potential of tapping the genetic elements from germplasm collections for enhancing fruit traits.
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14
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Lee KP, Liu K, Kim EY, Medina-Puche L, Dong H, Duan J, Li M, Dogra V, Li Y, Lv R, Li Z, Lozano-Duran R, Kim C. PLANT NATRIURETIC PEPTIDE A and Its Putative Receptor PNP-R2 Antagonize Salicylic Acid-Mediated Signaling and Cell Death. THE PLANT CELL 2020; 32:2237-2250. [PMID: 32409317 PMCID: PMC7346577 DOI: 10.1105/tpc.20.00018] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 03/31/2020] [Accepted: 05/13/2020] [Indexed: 05/07/2023]
Abstract
The plant stress hormone salicylic acid (SA) participates in local and systemic acquired resistance, which eventually leads to whole-plant resistance to bacterial pathogens. However, if SA-mediated signaling is not appropriately controlled, plants incur defense-associated fitness costs such as growth inhibition and cell death. Despite its importance, to date only a few components counteracting the SA-primed stress responses have been identified in Arabidopsis (Arabidopsis thaliana). These include other plant hormones such as jasmonic acid and abscisic acid, and proteins such as LESION SIMULATING DISEASE1, a transcription coregulator. Here, we describe PLANT NATRIURETIC PEPTIDE A (PNP-A), a functional analog to vertebrate atrial natriuretic peptides, that appears to antagonize the SA-mediated plant stress responses. While loss of PNP-A potentiates SA-mediated signaling, exogenous application of synthetic PNP-A or overexpression of PNP-A significantly compromises the SA-primed immune responses. Moreover, we identify a plasma membrane-localized receptor-like protein, PNP-R2, that interacts with PNP-A and is required to initiate the PNP-A-mediated intracellular signaling. In summary, our work identifies a peptide and its putative cognate receptor as counteracting both SA-mediated signaling and SA-primed cell death in Arabidopsis.
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Affiliation(s)
- Keun Pyo Lee
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Kaiwei Liu
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Eun Yu Kim
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai 200032, China
| | - Laura Medina-Puche
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Haihong Dong
- Shanghai Key Laboratory of Plant Functional Genomics and Resources, Shanghai Chenshan Plant Science Research Center, Chinese Academy of Sciences, Shanghai Chenshan Botanical Garden, Shanghai 201602, China
- College of Life Sciences, Shanghai Normal University, Shanghai 200234, China
| | - Jianli Duan
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Mengping Li
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Vivek Dogra
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Yingrui Li
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Ruiqing Lv
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Zihao Li
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
- University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Rosa Lozano-Duran
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Chanhong Kim
- Shanghai Center for Plant Stress Biology and Center of Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China
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15
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Liu X, Guan H, Wang T, Meng D, Yang Y, Dai J, Fan N, Guo B, Fu Y, He W, Wei Y. ScPNP-A, a plant natriuretic peptide from Stellera chamaejasme, confers multiple stress tolerances in Arabidopsis. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2020; 149:132-143. [PMID: 32062590 DOI: 10.1016/j.plaphy.2020.02.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 02/06/2020] [Accepted: 02/06/2020] [Indexed: 06/10/2023]
Abstract
As a class of peptide hormone, plant natriuretic peptides (PNPs) play an important role in maintaining water and salt balance in plants, as well as in the physiological processes of biotic stress and pathogen resistance. However, in plants, except for some PNPs, such as the Arabidopsis thaliana PNP-A (AtPNP-A), of which the function has not yet been thoroughly revealed, few PNPs in other plants have been reported. In this study, a PNP-A (ScPNP-A) has been identified and characterized in Stellera chamaejasme for the first time. ScPNP-A is a double-psi beta-barrel (DPBB) fold containing protein and is localized in the extracellular (secreted) space. In S. chamaejasme, the expression of ScPNP-A was significantly up-regulated by salt, drought and cold stress. Changes at the physiological and biochemical levels and the expression of resistance-related genes indicated that overexpression of ScPNP-A can significantly improve salt, drought and freezing tolerance in Arabidopsis. ScPNP-A could stimulate the opening, not the closing of stomata, and its expression was not enhanced by external application of ABA. Furthermore, overexpression of ScPNP-A resulted in the elevated expression of genes in the ABA biosynthesis and reception pathway. These suggested that there may be some cross-talk between ScPNP-A and the ABA-dependent signaling pathways to regulate water related stress, however further experimentation is required to understand this relationship. In addition, overexpression of ScPNP-A can enhance the resistance to pathogens by enhancing SAR in Arabidopsis. These results indicate that ScPNP-A could function as a positive regulator in plant response to biotic stress and abiotic stress.
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Affiliation(s)
- Xin Liu
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, No. 229, North Taibai Road, Xi'an, 710069, Shaanxi, China.
| | - Huirui Guan
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, No. 229, North Taibai Road, Xi'an, 710069, Shaanxi, China.
| | - Tianshu Wang
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, No. 229, North Taibai Road, Xi'an, 710069, Shaanxi, China.
| | - Dian Meng
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, No. 229, North Taibai Road, Xi'an, 710069, Shaanxi, China.
| | - Youfeng Yang
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, No. 229, North Taibai Road, Xi'an, 710069, Shaanxi, China.
| | - Jiakun Dai
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, No. 229, North Taibai Road, Xi'an, 710069, Shaanxi, China; Bio-Agriculture Institute of Shaanxi, Chinese Academy of Science, No. 125, Xianning Middle Road, Xi'an, 710043, Shaanxi, China.
| | - Na Fan
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, No. 229, North Taibai Road, Xi'an, 710069, Shaanxi, China; College of Healthy Management, Shangluo University, Shangluo, 726000, Shaanxi, China.
| | - Bin Guo
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, No. 229, North Taibai Road, Xi'an, 710069, Shaanxi, China.
| | - Yanping Fu
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, No. 229, North Taibai Road, Xi'an, 710069, Shaanxi, China.
| | - Wei He
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, No. 229, North Taibai Road, Xi'an, 710069, Shaanxi, China.
| | - Yahui Wei
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education & College of Life Sciences, Northwest University, No. 229, North Taibai Road, Xi'an, 710069, Shaanxi, China.
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16
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HrpE, the major component of the Xanthomonas type three protein secretion pilus, elicits plant immunity responses. Sci Rep 2018; 8:9842. [PMID: 29959345 PMCID: PMC6026121 DOI: 10.1038/s41598-018-27869-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Accepted: 06/11/2018] [Indexed: 02/06/2023] Open
Abstract
Like several pathogenic bacteria, Xanthomonas infect host plants through the secretion of effector proteins by the Hrp pilus of the Type Three Protein Secretion System (T3SS). HrpE protein was identified as the major structural component of this pilus. Here, using the Xanthomonas citri subsp. citri (Xcc) HrpE as a model, a novel role for this protein as an elicitor of plant defense responses was found. HrpE triggers defense responses in host and non-host plants revealed by the development of plant lesions, callose deposition, hydrogen peroxide production and increase in the expression levels of genes related to plant defense responses. Moreover, pre-infiltration of citrus or tomato leaves with HrpE impairs later Xanthomonas infections. Particularly, HrpE C-terminal region, conserved among Xanthomonas species, was sufficient to elicit these responses. HrpE was able to interact with plant Glycine-Rich Proteins from citrus (CsGRP) and Arabidopsis (AtGRP-3). Moreover, an Arabidopsis atgrp-3 knockout mutant lost the capacity to respond to HrpE. This work demonstrate that plants can recognize the conserved C-terminal region of the T3SS pilus HrpE protein as a danger signal to defend themselves against Xanthomonas, triggering defense responses that may be mediated by GRPs.
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17
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Nguyen HM, Sako K, Matsui A, Ueda M, Tanaka M, Ito A, Nishino N, Yoshida M, Seki M. Transcriptomic analysis of Arabidopsis thaliana plants treated with the Ky-9 and Ky-72 histone deacetylase inhibitors. PLANT SIGNALING & BEHAVIOR 2018; 13:e1448333. [PMID: 29517946 PMCID: PMC5927655 DOI: 10.1080/15592324.2018.1448333] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 02/09/2018] [Accepted: 02/14/2018] [Indexed: 05/30/2023]
Abstract
Histone acetylation plays a pivotal role in plant growth and development, and is regulated by the antagonistic relationship between histone acetyltransferase (HAT) and histone deacetylase (HDAC). We previously revealed that some HDAC inhibitors confer high-salinity stress tolerance in plants. In this study, we identified two HDAC inhibitors, namely Ky-9 and Ky-72, which enhanced the high-salinity stress tolerance of Arabidopsis thaliana. Ky-9 and Ky-72 are structurally similar chlamydocin analogs. However, the in vitro inhibitory activity of Ky-9 against mammalian HDAC is greater than that of Ky-72. A western blot indicated that Ky-9 and Ky-72 increased the acetylation levels of histone H3, suggesting they exhibit HDAC inhibitory activities in plants. We conducted a transcriptomic analysis to investigate how Ky-9 and Ky-72 enhance high-salinity stress tolerance. Although Ky-9 upregulated the expression of more genes than Ky-72, similar gene expression patterns were induced by both HDAC inhibitors. Additionally, the expression of high-salinity stress tolerance-related genes, such as anthocyanin-related genes and a small peptide-encoding gene, increased by Ky-9 and Ky-72. These data suggest that slight structural differences in chemical side chain between HDAC inhibitors can alter inhibitory effect on HDAC protein leading to influence gene expression, thereby enhancing high-salinity stress tolerance in different extent.
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Affiliation(s)
- Huong Mai Nguyen
- Plant Genomic Network Research Team, RIKEN Center for Sustainable Resource Science 1-7-22, Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, Japan
- Kihara Institute for Biological Research, Yokohama City University, Yokohama, Japan
| | - Kaori Sako
- Plant Genomic Network Research Team, RIKEN Center for Sustainable Resource Science 1-7-22, Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, Japan
- CREST, JST, 4-1-8 Honcho, Kawaguchi, Saitama, Japan
| | - Akihiro Matsui
- Plant Genomic Network Research Team, RIKEN Center for Sustainable Resource Science 1-7-22, Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, Japan
| | - Minoru Ueda
- Plant Genomic Network Research Team, RIKEN Center for Sustainable Resource Science 1-7-22, Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, Japan
- CREST, JST, 4-1-8 Honcho, Kawaguchi, Saitama, Japan
| | - Maho Tanaka
- Plant Genomic Network Research Team, RIKEN Center for Sustainable Resource Science 1-7-22, Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, Japan
| | - Akihiro Ito
- Chemical Genomics Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama, Japan
- School of Life Sciences, Tokyo University of Pharmacy and Life Sciences 1432-1, Horinouchi, Hachioji, Tokyo, Japan
| | - Norikazu Nishino
- Chemical Genomics Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama, Japan
| | - Minoru Yoshida
- Chemical Genomics Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama, Japan
| | - Motoaki Seki
- Plant Genomic Network Research Team, RIKEN Center for Sustainable Resource Science 1-7-22, Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa, Japan
- Kihara Institute for Biological Research, Yokohama City University, Yokohama, Japan
- CREST, JST, 4-1-8 Honcho, Kawaguchi, Saitama, Japan
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