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Li W, Li P, Deng Y, Zhang Z, Situ J, Huang J, Li M, Xi P, Jiang Z, Kong G. Litchi aspartic protease LcAP1 enhances plant resistance via suppressing cell death triggered by the pectate lyase PlPeL8 from Peronophythora litchii. THE NEW PHYTOLOGIST 2024; 242:2682-2701. [PMID: 38622771 DOI: 10.1111/nph.19755] [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: 11/20/2023] [Accepted: 03/20/2024] [Indexed: 04/17/2024]
Abstract
Plant cell death is regulated in plant-pathogen interactions. While some aspartic proteases (APs) participate in regulating programmed cell death or defense responses, the defense functions of most APs remain largely unknown. Here, we report on a virulence factor, PlPeL8, which is a pectate lyase found in the hemibiotrophic pathogen Peronophythora litchii. Through in vivo and in vitro assays, we confirmed the interaction between PlPeL8 and LcAP1 from litchi, and identified LcAP1 as a positive regulator of plant immunity. PlPeL8 induced cell death associated with NbSOBIR1 and NbMEK2. The 11 conserved residues of PlPeL8 were essential for inducing cell death and enhancing plant susceptibility. Twenty-three LcAPs suppressed cell death induced by PlPeL8 in Nicotiana benthamiana depending on their interaction with PlPeL8. The N-terminus of LcAP1 was required for inhibiting PlPeL8-triggered cell death and susceptibility. Furthermore, PlPeL8 led to higher susceptibility in NbAPs-silenced N. benthamiana than the GUS-control. Our results indicate the crucial roles of LcAP1 and its homologs in enhancing plant resistance via suppression of cell death triggered by PlPeL8, and LcAP1 represents a promising target for engineering disease resistance. Our study provides new insights into the role of plant cell death in the arms race between plants and hemibiotrophic pathogens.
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Affiliation(s)
- Wen Li
- National Key Laboratory of Green Pesticide/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510642, China
| | - Peng Li
- National Key Laboratory of Green Pesticide/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510642, China
| | - Yizhen Deng
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources/Integrative Microbiology Research Center, South China Agricultural University, Guangzhou, 510642, China
| | - Zijing Zhang
- National Key Laboratory of Green Pesticide/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510642, China
| | - Junjian Situ
- National Key Laboratory of Green Pesticide/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510642, China
| | - Ji Huang
- National Key Laboratory of Green Pesticide/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510642, China
| | - Minhui Li
- National Key Laboratory of Green Pesticide/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510642, China
| | - Pinggen Xi
- National Key Laboratory of Green Pesticide/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510642, China
| | - Zide Jiang
- National Key Laboratory of Green Pesticide/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510642, China
| | - Guanghui Kong
- National Key Laboratory of Green Pesticide/Guangdong Province Key Laboratory of Microbial Signals and Disease Control, South China Agricultural University, Guangzhou, 510642, China
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Dong S, Wang L, Qin H, Zhan H, Wang D, Cao X. Expression Patterns and Functional Analysis of Three SmTAT Genes Encoding Tyrosine Aminotransferases in Salvia miltiorrhiza. Int J Mol Sci 2023; 24:15575. [PMID: 37958559 PMCID: PMC10649420 DOI: 10.3390/ijms242115575] [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: 09/06/2023] [Revised: 10/20/2023] [Accepted: 10/23/2023] [Indexed: 11/15/2023] Open
Abstract
Tyrosine aminotransferase (TAT, E.C. 2.6.1.5) is a pyridoxal phosphate-dependent aminotransferase that is widely found in living organisms. It catalyzes the transfer of the amino group on tyrosine to α-ketoglutarate to produce 4-hydroxyphenylpyruvic acid (4-HPP) and is the first enzyme for tyrosine degradation. Three SmTATs have been identified in the genome of Salvia miltiorrhiza (a model medicinal plant), but their information is very limited. Here, the expression profiles of the three SmTAT genes (SmTAT1, SmTAT2, and SmTAT3) were studied. All three genes expressed in different tissues and responded to methyl jasmonate stimuli. SmTAT proteins are localized in the cytoplasm. The recombinant SmTATs were subjected to in vitro biochemical properties. All three recombinant enzymes had TAT activities and SmTAT1 had the highest catalytic activity for tyrosine, followed by SmTAT3. Also, SmTAT1 preferred the direction of tyrosine deamination to 4-HPP, while SmTAT2 preferred transamination of 4-HPP to tyrosine. In parallel, transient overexpression of SmTATs in tobacco leaves revealed that all three SmTAT proteins catalyzed tyrosine to 4-HPP in vivo, with SmTAT1 exhibiting the highest enzymatic activity. Overall, our results lay a foundation for the production of tyrosine-derived secondary metabolites via metabolic engineering or synthetic biology in the future.
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Affiliation(s)
| | | | | | | | | | - Xiaoyan Cao
- Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry, College of Life Science, Shaanxi Normal University, Xi’an 710062, China; (S.D.); (L.W.); (H.Q.); (H.Z.); (D.W.)
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Rai P, Prasad L, Rai PK. Fungal effectors versus defense-related genes of B. juncea and the status of resistant transgenics against fungal pathogens. FRONTIERS IN PLANT SCIENCE 2023; 14:1139009. [PMID: 37360735 PMCID: PMC10285668 DOI: 10.3389/fpls.2023.1139009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Accepted: 05/09/2023] [Indexed: 06/28/2023]
Abstract
Oilseed brassica has become instrumental in securing global food and nutritional security. B. juncea, colloquially known as Indian mustard, is cultivated across tropics and subtropics including Indian subcontinent. The production of Indian mustard is severely hampered by fungal pathogens which necessitates human interventions. Chemicals are often resorted to as they are quick and effective, but due to their economic and ecological unsustainability, there is a need to explore their alternatives. The B. juncea-fungal pathosystem is quite diverse as it covers broad-host range necrotrophs (Sclerotinia sclerotiorum), narrow-host range necrotrophs (Alternaria brassicae and A. brassicicola) and biotrophic oomycetes (Albugo candida and Hyaloperonospora brassica). Plants ward off fungal pathogens through two-step resistance mechanism; PTI which involves recognition of elicitors and ETI where the resistance gene (R gene) interacts with the fungal effectors. The hormonal signalling is also found to play a vital role in defense as the JA/ET pathway is initiated at the time of necrotroph infection and SA pathway is induced when the biotrophs attack plants. The review discuss the prevalence of fungal pathogens of Indian mustard and the studies conducted on effectoromics. It covers both pathogenicity conferring genes and host-specific toxins (HSTs) that can be used for a variety of purposes such as identifying cognate R genes, understanding pathogenicity and virulence mechanisms, and establishing the phylogeny of fungal pathogens. It further encompasses the studies on identifying resistant sources and characterisation of R genes/quantitative trait loci and defense-related genes identified in Brassicaceae and unrelated species which, upon introgression or overexpression, confer resistance. Finally, the studies conducted on developing resistant transgenics in Brassicaceae have been covered in which chitinase and glucanase genes are mostly used. The knowledge gained from this review can further be used for imparting resistance against major fungal pathogens.
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Affiliation(s)
- Prajjwal Rai
- Division of Plant Pathology, Indian Agriculture Research Institute, New Delhi, India
| | - Laxman Prasad
- Division of Plant Pathology, Indian Agriculture Research Institute, New Delhi, India
| | - Pramod Kumar Rai
- Division of Plant Pathology, Directorate of Rapeseed-Mustard Research, Bharatpur, India
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4
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Pirc K, Albert I, Nürnberger T, Anderluh G. Disruption of plant plasma membrane by Nep1-like proteins in pathogen-plant interactions. THE NEW PHYTOLOGIST 2023; 237:746-750. [PMID: 36210522 PMCID: PMC10100409 DOI: 10.1111/nph.18524] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 09/07/2022] [Indexed: 06/16/2023]
Abstract
Lipid membrane destruction by microbial pore-forming toxins (PFTs) is a ubiquitous mechanism of damage to animal cells, but is less prominent in plants. Nep1-like proteins (NLPs) secreted by phytopathogens that cause devastating crop diseases, such as potato late blight, represent the only family of microbial PFTs that effectively damage plant cells by disrupting the integrity of the plant plasma membrane. Recent research has elucidated the molecular mechanism of NLP-mediated membrane damage, which is unique among microbial PFTs and highly adapted to the plant membrane environment. In this review, we cover recent insight into how NLP cytolysins damage plant membranes and cause cell death.
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Affiliation(s)
- Katja Pirc
- Department of Molecular Biology and NanobiotechnologyNational Institute of ChemistryHajdrihova 191000LjubljanaSlovenia
| | - Isabell Albert
- Molecular Plant PhysiologyFAU Erlangen‐Nüremberg91058ErlangenGermany
| | - Thorsten Nürnberger
- Center of Plant Molecular Biology (ZMBP)Eberhard‐Karls‐University Tübingen72076TübingenGermany
- Department of BiochemistryUniversity of JohannesburgAuckland Park2006JohannesburgSouth Africa
| | - Gregor Anderluh
- Department of Molecular Biology and NanobiotechnologyNational Institute of ChemistryHajdrihova 191000LjubljanaSlovenia
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Kronmiller BA, Feau N, Shen D, Tabima JF, Ali SS, Armitage AD, Arredondo F, Bailey BA, Bollmann SR, Dale A, Harrison RJ, Hrywkiw K, Kasuga T, McDougal R, Nellist CF, Panda P, Tripathy S, Williams NM, Ye W, Wang Y, Hamelin RC, Grünwald NJ. Comparative Genomic Analysis of 31 Phytophthora Genomes Reveals Genome Plasticity and Horizontal Gene Transfer. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2023; 36:26-46. [PMID: 36306437 DOI: 10.1094/mpmi-06-22-0133-r] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Phytophthora species are oomycete plant pathogens that cause great economic and ecological impacts. The Phytophthora genus includes over 180 known species, infecting a wide range of plant hosts, including crops, trees, and ornamentals. We sequenced the genomes of 31 individual Phytophthora species and 24 individual transcriptomes to study genetic relationships across the genus. De novo genome assemblies revealed variation in genome sizes, numbers of predicted genes, and in repetitive element content across the Phytophthora genus. A genus-wide comparison evaluated orthologous groups of genes. Predicted effector gene counts varied across Phytophthora species by effector family, genome size, and plant host range. Predicted numbers of apoplastic effectors increased as the host range of Phytophthora species increased. Predicted numbers of cytoplasmic effectors also increased with host range but leveled off or decreased in Phytophthora species that have enormous host ranges. With extensive sequencing across the Phytophthora genus, we now have the genomic resources to evaluate horizontal gene transfer events across the oomycetes. Using a machine-learning approach to identify horizontally transferred genes with bacterial or fungal origin, we identified 44 candidates over 36 Phytophthora species genomes. Phylogenetic reconstruction indicates that the transfers of most of these 44 candidates happened in parallel to major advances in the evolution of the oomycetes and Phytophthora spp. We conclude that the 31 genomes presented here are essential for investigating genus-wide genomic associations in genus Phytophthora. [Formula: see text] Copyright © 2023 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Brent A Kronmiller
- Center for Quantitative Life Sciences, Oregon State University, Corvallis, OR, U.S.A
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, U.S.A
| | - Nicolas Feau
- Department of Forest and Conservation Sciences, The University of British Columbia, Vancouver, Canada
| | - Danyu Shen
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, China
| | - Javier F Tabima
- Department of Biology, Clark University, Worcester, MA, U.S.A
| | - Shahin S Ali
- Sustainable Perennial Crops Laboratory, Northeast Area, USDA/ARS, Beltsville Agricultural Research Center-West, Beltsville, MD, U.S.A
| | - Andrew D Armitage
- Natural Resources Institute, University of Greenwich, Chatham Maritime, U.K
| | - Felipe Arredondo
- Center for Quantitative Life Sciences, Oregon State University, Corvallis, OR, U.S.A
- Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, U.S.A
| | - Bryan A Bailey
- Sustainable Perennial Crops Laboratory, Northeast Area, USDA/ARS, Beltsville Agricultural Research Center-West, Beltsville, MD, U.S.A
| | - Stephanie R Bollmann
- Department of Integrative Biology, Oregon State University, Corvallis, OR, U.S.A
| | - Angela Dale
- Department of Forest and Conservation Sciences, The University of British Columbia, Vancouver, Canada
- SC-New Construction Materials, FPInnovations, Vancouver, V6T 1Z4, Canada
| | | | - Kelly Hrywkiw
- Department of Forest and Conservation Sciences, The University of British Columbia, Vancouver, Canada
| | - Takao Kasuga
- Crops Pathology and Genetics Research Unit, Agricultural Research Service, United States Department of Agriculture, Davis, CA, U.S.A
| | - Rebecca McDougal
- Scion (Zealand Forest Research Institute), 49 Sala Street, Te Papa Tipu Innovation Park, Private Bag 3020, Rotorua, New Zealand
| | | | - Preeti Panda
- The New Zealand Institute for Plant and Food Research Ltd, 74 Gerald Street, Lincoln, 7608, New Zealand
| | | | - Nari M Williams
- Scion (Zealand Forest Research Institute), 49 Sala Street, Te Papa Tipu Innovation Park, Private Bag 3020, Rotorua, New Zealand
- Department of Pathogen Ecology and Control, Plant and Food Research, Private Bag 1401, Havelock North, New Zealand
| | - Wenwu Ye
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, China
| | - Yuanchao Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, China
| | - Richard C Hamelin
- Department of Forest and Conservation Sciences, The University of British Columbia, Vancouver, Canada
- Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval, Québec, Canada
- Département des sciences du bois et de la forêt, Faculté de Foresterie et Géographie, Université Laval, Québec, Canada
| | - Niklaus J Grünwald
- Horticultural Crop Research Unit, United States Department of Agriculture, Agricultural Research Service, Corvallis, OR, U.S.A
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Xiang J, Cheng J, Wei L, Li M, Wu J. Functional analysis of the Nep1-like proteins from Plasmopara viticola. PLANT SIGNALING & BEHAVIOR 2022; 17:2000791. [PMID: 35152834 PMCID: PMC9176246 DOI: 10.1080/15592324.2021.2000791] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 10/25/2021] [Accepted: 10/26/2021] [Indexed: 06/14/2023]
Abstract
Necrosis and ethylene-inducing peptide 1 (Nep1) -like proteins (NLP) are secreted by multiple taxonomically unrelated plant pathogens (bacteria, fungi, and oomycete) and are best known for inducing cell death and immune responses in dicotyledonous plants. A group of putative NLP genes from obligate biotrophic oomycete Plasmopara viticola were predicted by RNA-Seq in our previous study, but their activity has not been established. Therefore, we analyzed the P. viticola NLP (PvNLP) family and identified seven PvNLP genes. They all belong to type 1 NLP genes and form a P. viticola-specific cluster when compared with other pathogen NLP genes. The expression of PvNLPs was induced during early infection process and the expression patterns could be categorized into two groups. Agrobacterium tumefaciens-mediated transient expression assays revealed that only PvNLP7 was cytotoxic and could induce Phytophthora capsici resistance in Nicotiana benthamiana. Functional analysis showed that PvNLP4, PvNLP5, PvNLP7, and PvNLP10 significantly improved disease resistance of Arabidopsis thaliana to Hyaloperonospora arabidopsidis. Moreover, the four genes caused an inhibition of plant growth which is typically associated with enhanced immunity when over-expressed in Arabidopsis. Further research found that PvNLP7 could activate the expression of defense-related genes and its conserved NPP1 domain was critical for cell death- and immunity-inducing activity. This record of NLP genes from P. viticola showed a functional diversification, laying a foundation for further study on pathogenic mechanism of the devastating pathogen.
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Affiliation(s)
- Jiang Xiang
- Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Jianhui Cheng
- Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Lingzhu Wei
- Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Mingshan Li
- Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Jiang Wu
- Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
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Madina MH, Santhanam P, Asselin Y, Jaswal R, Bélanger RR. Progress and Challenges in Elucidating the Functional Role of Effectors in the Soybean- Phytophthora sojae Interaction. J Fungi (Basel) 2022; 9:jof9010012. [PMID: 36675833 PMCID: PMC9866111 DOI: 10.3390/jof9010012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 12/16/2022] [Accepted: 12/19/2022] [Indexed: 12/24/2022] Open
Abstract
Phytophthora sojae, the agent responsible for stem and root rot, is one of the most damaging plant pathogens of soybean. To establish a compatible-interaction, P. sojae secretes a wide array of effector proteins into the host cell. These effectors have been shown to act either in the apoplastic area or the cytoplasm of the cell to manipulate the host cellular processes in favor of the development of the pathogen. Deciphering effector-plant interactions is important for understanding the role of P. sojae effectors in disease progression and developing approaches to prevent infection. Here, we review the subcellular localization, the host proteins, and the processes associated with P. sojae effectors. We also discuss the emerging topic of effectors in the context of effector-resistance genes interaction, as well as model systems and recent developments in resources and techniques that may provide a better understanding of the soybean-P. sojae interaction.
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8
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The molecular dialog between oomycete effectors and their plant and animal hosts. FUNGAL BIOL REV 2022. [DOI: 10.1016/j.fbr.2022.10.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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9
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Hu Y, He Z, Kang Y, Ye W, Cui L. Identification of a C2H2 Transcription Factor (PsCZF3) Associated with RxLR Effectors and Carbohydrate-Active Enzymes in Phytophthora sojae Based on WGCNA. J Fungi (Basel) 2022; 8:jof8100998. [PMID: 36294563 PMCID: PMC9605361 DOI: 10.3390/jof8100998] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 09/13/2022] [Accepted: 09/17/2022] [Indexed: 11/16/2022] Open
Abstract
Phytophthora sojae is a destructive soybean pathogen that orchestrates various secreted proteins (effectors) to modulate plant immunity and facilitate infection. Although a number of effectors have been identified and functionally studied in P. sojae, the way these molecules are regulated is marginally known. In this study, we performed a weighted gene correlation network analysis (WGCNA) based on digital RNA-seq, which enabled the identification of a transcription factor (PsCZF3) in P. sojae. This transcription factor is a C2H2-type zinc finger protein that regulates the transcription of 35 RxLR effectors during the early infection stage. Phylogenetic analysis revealed that PsCZF3 is a highly conserved protein across oomycetes, suggesting that this regulation mechanism may broadly exist in oomycete species. In addition, by building a subnetwork of PsCZF3 and correlated genes, we also found that PsCZF3 contributed to the transcriptional regulation of carbohydrate-active enzymes. Our findings suggest that the activation of PsCZF3 facilitates P. sojae infection by up-regulating RxLR effectors and carbohydrate-active enzymes.
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Affiliation(s)
- Yanhong Hu
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang 471000, China
| | - Zhihua He
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang 471000, China
| | - Yebin Kang
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang 471000, China
| | - Wenwu Ye
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China
- Correspondence: (W.Y.); (L.C.)
| | - Linkai Cui
- College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang 471000, China
- Correspondence: (W.Y.); (L.C.)
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Dal'Sasso TCDS, Rocha VDD, Rody HVS, Costa MDBL, Oliveira LOD. The necrosis- and ethylene-inducing peptide 1-like protein (NLP) gene family of the plant pathogen Corynespora cassiicola. Curr Genet 2022; 68:645-659. [PMID: 36098767 DOI: 10.1007/s00294-022-01252-0] [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: 05/20/2022] [Revised: 08/10/2022] [Accepted: 08/12/2022] [Indexed: 11/25/2022]
Abstract
Effectors are secreted by plant-associated microorganisms to modify the host cell physiology. As effectors, the Necrosis- and Ethylene-inducing peptide 1-like proteins (NLPs) are involded in the early phases of plant infection and may trigger host immune responses. Corynespora cassiicola is a polyphagous plant pathogen that causes target spot on many agriculturally important crops. Using genome assembly, gene prediction, and proteome annotation tools, we retrieved 135 NLP-encoding genes from proteomes of 44 isolates. We explored the evolutionary history of NLPs using Bayesian phylogeny, gene genealogies, and selection analyses. We accessed the expression profiles of the NLP genes during the early phase of C. cassiicola-soybean interaction. Three NLP putative-effector genes (Cc_NLP1.1, Cc_NLP1.2A, and Cc_NLP1.2B) were maintained in the genomes of all isolates tested. An NLP putative-non-effector gene (Cc_NLP1.3) was found in three isolates that had been originally obtained from soybean. Putative-effector NLPs were under different selective constraints: Cc_NLP1.1 was under stronger selective pressure, while Cc_NLP1.2A was under a more relaxed constraint. Meanwhile, Cc_NLP1.2B likely evolved under either positive or balancing selection. Despite highly divergent, the putative-effector NLPs maintain conserved the residues necessary to trigger plant immune responses, suggesting they are potentially functional. Only the Cc_NLP1.1 putative-effector gene was significantly expressed at the early hours of soybean colonization, while Cc_NLP1.2A and Cc_NLP1.2B showed much lower levels of gene expression.
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Affiliation(s)
| | | | - Hugo Vianna Silva Rody
- Departamento de Genética, Universidade de São Paulo/Escola Superior de Agricultura "Luiz de Queiroz", Piracicaba, Brazil
| | | | - Luiz Orlando de Oliveira
- Departamento de Bioquímica e Biologia Molecular, Universidade Federal de Viçosa, Viçosa, Brazil.
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Daly P, Zhou D, Shen D, Chen Y, Xue T, Chen S, Zhang Q, Zhang J, McGowan J, Cai F, Pang G, Wang N, Sheikh TMM, Deng S, Li J, Soykam HO, Kara I, Fitzpatrick DA, Druzhinina IS, Bayram Akcapinar G, Wei L. Genome of Pythium myriotylum Uncovers an Extensive Arsenal of Virulence-Related Genes among the Broad-Host-Range Necrotrophic Pythium Plant Pathogens. Microbiol Spectr 2022; 10:e0226821. [PMID: 35946960 PMCID: PMC9430622 DOI: 10.1128/spectrum.02268-21] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Accepted: 06/30/2022] [Indexed: 11/20/2022] Open
Abstract
The Pythium (Peronosporales, Oomycota) genus includes devastating plant pathogens that cause widespread diseases and severe crop losses. Here, we have uncovered a far greater arsenal of virulence factor-related genes in the necrotrophic Pythium myriotylum than in other Pythium plant pathogens. The genome of a plant-virulent P. myriotylum strain (~70 Mb and 19,878 genes) isolated from a diseased rhizome of ginger (Zingiber officinale) encodes the largest repertoire of putative effectors, proteases, and plant cell wall-degrading enzymes (PCWDEs) among the studied species. P. myriotylum has twice as many predicted secreted proteins than any other Pythium plant pathogen. Arrays of tandem duplications appear to be a key factor of the enrichment of the virulence factor-related genes in P. myriotylum. The transcriptomic analysis performed on two P. myriotylum isolates infecting ginger leaves showed that proteases were a major part of the upregulated genes along with PCWDEs, Nep1-like proteins (NLPs), and elicitin-like proteins. A subset of P. myriotylum NLPs were analyzed and found to have necrosis-inducing ability from agroinfiltration of tobacco (Nicotiana benthamiana) leaves. One of the heterologously produced infection-upregulated putative cutinases found in a tandem array showed esterase activity with preferences for longer-chain-length substrates and neutral to alkaline pH levels. Our results allow the development of science-based targets for the management of P. myriotylum-caused disease, as insights from the genome and transcriptome show that gene expansion of virulence factor-related genes play a bigger role in the plant parasitism of Pythium spp. than previously thought. IMPORTANCE Pythium species are oomycetes, an evolutionarily distinct group of filamentous fungus-like stramenopiles. The Pythium genus includes several pathogens of important crop species, e.g., the spice ginger. Analysis of our genome from the plant pathogen Pythium myriotylum uncovered a far larger arsenal of virulence factor-related genes than found in other Pythium plant pathogens, and these genes contribute to the infection of the plant host. The increase in the number of virulence factor-related genes appears to have occurred through the mechanism of tandem gene duplication events. Genes from particular virulence factor-related categories that were increased in number and switched on during infection of ginger leaves had their activities tested. These genes have toxic activities toward plant cells or activities to hydrolyze polymeric components of the plant. The research suggests targets to better manage diseases caused by P. myriotylum and prompts renewed attention to the genomics of Pythium plant pathogens.
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Affiliation(s)
- Paul Daly
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Dongmei Zhou
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Danyu Shen
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Yifan Chen
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
- School of Environment and Safety Engineering, Jiangsu University, Zhenjiang, China
| | - Taiqiang Xue
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Siqiao Chen
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
- Jiangsu Provincial Key Lab of Organic Solid Waste Utilization, Fungal Genomics Laboratory (FungiG), Nanjing Agricultural University, Nanjing, China
| | - Qimeng Zhang
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Jinfeng Zhang
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Jamie McGowan
- Genome Evolution Laboratory, Maynooth University, Maynooth, Ireland
| | - Feng Cai
- Jiangsu Provincial Key Lab of Organic Solid Waste Utilization, Fungal Genomics Laboratory (FungiG), Nanjing Agricultural University, Nanjing, China
- School of Ecology, Sun Yat-sen University, Shenzhen, China
| | - Guan Pang
- Jiangsu Provincial Key Lab of Organic Solid Waste Utilization, Fungal Genomics Laboratory (FungiG), Nanjing Agricultural University, Nanjing, China
| | - Nan Wang
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Taha Majid Mahmood Sheikh
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Sheng Deng
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Jingjing Li
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
| | - Hüseyin Okan Soykam
- Department of Biostatistics and Bioinformatics, Institute of Health Sciences, Acibadem Mehmet Ali Aydinlar University, Istanbul, Turkey
| | - Irem Kara
- Department of Biostatistics and Bioinformatics, Institute of Health Sciences, Acibadem Mehmet Ali Aydinlar University, Istanbul, Turkey
| | | | - Irina S. Druzhinina
- Jiangsu Provincial Key Lab of Organic Solid Waste Utilization, Fungal Genomics Laboratory (FungiG), Nanjing Agricultural University, Nanjing, China
- Department of Accelerated Taxonomy, The Royal Botanic Gardens Kew, London, United Kingdom
| | - Günseli Bayram Akcapinar
- Department of Medical Biotechnology, Institute of Health Sciences, Acibadem Mehmet Ali Aydinlar University, Istanbul, Turkey
| | - Lihui Wei
- Key Lab of Food Quality and Safety of Jiangsu Province—State Key Laboratory Breeding Base, Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
- School of Environment and Safety Engineering, Jiangsu University, Zhenjiang, China
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12
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Steentjes MBF, Herrera Valderrama AL, Fouillen L, Bahammou D, Leisen T, Albert I, Nürnberger T, Hahn M, Mongrand S, Scholten OE, van Kan JAL. Cytotoxic activity of Nep1-like proteins on monocots. THE NEW PHYTOLOGIST 2022; 235:690-700. [PMID: 35383933 PMCID: PMC9320973 DOI: 10.1111/nph.18146] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/01/2022] [Accepted: 03/30/2022] [Indexed: 06/14/2023]
Abstract
Necrosis- and ethylene-inducing peptide 1 (Nep1)-like proteins (NLPs) are found throughout several plant-associated microbial taxa and are typically considered to possess cytolytic activity exclusively on dicot plant species. However, cytolytic NLPs are also produced by pathogens of monocot plants such as the onion (Allium cepa) pathogen Botrytis squamosa. We determined the cytotoxic activity of B. squamosa BsNep1, as well as other previously characterized NLPs, on various monocot plant species and assessed the plant plasma membrane components required for NLP sensitivity. Leaf infiltration of NLPs showed that onion cultivars are differentially sensitive to NLPs, and analysis of their sphingolipid content revealed that the GIPC series A : series B ratio did not correlate to NLP sensitivity. A tri-hybrid population derived from a cross between onion and two wild relatives showed variation in NLP sensitivity within the population. We identified a quantitative trait locus (QTL) for NLP insensitivity that colocalized with a previously identified QTL for B. squamosa resistance and the segregating trait of NLP insensitivity correlated with the sphingolipid content. Our results demonstrate the cytotoxic activity of NLPs on several monocot plant species and legitimize their presence in monocot-specific plant pathogens.
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Affiliation(s)
| | | | - Laetitia Fouillen
- Laboratoire de Biogènese MembranaireUMR 5200CNRSUniversity of BordeauxF‐33140Villenave d’OrnonFrance
| | - Delphine Bahammou
- Laboratoire de Biogènese MembranaireUMR 5200CNRSUniversity of BordeauxF‐33140Villenave d’OrnonFrance
| | - Thomas Leisen
- Department of Biology, Plant PathologyUniversity of KaiserslauternKaiserslautern67663Germany
| | - Isabell Albert
- Molecular Plant PhysiologyFAU Erlangen‐NürnbergErlangen91058Germany
| | | | - Matthias Hahn
- Department of Biology, Plant PathologyUniversity of KaiserslauternKaiserslautern67663Germany
| | - Sébastien Mongrand
- Laboratoire de Biogènese MembranaireUMR 5200CNRSUniversity of BordeauxF‐33140Villenave d’OrnonFrance
| | - Olga E. Scholten
- Plant BreedingWageningen University & ResearchWageningen6708 PBthe Netherlands
| | - Jan A. L. van Kan
- Laboratory of PhytopathologyWageningen UniversityWageningen6708 PBthe Netherlands
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13
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Yang G, Yang J, Zhang Q, Wang W, Feng L, Zhao L, An B, Wang Q, He C, Luo H. The Effector Protein CgNLP1 of Colletotrichum gloeosporioides Affects Invasion and Disrupts Nuclear Localization of Necrosis-Induced Transcription Factor HbMYB8-Like to Suppress Plant Defense Signaling. Front Microbiol 2022; 13:911479. [PMID: 35770165 PMCID: PMC9234567 DOI: 10.3389/fmicb.2022.911479] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Accepted: 05/13/2022] [Indexed: 11/13/2022] Open
Abstract
Fungi secrete numerous effectors to modulate host defense systems. Understanding the molecular mechanisms by which fungal effectors regulate plant defense is of great importance for the development of novel strategies for disease control. In this study, we identified necrosis- and ethylene-inducing protein 1 (Nep1)-like protein (NLP) effector gene, CgNLP1, which contributed to conidial germination, appressorium formation, invasive growth, and virulence of Colletotrichum gloeosporioides to the rubber tree. Transient expression of CgNLP1 in the leaves of Nicotiana benthamiana induced ethylene production in plants. Ectopic expression of CgNLP1 in Arabidopsis significantly enhanced the resistance to Botrytis cinerea and Alternaria brassicicola. An R2R3 type transcription factor HbMYB8-like of rubber tree was identified as the target of CgNLP1.HbMYB8-like, localized on the nucleus, and induced cell death in N. benthamiana. CgNLP1 disrupted nuclear accumulation of HbMYB8-like and suppressed HbMYB8-like induced cell death, which is mediated by the salicylic acid (SA) signal pathway. This study suggested a new strategy whereby C. gloeosporioides exploited the CgNLP1 effector to affect invasion and suppress a host defense regulator HbMYB8-like to facilitate infection.
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Affiliation(s)
- Guangyong Yang
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Corps, Hainan University, Haikou, China
- Hainan Yazhou Bay Seed Laboratory, Sanya Nanfan Research Institute of Hainan University, Sanya, China
| | - Jie Yang
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Corps, Hainan University, Haikou, China
- Hainan Yazhou Bay Seed Laboratory, Sanya Nanfan Research Institute of Hainan University, Sanya, China
| | - Qiwei Zhang
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Corps, Hainan University, Haikou, China
- Hainan Yazhou Bay Seed Laboratory, Sanya Nanfan Research Institute of Hainan University, Sanya, China
| | - Wenfeng Wang
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Corps, Hainan University, Haikou, China
| | - Liping Feng
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Corps, Hainan University, Haikou, China
| | - Li Zhao
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Corps, Hainan University, Haikou, China
| | - Bang An
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Corps, Hainan University, Haikou, China
- Hainan Yazhou Bay Seed Laboratory, Sanya Nanfan Research Institute of Hainan University, Sanya, China
| | - Qiannan Wang
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Corps, Hainan University, Haikou, China
- Hainan Yazhou Bay Seed Laboratory, Sanya Nanfan Research Institute of Hainan University, Sanya, China
| | - Chaozu He
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Corps, Hainan University, Haikou, China
- Hainan Yazhou Bay Seed Laboratory, Sanya Nanfan Research Institute of Hainan University, Sanya, China
| | - Hongli Luo
- Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, College of Tropical Corps, Hainan University, Haikou, China
- Hainan Yazhou Bay Seed Laboratory, Sanya Nanfan Research Institute of Hainan University, Sanya, China
- *Correspondence: Hongli Luo
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14
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Midgley KA, van den Berg N, Swart V. Unraveling Plant Cell Death during Phytophthora Infection. Microorganisms 2022; 10:microorganisms10061139. [PMID: 35744657 PMCID: PMC9229607 DOI: 10.3390/microorganisms10061139] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Revised: 05/25/2022] [Accepted: 05/30/2022] [Indexed: 01/02/2023] Open
Abstract
Oomycetes form a distinct phylogenetic lineage of fungus-like eukaryotic microorganisms, of which several hundred organisms are considered among the most devastating plant pathogens—especially members of the genus Phytophthora. Phytophthora spp. have a large repertoire of effectors that aid in eliciting a susceptible response in host plants. What is of increasing interest is the involvement of Phytophthora effectors in regulating programed cell death (PCD)—in particular, the hypersensitive response. There have been numerous functional characterization studies, which demonstrate Phytophthora effectors either inducing or suppressing host cell death, which may play a crucial role in Phytophthora’s ability to regulate their hemi-biotrophic lifestyle. Despite several advances in techniques used to identify and characterize Phytophthora effectors, knowledge is still lacking for some important species, including Phytophthora cinnamomi. This review discusses what the term PCD means and the gap in knowledge between pathogenic and developmental forms of PCD in plants. We also discuss the role cell death plays in the virulence of Phytophthora spp. and the effectors that have so far been identified as playing a role in cell death manipulation. Finally, we touch on the different techniques available to study effector functions, such as cell death induction/suppression.
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15
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Cordelier S, Crouzet J, Gilliard G, Dorey S, Deleu M, Dhondt-Cordelier S. Deciphering the role of plant plasma membrane lipids in response to invasion patterns: how could biology and biophysics help? JOURNAL OF EXPERIMENTAL BOTANY 2022; 73:2765-2784. [PMID: 35560208 DOI: 10.1093/jxb/erab517] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 11/25/2021] [Indexed: 06/15/2023]
Abstract
Plants have to constantly face pathogen attacks. To cope with diseases, they have to detect the invading pathogen as early as possible via the sensing of conserved motifs called invasion patterns. The first step of perception occurs at the plasma membrane. While many invasion patterns are perceived by specific proteinaceous immune receptors, several studies have highlighted the influence of the lipid composition and dynamics of the plasma membrane in the sensing of invasion patterns. In this review, we summarize current knowledge on how some microbial invasion patterns could interact with the lipids of the plasma membrane, leading to a plant immune response. Depending on the invasion pattern, different mechanisms are involved. This review outlines the potential of combining biological with biophysical approaches to decipher how plasma membrane lipids are involved in the perception of microbial invasion patterns.
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Affiliation(s)
- Sylvain Cordelier
- Université de Reims Champagne Ardenne, RIBP EA 4707, USC INRAE 1488, SFR Condorcet FR CNRS 3417, 51100 Reims, France
| | - Jérôme Crouzet
- Université de Reims Champagne Ardenne, RIBP EA 4707, USC INRAE 1488, SFR Condorcet FR CNRS 3417, 51100 Reims, France
| | - Guillaume Gilliard
- Laboratoire de Biophysique Moléculaire aux Interfaces, SFR Condorcet FR CNRS 3417, TERRA Research Center, Gembloux Agro-Bio Tech, Université de Liège, 2 Passage des Déportés, B-5030 Gembloux, Belgium
| | - Stéphan Dorey
- Université de Reims Champagne Ardenne, RIBP EA 4707, USC INRAE 1488, SFR Condorcet FR CNRS 3417, 51100 Reims, France
| | - Magali Deleu
- Laboratoire de Biophysique Moléculaire aux Interfaces, SFR Condorcet FR CNRS 3417, TERRA Research Center, Gembloux Agro-Bio Tech, Université de Liège, 2 Passage des Déportés, B-5030 Gembloux, Belgium
| | - Sandrine Dhondt-Cordelier
- Université de Reims Champagne Ardenne, RIBP EA 4707, USC INRAE 1488, SFR Condorcet FR CNRS 3417, 51100 Reims, France
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16
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Gajewska J, Floryszak-Wieczorek J, Sobieszczuk-Nowicka E, Mattoo A, Arasimowicz-Jelonek M. Fungal and oomycete pathogens and heavy metals: an inglorious couple in the environment. IMA Fungus 2022; 13:6. [PMID: 35468869 PMCID: PMC9036806 DOI: 10.1186/s43008-022-00092-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2021] [Accepted: 04/07/2022] [Indexed: 01/30/2023] Open
Abstract
Heavy metal (HM) contamination of the environment is a major problem worldwide. The rate of global deposition of HMs in soil has dramatically increased over the past two centuries and there of facilitated their rapid accumulation also in living systems. Although the effects of HMs on plants, animals and humans have been extensively studied, yet little is known about their effects on the (patho)biology of the microorganisms belonging to a unique group of filamentous eukaryotic pathogens, i.e., fungi and oomycetes. Much of the literature concerning mainly model species has revealed that HM stress affects their hyphal growth, morphology, and sporulation. Toxicity at cellular level leads to disturbance of redox homeostasis manifested by the formation of nitro-oxidative intermediates and to the induction of antioxidant machinery. Despite such adverse effects, published data is indicative of the fact that fungal and oomycete pathogens have a relatively high tolerance to HMs in comparison to other groups of microbes such as bacteria. Likely, these pathogens may harbor a network of detoxification mechanisms that ensure their survival in a highly HM-polluted (micro)habitat. Such a network may include extracellular HMs immobilization, biosorption to cell wall, and/or their intracellular sequestration to proteins or other ligands. HMs may also induce a hormesis-like phenomenon allowing the pathogens to maintain or even increase fitness against chemical challenges. Different scenarios linking HMs stress and modification of the microorganisms pathogenicity are disscused in this review.
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Yang K, Chen C, Wang Y, Li J, Dong X, Cheng Y, Zhang H, Zhai Y, Ai G, Song Q, Wang B, Liu W, Yin Z, Peng H, Shen D, Fang S, Dou D, Jing M. Nep1-Like Proteins From the Biocontrol Agent Pythium oligandrum Enhance Plant Disease Resistance Independent of Cell Death and Reactive Oxygen Species. FRONTIERS IN PLANT SCIENCE 2022; 13:830636. [PMID: 35310640 PMCID: PMC8931738 DOI: 10.3389/fpls.2022.830636] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 01/12/2022] [Indexed: 05/30/2023]
Abstract
Microbial necrosis and ethylene-inducing peptide 1 (Nep1)-like proteins (NLPs) act as cytolytic toxins and immunogenic patterns in plants. Our previous work shows that cytolytic NLPs (i.e., PyolNLP5 and PyolNLP7) from the biocontrol agent Pythium oligandrum enhance plant resistance against Phytophthora pathogens by inducing the expression of plant defensins. However, the relevance between PyolNLP-induced necrosis and plant resistance activation is still unclear. Here, we find that the necrosis-inducing activity of PyolNLP5 requires amino acid residues D127 and E129 within the conserved "GHRHDLE" motif. However, PyolNLP5-mediated plant disease resistance is irrelevant to its necrosis-inducing activity and the accumulation of reactive oxygen species (ROS). Furthermore, we reveal the positive role of non-cytotoxic PyolNLPs in enhancing plant resistance against Phytophthora pathogens and the fugal pathogen Sclerotinia sclerotiorum. Similarly, non-cytotoxic PyolNLPs also activate plant defense in a cell death-independent manner and induce defensin expression. The functions of non-cytotoxic PyolNLP13/14 rely on their conserved nlp24-like peptide pattern. Synthetic Pyolnlp24s derived from both cytotoxic and non-cytotoxic PyolNLPs can induce plant defensin expression. Unlike classic nlp24, Pyolnlp24s lack the ability of inducing ROS burst in plants with the presence of Arabidopsis nlp24 receptor RLP23. Taken together, our work demonstrates that PyolNLPs enhance plant resistance in an RLP23-independent manner, which requires the conserved nlp24-like peptide pattern but is uncoupled with ROS burst and cell death.
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Affiliation(s)
- Kun Yang
- Department of Plant Pathology, Nanjing Agricultural University, Key Laboratory of Biological Interaction and Crop Health, Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, China
| | - Chao Chen
- College of Plant Protection, Anhui Agricultural University, Hefei, China
| | - Yi Wang
- Department of Plant Pathology, Nanjing Agricultural University, Key Laboratory of Biological Interaction and Crop Health, Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, China
| | - Jialu Li
- Department of Plant Pathology, Nanjing Agricultural University, Key Laboratory of Biological Interaction and Crop Health, Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, China
| | - Xiaohua Dong
- Department of Plant Pathology, Nanjing Agricultural University, Key Laboratory of Biological Interaction and Crop Health, Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, China
| | - Yang Cheng
- Department of Plant Pathology, Nanjing Agricultural University, Key Laboratory of Biological Interaction and Crop Health, Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, China
| | - Huanxin Zhang
- Department of Plant Pathology, Nanjing Agricultural University, Key Laboratory of Biological Interaction and Crop Health, Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, China
| | - Ying Zhai
- Department of Plant Pathology, Washington State University, Pullman, WA, United States
| | - Gan Ai
- Department of Plant Pathology, Nanjing Agricultural University, Key Laboratory of Biological Interaction and Crop Health, Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, China
| | | | | | - Wentao Liu
- Shandong Linyi Tobacco Co., Ltd., Linyi, China
| | - Zhiyuan Yin
- Department of Plant Pathology, Nanjing Agricultural University, Key Laboratory of Biological Interaction and Crop Health, Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, China
| | - Hao Peng
- Department of Plant Pathology, Washington State University, Pullman, WA, United States
| | - Danyu Shen
- Department of Plant Pathology, Nanjing Agricultural University, Key Laboratory of Biological Interaction and Crop Health, Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, China
| | - Song Fang
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, China
| | - Daolong Dou
- Department of Plant Pathology, Nanjing Agricultural University, Key Laboratory of Biological Interaction and Crop Health, Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, China
| | - Maofeng Jing
- Department of Plant Pathology, Nanjing Agricultural University, Key Laboratory of Biological Interaction and Crop Health, Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, China
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Examining the Interaction between Phytophthora sojae and Soybean Cyst Nematode on Soybean (Glycine max). PLANTS 2022; 11:plants11040560. [PMID: 35214893 PMCID: PMC8880169 DOI: 10.3390/plants11040560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 02/15/2022] [Accepted: 02/17/2022] [Indexed: 12/02/2022]
Abstract
Phytophthora sojae and soybean cyst nematode (SCN) are important pathogens of soybean. Although these pathogens infect soybean roots, there is limited evidence of any interaction between them. The objective of this study was to examine the interaction between SCN and P. sojae on soybean in the greenhouse. Seeds of four soybean cultivars (Jack, Surge, Williams 82, Williams) were pre-germinated and placed in cone-tainers (Stuewe and Sons Inc., Tangent, OR, USA), containing a steam pasteurized sand-clay mixture. The experiment was set up in a completely randomized design with five replications and performed twice. Two P. sojae isolates were used in this study that represented two different virulence pathotypes (simple and complex pathotypes). For each isolate, soybean plants were not inoculated, inoculated with one of the treatments—SCN, P. sojae, and combination of P. sojae and SCN. After 35 DOI, stem length, root length, plant weight, root weight, lesion length, and SCN population were recorded. On all soybean cultivars with different types of incomplete resistance, the complex pathotype (PS-15-TF3) influenced the lesion length (mm) in the presence of SCN. However, the SCN population was reduced by both complex and simple pathotypes of P. sojae. This suggests that use both SCN and P. sojae resistance cultivars, can manage the disease complex and reduce soybean yield loss.
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19
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Duhan D, Gajbhiye S, Jaswal R, Singh RP, Sharma TR, Rajarammohan S. Functional Characterization of the Nep1-Like Protein Effectors of the Necrotrophic Pathogen - Alternaria brassicae. Front Microbiol 2021; 12:738617. [PMID: 34764943 PMCID: PMC8576325 DOI: 10.3389/fmicb.2021.738617] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 09/29/2021] [Indexed: 11/23/2022] Open
Abstract
Alternaria brassicae is an important necrotrophic pathogen that infects the Brassicaceae family. A. brassicae, like other necrotrophs, also secretes various proteinaceous effectors and metabolites that cause cell death to establish itself in the host. However, there has been no systematic study of A. brassicae effectors and their roles in pathogenesis. The availability of the genome sequence of A. brassicae in public domain has enabled the search for effectors and their functional characterization. Nep1-like proteins (NLPs) are a superfamily of proteins that induce necrosis and ethylene biosynthesis. They have been reported from a variety of microbes including bacteria, fungi, and oomycetes. In this study, we identified two NLPs from A. brassicae viz. AbrNLP1 and AbrNLP2 and functionally characterized them. Although both AbrNLPs were found to be secretory in nature, they localized differentially inside the plant. AbrNLP2 was found to induce necrosis in both host and non-host species, while AbrNLP1 could not induce necrosis in both species. Additionally, AbrNLP2 was shown to induce pathogen-associated molecular pattern (PAMP)-triggered immunity in both host and non-host species. Overall, our study indicates that AbrNLPs are functionally and spatially (subcellular location) distinct and may play different but important roles during the pathogenesis of A. brassicae.
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Affiliation(s)
- Deepak Duhan
- Agricultural Biotechnology Division, National Agri-Food Biotechnology Institute, Mohali, India
| | - Shivani Gajbhiye
- Agricultural Biotechnology Division, National Agri-Food Biotechnology Institute, Mohali, India
| | - Rajdeep Jaswal
- Agricultural Biotechnology Division, National Agri-Food Biotechnology Institute, Mohali, India
| | - Ravindra Pal Singh
- Nutritional Biotechnology Division, National Agri-Food Biotechnology Institute, Mohali, India
| | - Tilak Raj Sharma
- Indian Council of Agricultural Research, Division of Crop Science, Krishi Bhavan, New Delhi, India
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20
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Liu J, Nie J, Chang Y, Huang L. Nep1-like Proteins from Valsa mali Differentially Regulate Pathogen Virulence and Response to Abiotic Stresses. J Fungi (Basel) 2021; 7:830. [PMID: 34682251 PMCID: PMC8539816 DOI: 10.3390/jof7100830] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 09/27/2021] [Accepted: 10/01/2021] [Indexed: 01/10/2023] Open
Abstract
Necrosis and ethylene-inducing peptide 1(Nep1)-like protein (NLP) is well known for its cytotoxicity and immunogenicity on dicotyledonous, and it has attracted large attention due to its gene expansion and functional diversification in numerous phytopathogens. Here, two NLP family proteins, VmNLP1 and VmNLP2, were identified in the pathogenic fungus Valsa mali. We showed that VmNLP2 but not VmNLP1 induced cell death when transiently expressed in Nicotiana benthamiana. VmNLP2 was also shown to induce cell death in apple leaves via the treatment of the Escherichia coli-produced recombinant protein. VmNLP1 and VmNLP2 transcripts were drastically induced at the early stage of V. mali infection, whereas only VmNLP2 was shown to be essential for pathogen virulence. We also found that VmNLP1 and VmNLP2 are required for maintaining the integrity of cell membranes, and they differentially contribute to V. mali tolerance to salt- and osmo-stresses. Notably, multiple sequence alignment revealed that the second histidine (H) among the conserved heptapeptide (GHRHDWE) of VmNLP2 is mutated to tyrosine (Y). When this tyrosine (Y) was substituted by histidine (H), the variant displayed enhanced cytotoxicity in N. benthamiana, as well as enhanced virulence on apple leaves, suggesting that the virulence role of VmNLP2 probably correlates to its cytotoxicity activity. We further showed that the peptide among VmNLP2, called nlp25 (VmNLP2), triggered strong immune response in Arabidopsis thaliana. This work demonstrates that NLPs from V. mali involve multiple biological roles, and shed new light on how intricately complex the functions of NLP might be.
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Affiliation(s)
| | | | | | - Lili Huang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Xianyang 712100, Shaanxi, China; (J.L.); (J.N.); (Y.C.)
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21
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Xu Y, Zhang Y, Zhu J, Sun Y, Guo B, Liu F, Huang J, Wang H, Dong S, Wang Y, Wang Y. Phytophthora sojae apoplastic effector AEP1 mediates sugar uptake by mutarotation of extracellular aldose and is recognized as a MAMP. PLANT PHYSIOLOGY 2021; 187:321-335. [PMID: 34618132 PMCID: PMC8418418 DOI: 10.1093/plphys/kiab239] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 05/04/2021] [Indexed: 05/03/2023]
Abstract
Diseases caused by Phytophthora pathogens devastate many crops worldwide. During infection, Phytophthora pathogens secrete effectors, which are central molecules for understanding the complex plant-Phytophthora interactions. In this study, we profiled the effector repertoire secreted by Phytophthora sojae into the soybean (Glycine max) apoplast during infection using liquid chromatography-mass spectrometry. A secreted aldose 1-epimerase (AEP1) was shown to induce cell death in Nicotiana benthamiana, as did the other two AEP1s from different Phytophthora species. AEP1 could also trigger immune responses in N. benthamiana, other Solanaceae plants, and Arabidopsis (Arabidopsis thaliana). A glucose dehydrogenase assay revealed AEP1 encodes an active AEP1. The enzyme activity of AEP1 is dispensable for AEP1-triggered cell death and immune responses, while AEP-triggered immune signaling in N. benthamiana requires the central immune regulator BRASSINOSTEROID INSENSITIVE 1-associated receptor kinase 1. In addition, AEP1 acts as a virulence factor that mediates P. sojae extracellular sugar uptake by mutarotation of extracellular aldose from the α-anomer to the β-anomer. Taken together, these results revealed the function of a microbial apoplastic effector, highlighting the importance of extracellular sugar uptake for Phytophthora infection. To counteract, the key effector for sugar conversion can be recognized by the plant membrane receptor complex to activate plant immunity.
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Affiliation(s)
- Yuanpeng Xu
- Department of Plant Pathology, the Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, the Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Yunhuan Zhang
- Department of Plant Pathology, the Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, the Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Jinyin Zhu
- Department of Plant Pathology, the Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, the Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Yujing Sun
- Department of Plant Pathology, the Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, the Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Baodian Guo
- Department of Plant Pathology, the Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, the Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Fan Liu
- Department of Plant Pathology, the Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, the Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Jie Huang
- Department of Plant Pathology, the Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, the Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Haonan Wang
- Department of Plant Pathology, the Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, the Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Suomeng Dong
- Department of Plant Pathology, the Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, the Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Yan Wang
- Department of Plant Pathology, the Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, the Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
| | - Yuanchao Wang
- Department of Plant Pathology, the Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, the Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing 210095, China
- Author for communication:
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Yang K, Dong X, Li J, Wang Y, Cheng Y, Zhai Y, Li X, Wei L, Jing M, Dou D. Type 2 Nep1-Like Proteins from the Biocontrol Oomycete Pythium oligandrum Suppress Phytophthora capsici Infection in Solanaceous Plants. J Fungi (Basel) 2021; 7:496. [PMID: 34206578 PMCID: PMC8303654 DOI: 10.3390/jof7070496] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/18/2021] [Accepted: 06/21/2021] [Indexed: 02/04/2023] Open
Abstract
As a non-pathogenic oomycete, the biocontrol agent Pythium oligandrum is able to control plant diseases through direct mycoparasite activity and boosting plant immune responses. Several P. oligandrum elicitors have been found to activate plant immunity as microbe-associated molecular patterns (MAMPs). Necrosis- and ethylene-inducing peptide 1 (Nep1)-like proteins (NLPs) are a group of MAMPs widely distributed in eukaryotic and prokaryotic plant pathogens. However, little is known about their distribution and functions in P. oligandrum and its sister species Pythium periplocum. Here, we identified a total of 25 NLPs from P. oligandrum (PyolNLPs) and P. periplocum (PypeNLPs). Meanwhile, we found that PyolNLPs/PypeNLPs genes cluster in two chromosomal segments, and our analysis suggests that they expand by duplication and share a common origin totally different from that of pathogenic oomycetes. Nine PyolNLPs/PypeNLPs induced necrosis in Nicotiana benthamiana by agroinfiltration. Eight partially purified PyolNLPs/PypeNLPs were tested for their potential biocontrol activity. PyolNLP5 and PyolNLP7 showed necrosis-inducing activity in N. benthamiana via direct protein infiltration. At sufficient concentrations, they both significantly reduced disease severity and suppressed the in planta growth of Phytophthora capsici in solanaceous plants including N. benthamiana (tobacco), Solanum lycopersicum (tomato) and Capsicum annuum (pepper). Our assays suggest that the Phytophthora suppression effect of PyolNLP5 and PyolNLP7 is irrelevant to reactive oxygen species (ROS) accumulation. Instead, they induce the expression of antimicrobial plant defensin genes, and the induction depends on their conserved nlp24-like peptide pattern. This work demonstrates the biocontrol role of two P. oligandrum NLPs for solanaceous plants, which uncovers a novel approach of utilizing NLPs to develop bioactive formulae for oomycete pathogen control with no ROS-caused injury to plants.
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Affiliation(s)
- Kun Yang
- The Key Laboratory of Plant Immunity, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; (K.Y.); (X.D.); (J.L.); (Y.W.); (Y.C.)
| | - Xiaohua Dong
- The Key Laboratory of Plant Immunity, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; (K.Y.); (X.D.); (J.L.); (Y.W.); (Y.C.)
| | - Jialu Li
- The Key Laboratory of Plant Immunity, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; (K.Y.); (X.D.); (J.L.); (Y.W.); (Y.C.)
| | - Yi Wang
- The Key Laboratory of Plant Immunity, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; (K.Y.); (X.D.); (J.L.); (Y.W.); (Y.C.)
| | - Yang Cheng
- The Key Laboratory of Plant Immunity, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; (K.Y.); (X.D.); (J.L.); (Y.W.); (Y.C.)
| | - Ying Zhai
- Department of Plant Pathology, Washington State University, Pullman, WA 99164, USA;
| | - Xiaobo Li
- Crops Research Institute, Guangdong Academy of Agricultural Sciences/Guangdong Provincial Key Laboratory of Crop Genetic Improvement, Guangzhou 510640, China;
| | - Lihui Wei
- Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China;
| | - Maofeng Jing
- The Key Laboratory of Plant Immunity, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; (K.Y.); (X.D.); (J.L.); (Y.W.); (Y.C.)
| | - Daolong Dou
- The Key Laboratory of Plant Immunity, College of Plant Protection, Nanjing Agricultural University, Nanjing 210095, China; (K.Y.); (X.D.); (J.L.); (Y.W.); (Y.C.)
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23
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Engelbrecht J, Duong TA, Prabhu SA, Seedat M, van den Berg N. Genome of the destructive oomycete Phytophthora cinnamomi provides insights into its pathogenicity and adaptive potential. BMC Genomics 2021; 22:302. [PMID: 33902447 PMCID: PMC8074420 DOI: 10.1186/s12864-021-07552-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 03/24/2021] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND Phytophthora cinnamomi is an oomycete pathogen of global relevance. It is considered as one of the most invasive species, which has caused irreversible damage to natural ecosystems and horticultural crops. There is currently a lack of a high-quality reference genome for this species despite several attempts that have been made towards sequencing its genome. The lack of a good quality genome sequence has been a setback for various genetic and genomic research to be done on this species. As a consequence, little is known regarding its genome characteristics and how these contribute to its pathogenicity and invasiveness. RESULTS In this work we generated a high-quality genome sequence and annotation for P. cinnamomi using a combination of Oxford Nanopore and Illumina sequencing technologies. The annotation was done using RNA-Seq data as supporting gene evidence. The final assembly consisted of 133 scaffolds, with an estimated genome size of 109.7 Mb, N50 of 1.18 Mb, and BUSCO completeness score of 97.5%. Genome partitioning analysis revealed that P. cinnamomi has a two-speed genome characteristic, similar to that of other oomycetes and fungal plant pathogens. In planta gene expression analysis revealed up-regulation of pathogenicity-related genes, suggesting their important roles during infection and host degradation. CONCLUSION This study has provided a high-quality reference genome and annotation for P. cinnamomi. This is among the best assembled genomes for any Phytophthora species assembled to date and thus resulted in improved identification and characterization of pathogenicity-related genes, some of which were undetected in previous versions of genome assemblies. Phytophthora cinnamomi harbours a large number of effector genes which are located in the gene-poor regions of the genome. This unique genomic partitioning provides P. cinnamomi with a high level of adaptability and could contribute to its success as a highly invasive species. Finally, the genome sequence, its annotation and the pathogenicity effectors identified in this study will serve as an important resource that will enable future studies to better understand and mitigate the impact of this important pathogen.
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Affiliation(s)
- Juanita Engelbrecht
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa.
| | - Tuan A Duong
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
| | - S Ashok Prabhu
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
| | - Mohamed Seedat
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
| | - Noëlani van den Berg
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
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24
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Wang N, Yin Z, Duan W, Zhang X, Pi L, Zhang Y, Dou D. sORF-Encoded Polypeptide SEP1 Is a Novel Virulence Factor of Phytophthora Pathogens. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2021; 34:157-167. [PMID: 33103962 DOI: 10.1094/mpmi-06-20-0160-r] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Diseases caused by the notorious Phytophthora spp. result in enormous economic losses to crops and forests. Increasing evidence suggests that small open reading frame-encoded polypeptides (SEPs) participate in environmental responses of animals, plants, and fungi. However, it remains largely unknown whether Phytophthora pathogens produce SEPs. Here, we systematically predicted and identified 96 SEP candidates in P. capsici. Among them, three may induce stable cell death in Nicotiana benthamiana. Phytophthora-specific and conserved SEP1 facilitated P. capsici infection. PcSEP1-induced cell death is BAK1 and SOBIR1 independent and is correlated with its virulence function. Finally, PcSEP1 may be targeted to the apoplast for carrying out its functions, for which the C terminus is indispensable. Together, our results demonstrated that SEP1 is a new virulence factor, and previously unknown SEPs may act as effector proteins in Phytophthora pathogens.[Formula: see text] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license.
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Affiliation(s)
- Nan Wang
- College of Plant Protection, China Agricultural University, Beijing, China
| | - Zhiyuan Yin
- College of Plant Protection, China Agricultural University, Beijing, China
| | - Weiwei Duan
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
| | - Xiong Zhang
- College of Plant Protection, China Agricultural University, Beijing, China
| | - Lei Pi
- College of Plant Protection, China Agricultural University, Beijing, China
| | - Yifan Zhang
- College of Plant Protection, China Agricultural University, Beijing, China
| | - Daolong Dou
- College of Plant Protection, China Agricultural University, Beijing, China
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China
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25
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Harris JM, Balint-Kurti P, Bede JC, Day B, Gold S, Goss EM, Grenville-Briggs LJ, Jones KM, Wang A, Wang Y, Mitra RM, Sohn KH, Alvarez ME. What are the Top 10 Unanswered Questions in Molecular Plant-Microbe Interactions? MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2020; 33:1354-1365. [PMID: 33106084 DOI: 10.1094/mpmi-08-20-0229-cr] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This article is part of the Top 10 Unanswered Questions in MPMI invited review series.The past few decades have seen major discoveries in the field of molecular plant-microbe interactions. As the result of technological and intellectual advances, we are now able to answer questions at a level of mechanistic detail that we could not have imagined possible 20 years ago. The MPMI Editorial Board felt it was time to take stock and reassess. What big questions remain unanswered? We knew that to identify the fundamental, overarching questions that drive our research, we needed to do this as a community. To reach a diverse audience of people with different backgrounds and perspectives, working in different areas of plant-microbe interactions, we queried the more than 1,400 participants at the 2019 International Congress on Molecular Plant-Microbe Interactions meeting in Glasgow. This group effort resulted in a list of ten, broad-reaching, fundamental questions that influence and inform our research. Here, we introduce these Top 10 unanswered questions, giving context and a brief description of the issues. Each of these questions will be the subject of a detailed review in the coming months. We hope that this process of reflecting on what is known and unknown and identifying the themes that underlie our research will provide a framework to use going forward, giving newcomers a sense of the mystery of the big questions and inspiring new avenues and novel insights.[Formula: see text] Copyright © 2020 The Author(s). This is an open access article distributed under the CC BY 4.0 International license.
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Affiliation(s)
- Jeanne M Harris
- Department of Plant Biology, University of Vermont, Burlington, VT 05405, U.S.A
| | - Peter Balint-Kurti
- USDA-ARS, Plant Science Research Unit, Raleigh NC, and Dept. of Entomology and Plant Pathology, NC State University, Raleigh, NC 27695-7613, U.S.A
| | - Jacqueline C Bede
- Department of Plant Science, McGill University, Ste-Anne-de-Bellevue, Quebec H9X 3V9, Canada
| | - Brad Day
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, U.S.A
| | - Scott Gold
- Plant Pathology Department, University of Georgia, USDA-ARS, Athens, GA 30605-2720, U.S.A
| | - Erica M Goss
- Plant Pathology Department and Emerging Pathogens Institute, University of Florida, Gainesville, FL 32611, U.S.A
| | - Laura J Grenville-Briggs
- Department of Plant Protection Biology, Swedish University of Agricultural Sciences, SE-230 53 Alnarp, Sweden
| | - Kathryn M Jones
- Department of Biological Science, Florida State University, Tallahassee, FL 32306, U.S.A
| | - Aiming Wang
- London Research and Development Centre, Agriculture and Agri-Food Canada, London, ON N5V 4T3, Canada
| | - Yuanchao Wang
- Department of Plant Pathology, Nanjing Agricultural University, and Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing 210095, China
| | - Raka M Mitra
- Biology Department, Carleton College, Northfield, MN 55057, U.S.A
| | - Kee Hoon Sohn
- Department of Life Sciences, Pohang University of Science and Technology and School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang 37673, Korea
| | - Maria Elena Alvarez
- Centro de Investigaciones en Química Biológica de Córdoba, CIQUIBIC, CONICET, Departamento de Química Biológica Ranwel Caputto, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Córdoba X5000HUA, Argentina
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26
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Boevink PC, Birch PRJ, Turnbull D, Whisson SC. Devastating intimacy: the cell biology of plant-Phytophthora interactions. THE NEW PHYTOLOGIST 2020; 228:445-458. [PMID: 32394464 PMCID: PMC7540312 DOI: 10.1111/nph.16650] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2020] [Accepted: 04/15/2020] [Indexed: 05/07/2023]
Abstract
An understanding of the cell biology underlying the burgeoning molecular genetic and genomic knowledge of oomycete pathogenicity is essential to gain the full context of how these pathogens cause disease on plants. An intense research focus on secreted Phytophthora effector proteins, especially those containing a conserved N-terminal RXLR motif, has meant that most cell biological studies into Phytophthora diseases have focussed on the effectors and their host target proteins. While these effector studies have provided novel insights into effector secretion and host defence mechanisms, there remain many unanswered questions about fundamental processes involved in spore biology, host penetration and haustorium formation and function.
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Affiliation(s)
- Petra C. Boevink
- Cell and Molecular SciencesJames Hutton InstituteErrol RoadInvergowrieDundeeDD2 5DAUK
| | - Paul R. J. Birch
- Cell and Molecular SciencesJames Hutton InstituteErrol RoadInvergowrieDundeeDD2 5DAUK
- Division of Plant SciencesUniversity of DundeeErrol RoadInvergowrieDundeeDD2 5DAUK
| | - Dionne Turnbull
- Division of Plant SciencesUniversity of DundeeErrol RoadInvergowrieDundeeDD2 5DAUK
| | - Stephen C. Whisson
- Cell and Molecular SciencesJames Hutton InstituteErrol RoadInvergowrieDundeeDD2 5DAUK
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27
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Abstract
Most genomes within the species complex of Fusarium oxysporum are organized into two compartments: the core chromosomes (CCs) and accessory chromosomes (ACs). As opposed to CCs, which are conserved and vertically transmitted to carry out essential housekeeping functions, lineage- or strain-specific ACs are believed to be initially horizontally acquired through unclear mechanisms. These two genomic compartments are different in terms of gene density, the distribution of transposable elements, and epigenetic markers. Although common in eukaryotes, the functional importance of ACs is uniquely emphasized among fungal species, specifically in relationship to fungal pathogenicity and their adaptation to diverse hosts. With a focus on the cross-kingdom fungal pathogen F. oxysporum, this review provides a summary of the differences between CCs and ACs based on current knowledge of gene functions, genome structures, and epigenetic signatures, and explores the transcriptional crosstalk between the core and accessory genomes.
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28
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Ono E, Mise K, Takano Y. RLP23 is required for Arabidopsis immunity against the grey mould pathogen Botrytis cinerea. Sci Rep 2020; 10:13798. [PMID: 32796867 PMCID: PMC7428006 DOI: 10.1038/s41598-020-70485-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 07/30/2020] [Indexed: 01/09/2023] Open
Abstract
Necrosis- and ethylene-inducing-like proteins (NLPs) are secreted by fungi, oomycetes and bacteria. Conserved nlp peptides derived from NLPs are recognized as pathogen-associated molecular patterns (PAMPs), leading to PAMP-triggered immune responses. RLP23 is the receptor of the nlp peptides in Arabidopsis thaliana; however, its actual contribution to plant immunity is unclear. Here, we report that RLP23 is required for Arabidopsis immunity against the necrotrophic fungal pathogen Botrytis cinerea. Arabidopsis rlp23 mutants exhibited enhanced susceptibility to B. cinerea compared with the wild-type plants. Notably, microscopic observation of the B. cinerea infection behaviour indicated the involvement of RLP23 in pre-invasive resistance to the pathogen. B. cinerea carried two NLP genes, BcNEP1 and BcNEP2; BcNEP1 was expressed preferentially before/during invasion into Arabidopsis, whereas BcNEP2 was expressed at the late phase of infection. Importantly, the nlp peptides derived from both BcNEP1 and BcNEP2 induced the production of reactive oxygen species in an RLP23-dependent manner. In contrast, another necrotrophic fungus Alternaria brassicicola did not express the NLP gene in the early infection phase and exhibited no enhanced virulence in the rlp23 mutants. Collectively, these results strongly suggest that RLP23 contributes to Arabidopsis pre-invasive resistance to B. cinerea via NLP recognition at the early infection phase.
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Affiliation(s)
- Erika Ono
- Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Kazuyuki Mise
- Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan
| | - Yoshitaka Takano
- Graduate School of Agriculture, Kyoto University, Kyoto, 606-8502, Japan.
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29
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Nazar Pour F, Cobos R, Rubio Coque JJ, Serôdio J, Alves A, Félix C, Ferreira V, Esteves AC, Duarte AS. Toxicity of Recombinant Necrosis and Ethylene-Inducing Proteins (NLPs) from Neofusicoccum parvum. Toxins (Basel) 2020; 12:E235. [PMID: 32272814 PMCID: PMC7232490 DOI: 10.3390/toxins12040235] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Revised: 03/28/2020] [Accepted: 04/01/2020] [Indexed: 11/18/2022] Open
Abstract
Neofusicoccum parvum is a fungal pathogen associated with a wide range of plant hosts. Despite being widely studied, the molecular mechanism of infection of N. parvum is still far from being understood. Analysis of N. parvum genome lead to the identification of six putative genes encoding necrosis and ethylene-inducing proteins (NLPs). The sequence of NLPs genes (NprvNep 1-6) were analyzed and four of the six NLP genes were successfully cloned, expressed in E. coli and purified by affinity chromatography. Pure recombinant proteins were characterized according to their phytotoxic and cytotoxic effects to tomato leaves and to mammalian Vero cells, respectively. These assays revealed that all NprvNeps tested are cytotoxic to Vero cells and also induce cell death in tomato leaves. NprvNep2 was the most toxic to Vero cells, followed by NprvNep1 and 3. NprvNep4 induced weaker, but, nevertheless, still significant toxic effects to Vero cells. A similar trend of toxicity was observed in tomato leaves: the most toxic was NprvNep 2 and the least toxic NprvNep 4. This study describes for the first time an overview of the NLP gene family of N. parvum and provides additional insights into its pathogenicity mechanism.
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Affiliation(s)
- Forough Nazar Pour
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; (F.N.P.); (J.S.); (A.A.); (C.F.); (V.F.)
| | - Rebeca Cobos
- Instituto de Investigación de la Viña y el Vino (IIVV), Escuela de Ingeniería Agraria, Universidad de León, Avda. Portugal, 41, 24009 León, Spain; (R.C.); (J.J.R.C.)
| | - Juan José Rubio Coque
- Instituto de Investigación de la Viña y el Vino (IIVV), Escuela de Ingeniería Agraria, Universidad de León, Avda. Portugal, 41, 24009 León, Spain; (R.C.); (J.J.R.C.)
| | - João Serôdio
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; (F.N.P.); (J.S.); (A.A.); (C.F.); (V.F.)
| | - Artur Alves
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; (F.N.P.); (J.S.); (A.A.); (C.F.); (V.F.)
| | - Carina Félix
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; (F.N.P.); (J.S.); (A.A.); (C.F.); (V.F.)
| | - Vanessa Ferreira
- CESAM-Centre for Environmental and Marine Studies, Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; (F.N.P.); (J.S.); (A.A.); (C.F.); (V.F.)
| | - Ana Cristina Esteves
- Faculty of Dental Medicine, Center for Interdisciplinary Research in Health, Universidade Católica Portuguesa, Estrada da Circunvalação, 3504-505 Viseu, Spain;
| | - Ana Sofia Duarte
- Faculty of Dental Medicine, Center for Interdisciplinary Research in Health, Universidade Católica Portuguesa, Estrada da Circunvalação, 3504-505 Viseu, Spain;
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30
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Ochola S, Huang J, Ali H, Shu H, Shen D, Qiu M, Wang L, Li X, Chen H, Kange A, Qutob D, Dong S. Editing of an effector gene promoter sequence impacts plant-Phytophthora interaction. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2020; 62:378-392. [PMID: 31691466 DOI: 10.1111/jipb.12883] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 10/31/2019] [Indexed: 06/10/2023]
Abstract
Pathogen avirulence (Avr) effectors interplay with corresponding plant resistance (R) proteins and activate robust plant immune responses. Although the expression pattern of Avr genes has been tied to their functions for a long time, it is still not clear how Avr gene expression patterns impact plant-microbe interactions. Here, we selected PsAvr3b, which shows a typical effector gene expression pattern from a soybean root pathogen Phytophthora sojae. To modulate gene expression, we engineered PsAvr3b promoter sequences by in situ substitution with promoter sequences from Actin (constitutive expression), PsXEG1 (early expression), and PsNLP1 (later expression) using the CRISPR/Cas9. PsAvr3b driven by different promoters resulted in distinct expression levels across all the tested infection time points. Importantly, those mutants with low PsAvr3b expression successfully colonized soybean plants carrying the cognate R gene Rps3b. To dissect the difference in plant responses to the PsAvr3b expression level, we conducted RNA-sequencing of different infection samples at 24 h postinfection and found soybean immune genes, including a few previously unknown genes that are associated with resistance. Our study highlights that fine-tuning in Avr gene expression impacts the compatibility of plant disease and provides clues to improve crop resistance in disease control management.
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Affiliation(s)
- Sylvans Ochola
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jie Huang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, 210095, China
| | - Haider Ali
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Haidong Shu
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Danyu Shen
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, 210095, China
| | - Min Qiu
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Liyuan Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xi Li
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Han Chen
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Alex Kange
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Dinah Qutob
- Department of Math and Science, Walsh University, North Canton, OH, 44720, USA
| | - Suomeng Dong
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, 210095, China
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Schumacher S, Grosser K, Voegele RT, Kassemeyer HH, Fuchs R. Identification and Characterization of Nep1-Like Proteins From the Grapevine Downy Mildew Pathogen Plasmopara viticola. FRONTIERS IN PLANT SCIENCE 2020; 11:65. [PMID: 32117400 PMCID: PMC7031652 DOI: 10.3389/fpls.2020.00065] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 01/16/2020] [Indexed: 06/10/2023]
Abstract
The obligate biotrophic oomycete Plasmopara viticola causes tremendous problems in viticulture by evoking grapevine downy mildew. P. viticola, like other plant pathogens, achieves infection by suppression of plant innate immunity by secretion of effector molecules into its host plant. An ever-expanding family of proteins with effector-like characteristics is formed by the "Necrosis and Ethylene inducing peptide 1 (Nep1)-like proteins" (NLPs). NLPs can be divided into two groups by their ability to induce necrosis. While cytotoxic NLPs may act as virulence factors for a necrotrophic or hemibiotrophic plant pathogen, the role of non-cytotoxic NLPs is so far unknown. In this study, we identified eight independent NLPs in P. viticola and selected three for functional analysis. While one was identified as a putative pseudo gene, two contain all so far described critical key elements for necrosis formation except for an N-terminal signal peptide. Further characterization revealed that none of the putative necrosis elicitors was able to actually induce necrosis, neither in several susceptible or resistant Vitis species nor in the dicot model plant Nicotiana benthamiana. This inability exists independently of the presence or absence of a signal peptide. However, any possible mechanism for the suppression of the ability to induce necrosis in planta was not detected. Interestingly, expression analysis of the presumed pseudo gene revealed remarkable differences between pure sporangia solution and sporangia in the presence of leaf material. To our knowledge, this is the first report of this kind of regulation that suggests an important function of so far nonfunctional "pseudo" NLP genes during the first hours of infection.
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Affiliation(s)
- Stefan Schumacher
- Section of Phytopathology and Diagnosis, Department of Biology, State Institute for Viticulture and Enology, Freiburg, Germany
| | - Katrin Grosser
- Section of Phytopathology and Diagnosis, Department of Biology, State Institute for Viticulture and Enology, Freiburg, Germany
| | - Ralf Thomas Voegele
- Department of Phytopathology, Institute of Phytomedicine (360), Faculty of Agricultural Sciences, University of Hohenheim, Stuttgart, Germany
| | - Hanns-Heinz Kassemeyer
- Section of Phytopathology and Diagnosis, Department of Biology, State Institute for Viticulture and Enology, Freiburg, Germany
| | - René Fuchs
- Section of Phytopathology and Diagnosis, Department of Biology, State Institute for Viticulture and Enology, Freiburg, Germany
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Wang Y, Tyler BM, Wang Y. Defense and Counterdefense During Plant-Pathogenic Oomycete Infection. Annu Rev Microbiol 2019; 73:667-696. [DOI: 10.1146/annurev-micro-020518-120022] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Plant-pathogenic oomycetes include numerous species that are ongoing threats to agriculture and natural ecosystems. Understanding the molecular dialogs between oomycetes and plants is instrumental for sustaining effective disease control. Plants respond to oomycete infection by multiple defense actions including strengthening of physical barriers, production of antimicrobial molecules, and programmed cell death. These responses are tightly controlled and integrated via a three-layered immune system consisting of a multiplex recognition layer, a resilient signal-integration layer, and a diverse defense-action layer. Adapted oomycete pathogens utilize apoplastic and intracellular effector arsenals to counter plant immunity mechanisms within each layer, including by evasion or suppression of recognition, interference with numerous signaling components, and neutralization or suppression of defense actions. A coevolutionary arms race continually drives the emergence of new mechanisms of plant defense and oomycete counterdefense.
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Affiliation(s)
- Yan Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China;,
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China
| | - Brett M. Tyler
- Center for Genome Research and Biocomputing and Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon 97331, USA
| | - Yuanchao Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China;,
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing 210095, China
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Lenarčič T, Pirc K, Hodnik V, Albert I, Borišek J, Magistrato A, Nürnberger T, Podobnik M, Anderluh G. Molecular basis for functional diversity among microbial Nep1-like proteins. PLoS Pathog 2019; 15:e1007951. [PMID: 31479498 PMCID: PMC6743777 DOI: 10.1371/journal.ppat.1007951] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 09/13/2019] [Accepted: 06/29/2019] [Indexed: 11/18/2022] Open
Abstract
Necrosis and ethylene-inducing peptide 1 (Nep1)-like proteins (NLPs) are secreted by several phytopathogenic microorganisms. They trigger necrosis in various eudicot plants upon binding to plant sphingolipid glycosylinositol phosphorylceramides (GIPC). Interestingly, HaNLP3 from the obligate biotroph oomycete Hyaloperonospora arabidopsidis does not induce necrosis. We determined the crystal structure of HaNLP3 and showed that it adopts the NLP fold. However, the conformations of the loops surrounding the GIPC headgroup-binding cavity differ from those of cytotoxic Pythium aphanidermatum NLPPya. Essential dynamics extracted from μs-long molecular dynamics (MD) simulations reveals a limited conformational plasticity of the GIPC-binding cavity in HaNLP3 relative to toxic NLPs. This likely precludes HaNLP3 binding to GIPCs, which is the underlying reason for the lack of toxicity. This study reveals that mutations at key protein regions cause a switch between non-toxic and toxic phenotypes within the same protein scaffold. Altogether, these data provide evidence that protein flexibility is a distinguishing trait of toxic NLPs and highlight structural determinants for a potential functional diversification of non-toxic NLPs utilized by biotrophic plant pathogens.
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Affiliation(s)
- Tea Lenarčič
- Department of Molecular Biology and Nanobiotechnology, National Institute of Chemistry, Hajdrihova, Ljubljana, Slovenia
| | - Katja Pirc
- Department of Molecular Biology and Nanobiotechnology, National Institute of Chemistry, Hajdrihova, Ljubljana, Slovenia
| | - Vesna Hodnik
- Department of Molecular Biology and Nanobiotechnology, National Institute of Chemistry, Hajdrihova, Ljubljana, Slovenia
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva, Ljubljana, Slovenia
| | - Isabell Albert
- Center of Plant Molecular Biology (ZMBP), Eberhard-Karls-University Tübingen, Auf der Morgenstelle, Tübingen, Germany
| | - Jure Borišek
- CNR-IOM-Democritos at International School for Advanced Studies (SISSA), Trieste, Italy
| | - Alessandra Magistrato
- CNR-IOM-Democritos at International School for Advanced Studies (SISSA), Trieste, Italy
| | - Thorsten Nürnberger
- Center of Plant Molecular Biology (ZMBP), Eberhard-Karls-University Tübingen, Auf der Morgenstelle, Tübingen, Germany
- Department of Biochemistry, University of Johannesburg, Auckland Park, South Africa
| | - Marjetka Podobnik
- Department of Molecular Biology and Nanobiotechnology, National Institute of Chemistry, Hajdrihova, Ljubljana, Slovenia
- * E-mail: (MP); (GA)
| | - Gregor Anderluh
- Department of Molecular Biology and Nanobiotechnology, National Institute of Chemistry, Hajdrihova, Ljubljana, Slovenia
- * E-mail: (MP); (GA)
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Seidl MF, Van den Ackerveken G. Activity and Phylogenetics of the Broadly Occurring Family of Microbial Nep1-Like Proteins. ANNUAL REVIEW OF PHYTOPATHOLOGY 2019; 57:367-386. [PMID: 31283435 DOI: 10.1146/annurev-phyto-082718-100054] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Necrosis- and ethylene-inducing peptide 1 (Nep1)-like proteins (NLP) have an extremely broad taxonomic distribution; they occur in bacteria, fungi, and oomycetes. NLPs come in two forms, those that are cytotoxic to eudicot plants and those that are noncytotoxic. Cytotoxic NLPs bind to glycosyl inositol phosphoryl ceramide (GIPC) sphingolipids that are abundant in the outer leaflet of plant plasma membranes. Binding allows the NLP to become cytolytic in eudicots but not monocots. The function of noncytotoxic NLPs remains enigmatic, but the expansion of NLP genes in oomycete genomes suggests they are important. Several plant species have evolved the capacity to recognize NLPs as molecular patterns and trigger plant immunity, e.g., Arabidopsis thaliana detects nlp peptides via the receptor-like protein RLP23. In this review, we provide a historical perspective from discovery to understanding of molecular mechanisms and describe the latest developments in the NLP field to shed light on these fascinating microbial proteins.
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Affiliation(s)
- Michael F Seidl
- Laboratory of Phytopathology, Wageningen University & Research, 6708 PB Wageningen, The Netherlands
- Theoretical Biology and Bioinformatics, Department of Biology, Utrecht University, 3584 CH Utrecht, The Netherlands
| | - Guido Van den Ackerveken
- Plant-Microbe Interactions, Department of Biology, Utrecht University, 3584 CH Utrecht, The Netherlands;
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Levin E, Raphael G, Ma J, Ballester AR, Feygenberg O, Norelli J, Aly R, Gonzalez-Candelas L, Wisniewski M, Droby S. Identification and Functional Analysis of NLP-Encoding Genes from the Postharvest Pathogen Penicillium expansum. Microorganisms 2019; 7:microorganisms7060175. [PMID: 31208074 PMCID: PMC6616513 DOI: 10.3390/microorganisms7060175] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 06/03/2019] [Accepted: 06/13/2019] [Indexed: 12/25/2022] Open
Abstract
Penicillium expansum is a major postharvest pathogen that infects different fruits, mainly through injuries inflicted during harvest or subsequent handling after harvest. Several effectors were suggested to mediate pathogenicity of P. expansum in fruit tissue. Among these effectors Nep1-like proteins (NLPs), produced by various microorganisms with different lifestyles, are known for their ability to induce necrosis in dicot plants and were shown to be involved in virulence of several plant-related pathogens. This study was aimed at the identification and functional characterization of two NLP genes found in the genome of P. expansum. The genes were designated Penlp1 and Penlp2 and were found to code type1 and type3 NLP respectively. Necrosis-inducing activity of the two proteins was demonstrated by transient expression in Nicotiana benthamiana leaves. While Penlp1 expression was induced during apple infection and in liquid culture, the highest level of Penlp2 expression was found in ungerminated spores. Deletion of Penlp1, but not Penlp2, resulted in reduced virulence on apples manifested by reduced rate of lesion development (disease severity).
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Affiliation(s)
- Elena Levin
- Department of Postharvest Science, Agricultural Research Organization, the Volcani Center, Rishon LeZion 7505101, Israel.
| | - Ginat Raphael
- Department of Postharvest Science, Agricultural Research Organization, the Volcani Center, Rishon LeZion 7505101, Israel.
| | - Jing Ma
- Appalachian Fruit Research Station, Agricultural Research Service, United States Department of Agriculture, Wiltshire Road, Kearneysville, WV 25430, USA.
| | - Ana-Rosa Ballester
- Instituto de Agroquímica y Tecnología de Alimentos (IATA-CSIC), Calle Catedrático Agustin Escardino 7, Paterna 46980, Valencia 46980, Spain.
| | - Oleg Feygenberg
- Department of Postharvest Science, Agricultural Research Organization, the Volcani Center, Rishon LeZion 7505101, Israel.
| | - John Norelli
- Appalachian Fruit Research Station, Agricultural Research Service, United States Department of Agriculture, Wiltshire Road, Kearneysville, WV 25430, USA.
| | - Radi Aly
- Department of Plant Pathology and Weed Research, ARO, the Volcani Center, Newe-Yaar Research Center, Ramat Yeshai 30095, Israel.
| | - Luis Gonzalez-Candelas
- Instituto de Agroquímica y Tecnología de Alimentos (IATA-CSIC), Calle Catedrático Agustin Escardino 7, Paterna 46980, Valencia 46980, Spain.
| | - Michael Wisniewski
- Appalachian Fruit Research Station, Agricultural Research Service, United States Department of Agriculture, Wiltshire Road, Kearneysville, WV 25430, USA.
| | - Samir Droby
- Department of Postharvest Science, Agricultural Research Organization, the Volcani Center, Rishon LeZion 7505101, Israel.
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Toljamo A, Blande D, Munawar M, Kärenlampi SO, Kokko H. Expression of the GAF Sensor, Carbohydrate-Active Enzymes, Elicitins, and RXLRs Differs Markedly Between Two Phytophthora cactorum Isolates. PHYTOPATHOLOGY 2019; 109:726-735. [PMID: 30412010 DOI: 10.1094/phyto-04-18-0136-r] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The phytopathogen Phytophthora cactorum infects economically important herbaceous and woody plant species. P. cactorum isolates differ in host specificity; for example, strawberry crown rot is often caused by a specialized pathotype. Here we compared the transcriptomes of two P. cactorum isolates that differ in their virulence to garden strawberry (Pc407: high virulence; Pc440: low virulence). De novo transcriptome assembly and clustering of contigs resulted in 19,372 gene clusters. Two days after inoculation of Fragaria vesca roots, 3,995 genes were differently expressed between the P. cactorum isolates. One of the genes that were highly expressed only in Pc407 encodes a GAF sensor protein potentially involved in membrane trafficking processes. Two days after inoculation, elicitins were highly expressed in Pc407 and lipid catabolism appeared to be more active than in Pc440. Of the carbohydrate-active enzymes, those that degrade pectin were often more highly expressed in Pc440, whereas members of glycosyl hydrolase family 1, potentially involved in the metabolism of glycosylated secondary metabolites, were more highly expressed in Pc407 at the time point studied. Differences were also observed among the RXLR effectors: Pc407 appears to rely on a smaller set of key RXLR effectors, whereas Pc440 expresses a greater number of RXLRs. This study is the first step toward improving understanding of the molecular basis of differences in the virulence of P. cactorum isolates. Identification of the key effectors is important, as it enables effector-assisted breeding strategies toward crown rot-resistant strawberry cultivars.
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Affiliation(s)
- Anna Toljamo
- Department of Environmental and Biological Sciences, University of Eastern Finland, FI-70211 Kuopio, Finland
| | - Daniel Blande
- Department of Environmental and Biological Sciences, University of Eastern Finland, FI-70211 Kuopio, Finland
| | - Mustafa Munawar
- Department of Environmental and Biological Sciences, University of Eastern Finland, FI-70211 Kuopio, Finland
| | - Sirpa O Kärenlampi
- Department of Environmental and Biological Sciences, University of Eastern Finland, FI-70211 Kuopio, Finland
| | - Harri Kokko
- Department of Environmental and Biological Sciences, University of Eastern Finland, FI-70211 Kuopio, Finland
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Nie J, Yin Z, Li Z, Wu Y, Huang L. A small cysteine-rich protein from two kingdoms of microbes is recognized as a novel pathogen-associated molecular pattern. THE NEW PHYTOLOGIST 2019; 222:995-1011. [PMID: 30537041 DOI: 10.1111/nph.15631] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Accepted: 12/01/2018] [Indexed: 05/24/2023]
Abstract
Pathogen-associated molecular patterns (PAMPs) are conserved molecules that are crucial for normal life cycle of microorganisms. However, the diversity of microbial PAMPs is little known. During screening of cell-death-inducing factors from the necrotrophic fungus Valsa mali, we identified a novel PAMP VmE02 that is widely spread in oomycetes and fungi. Agrobacterium tumefaciens-mediated transient expression or infiltration of recombinant protein produced by Escherichia coli was performed to assay elicitor activity of the proteins tested. Virus-induced gene silencing in Nicotiana benthamiana was used to determine the components involved in VmE02-triggered cell death. The role of VmE02 in virulence and conidiation of V. mali were characterized by gene deletion and complementation. We found that VmE02, together with some of its homologues from both oomycete and fungal species, exhibited cell-death-inducing activity in N. benthamiana. VmE02-triggered cell death was shown to be dependent on BRI1-ASSOCIATED KINASE-1, SUPPRESSOR OF BIR1-1, HSP90 and SGT1 in N. benthamiana. Deletion of VmE02 in V. mali greatly attenuated pathogen conidiation but not virulence, and treatment of N. benthamiana with VmE02 enhances plant resistance to Sclerotinia sclerotiorum and Phytophthora capsici. We conclude that VmE02 is a novel cross-kingdom PAMP produced by several fungi and oomycetes.
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Affiliation(s)
- Jiajun Nie
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Zhiyuan Yin
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Zhengpeng Li
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Yuxing Wu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Lili Huang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
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38
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The repertoire of effector candidates in Colletotrichum lindemuthianum reveals important information about Colletotrichum genus lifestyle. Appl Microbiol Biotechnol 2019; 103:2295-2309. [DOI: 10.1007/s00253-019-09639-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 01/04/2019] [Accepted: 01/08/2019] [Indexed: 01/04/2023]
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Cobos R, Calvo-Peña C, Álvarez-Pérez JM, Ibáñez A, Diez-Galán A, González-García S, García-Angulo P, Acebes JL, Coque JJR. Necrotic and Cytolytic Activity on Grapevine Leaves Produced by Nep1-Like Proteins of Diplodia seriata. FRONTIERS IN PLANT SCIENCE 2019; 10:1282. [PMID: 31749815 PMCID: PMC6843023 DOI: 10.3389/fpls.2019.01282] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 09/13/2019] [Indexed: 05/22/2023]
Abstract
Many phytopathogenic fungi produce necrosis and ethylene inducing peptide 1 (Nep1-like proteins or NLP) that trigger leaf necrosis and the activation of defense mechanisms. These proteins have been widely studied in plant pathogens as Moniliophthora perniciosa or Botrytis cinerea between others, but little is known about their biological roles in grapevine trunk pathogens. Advances in the sequencing of genomes of several fungi involved in grapevine trunk diseases have revealed that these proteins are present in several copies in their genomes. The aim of this project was to analyze the presence of genes encoding NLP proteins in the Diplodia seriata genome and to characterize their putative role as virulence factors associated to grapevine trunk diseases. In this study, we characterized four NLPs from Diplodia seriata. All proteins showed highly similar amino acid sequences and contained the characteristic peptide motifs of NLPs. DserNEPs slightly reduced the viability of Vitis vinifera L. cell cultures. The cytolytic activity from DserNEP1 was stronger than that from DserNEP2, even at low concentrations. Purified DserNEPs also produced necrosis in leaves when they were inoculated into micropropagules of V. vinifera L. This is the first record of Nep1-like proteins from a fungus associated with grapevine trunk diseases and also from a member of the Botryosphaeriaceae family.
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Affiliation(s)
- Rebeca Cobos
- Instituto de Investigación de la Viña y el Vino, Universidad de León, León, Spain
- RGA-bioinvestigación S.L., León, Spain
- *Correspondence: Rebeca Cobos, ; Juan José Rubio Coque,
| | - Carla Calvo-Peña
- Instituto de Investigación de la Viña y el Vino, Universidad de León, León, Spain
| | | | - Ana Ibáñez
- Instituto de Investigación de la Viña y el Vino, Universidad de León, León, Spain
| | | | | | | | - Jose Luis Acebes
- Instituto de Investigación de la Viña y el Vino, Universidad de León, León, Spain
| | - Juan José R. Coque
- Instituto de Investigación de la Viña y el Vino, Universidad de León, León, Spain
- RGA-bioinvestigación S.L., León, Spain
- *Correspondence: Rebeca Cobos, ; Juan José Rubio Coque,
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Huang J, Chen L, Lu X, Peng Q, Zhang Y, Yang J, Zhang BY, Yang B, Waletich JR, Yin W, Zheng X, Wang Y, Dong S. Natural allelic variations provide insights into host adaptation of Phytophthora avirulence effector PsAvr3c. THE NEW PHYTOLOGIST 2019; 221:1010-1022. [PMID: 30169906 DOI: 10.1111/nph.15414] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 07/26/2018] [Indexed: 06/08/2023]
Abstract
Filamentous pathogens, such as fungi and oomycetes, secrete avirulence (AVR) effectors that trigger plant immune responses and provide striking examples of host adaptations. Avr effector genes display different types of allelic variations, including deletions, epigenetic silencing and sequence polymorphisms, to avoid detection. However, how effector sequence polymorphisms enable pathogens to dodge host immune surveillance remains largely unknown. PsAvr3c is a Phytophthora AVR gene that is recognized by soybean carrying Rps3c. PsAvr3c natural alleles display a rich diversity of single nucleotide polymorphisms in field isolates. We combined both site-directed mutagenesis and population sequence surveys to identify a serine substitution of glycine at position 174 in PsAvr3c that resulted in evasion of Rps3c-mediated soybean immunity. The S174G substitution did not affect the nuclear localization of PsAvr3c in planta, which is required to activate Rps3c, but it significantly impaired the binding affinity of PsAvr3c with a previously identified spliceosome-associated protein GmSKRPs. Silencing GmSKRPs specifically impaired PsAvr3c-triggered cell death in Rps3c soybean. This study uncovered a plant Phytophthora pathogen that adapted to a resistant plant through a key amino acid mutation and subsequently reduced the binding affinity with a plant immune regulator to evade host resistance.
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Affiliation(s)
- Jie Huang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, 210095, China
| | - Ling Chen
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xinyu Lu
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Qian Peng
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Ying Zhang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jin Yang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Bai Yu Zhang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Bo Yang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Justin Reed Waletich
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Weixiao Yin
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xiaobo Zheng
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, 210095, China
| | - Yuanchao Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, 210095, China
| | - Suomeng Dong
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of Education, Nanjing, 210095, China
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41
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Wang Y, Wang Y. Phytophthora sojae effectors orchestrate warfare with host immunity. Curr Opin Microbiol 2018; 46:7-13. [PMID: 29454192 DOI: 10.1016/j.mib.2018.01.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 01/11/2018] [Indexed: 11/26/2022]
Abstract
Phytophthora sojae is one of the most damaging plant pathogens of soybean. To aid establishment of a compatible interaction with its host, P. sojae deploys many secreted effectors. These effectors act either in the apoplastic space to cope with hostile conditions or inside of host cells to reprogram host physiology favoring pathogen growth. Effectors have been used as molecular probes, which revealed in Phytophthora that effectors execute their virulence function via manipulating host targets. In addition, recent studies have discovered 'pseudo-effectors' in Phytophthora that act as decoys to shield virulence effectors from host defense, a new paradigm in plant-pathogen interactions.
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Affiliation(s)
- Yan Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China; Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing 210095, China
| | - Yuanchao Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing 210095, China; Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing 210095, China.
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Chen H, Shu H, Wang L, Zhang F, Li X, Ochola SO, Mao F, Ma H, Ye W, Gu T, Jiang L, Wu Y, Wang Y, Kamoun S, Dong S. Phytophthora methylomes are modulated by 6mA methyltransferases and associated with adaptive genome regions. Genome Biol 2018; 19:181. [PMID: 30382931 PMCID: PMC6211444 DOI: 10.1186/s13059-018-1564-4] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 10/16/2018] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Filamentous plant pathogen genomes often display a bipartite architecture with gene-sparse, repeat-rich compartments serving as a cradle for adaptive evolution. The extent to which this two-speed genome architecture is associated with genome-wide DNA modifications is unknown. RESULTS We show that the oomycetes Phytophthora infestans and Phytophthora sojae possess functional adenine N6-methylation (6mA) methyltransferases that modulate patterns of 6mA marks across the genome. In contrast, 5-methylcytosine could not be detected in these species. Methylated DNA IP sequencing (MeDIP-seq) of each species reveals 6mA is depleted around the transcription start sites (TSSs) and is associated with lowly expressed genes, particularly transposable elements. Genes occupying the gene-sparse regions have higher levels of 6mA in both genomes, possibly implicating the methylome in adaptive evolution. All six putative adenine methyltransferases from P. infestans and P. sojae, except PsDAMT2, display robust enzymatic activities. Surprisingly, single knockouts in P. sojae significantly reduce in vivo 6mA levels, indicating that the three enzymes are not fully redundant. MeDIP-seq of the psdamt3 mutant reveals uneven 6mA methylation reduction across genes, suggesting that PsDAMT3 may have a preference for gene body methylation after the TSS. Furthermore, transposable elements such as DNA elements are more active in the psdamt3 mutant. A large number of genes, particularly those from the adaptive genomic compartment, are differentially expressed. CONCLUSIONS Our findings provide evidence that 6mA modification is potentially an epigenetic mark in Phytophthora genomes, and complex patterns of 6mA methylation may be associated with adaptive evolution in these important plant pathogens.
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Affiliation(s)
- Han Chen
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
| | - Haidong Shu
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
| | - Liyuan Wang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
| | - Fan Zhang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xi Li
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
| | | | - Fei Mao
- National Key Laboratory for Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 210095, China
| | - Hongyu Ma
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
| | - Wenwu Ye
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
| | - Tingting Gu
- College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China
| | - Lubin Jiang
- Institute Pasteur of Shanghai, Chinese Academy of Sciences, Shanghai, 200031, China
| | - Yufeng Wu
- National Key Laboratory for Crop Genetics and Germplasm Enhancement, Nanjing Agricultural University, Nanjing, 210095, China
| | - Yuanchao Wang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
| | - Sophien Kamoun
- The Sainsbury Laboratory, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Suomeng Dong
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China.
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Wang Y, Ye W, Wang Y. Genome-wide identification of long non-coding RNAs suggests a potential association with effector gene transcription in Phytophthora sojae. MOLECULAR PLANT PATHOLOGY 2018; 19:2177-2186. [PMID: 29665235 PMCID: PMC6638102 DOI: 10.1111/mpp.12692] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 03/14/2018] [Accepted: 04/12/2018] [Indexed: 05/08/2023]
Abstract
Numerous long non-coding RNAs (lncRNAs) identified and characterized in mammals, plants and fungi have been found to play critical regulatory roles in biological processes. However, little is known about the role of lncRNAs in oomycete plant pathogens, which cause devastating damage to the economy and ecosystems. We used strand-specific RNA sequencing (RNA-seq) to generate a computational pipeline to identify lncRNAs in Phytophthora sojae, a model oomycete plant pathogen. In total, 940 lncRNAs with 1010 isoforms were identified from RNA-seq data obtained from four representative stages of P. sojae. The lncRNAs had shorter transcript lengths, longer exon lengths, fewer numbers of exons, lower GC content and higher minimum free energy values compared with protein-coding genes. lncRNAs in P. sojae exhibited low sequence conservation amongst oomycetes and P. sojae isolates. Transcriptional data indicated that P. sojae lncRNAs tended to be transcribed in a stage-specific manner; representative lncRNAs were validated by semi-quantitative reverse transcription-polymerase chain reaction. Phytophthora sojae lncRNAs were concentrated in gene-sparse regions, and lncRNAs were associated with secreted protein and effector coding genes. The neighbouring genes of lncRNAs encoded various effector family members, and RNA-seq data revealed a correlation between the transcription level of lncRNAs and their neighbouring genes. Our results provide the first comprehensive identification of lncRNAs in oomycetes and suggest a potential association between lncRNAs and effector genes.
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Affiliation(s)
- Yang Wang
- Department of Plant PathologyNanjing Agricultural UniversityNanjingJiangsu 210095China
- The Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of EducationNanjingJiangsu 210095China
| | - Wenwu Ye
- Department of Plant PathologyNanjing Agricultural UniversityNanjingJiangsu 210095China
- The Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of EducationNanjingJiangsu 210095China
| | - Yuanchao Wang
- Department of Plant PathologyNanjing Agricultural UniversityNanjingJiangsu 210095China
- The Key Laboratory of Integrated Management of Crop Diseases and Pests, Ministry of EducationNanjingJiangsu 210095China
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Liu P, Wei M, Zhang J, Wang R, Li B, Chen Q, Weng Q. Changes in mycelia growth, sporulation, and virulence of Phytophthora capsici when challenged by heavy metals (Cu 2+, Cr 2+ and Hg 2+) under acid pH stress. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 235:372-380. [PMID: 29306805 DOI: 10.1016/j.envpol.2017.12.100] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 12/15/2017] [Accepted: 12/25/2017] [Indexed: 06/07/2023]
Abstract
Phytophthora capsici, an economically devastating oomycete pathogen, causes devastating disease epidemics on a wide range of vegetable plants and pose a grave threat to global vegetables production. Heavy metals and acid pH are newly co-occurring stresses to soil micro-organisms, but what can be expected for mycelia growth and virulence and how they injure the oomycetes (especially P. capsici) remains unknown. Here, the effects of different heavy metals (Cu2+, Cr2+, and Hg2+) on mycelia growth and virulence were investigated at different pHs (4.0 vs. 7.0) and the plausible molecular and physiological mechanisms were analyzed. In the present study, we compared the effective inhibition of different heavy metals (Cu2+, Cr2+, and Hg2+) and acid pH on a previously genome sequenced P. capsici virulent strain LT1534. Both stress factors independently affected its mycelia growth and sporulation. Next, we investigated whether ROS participated in the pH-inhibited mycelial growth, finding that the ROS scavenger, catalase (CAT), significantly inhibited the acid pH-induced ROS in mycelia. Additionally, because MAPK specially transmits different stress responsive signals in environment into cells, we employed CAT and a p38-MAPK pathway inhibitor to investigate ROS and p38-MAPK roles in heavy metal-inhibited mycelia growth at different pHs (4.0 vs. 7.0), finding that they significantly inhibited growth. Furthermore, ROS and p38-MAPK influenced the heavy metal-induced TBARS content, total antioxidant capacity (TAC), and CAT activity at different pHs, and also reduced the expression of infection-related laccases (PcLAC2) and an effector-related protein (PcNLP14). We propose that acid pH stress accelerates how heavy metals inhibit mycelium growth, sporulation, and virulence change in P. capsici, and posit that ROS and p38-MAPK function to regulate the molecular and physiological mechanisms underlying this toxicity. Although these stresses induce molecular and physiological challenges to oomycetes, much remains to be known the mechanisms dedicated to resolve these environmental stresses.
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Affiliation(s)
- Peiqing Liu
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, China.
| | - Mengyao Wei
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, China
| | - Jinzhu Zhang
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, China
| | - Rongbo Wang
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, China
| | - Benjin Li
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, China
| | - Qinghe Chen
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, China
| | - Qiyong Weng
- Fujian Key Laboratory for Monitoring and Integrated Management of Crop Pests, Institute of Plant Protection, Fujian Academy of Agricultural Sciences, Fuzhou, 350003, China
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Chen XR, Huang SX, Zhang Y, Sheng GL, Li YP, Zhu F. Identification and functional analysis of the NLP-encoding genes from the phytopathogenic oomycete Phytophthora capsici. Mol Genet Genomics 2018; 293:931-943. [PMID: 29572661 DOI: 10.1007/s00438-018-1432-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 03/21/2018] [Indexed: 10/17/2022]
Abstract
Phytophthora capsici is a hemibiotrophic, phytopathogenic oomycete that infects a wide range of crops, resulting in significant economic losses worldwide. By means of a diverse arsenal of secreted effector proteins, hemibiotrophic pathogens may manipulate plant cell death to establish a successful infection and colonization. In this study, we described the analysis of the gene family encoding necrosis- and ethylene-inducing peptide 1 (Nep1)-like proteins (NLPs) in P. capsici, and identified 39 real NLP genes and 26 NLP pseudogenes. Out of the 65 predicted NLP genes, 48 occur in groups with two or more genes, whereas the remainder appears to be singletons distributed randomly among the genome. Phylogenetic analysis of the 39 real NLPs delineated three groups. Key residues/motif important for the effector activities are degenerated in most NLPs, including the nlp24 peptide consisting of the conserved region I (11-aa immunogenic part) and conserved region II (the heptapeptide GHRHDWE motif) that is important for phytotoxic activity. Transcriptional profiling of eight selected NLP genes indicated that they were differentially expressed during the developmental and plant infection phases of P. capsici. Functional analysis of ten cloned NLPs demonstrated that Pc11951, Pc107869, Pc109174 and Pc118548 were capable of inducing cell death in the Solanaceae, including Nicotiana benthamiana and hot pepper. This study provides an overview of the P. capsici NLP gene family, laying a foundation for further elucidating the pathogenicity mechanism of this devastating pathogen.
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Affiliation(s)
- Xiao-Ren Chen
- College of Horticulture and Plant Protection, Yangzhou University, No. 48 Wenhui Eastern Road, Yangzhou, 225009, Jiangsu, China.
| | - Shen-Xin Huang
- College of Horticulture and Plant Protection, Yangzhou University, No. 48 Wenhui Eastern Road, Yangzhou, 225009, Jiangsu, China
| | - Ye Zhang
- College of Horticulture and Plant Protection, Yangzhou University, No. 48 Wenhui Eastern Road, Yangzhou, 225009, Jiangsu, China
| | - Gui-Lin Sheng
- College of Horticulture and Plant Protection, Yangzhou University, No. 48 Wenhui Eastern Road, Yangzhou, 225009, Jiangsu, China
| | - Yan-Peng Li
- College of Horticulture and Plant Protection, Yangzhou University, No. 48 Wenhui Eastern Road, Yangzhou, 225009, Jiangsu, China
| | - Feng Zhu
- College of Horticulture and Plant Protection, Yangzhou University, No. 48 Wenhui Eastern Road, Yangzhou, 225009, Jiangsu, China
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Azmi NSA, Singkaravanit-Ogawa S, Ikeda K, Kitakura S, Inoue Y, Narusaka Y, Shirasu K, Kaido M, Mise K, Takano Y. Inappropriate Expression of an NLP Effector in Colletotrichum orbiculare Impairs Infection on Cucurbitaceae Cultivars via Plant Recognition of the C-Terminal Region. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2018; 31:101-111. [PMID: 29059009 DOI: 10.1094/mpmi-04-17-0085-fi] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The hemibiotrophic pathogen Colletotrichum orbiculare preferentially expresses a necrosis and ethylene-inducing peptide 1 (Nep1)-like protein named NLP1 during the switch to necrotrophy. Here, we report that the constitutive expression of NLP1 in C. orbiculare blocks pathogen infection in multiple Cucurbitaceae cultivars via their enhanced defense responses. NLP1 has a cytotoxic activity that induces cell death in Nicotiana benthamiana. However, C. orbiculare transgenic lines constitutively expressing a mutant NLP1 lacking the cytotoxic activity still failed to infect cucumber, indicating no clear relationship between cytotoxic activity and the NLP1-dependent enhanced defense. NLP1 also possesses the microbe-associated molecular pattern (MAMP) sequence called nlp24, recognized by Arabidopsis thaliana at its central region, similar to NLPs of other pathogens. Surprisingly, inappropriate expression of a mutant NLP1 lacking the MAMP signature is also effective for blocking pathogen infection, uncoupling the infection block from the corresponding MAMP. Notably, the deletion analyses of NLP1 suggested that the C-terminal region of NLP1 is critical to enhance defense in cucumber. The expression of mCherry fused with the C-terminal 32 amino acids of NLP1 was enough to trigger the defense of cucurbits, revealing that the C-terminal region of the NLP1 protein is recognized by cucurbits and, then, terminates C. orbiculare infection.
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Affiliation(s)
| | | | - Kyoko Ikeda
- 1 Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Saeko Kitakura
- 1 Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Yoshihiro Inoue
- 1 Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Yoshihiro Narusaka
- 2 Research Institute for Biological Sciences Okayama, Okayama, Japan; and
| | - Ken Shirasu
- 3 RIKEN Center for Sustainable Resource Science, Yokohama, Japan
| | - Masanori Kaido
- 1 Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Kazuyuki Mise
- 1 Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Yoshitaka Takano
- 1 Graduate School of Agriculture, Kyoto University, Kyoto, Japan
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Huang J, Gu L, Zhang Y, Yan T, Kong G, Kong L, Guo B, Qiu M, Wang Y, Jing M, Xing W, Ye W, Wu Z, Zhang Z, Zheng X, Gijzen M, Wang Y, Dong S. An oomycete plant pathogen reprograms host pre-mRNA splicing to subvert immunity. Nat Commun 2017; 8:2051. [PMID: 29233978 PMCID: PMC5727057 DOI: 10.1038/s41467-017-02233-5] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 11/14/2017] [Indexed: 12/18/2022] Open
Abstract
The process of RNA splicing influences many physiological processes, including plant immunity. However, how plant parasites manipulate host RNA splicing process remains unknown. Here we demonstrate that PsAvr3c, an avirulence effector from oomycete plant pathogen Phytophthora sojae, physically binds to and stabilizes soybean serine/lysine/arginine-rich proteins GmSKRPs. The SKRPs are novel proteins that associate with a complex that contains plant spliceosome components, and are negative regulators of plant immunity. Analysis by RNA-seq data indicates that alternative splicing of pre-mRNAs from 401 soybean genes, including defense-related genes, is altered in GmSKRP1 and PsAvr3c overexpressing lines compared to control plants. Representative splicing events mediated by GmSKRP1 and PsAvr3c are tested by infection assays or by transient expression in soybean plants. Our results show that plant pathogen effectors can reprogram host pre-mRNA splicing to promote disease, and we propose that pathogens evolved such strategies to defeat host immune systems.
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Affiliation(s)
- Jie Huang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Lianfeng Gu
- Basic Forestry and Proteomics Research Center, Fujian Provincial Key Laboratory of Haixia Applied Plant Systems Biology, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - Ying Zhang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Tingxiu Yan
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Guanghui Kong
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Liang Kong
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Baodian Guo
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Shanghai Center for Plant Stress Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
| | - Min Qiu
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Yang Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Maofeng Jing
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
| | - Weiman Xing
- Shanghai Center for Plant Stress Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 201602, China
| | - Wenwu Ye
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, 210095, China
| | - Zhe Wu
- Department of Biology, South University of Science and Technology of China, Shenzhen, Guangdong, 518055, China
| | - Zhengguang Zhang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, 210095, China
| | - Xiaobo Zheng
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, 210095, China
| | - Mark Gijzen
- Agriculture and Agri-Food Canada, London, ON, N5V 4T3, Canada
| | - Yuanchao Wang
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, 210095, China
| | - Suomeng Dong
- Department of Plant Pathology, Nanjing Agricultural University, Nanjing, 210095, China.
- Key Laboratory of Integrated Management of Crop Diseases and Pests (Ministry of Education), Nanjing, 210095, China.
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Kobayashi M, Hiraka Y, Abe A, Yaegashi H, Natsume S, Kikuchi H, Takagi H, Saitoh H, Win J, Kamoun S, Terauchi R. Genome analysis of the foxtail millet pathogen Sclerospora graminicola reveals the complex effector repertoire of graminicolous downy mildews. BMC Genomics 2017; 18:897. [PMID: 29166857 PMCID: PMC5700566 DOI: 10.1186/s12864-017-4296-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Accepted: 11/13/2017] [Indexed: 11/30/2022] Open
Abstract
Background Downy mildew, caused by the oomycete pathogen Sclerospora graminicola, is an economically important disease of Gramineae crops including foxtail millet (Setaria italica). Plants infected with S. graminicola are generally stunted and often undergo a transformation of flower organs into leaves (phyllody or witches’ broom), resulting in serious yield loss. To establish the molecular basis of downy mildew disease in foxtail millet, we carried out whole-genome sequencing and an RNA-seq analysis of S. graminicola. Results Sequence reads were generated from S. graminicola using an Illumina sequencing platform and assembled de novo into a draft genome sequence comprising approximately 360 Mbp. Of this sequence, 73% comprised repetitive elements, and a total of 16,736 genes were predicted from the RNA-seq data. The predicted genes included those encoding effector-like proteins with high sequence similarity to those previously identified in other oomycete pathogens. Genes encoding jacalin-like lectin-domain-containing secreted proteins were enriched in S. graminicola compared to other oomycetes. Of a total of 1220 genes encoding putative secreted proteins, 91 significantly changed their expression levels during the infection of plant tissues compared to the sporangia and zoospore stages of the S. graminicola lifecycle. Conclusions We established the draft genome sequence of a downy mildew pathogen that infects Gramineae plants. Based on this sequence and our transcriptome analysis, we generated a catalog of in planta-induced candidate effector genes, providing a solid foundation from which to identify the effectors causing phyllody. Electronic supplementary material The online version of this article (10.1186/s12864-017-4296-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | - Yukie Hiraka
- Iwate Biotechnology Research Center, Iwate, Japan
| | - Akira Abe
- Iwate Biotechnology Research Center, Iwate, Japan
| | | | | | | | | | - Hiromasa Saitoh
- Iwate Biotechnology Research Center, Iwate, Japan.,Department of Molecular Microbiology, Tokyo University of Agriculture, Tokyo, Japan
| | - Joe Win
- The Sainsbury Laboratory, Norwich, UK
| | | | - Ryohei Terauchi
- Iwate Biotechnology Research Center, Iwate, Japan. .,Kyoto University, Kyoto, Japan.
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The Nep1-like protein family of Magnaporthe oryzae is dispensable for the infection of rice plants. Sci Rep 2017; 7:4372. [PMID: 28663588 PMCID: PMC5491491 DOI: 10.1038/s41598-017-04430-0] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 05/15/2017] [Indexed: 01/02/2023] Open
Abstract
The necrosis- and ethylene-inducing protein 1 (Nep1)-like proteins (NLPs) are a class of microbe-associated molecular patterns widely distributed across diverse groups of plant-associated microorganisms. In spite of the cytotoxic activity in dicot plants, the role of most NLPs in the virulence of plant pathogens is still largely unknown. We showed that the MoNLP family of rice blast fungus varied very little in amino acid sequence, transient expression of three MoNLPs induced cell death and the production of reactive oxygen species in Nicotiana benthamiana, and the expression of MoNLPs was induced during infection of susceptible rice plants. To further investigate the biological role of the MoNLP family, a marker-free gene replacement vector was developed and used to knock out the whole family in Magnaporthe oryzae. Results showed no significant difference in disease levels caused by wild type and the quadruple ΔMoNLP mutant strains. Likewise, the sporulation and radial growth of the two strains were similar under various unfavorable cultural conditions including malnutrition and abiotic stresses. These observations demonstrated that the MoNLP family is dispensable for the fungal tolerance to the tested adverse cultural conditions, and more importantly, for the virulence of blast fungus on susceptible rice plants.
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50
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Franceschetti M, Maqbool A, Jiménez-Dalmaroni MJ, Pennington HG, Kamoun S, Banfield MJ. Effectors of Filamentous Plant Pathogens: Commonalities amid Diversity. Microbiol Mol Biol Rev 2017; 81:e00066-16. [PMID: 28356329 PMCID: PMC5485802 DOI: 10.1128/mmbr.00066-16] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Fungi and oomycetes are filamentous microorganisms that include a diversity of highly developed pathogens of plants. These are sophisticated modulators of plant processes that secrete an arsenal of effector proteins to target multiple host cell compartments and enable parasitic infection. Genome sequencing revealed complex catalogues of effectors of filamentous pathogens, with some species harboring hundreds of effector genes. Although a large fraction of these effector genes encode secreted proteins with weak or no sequence similarity to known proteins, structural studies have revealed unexpected similarities amid the diversity. This article reviews progress in our understanding of effector structure and function in light of these new insights. We conclude that there is emerging evidence for multiple pathways of evolution of effectors of filamentous plant pathogens but that some families have probably expanded from a common ancestor by duplication and diversification. Conserved folds, such as the oomycete WY and the fungal MAX domains, are not predictive of the precise function of the effectors but serve as a chassis to support protein structural integrity while providing enough plasticity for the effectors to bind different host proteins and evolve unrelated activities inside host cells. Further effector evolution and diversification arise via short linear motifs, domain integration and duplications, and oligomerization.
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Affiliation(s)
- Marina Franceschetti
- Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich, United Kingdom
| | - Abbas Maqbool
- Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich, United Kingdom
| | | | - Helen G Pennington
- The Sainsbury Laboratory, Norwich Research Park, Norwich, United Kingdom
| | - Sophien Kamoun
- The Sainsbury Laboratory, Norwich Research Park, Norwich, United Kingdom
| | - Mark J Banfield
- Department of Biological Chemistry, John Innes Centre, Norwich Research Park, Norwich, United Kingdom
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