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Tee EE, Faulkner C. Plasmodesmata and intercellular molecular traffic control. THE NEW PHYTOLOGIST 2024; 243:32-47. [PMID: 38494438 DOI: 10.1111/nph.19666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Accepted: 02/13/2024] [Indexed: 03/19/2024]
Abstract
Plasmodesmata are plasma membrane-lined connections that join plant cells to their neighbours, establishing an intercellular cytoplasmic continuum through which molecules can travel between cells, tissues, and organs. As plasmodesmata connect almost all cells in plants, their molecular traffic carries information and resources across a range of scales, but dynamic control of plasmodesmal aperture can change the possible domains of molecular exchange under different conditions. Plasmodesmal aperture is controlled by specialised signalling cascades accommodated in spatially discrete membrane and cell wall domains. Thus, the composition of plasmodesmata defines their capacity for molecular trafficking. Further, their shape and density can likewise define trafficking capacity, with the cell walls between different cell types hosting different numbers and forms of plasmodesmata to drive molecular flux in physiologically important directions. The molecular traffic that travels through plasmodesmata ranges from small metabolites through to proteins, and possibly even larger mRNAs. Smaller molecules are transmitted between cells via passive mechanisms but how larger molecules are efficiently trafficked through plasmodesmata remains a key question in plasmodesmal biology. How plasmodesmata are formed, the shape they take, what they are made of, and what passes through them regulate molecular traffic through plants, underpinning a wide range of plant physiology.
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Affiliation(s)
- Estee E Tee
- Cell and Developmental Biology, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK
| | - Christine Faulkner
- Cell and Developmental Biology, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK
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Talbi N, Blekemolen MC, Janevska S, Zendler D, van Tilbeurgh H, Fudal I, Takken FLW. Facilitation of Symplastic Effector Protein Mobility by Paired Effectors Is Conserved in Different Classes of Fungal Pathogens. MOLECULAR PLANT-MICROBE INTERACTIONS : MPMI 2024; 37:304-314. [PMID: 37782126 DOI: 10.1094/mpmi-07-23-0103-fi] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
It has been discovered that plant pathogens produce effectors that spread via plasmodesmata (PD) to allow modulation of host processes in distal uninfected cells. Fusarium oxysporum f. sp. lycopersici (Fol) facilitates effector translocation by expansion of the size-exclusion limit of PD using the Six5/Avr2 effector pair. How other fungal pathogens manipulate PD is unknown. We recently reported that many fungal pathogens belonging to different families carry effector pairs that resemble the SIX5/AVR2 gene pair from Fol. Here, we performed structural predictions of three of these effector pairs from Leptosphaeria maculans (Lm) and tested their ability to manipulate PD and to complement the virulence defect of a Fol SIX5 knockout mutant. We show that the AvrLm10A homologs are structurally related to FolSix5 and localize at PD when they are expressed with their paired effectors. Furthermore, these effectors were found to complement FolSix5 function in cell-to-cell mobility assays and in fungal virulence. We conclude that distantly related fungal species rely on structurally related paired effector proteins to manipulate PD and facilitate effector mobility. The wide distribution of these effector pairs implies Six5-mediated effector translocation to be a conserved propensity among fungal plant pathogens. [Formula: see text] Copyright © 2024 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)
- Nacera Talbi
- Université Paris-Saclay, INRAE, UR BIOGER, 91120 Palaiseau, France
| | - Mila C Blekemolen
- Molecular Plant Pathology, Swammerdam Institute of Life Science (SILS), University of Amsterdam, Amsterdam, the Netherlands
| | - Slavica Janevska
- Molecular Plant Pathology, Swammerdam Institute of Life Science (SILS), University of Amsterdam, Amsterdam, the Netherlands
| | - Daniel Zendler
- Molecular Plant Pathology, Swammerdam Institute of Life Science (SILS), University of Amsterdam, Amsterdam, the Netherlands
| | - Herman van Tilbeurgh
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, France
| | - Isabelle Fudal
- Université Paris-Saclay, INRAE, UR BIOGER, 91120 Palaiseau, France
| | - Frank L W Takken
- Molecular Plant Pathology, Swammerdam Institute of Life Science (SILS), University of Amsterdam, Amsterdam, the Netherlands
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Sakane K, Akiyama M, Jogaiah S, Ito SI, Sasaki K. Pathogenicity chromosome of Fusarium oxysporum f. sp. cepae. Fungal Genet Biol 2024; 170:103860. [PMID: 38114016 DOI: 10.1016/j.fgb.2023.103860] [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: 06/13/2023] [Revised: 11/10/2023] [Accepted: 12/16/2023] [Indexed: 12/21/2023]
Abstract
Fusarium oxysporum f. sp. cepae (Foc) is the causative agent of Fusarium basal rot disease in onions, which leads to catastrophic global crop production losses. Therefore, the interaction of Foc with its host has been actively investigated, and the pathogen-specific (PS) regions of the British strain Foc_FUS2 have been identified. However, it has not been experimentally determined whether the identified PS region plays a role in pathogenicity. To identify the pathogenicity chromosome in the Japanese strain Foc_TA, we initially screened effector candidates, defined as small proteins with a signal peptide that contain two or more cysteines, from genome sequence data. Twenty-one candidate effectors were identified, five of which were expressed during infection. Of the expressed effector candidates, four were located on the 4-Mb-sized chromosome in Foc_TA. To clarify the relationship between pathogenicity and the 4-Mb-sized chromosome in Foc_TA, nine putative 4-Mb-sized chromosome loss strains were generated by treatment with benomyl (a mitotic inhibitor drug). A pathogenicity test with putative 4-Mb-sized chromosome loss strains showed that these strains were impaired in their pathogenicity toward onions. Genome analysis of three putative 4-Mb-sized chromosome loss strains revealed that two strains lost a 4-Mb-sized chromosome in common, and another strain maintained a 0.9-Mb region of the 4-Mb-sized chromosome. Our findings show that the 4-Mb-sized chromosome is the pathogenicity chromosome in Foc_TA, and the 3.1-Mb region within the 4-Mb-sized chromosome is required for full pathogenicity toward onion.
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Affiliation(s)
- Kosei Sakane
- The United Graduate School of Agricultural Sciences, Tottori University, Tottori 680-8553, Japan
| | - Mitsunori Akiyama
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Sudisha Jogaiah
- Department of Environmental Science, Central University of Kerala, Tejaswini Hills, Kasaragod 671316, India
| | - Shin-Ichi Ito
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8515, Japan; Research Center for Thermotolerant Microbial Resources (RCTMR), Yamaguchi University, Yamaguchi 753-8515, Japan
| | - Kazunori Sasaki
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8515, Japan; Research Center for Thermotolerant Microbial Resources (RCTMR), Yamaguchi University, Yamaguchi 753-8515, Japan.
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Gutiérrez-Sánchez A, Plasencia J, Monribot-Villanueva JL, Rodríguez-Haas B, Ruíz-May E, Guerrero-Analco JA, Sánchez-Rangel D. Virulence factors of the genus Fusarium with targets in plants. Microbiol Res 2023; 277:127506. [PMID: 37783182 DOI: 10.1016/j.micres.2023.127506] [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: 07/10/2023] [Revised: 09/21/2023] [Accepted: 09/21/2023] [Indexed: 10/04/2023]
Abstract
Fusarium spp. comprise various species of filamentous fungi that cause severe diseases in plant crops of both agricultural and forestry interest. These plant pathogens produce a wide range of molecules with diverse chemical structures and biological activities. Genetic functional analyses of some of these compounds have shown their role as virulence factors (VF). However, their mode of action and contributions to the infection process for many of these molecules are still unknown. This review aims to analyze the state of the art in Fusarium VF, emphasizing their biological targets on the plant hosts. It also addresses the current experimental approaches to improve our understanding of their role in virulence and suggests relevant research questions that remain to be answered with a greater focus on species of agroeconomic importance. In this review, a total of 37 confirmed VF are described, including 22 proteinaceous and 15 non-proteinaceous molecules, mainly from Fusarium oxysporum and Fusarium graminearum and, to a lesser extent, in Fusarium verticillioides and Fusarium solani.
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Affiliation(s)
- Angélica Gutiérrez-Sánchez
- Laboratorios de Fitopatología y Biología Molecular, Red de Estudios Moleculares Avanzados, Clúster BioMimic®, Instituto de Ecología, A. C. Xalapa, Veracruz 91073, Mexico; Laboratorio de Química de Productos Naturales, Red de Estudios Moleculares Avanzados, Clúster BioMimic®, Instituto de Ecología, A. C. Xalapa, Veracruz 91073, Mexico
| | - Javier Plasencia
- Departamento de Bioquímica, Facultad de Química, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
| | - Juan L Monribot-Villanueva
- Laboratorio de Química de Productos Naturales, Red de Estudios Moleculares Avanzados, Clúster BioMimic®, Instituto de Ecología, A. C. Xalapa, Veracruz 91073, Mexico
| | - Benjamín Rodríguez-Haas
- Laboratorios de Fitopatología y Biología Molecular, Red de Estudios Moleculares Avanzados, Clúster BioMimic®, Instituto de Ecología, A. C. Xalapa, Veracruz 91073, Mexico
| | - Eliel Ruíz-May
- Laboratorio de Proteómica, Red de Estudios Moleculares Avanzados, Clúster BioMimic®, Instituto de Ecología, A. C. Xalapa, Veracruz 91073, Mexico
| | - José A Guerrero-Analco
- Laboratorio de Química de Productos Naturales, Red de Estudios Moleculares Avanzados, Clúster BioMimic®, Instituto de Ecología, A. C. Xalapa, Veracruz 91073, Mexico.
| | - Diana Sánchez-Rangel
- Laboratorios de Fitopatología y Biología Molecular, Red de Estudios Moleculares Avanzados, Clúster BioMimic®, Instituto de Ecología, A. C. Xalapa, Veracruz 91073, Mexico; Investigador por México - CONAHCyT en la Red de Estudios Moleculares Avanzados del Instituto de Ecología, A. C. (INECOL), Carretera antigua a Coatepec 351, El Haya, Xalapa, Veracruz 91073, Mexico.
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Blekemolen MC, Liu Z, Stegman M, Zipfel C, Shan L, Takken FLW. The PTI-suppressing Avr2 effector from Fusarium oxysporum suppresses mono-ubiquitination and plasma membrane dissociation of BIK1. MOLECULAR PLANT PATHOLOGY 2023; 24:1273-1286. [PMID: 37391937 PMCID: PMC10502843 DOI: 10.1111/mpp.13369] [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: 12/07/2022] [Revised: 06/01/2023] [Accepted: 06/06/2023] [Indexed: 07/02/2023]
Abstract
Plant pathogens use effector proteins to target host processes involved in pathogen perception, immune signalling, or defence outputs. Unlike foliar pathogens, it is poorly understood how root-invading pathogens suppress immunity. The Avr2 effector from the tomato root- and xylem-colonizing pathogen Fusarium oxysporum suppresses immune signalling induced by various pathogen-associated molecular patterns (PAMPs). It is unknown how Avr2 targets the immune system. Transgenic AVR2 Arabidopsis thaliana phenocopies mutants in which the pattern recognition receptor (PRR) co-receptor BRI1-ASSOCIATED RECEPTOR KINASE (BAK1) or its downstream signalling kinase BOTRYTIS-INDUCED KINASE 1 (BIK1) are knocked out. We therefore tested whether these kinases are Avr2 targets. Flg22-induced complex formation of the PRR FLAGELLIN SENSITIVE 2 and BAK1 occurred in the presence and absence of Avr2, indicating that Avr2 does not affect BAK1 function or PRR complex formation. Bimolecular fluorescence complementation assays showed that Avr2 and BIK1 co-localize in planta. Although Avr2 did not affect flg22-induced BIK1 phosphorylation, mono-ubiquitination was compromised. Furthermore, Avr2 affected BIK1 abundance and shifted its localization from nucleocytoplasmic to the cell periphery/plasma membrane. Together, these data imply that Avr2 may retain BIK1 at the plasma membrane, thereby suppressing its ability to activate immune signalling. Because mono-ubiquitination of BIK1 is required for its internalization, interference with this process by Avr2 could provide a mechanistic explanation for the compromised BIK1 mobility upon flg22 treatment. The identification of BIK1 as an effector target of a root-invading vascular pathogen identifies this kinase as a conserved signalling component for both root and shoot immunity.
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Affiliation(s)
- Mila C. Blekemolen
- Molecular Plant Pathology, Swammerdam Institute of Life ScienceUniversity of AmsterdamAmsterdamNetherlands
| | - Zunyong Liu
- Department of Biochemistry & BiophysicsTexas A&M UniversityCollege StationTexasUSA
| | - Martin Stegman
- The Sainsbury LaboratoryUniversity of East AngliaNorwichUK
- Present address:
Phytopathology, School of Life SciencesTechnical University of MunichFreisingGermany
| | - Cyril Zipfel
- The Sainsbury LaboratoryUniversity of East AngliaNorwichUK
- Institute of Plant and Microbial Biology, Zurich‐Basel Plant Science CenterUniversity of ZurichZurichSwitzerland
| | - Libo Shan
- Department of Biochemistry & BiophysicsTexas A&M UniversityCollege StationTexasUSA
| | - Frank L. W. Takken
- Molecular Plant Pathology, Swammerdam Institute of Life ScienceUniversity of AmsterdamAmsterdamNetherlands
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Li N, Lin Z, Yu P, Zeng Y, Du S, Huang LJ. The multifarious role of callose and callose synthase in plant development and environment interactions. FRONTIERS IN PLANT SCIENCE 2023; 14:1183402. [PMID: 37324665 PMCID: PMC10264662 DOI: 10.3389/fpls.2023.1183402] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 05/05/2023] [Indexed: 06/17/2023]
Abstract
Callose is an important linear form of polysaccharide synthesized in plant cell walls. It is mainly composed of β-1,3-linked glucose residues with rare amount of β-1,6-linked branches. Callose can be detected in almost all plant tissues and are widely involved in various stages of plant growth and development. Callose is accumulated on plant cell plates, microspores, sieve plates, and plasmodesmata in cell walls and is inducible upon heavy metal treatment, pathogen invasion, and mechanical wounding. Callose in plant cells is synthesized by callose synthases located on the cell membrane. The chemical composition of callose and the components of callose synthases were once controversial until the application of molecular biology and genetics in the model plant Arabidopsis thaliana that led to the cloning of genes encoding synthases responsible for callose biosynthesis. This minireview summarizes the research progress of plant callose and its synthetizing enzymes in recent years to illustrate the important and versatile role of callose in plant life activities.
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Affiliation(s)
- Ning Li
- State Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees, College of Forestry, Central South University of Forestry and Technology, Changsha, China
- Key Laboratory of Forest Bio-resources and Integrated Pest Management for Higher Education in Hunan Province, Central South University of Forestry and Technology, Changsha, China
| | - Zeng Lin
- State Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees, College of Forestry, Central South University of Forestry and Technology, Changsha, China
| | - Peiyao Yu
- State Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees, College of Forestry, Central South University of Forestry and Technology, Changsha, China
| | - Yanling Zeng
- State Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees, College of Forestry, Central South University of Forestry and Technology, Changsha, China
| | - Shenxiu Du
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Li-Jun Huang
- State Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees, College of Forestry, Central South University of Forestry and Technology, Changsha, China
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