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Ramírez N, Sigurbjörnsdóttir MA, Monteil C, Berge O, Heiðmarsson S, Jackson RW, Morris C, Vilhelmsson O. Pseudomonas syringae isolated in lichens for the first time: Unveiling Peltigera genus as the exclusive host. Environ Microbiol 2023; 25:3502-3511. [PMID: 37658725 DOI: 10.1111/1462-2920.16490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Accepted: 08/01/2023] [Indexed: 09/03/2023]
Abstract
Pseudomonas syringae is a bacterial complex that is widespread through a range of environments, typically associated with plants where it can be pathogenic, but also found in non-plant environments such as clouds, precipitation, and surface waters. Understanding its distribution within the environment, and the habitats it occupies, is important for examining its evolution and understanding behaviours. After a recent study found P. syringae living among a range of vascular plant species in Iceland, we questioned whether lichens could harbour P. syringae. Sixteen different species of lichens were sampled all over Iceland, but only one lichen genus, Peltigera, was found to consistently harbour P. syringae. Phylogenetic analyses of P. syringae from 10 sampling points where lichen, tracheophyte, and/or moss were simultaneously collected showed significant differences between sampling points, but not between different plants and lichens from the same point. Furthermore, while there were similarities in the P. syringae population in tracheophytes and Peltigera, the densities in Peltigera thalli were lower than in moss and tracheophyte samples. This discovery suggests P. syringae strains can localize and survive in organisms beyond higher plants, and thus reveals opportunities for studying their influence on P. syringae evolution.
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Affiliation(s)
- Natalia Ramírez
- Department of Natural Resource Sciences, University of Akureyri, Akureyri, Iceland
| | | | - Cecile Monteil
- INRA, UR0407 Pathologie Vegétale, Montfavet Cedex, France
| | - Odile Berge
- INRA, UR0407 Pathologie Vegétale, Montfavet Cedex, France
| | | | - Robert W Jackson
- School of Biosciences and Birmingham Institute of Forest Research, University of Birmingham, Birmingham, UK
| | - Cindy Morris
- INRA, UR0407 Pathologie Vegétale, Montfavet Cedex, France
| | - Oddur Vilhelmsson
- Department of Natural Resource Sciences, University of Akureyri, Akureyri, Iceland
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Jeong HM, Patterson H, Carella P. Bryo-FIGHTs: Emerging insights and principles acquired from non-vascular plant-pathogen interactions. CURRENT OPINION IN PLANT BIOLOGY 2023; 76:102484. [PMID: 37931549 DOI: 10.1016/j.pbi.2023.102484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 10/04/2023] [Accepted: 10/13/2023] [Indexed: 11/08/2023]
Abstract
Since the dawn of land plant evolution, pathogenic microbes have impacted plant health and threatened their survival. Though much of our knowledge on plant-pathogen interactions is derived from flowering plants, emerging research leveraging evolutionarily divergent non-vascular/non-seed bryophytes is beginning to shed light on the history and diversity of plant immune and infection processes. Here, we highlight key bryophyte-microbe pathosystems used to address fundamental questions on plant health. To this end, we outline the idea that core molecular aspects impacting plant infection and immunity are likely conserved across land plants. We discuss recent advances in the emerging field of Evo-MPMI (evolutionary molecular plant-microbe interactions) and highlight future opportunities that will clarify our understanding of the evolutionary framework that underpins host-pathogen interactions across the full spectrum of plant evolution.
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Affiliation(s)
- Hyeon-Min Jeong
- Cell and Developmental Biology, John Innes Centre, Colney Lane, Norwich, NR4 7UH, United Kingdom
| | - Henrietta Patterson
- Cell and Developmental Biology, John Innes Centre, Colney Lane, Norwich, NR4 7UH, United Kingdom
| | - Philip Carella
- Cell and Developmental Biology, John Innes Centre, Colney Lane, Norwich, NR4 7UH, United Kingdom.
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Hanlon R, Jimenez-Sanchez C, Benson J, Aho K, Morris C, Seifried TM, Baloh P, Grothe H, Schmale D. Diversity and ice nucleation activity of Pseudomonas syringae in drone-based water samples from eight lakes in Austria. PeerJ 2023; 11:e16390. [PMID: 38047025 PMCID: PMC10691352 DOI: 10.7717/peerj.16390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2023] [Accepted: 10/11/2023] [Indexed: 12/05/2023] Open
Abstract
Bacteria from the Pseudomonas syringae complex (comprised of at least 15 recognized species and more than 60 different pathovars of P. syringae sensu stricto) have been cultured from clouds, rain, snow, streams, rivers, and lakes. Some strains of P. syringae express an ice nucleation protein (hereafter referred to as ice+) that catalyzes the heterogeneous freezing of water. Though P. syringae has been sampled intensively from freshwater sources in the U.S. and France, little is known about the genetic diversity and ice nucleation activity of P. syringae in other parts of the world. We investigated the haplotype diversity and ice nucleation activity at -8 °C (ice+) of strains of P. syringae from water samples collected with drones in eight freshwater lakes in Austria. A phylogenetic analysis of citrate synthase (cts) sequences from 271 strains of bacteria isolated from a semi-selective medium for Pseudomonas revealed that 69% (188/271) belonged to the P. syringae complex and represented 32 haplotypes in phylogroups 1, 2, 7, 9, 10, 13, 14 and 15. Strains within the P. syringae complex were identified in all eight lakes, and seven lakes contained ice+ strains. Partial 16S rDNA sequences were analyzed from a total of 492 pure cultures of bacteria isolated from non-selective medium. Nearly half (43.5%; 214/492) were associated with the genus Pseudomonas. Five of the lakes (ALT, GRU, GOS, GOL, and WOR) were all distinguished by high levels of Pseudomanas (p ≤ 0.001). HIN, the highest elevation lake, had the highest percentage of ice+ strains. Our work highlights the potential for uncovering new haplotypes of P. syringae in aquatic habitats, and the use of robotic technologies to sample and characterize microbial life in remote settings.
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Affiliation(s)
- Regina Hanlon
- School of Plant and Environmental Sciences, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, Virginia, United States
| | - Celia Jimenez-Sanchez
- School of Plant and Environmental Sciences, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, Virginia, United States
| | - James Benson
- School of Plant and Environmental Sciences, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, Virginia, United States
| | - Ken Aho
- Department of Biological Sciences, Idaho State University, Pocatello, Idaho, United States
| | - Cindy Morris
- Institut National de la Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Montfavet, France
| | - Teresa M. Seifried
- Faculty of Technical Chemistry, TU Wien, Institute of Materials Chemistry, Vienna, Austria
| | - Philipp Baloh
- Faculty of Technical Chemistry, TU Wien, Institute of Materials Chemistry, Vienna, Austria
| | - Hinrich Grothe
- Faculty of Technical Chemistry, TU Wien, Institute of Materials Chemistry, Vienna, Austria
| | - David Schmale
- School of Plant and Environmental Sciences, Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, Virginia, United States
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Cooperative virulence via the collective action of secreted pathogen effectors. Nat Microbiol 2023; 8:640-650. [PMID: 36782026 DOI: 10.1038/s41564-023-01328-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Accepted: 01/13/2023] [Indexed: 02/15/2023]
Abstract
Although virulence is typically attributed to single pathogenic strains, here we investigated whether effectors secreted by a population of non-virulent strains could function as public goods to enable the emergence of collective virulence. We disaggregated the 36 type III effectors of the phytopathogenic bacterium Pseudomonas syringae strain PtoDC3000 into a 'metaclone' of 36 coisogenic strains, each carrying a single effector in an effectorless background. Each coisogenic strain was individually unfit, but the metaclone was collectively as virulent as the wild-type strain on Arabidopsis thaliana, suggesting that effectors can drive the emergence of cooperation-based virulence through their public action. We show that independently evolved effector suits can equally drive this cooperative behaviour by transferring the effector alleles native to the strain PmaES4326 into the conspecific but divergent strain PtoDC3000. Finally, we transferred the disaggregated PtoDC3000 effector arsenal into Pseudomonas fluorescens and show that their cooperative action was sufficient to convert this rhizosphere-inhabiting beneficial bacterium into a phyllosphere pathogen. These results emphasize the importance of microbial community interactions and expand the ecological scale at which disease may be attributed.
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Košćak L, Lamovšek J, Đermić E, Tegli S, Gruntar I, Godena S. Identification and Characterisation of Pseudomonas savastanoi pv. savastanoi as the Causal Agent of Olive Knot Disease in Croatian, Slovenian and Portuguese Olive ( Olea europaea L.) Orchards. PLANTS (BASEL, SWITZERLAND) 2023; 12:307. [PMID: 36679019 PMCID: PMC9865541 DOI: 10.3390/plants12020307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 01/04/2023] [Accepted: 01/07/2023] [Indexed: 06/17/2023]
Abstract
Strains of Pseudomonas savastanoi pv. savastanoi (Pss), isolated from infected olive trees (Olea europaea L.) in three European countries (Croatia, Slovenia and Portugal) were identified and characterised according to their colony morphology, physiological and biochemical features. According to the LOPAT scheme, 38.6% of Pss isolates were grouped in the Ib cluster. The Portuguese Pss strains were fully consistent with the typical LOPAT profile for this bacterium. Conversely, most Slovenian Pss strains showed delayed oxidase activity, whilst Croatian Pss strains did not produce any fluorescent pigment when grown in vitro. For Pss molecular identification, both end-point and real-time PCR were used, as well as MALDI-TOF, which was additionally used for proteomic analysis and the subsequent species identification of a number of strains that showed deviations from expected LOPAT results. Pss was confirmed as a causal agent of olive knot disease in 46.6% of olive orchards screened. Overall, these data suggests a possible correlation of certain Pss features with the geographical origin and the ecological niche of Pss isolates.
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Affiliation(s)
- Laura Košćak
- Institute of Agriculture and Tourism, Carlo Hugues 8, 52440 Poreč, Croatia
| | - Janja Lamovšek
- Agricultural Institute of Slovenia, Hacquetova ulica 17, 1000 Ljubljana, Slovenia
| | - Edyta Đermić
- Faculty of Agriculture, University of Zagreb, Zagreb, Svetošimunska cesta 25, 10000 Zagreb, Croatia
| | - Stefania Tegli
- Laboratorio di Patologia Vegetale Molecolare, Dipartimento di Scienze e Tecnologie Agrarie, Università degli Studi di Firenze, Alimentari, Ambientali e Forestali, Via della Lastruccia 10, 50019 Sesto Fiorentino, Firenze, Italy
| | - Igor Gruntar
- Institute of Microbiology and Parasitology, Veterinary Faculty, University of Ljubljana, Gerbičeva 60, 1000 Ljubljana, Slovenia
| | - Sara Godena
- Institute of Agriculture and Tourism, Carlo Hugues 8, 52440 Poreč, Croatia
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