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Pathogens
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Pseudomonas syringae Species Complex
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Pseudomonas syringae Species Complex

A special issue of Pathogens (ISSN 2076-0817). This special issue belongs to the section "Bacterial Pathogens".

Deadline for manuscript submissions: closed (30 September 2021) | Viewed by 8938

Special Issue Editor

Prof. Dr. Teresa Coutinho

E-Mail Website
Guest Editor
Centre for Microbial Ecology and Genomics, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, South Africa
Interests: biology and ecology of plant pathogenic bacteria
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Members of the Pseudomonas syringae species complex include pathogens responsible for diseases on a wide range of plant species and have also been isolated from non-agricultural habitats. They commonly live on the phyllosphere as epiphytes and under ideal environmental conditions can enter the plant through wounds and natural openings to cause disease. Once within the apoplast, they rely on two virulence strategies, viz. host immunity suppression and the creation of an aqueous apoplast. They may also use other virulence factors. Members of the complex are strongly influenced by external environmental conditions. Little is known on the plant–pathogen–environment–microbiota interactions in this system. For this Special Issue of Pathogens, we invite you to submit research articles, review articles, short notes, as well as communications related to the virulence mechanisms used by different members of the Ps. syringae species complex, how abiotic and biotic factors influence infection, and factors influencing host adaptation by this economically important plant pathogen. We look forward to your contribution.

Prof. Teresa Coutinho
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Pathogens is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Pseudomonas syringae
  • Pathogenicity
  • Virulence
  • Microbiome
  • Environmental factors
  • Host adaptation

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Published Papers (2 papers)

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Research

16 pages, 3623 KiB  
Article
Pseudomonas syringae on Plants in Iceland Has Likely Evolved for Several Million Years Outside the Reach of Processes That Mix This Bacterial Complex across Earth’s Temperate Zones
by Cindy E. Morris, Natalia Ramirez, Odile Berge, Christelle Lacroix, Cécile Monteil, Charlotte Chandeysson, Caroline Guilbaud, Anett Blischke, Margrét Auður Sigurbjörnsdóttir and Oddur Þ. Vilhelmsson
Pathogens 2022, 11(3), 357; https://doi.org/10.3390/pathogens11030357 - 15 Mar 2022
Cited by 6 | Viewed by 4050
Abstract
Here we report, for the first time, the occurrence of the bacteria from the species complex Pseudomonas syringae in Iceland. We isolated this bacterium from 35 of the 38 samples of angiosperms, moss, ferns and leaf litter collected across the island from five [...] Read more.
Here we report, for the first time, the occurrence of the bacteria from the species complex Pseudomonas syringae in Iceland. We isolated this bacterium from 35 of the 38 samples of angiosperms, moss, ferns and leaf litter collected across the island from five habitat categories (boreal heath, forest, subalpine and glacial scrub, grazed pasture, lava field). The culturable populations of P. syringae on these plants varied in size across 6 orders of magnitude, were as dense as 107 cfu g−1 and were composed of strains in phylogroups 1, 2, 4, 6, 7, 10 and 13. P. syringae densities were significantly greatest on monocots compared to those on dicots and mosses and were about two orders of magnitude greater in grazed pastures compared to all other habitats. The phylogenetic diversity of 609 strains of P. syringae from Iceland was compared to that of 933 reference strains of P. syringae from crops and environmental reservoirs collected from 27 other countries based on a 343 bp sequence of the citrate synthase (cts) housekeeping gene. Whereas there were examples of identical cts sequences across multiple countries and continents among the reference strains indicating mixing among these countries and continents, the Icelandic strains grouped into monophyletic lineages that were unique compared to all of the reference strains. Based on estimates of the time of divergence of the Icelandic genetic lineages of P. syringae, the geological, botanical and land use history of Iceland, and atmospheric circulation patterns, we propose scenarios whereby it would be feasible for P. syringae to have evolved outside the reach of processes that tend to mix this bacterial complex across the planet elsewhere. Full article
(This article belongs to the Special Issue Pseudomonas syringae Species Complex)
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21 pages, 8328 KiB  
Article
QTL Mapping for Resistance to Cankers Induced by Pseudomonas syringae pv. actinidiae (Psa) in a Tetraploid Actinidia chinensis Kiwifruit Population
by Jibran Tahir, Cyril Brendolise, Stephen Hoyte, Marielle Lucas, Susan Thomson, Kirsten Hoeata, Catherine McKenzie, Andrew Wotton, Keith Funnell, Ed Morgan, Duncan Hedderley, David Chagné, Peter M. Bourke, John McCallum, Susan E. Gardiner and Luis Gea
Pathogens 2020, 9(11), 967; https://doi.org/10.3390/pathogens9110967 - 20 Nov 2020
Cited by 22 | Viewed by 4026
Abstract
Polyploidy is a key driver of significant evolutionary changes in plant species. The genus Actinidia (kiwifruit) exhibits multiple ploidy levels, which contribute to novel fruit traits, high yields and resistance to the canker-causing dieback disease incited by Pseudomonas syringae pv. actinidiae (Psa) biovar [...] Read more.
Polyploidy is a key driver of significant evolutionary changes in plant species. The genus Actinidia (kiwifruit) exhibits multiple ploidy levels, which contribute to novel fruit traits, high yields and resistance to the canker-causing dieback disease incited by Pseudomonas syringae pv. actinidiae (Psa) biovar 3. However, the genetic mechanism for resistance to Psa observed in polyploid kiwifruit is not yet known. In this study we performed detailed genetic analysis of a tetraploid Actinidia chinensis var. chinensis population derived from a cross between a female parent that exhibits weak tolerance to Psa and a highly Psa-resistant male parent. We used the capture-sequencing approach across the whole kiwifruit genome and generated the first ultra-dense maps in a tetraploid kiwifruit population. We located quantitative trait loci (QTLs) for Psa resistance on these maps. Our approach to QTL mapping is based on the use of identity-by-descent trait mapping, which allowed us to relate the contribution of specific alleles from their respective homologues in the male and female parent, to the control of Psa resistance in the progeny. We identified genes in the diploid reference genome whose function is suggested to be involved in plant defense, which underly the QTLs, including receptor-like kinases. Our study is the first to cast light on the genetics of a polyploid kiwifruit and suggest a plausible mechanism for Psa resistance in this species. Full article
(This article belongs to the Special Issue Pseudomonas syringae Species Complex)
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