Bacteria from four phylogroups of the <i>Pseudomonas syringae</i> complex can cause bacterial canker of apricot

Parisi, Luciana; Morgaint, Benedicte; Blanco-García, José A.; Guilbaud, Caroline; Chandeysson, Charlotte; Bourgeay, Jean-François; Moronvalle, A.; Brun, Laurent; Brachet, Marie-Lisa; Morris, Cindy E.

doi:10.1111/ppa.13051

Cited by 23 publications

(24 citation statements)

References 38 publications

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“…Ruinelli et al ( 2019 ) found that a large number of various P. syringae strains are pathogenic on the tested hosts (cherry, peach and almond). Similarly Parisi et al ( 2019 ), isolated four phylogroups (PG01, 02, 03 and 07) able to induce canker on apricot. Ruinelli et al ( 2019 ) suggest the diversity of strains pathogenic on Prunus is probably due to independent evolution of individual strains, not necessarily related to virulence.…”

Section: Discussionmentioning

confidence: 75%

Diversity of pathogenic Pseudomonas isolated from citrus in Tunisia

et al. 2020

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The damages observed in Tunisian citrus orchards have prompted studies on the Pseudomonas spp. responsible for blast and black pit. Prospective orchards between 2015 and 2017 showed that the diseases rapidly spread geographically and to new cultivars. A screening of Pseudomonas spp. isolated from symptomatic trees revealed their wide diversity according to phylogenetic analysis of their housekeeping rpoD and cts genes. The majority of strains were affiliated to Pseudomonas syringae pv. syringae (Phylogroup PG02b), previously described in Tunisia. However, they exhibited various BOX-PCR fingerprints and were not clonal. This work demonstrated, for the first time in Tunisia, the involvement of Pseudomonas cerasi (PG02a) and Pseudomonas congelans (PG02c). The latter did not show significant pathogenicity on citrus, but was pathogenic on cantaloupe and active for ice nucleation that could play a role in the disease. A comparative phylogenetic study of citrus pathogens from Iran, Montenegro and Tunisia revealed that P. syringae (PG02b) strains are closely related but again not clonal. Interestingly P. cerasi (PG02a) was isolated in two countries and seems to outspread. However, its role in the diseases is not fully understood and it should be monitored in future studies. The diversity of pathogenic Pseudomonas spp. and the extension of the diseases highlight that they have become complex and synergistic. It opens questions about which factors favor diseases and how to fight against them efficiently and with sustainable means.

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Section: Discussionmentioning

confidence: 75%

Diversity of pathogenic Pseudomonas isolated from citrus in Tunisia

et al. 2020

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“…This species has been isolated from a variety of environmental sources, including asymptomatic wild plants, snow, epilithic biofilms, and icepacks. either with a single gene or in multilocus sequence analysis (MLSA) using P. viridiflava isolates (Berge et al, 2014;Goss et al, 2005;Parisi et al, 2019;Parkinson et al, 2011;Sarris et al, 2012). It has been suggested that the cts, gapA, or rpoD housekeeping genes alone are sufficient to place a P. viridiflava isolate into its phylogroup in the P. syringae complex (Berge et al, 2014;Parkinson et al, 2011).…”

Section: Taxonomymentioning

confidence: 99%

Pseudomonas viridiflava: An internal outsider of the Pseudomonas syringae species complex

Lipps

Samac²

2021

Molecular Plant Pathology

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“…Nine strains of Pseudomonas syringae, the causal agent of bacterial canker of apricot, were inoculated on dormant tissues of twenty apricot cultivars chosen according to their differential susceptibility in orchard conditions. The strains were chosen mainly within phylogroups 1 and 2, the most abundant groups of P. syringae in contaminated apricot orchards in France (Parisi et al 2019).…”

Section: Matrices To 4: Pseudomonas Syringae-prunus Armeniaca (Apricot)mentioning

confidence: 99%

The quasi-universality of nestedness in the structure of quantitative plant-parasite interactions

Moury¹,

Audergon²,

Baudracco-Arnas³

et al. 2021

Preprint

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Understanding the relationships between host range and pathogenicity for parasites, and between the efficiency and scope of immunity for hosts are essential to implement efficient disease control strategies. In the case of plant parasites, most studies have focused on describing qualitative interactions and a variety of genetic and evolutionary models has been proposed in this context. Although plant quantitative resistance benefits from advantages in terms of durability, we presently lack models that account for quantitative interactions between plants and their parasites and the evolution of these interactions. Nestedness and modularity are important features to unravel the overall structure of host-parasite interaction matrices. Here, we analysed these two features on 32 matrices of quantitative pathogenicity trait data gathered from 15 plant-parasite pathosystems consisting of either annual or perennial plants along with fungi or oomycetes, bacteria, nematodes, insects and viruses. The performance of several nestedness and modularity algorithms was evaluated through a simulation approach, which helped interpretation of the results. We observed significant modularity in only six of the 32 matrices, with two or three modules detected. For three of these matrices, modules could be related to resistance quantitative trait loci present in the host. In contrast, we found high and significant nestedness in 30 of the 32 matrices. Nestedness was linked to other properties of plant-parasite interactions. First, pathogenicity trait values were explained in majority by a parasite strain effect and a plant accession effect, with no parasite-plant interaction term. Second, correlations between the efficiency and scope of the resistance of plant genotypes, and between the host range breadth and pathogenicity level of parasite strains were overall positive. This latter result questions the efficiency of strategies based on the deployment of several genetically-differentiated cultivars of a given crop species in the case of quantitative plant immunity.

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Bacteria from four phylogroups of the Pseudomonas syringae complex can cause bacterial canker of apricot

Cited by 23 publications

References 38 publications

Diversity of pathogenic Pseudomonas isolated from citrus in Tunisia

Diversity of pathogenic Pseudomonas isolated from citrus in Tunisia

Pseudomonas viridiflava: An internal outsider of the Pseudomonas syringae species complex

The quasi-universality of nestedness in the structure of quantitative plant-parasite interactions

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