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Identification of the reservoirs of <em>Pseudomonas syringae</em> in <em>Prunus armeniaca</em> orchards

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HAL Id: hal-02801137

https://hal.inrae.fr/hal-02801137

Submitted on 5 Jun 2020

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Identification of the reservoirs of Pseudomonas syringae

in Prunus armeniaca orchards

Luciana Parisi, Benoit Borschinger, Charlotte Chandeysson, Jean-François

Bourgeay, Odile Berge, Cindy E. Morris

To cite this version:

Luciana Parisi, Benoit Borschinger, Charlotte Chandeysson, Jean-François Bourgeay, Odile Berge, et al.. Identification of the reservoirs of Pseudomonas syringae in Prunus armeniaca orchards. 2. International workshop on bacterial diseases of stone fruits and nuts, Apr 2015, Izmir, Turkey. 1 p., 2015. �hal-02801137�

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2. International Workshop on bacterial diseases of stone fruits and nuts

21-24 April 2015, Izmir, Turkey

Identification of the reservoirs of Pseudomonas syringae in

Prunus armeniaca orchards

Luciana Parisi, Benoit Borschinger, Charlotte Chandeysson, Jean-François Bourgeay, Odile Berge, Cindy Morris

INRA, PACA Research Center, Plant Pathology Research Unit, Domaine de St Maurice, 67 Allée des Chênes, CS60094, 84143 Montfavet cedex, France

Bacterial cankers of perennial trees caused by Pseudomonas syringae provoke serious economic losses all around the world, and also affect tree species in the genus Prunus. When pedo-climatic conditions are favorable, the disease can severely affect apricot (Prunus

armeniaca).The epidemiology of this complex disease is not completely understood. Based on

recent work on the presence of P. syringae in very diverse non-agricultural habitats, the complexity of the phylogeny of P. syringae, and the existence of phylogroups containing more aggressive strains than others, the scope of this work was the identification of the potential reservoirs of pathogenic strains of P. syringae in Prunus orchards. We addressed the following questions: What is the structure of the P. syringae population in the ground-cover, in the soil, in the irrigation water, and in the plant (epiphytic and endogenous)? What are the relationships between these populations and the populations in non-agricultural habitats? What are the factors that trigger disease when pathogenic populations are present? To answer these questions, a specific molecular detection method, by PCR, allowing rapid and accurate identification of the different phylogroups of P. syringae was developed. With this method, the different potential reservoirs: plants (buds, leaves, twigs), cover-grass, soil, and water, were investigated in 2014 in 3 different French orchards of apricot, at 3 different periods of the plant’s vegetative development. Leaf litter was collected and analyzed during winter. Preliminary results showed different structuration of the populations according to their origin. For example, in March, the abundance of isolates of phylogroup 1 (including P. syringae morsprunorum race 2) and phylogroup 2 (including P. syringae pv syringae) was different in plant, soil and ground-cover populations.

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