Spatial and Temporal Variations in Size and Phenotypic Structure of Populations of Pseudomonas Syringae on Fruit Trees

  • Jacques L. Luisetti


Most pathovars of Pseudomonas syringae (P. syr.) are known to be epiphytes on their host plants. According to Leben (1965), this means that these phytopathogenic bacteria are able to survive on the aerial parts of the plants when the conditions are not favourable (mainly high temperature and low humidity), and to multiply significantly when they become favourable again (moisture after rain or dew). Quantitative variations have been reported for the epiphytic populations of P. syr. pathovars occurring on fruit trees (Crosse, 1959; English and Davis, 1960; Panagopoulos and Crosse, 1964; Panagopoulos, 1966; Ercolani, 1969; Gardan et al., 1972; Luisetti and Paulin, 1972; Latorre and Jones, 1979; Burr and Katz, 1984; Roos and Hatting, 1986; Bordjiba and Prunier, 1991) depending mainly on the stage of vegetative development but also on the plant genotype or on the climatic conditions (Latorre et al., 1985). As an example, Figure 1 shows the variations of the epiphytic populations of P. syr. pv. persicae, the causal agent of a severe die-back of peaches: a high level in spring followed by a strong decrease during summer and a significant increase during leaf fall.


Leaf Fall Peach Tree Pear Tree Phytopathogenic Bacterium Epiphytic Bacterium 
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Copyright information

© Plenum Press, New York 1996

Authors and Affiliations

  • Jacques L. Luisetti
    • 1
  1. 1.Station de Pathologie VégétaleInstitut National de la Recherche AgronomiqueBeaucouzé cedexFrance

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