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Mechanism of Cold‐induced Peach Stem Infection by Pseudomonas s. pv. persicae: Water Congestion in Tissues
Author(s) -
Vigouroux A.
Publication year - 1991
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1991.tb00104.x
Subject(s) - biology , pseudomonas syringae , bacteria , prunus , inoculation , pseudomonas , horticulture , pseudomonas putida , pseudomonadaceae , microbiology and biotechnology , botany , pathogen , genetics
We have previously shown that water congestion in tissues, caused by thawing after a period of slightly negative temperatures, results in the absorption and diffusion of bacteria in the bark tissues of peach stems ( Prunus persica ). In the present study we demonstrate that in peach branches acclimated to cold and inoculated with the bacterium Pseudomonas syringae pv. persicae , this freezing‐thawing process is sufficient to induce, with no further treatment than incubation at + 10 °C, the development of cankers very similar to those observed in orchards in the winter. The first step of the process induces a particularly effective form of contamination and thus corresponds to an epidemiological phenomenon. The diffused bacterium, then, initiates pathogenic activity in locations favorable to its development. Moreover, an additional freezing‐thawing sequence can result in the extension of ongoing infection by causing diffusion of bacteria from infected tissue to healthy areas.