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Virulent and avirulent isolates of Pseudomonas syringae subsp. savastanoi as colonizers of olive leaves: evaluation of possible biological control of the olive knot pathogen 1
Author(s) -
VARVARO L.,
MARTELLA L.
Publication year - 1993
Publication title -
eppo bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.327
H-Index - 36
eISSN - 1365-2338
pISSN - 0250-8052
DOI - 10.1111/j.1365-2338.1993.tb01347.x
Subject(s) - virulence , pseudomonas syringae , biology , microbiology and biotechnology , olive leaf , phyllosphere , inoculation , bacteria , bacteriocin , pathogen , epiphyte , olive trees , mutant , botany , horticulture , gene , biochemistry , genetics , antimicrobial
The epiphytic survival of virulent and avirulent (indoleacetic acid‐deficient mutants) isolates of Pseudomonas syringae subsp. savastanoi , and their ability to colonize the olive phylloplane, was monitored for up to 30 days after artificial inoculation of several olive cultivars. After an initial decrease in numbers, the virulent bacteria multiplied and established a potential inoculum on olive leaf surfaces. In contrast, the numbers of avirulent bacteria rapidly diminished, so that they were eventually no longer detectable. Under the conditions used in this study, none of the avirulent mutants (producers or non‐producers of bacteriocins) were able to compete with or successfully to inhibit the virulent isolate in vivo. This was probably due to the lack of epiphytic multiplication of the avirulent mutants.