Pathogens produce small molecule effectors that mimic plant hormones.
Some P syringae strains make coronatine, a jasmonic acid
mimic that suppresses salicylic-acid-mediated defence to biotrophic
pathogens49,50 and induces stomatal opening, helping pathogenic
bacteria gain access to the apoplast51. PTI involves repression of auxin
responses, mediated in part by a micro-RNA that is also induced
during abscisic-acid-mediated stress responses52. Gibberellin is produced
by the fungal pathogen Gibberella fujikuroi leading to ‘foolish
seedling’ syndrome, and cytokinin produced by many pathogens can
promote pathogen success through retardation of senescence in
infected leaf tissue. The interplay between PTI and normal hormone
signalling, and pathogen mimics that influence it, is just beginning to
be unravelled.
Pathogens produce small molecule effectors that mimic plant hormones.Some P syringae strains make coronatine, a jasmonic acidmimic that suppresses salicylic-acid-mediated defence to biotrophicpathogens49,50 and induces stomatal opening, helping pathogenicbacteria gain access to the apoplast51. PTI involves repression of auxinresponses, mediated in part by a micro-RNA that is also inducedduring abscisic-acid-mediated stress responses52. Gibberellin is producedby the fungal pathogen Gibberella fujikuroi leading to ‘foolishseedling’ syndrome, and cytokinin produced by many pathogens canpromote pathogen success through retardation of senescence ininfected leaf tissue. The interplay between PTI and normal hormonesignalling, and pathogen mimics that influence it, is just beginning tobe unravelled.
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