[en] Root treatment by the non-pathogenic Pseudomonas putida strain BTP1 reduced by 34% the disease caused by Botrytis cinerea on tomato leaves. This induced systemic resistance phenomenon is associated both with the accumulation of fungitoxic material and with the stimulation of the lipoxygenase pathway in infected leaves. More precisely, we observed a consistent change in the expression of a new tomloxF gene in the leaves from
BTP1-treated plants as far as the pathogen is introduced. This suggests that the roots were
primed and reacted locally to colonization by bacteria and that defense-related gene
expression is turned on systemically upon pathogen perception
