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Relative expression levels of PM-responsive defensive genes during PM infection and salicylic acid (SA) treatment. The fold change was calculated relative to healthy leaf samples which were assigned a value of 1. Error bars indicate the standard deviation (SD) of means. Significant differences at P < 0.001, P < 0.01, P < 0.1 have been shown with 3 (***), 2 (*) and 1 (*) asterisks
