Relative expression levels of PR1, PR2, PR3, LOXD, WRKYII and JERF3 genes in L. esculentum in response to Si treatment and inoculation with A. solani determined by qRT-PCR. Expression levels were compared with an internal control alpha tubulin. Data represent mean ± S.D of three technical replicates. Asterisks indicating statistically significant differences between Si-treated, A. solani-inoculated and Si + A. solani-inoculated plants (*p < 0.05; **p < 0.01)