Biological control agents cause induction of systemic resistance through an array of elicitors. In this work, the role of some synthetic compounds in Bacillus subtilis GB03 volatiles^, profile was assessed on either direct inhibition or induction of systemic resistance against B. cinerea in Arabidopsis. In comparison with control, all the compounds not only did not suppress fungal sporulation but also increased it significantly. Maximum effects on sporulation were obtained by 3-pentanol and methyl salicylate with 4.7 ×10⁵ and 4 ×10⁵ spore/ml, respectively. Most of the compounds promoted fungal growth, the highest rates of which were  recorded in case of methyl jasmonate and methyl salicylate with respective 23 and 24 percent. Interestingly, minimum vs. maximum of pigment production was also recorded for methyl jasmonate and methyl salicylate, respectively. In induction of resistance experiment, 3- hydroxy-2 butanol, methyl jasmonate, butanediol, acetone and 1-pentanol exerted the highest effect in suppression of disease on Arabidopsis. Methyl salicylate and 3-pentanol,  known for their stimulation of defense against biotrophs did not show any noticeable effect in suppression of this necrotrophic pathogen. Eventually, efficiency of the compounds is dependent upon their doses and in low dose they mainly act as signalling molecule rather than direct inhibitor of fungi.