In this study, the effects of salt stress, sodium nitoprusside and hormones applications on some signal molecules [nitric oxide (NO), cyclic guanosine monofosfate (cGMP) and calcium (Ca+2)] of sunflower (Helianthus annuus L. cv. Tarsan-1018) plant leaf were investigated. Helianthus annuss L. cv. TARSAN - 1018 seeds were obtained through the Edirne Thrace Agricultural Research Institute. Seeds were irrigated with culture solution for 5 weeks. At the end of the fifth week salt, sodium nitoprusside and hormone applications were performed with foliar application for 72 hours. At the end of 24th and 72nd hours samples were taken. All of signal molecules of leaf tissues of sunflower (Helianthus annuus L. cv. Tarsan-1018) were determined by using analysis kit. Salt stress, sodium nitroprusside and hormone applications caused an increase in the level of NO. Continuation of the administration of IAA and GA resulted in a decrease in the amount of cGMP and Ca+2. Besides of these, salt stress, sodium nitroprusside and hormone applications provided higher NO, cGMP and Ca+2 levels than the control group. The results showed that there was a synergistic effect between hormones and signaling molecules. It has been observed that the signal molecules were regulated against stress conditions.