The verification of the capacity to induce phytoalexins from the biological activity of plant species may represent a potential way to control diseases in crops. This research studied the induction of phytoalexins in cotyledons of Soybean and Sorghum mesocotyles from crude aqueous extracts (CAEs) and tinctures of plants of medicinal and forest species. The species used were the medicinal plants Ruta graveolens, Baccharis trimera and Origanum majorana. The results showed that CAEs are efficient in the induction of phytoalexins in cotyledons of soybean. , while CAEs of medicinal plants Baccharis trimera and Origanum majorana induce phytoalexin production in high concentrations (15, 20, 25 and 50%). Tinctures are able of inducing the production of phytoalexin in concentrations of 10 and 15% in Soybean cotyledons; however, they are not able to induce the accumulation of phytoalexins in Sorghum mesocotyles.
Gliceollin; deoxyanthocyanidin; crude aqueous extract; tincture
