Induction and Identification of Homologous Octoploid in Pogostemon cablin (Blanco) Benth. Effects of exogenous salicylic acid on seed germination and seedling growth of Pogostemon cablin under salt stress Isolation of pathogenic Ralstonia solanacearum from Pogostemon cablin and determination of its pathogenicity Analysis of volatile oil of Pogostemon cablin Analysis on defense-related enzyme isozymes in Pogostemon cablin induced by Ralstonia solanacearum Analysis on defense-related enzyme isozymes in Pogostemon cablin induced by Ralstonia solanacearum