Se-acquisition and reactive oxygen species role in growth, photosynthesis, photosynthetic pigments, and biochemical changes in essential oil(s) monoterpene of Geranium (Pelargonium graveolens L.Her.’ ex. Ait.)

Se is an essential element required for various metabolic pathways and act as an antioxidant in the various redox-reactions of primary and secondary plant production of – biomolecules. Geranium is an important essential monoterpene oil(s) bearing plant. Culturing the plant at different doses of Se from 0-1.0 mg Se ml-1 revealed that Se plays an important role as an in antioxidant promoter, apart from its micronutrient essentiality. 0.25 mg Se ml-1 is the critical concentrations for maximum content of (0.21%) total essential monoterpene oil(s). At concentration below and above 0.25 mg Se ml-1, the CO2 assimilation rate, photosynthetic pigments content and ultimately the accumulation of essential monoterpene oil(s) are affected. The maximum peroxidase and SOD activities were obtained at 0.25 mg Se ml-1, with the production of biomolecule geraniol. Results revealed an oxido-reducable reaction of Se in the formation of monoterpene essential oil(s) and possibly for the major constituents Geraniol.