Different levels of irradiance and plant regulators modify the leaf structure and essential oil production of Lippia origanoides H.B.K (Verbenaceae)

The quality and quantity of secondary metabolites produced by plants can be influenced biotic abiotic factors, since the biochemical physiological processes that coordinate synthesis these compounds are these. Plant regulators also interfere with plant growth terpene biosynthesis in aromatic species, which is why they widely used agriculture. Lippia origanoides H.B.K an shrub has glandular trichomes on leaf, secrete accumulate essential oil production culinary seasonings cosmetic pharmaceutical industry. objective this research was to evaluate effects associated different levels light availability L. exposed 100, 50, 35 25% irradiance. increase irradiance treated regulator caused changes structure leaf dry biomass, density content 100% full sun treatment. treatments did not influence chemical profile oil, presented thymol as major component. However, application bioregulators increased demonstrating excellent option for increasing production.   Keywords: Aromatic plant, shading, biorregulador vegetable, anatomy.