Abstract

VALDES OYERVIDES, FJ et al. Ion and salt effects on the productivity and proline accumulation in Lippia gravolens H.B.K. Phyton (B. Aires) [online]. 2012, vol.81, n.2, pp.191-198. ISSN 1851-5657.

Four dynamic conditions to evaluate the effects of stress on production of biomass, essential oils, Tymol, carvacrol and proline accumulation in Lippia graveolens H.B.K. were investigated under greenhouse conditions. A bifactorial design assessed four environmental conditions (factor B): commercial nutritive solution (B0); Water (B1); moderate stress (B2), and intermediate (B3) stress nested under (Factor A) salinity (NaCl) and ion concentration (Cu²⁺) and (Fe²⁺) stresses. Average production of fresh weight and number of leaves were reduced under NaCl and both ion concentration conditions. However, there were no significant differences on average for the four environments. The amounts of essential oils were significantly higher under the stressful environments with Fe²⁺ and Cu²⁺ at both concentrations. The average percentages of Tymol and carvacrol were higher under both study concentrations of Cu²⁺ and Fe²⁺ than under NaCl. The greater values for Tymol and carvacrol were observed under moderate stress intensity. Accumulation of proline was greater in the root than in the foliage. Stressful conditions of ionic elements at both intensities determine greater proline accumulation. High proline accumulation, however, was also observed under non-stressful conditions. A positive correlation (r = 0.997) between production of essential oils and proline accumulation was shown. The stress induced with salinity and ions Cu²⁺ and Fe²⁺ led to a greater accumulation of secondary metabolites.

Keywords : Oregano; Salt; Metals; Tymol; Carvacrol; Proline.

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