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Influence of light intensity on glandular trichome density, gene expression and essential oil of menthol mint (Mentha arvensis L.)
- Souza, Marco Andre A. de, Santos, Leandro A. dos, Brito, Diego M. C. de, Rocha, Joecildo F., Castro, Rosane N., Fernandes, Manlio S., Souza, Sonia R. de
- The Journal of essential oil research 2016 v.28 no.2 pp. 138-145
- Mentha arvensis, acetates, essential oils, gene expression, genes, humans, light intensity, lipid content, menthol, mint, oils, toxicity, trichomes
- The effects of 25, 50, 75 and 100% of light intensity (137, 254, 406 and 543 μmol photons m ⁻² second ⁻¹, respectively) on aspects related to volatile synthesis in menthol mint were investigated. Fresh weight production, glandular trichome density and essential oil content showed a significant linear positive correlation with light intensity. Plants under low light intensity (25%) produced an essential oil with high levels of neomenthol, menthol and menthyl acetate. With 50 and 75% of light intensity plants showed an increase in expression of limonene synthase, limonene hydroxylase, (-)-isopiperitenol dehydrogenase, (+)-pulegone reductase and menthol dehydrogenase genes and an anticipation in oil maturity. With 25% of light intensity plants produced an essential oil with the best commercial profile. However, plants under 100% of light intensity produced more essential oil but with lower levels of menthol and higher levels of pulegone, that can be toxic for humans.