Abstract
The profile of volatile organic compounds, the glandular and non-glandular trichomes of Plectranthus ornatus, obtained by in vitro cultivation, was evaluated in plants grown in Murashide and Skoog medium supplemented with benylaminopurine at 4.5, 9.0, and 18.0 μM + naphthaleneacetic acid at 5.37 μM, kinetin at 4.7, 9.3 and 18.5 μM + naphthaleneacetic acid (5.37 μM) or Murashide and Skoog 0 medium (as a control). Scanning Electron Microscopy was performed on samples of the third leaf node of the 90 days old plants obtained from treatment with 4.5 or 9.0 μM benylaminopurine, and 4.7 or 9.3 μM kinetin. Headspace Solid Phase Micro-Extraction of the 30, 60 and 90 days old in vitro plants permitted to determinate by GC/MS the composition comprised of 62 compounds. The data were analyzed using Principal Component Analysis and Hierarchical Clustering Analysis and, the major constituents of these oils after treatment and aging were monoterpenes and sesquiterpenes. Morphoanatomical analysis of trichomes, by Scanning Electron Microscopy, enabled the identification of non-glandular trichomes and four types of glandular trichomes, which comprised capitate and peltate glandular trichomes that were distributed on both sides of the leaf. We observed that the regulators influenced qualitative and quantitative profiles of the volatile organic compounds and the number and distribution of hairs on the leaf surface.
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HCP-S was encharged of the in vitro cultivation and SEM analysis. JPD was the supervisor and deal with data analysis and discussion and writing. JRFS and MCB were the responsibles for all the in vitro cultivation and micropropagation supervising. JMD contributed with chemical analysis and critical reading. FMR and PRRM did the HSPM extractions and GC analysis. FSO worked with PCA and HCA analysis.
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Passinho-Soares, H.C., David, J.P., de Santana, J.R.F. et al. Influence of growth regulators on distribution of trichomes and the production of volatiles in micropropagated plants of Plectranthus ornatus. Rev. Bras. Farmacogn. 27, 679–680 (2017). https://doi.org/10.1016/j.bjp.2017.10.001
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DOI: https://doi.org/10.1016/j.bjp.2017.10.001