| Autor: |
Sadgrove NJ; Jodrell Science Laboratory, Royal Botanic Gardens Kew, Richmond TW9 3DS, UK., Padilla-González GF; Jodrell Science Laboratory, Royal Botanic Gardens Kew, Richmond TW9 3DS, UK., Telford IRH; Botany and N.C.W. Beadle Herbarium, School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia., Greatrex BW; School of Science and Technology and School of Rural Medicine, University of New England, Armidale, NSW 2351, Australia., Jones GL; School of Science and Technology and School of Rural Medicine, University of New England, Armidale, NSW 2351, Australia., Andrew R; Ecosystem Management, School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia., Bruhl JJ; Botany and N.C.W. Beadle Herbarium, School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia., Langat MK; Jodrell Science Laboratory, Royal Botanic Gardens Kew, Richmond TW9 3DS, UK., Melnikovova I; Department of Crop Sciences and Agroforestry, Faculty of Tropical AgriSciences, Czech University of Life Sciences Prague, Kamýcká 129, 16500 Prague, Czech Republic., Fernandez-Cusimamani E; Department of Crop Sciences and Agroforestry, Faculty of Tropical AgriSciences, Czech University of Life Sciences Prague, Kamýcká 129, 16500 Prague, Czech Republic. |
| Abstrakt: |
The highly aromatic Australian mint bushes from the genus Prostanthera Labill. produce a high yield of essential oil on hydrodistillation. Together with its rich history, horticultural potential, iconic flowers, and aromatic leaves, it achieves high ornamental and culinary value. Species in the genus express highly diverse and chemically unique essential oils that demonstrate intra- and inter-specific patterns that have inspired taxonomic reinterpretation for over a hundred years. Previous studies have conveyed that phenoplastic expression of volatiles creates chemotypes within taxa, adding complexity to chemophenetic exploration. The current study chemically characterised essential oils from 64 highly aromatic specimens, representative of 25 taxa, giving yields as high as >2% g/g. The chemical profiles of essential oils are diverse, but generally include 1,8-cineole and signatory compounds such as sesquiterpene oxides, caryophyllene oxide, kessane and cis-dihydroagarofuran; sesquiterpene alcohols, globulol, epiglobulol, maaliol, prostantherol, spathulenol and ledol; and monoterpene derivatives of common scaffolds, borneol, bornyl acetate, bornanone, linalool and linalyl acetate. As in previous studies, analysis of chemical data confirms that the chemistry strongly agrees with taxonomic classifications. Importantly, as in classical taxonomy, the current chemical study complemented morphological analysis but conveys chemovariation, obscuring the taxonomic agreement. Nevertheless, variation within taxa may be due to environmental factors, meaning that cultivation of species in gardens will create different chemical profiles as compared to those published here. |
