Chemotaxonomic markers in essential oils of Hypenia (Mart. ex Benth.) R. Harley

Abstract

O Cerrado Central brasileiro é considerado o centro de origem e dispersão de Hypenia (Lamiaceae: subtribo Hyptidineae) na América do Sul. O gênero tem sido mantido sem divisão, ou subdividido em duas ou cinco seções taxonômicas, baseadas quase exclusivamente a partir de um conjunto limitado de características florais. Neste trabalho, uma delimitação química interespecífica é descrita a fim de complementar as análises das características botânicas. Análise multivariada dos óleos essenciais de dez espécies na fase vegetativa suporta a divisão taxonômica do gênero em duas seções. Grupo I incluiu quatro espécies da seção Laxiflorae em adição à H. irregularis, os quais foram caracterizados pelos mais altos percentuais de espatulenol e óxido de cariofileno. Grupo II conteve cinco espécies da seção Densiflorae com a-cadinol, a-muuroleno e a-muurolol como constituintes principais. Cadinanos e germacranos/aromadendranos parecem ser as classes marcadoras quimiotaxonômicas nas seções Densiflorae e Laxiflorae, respectivamente. Além disso, análise de redundância canônica não indicou correlação significante entre fatores edáficos com quimiovariação nos óleos essenciais, sugerindo que em Hypenia os óleos são constituídos por substâncias constitutivas e não induzidas pelo ambiente.Central Brazilian Cerrado is regarded as the center of origin and dispersion of Hypenia (Lamiaceae: subtribe Hyptidineae) in South America. The genus has either remained undivided or been divided into two or seven taxonomic sections, based almost exclusively on a limited range of floral features. Interspecific chemical delimitation to complement analyses of botanical traits is described. Multivariate analysis of essential oils of ten species in the vegetative stage supports the taxonomic division in two sections. Cluster I included four species belonging to section Laxiflorae in addition to H. irregularis, which were characterized by the highest percentages of spathulenol and caryophyllene oxide. Cluster II contained five species belonging to section Densiflorae with a-cadinol, a-muurolene and a-muurolol as major constituents. Cadinanes and germacranes/ aromadendranes seem to be chemotaxonomic markers of sections Densiflorae and Laxiflorae, respectively. Furthermore, redundancy analysis revealed no significant correlation between edaphic factors and oil chemovariations, suggesting that Hypenia oils consist of constitutive rather than induced compounds.

Taxonomic Insights and Its Type Cyclization Correlation of Volatile Sesquiterpenes in Vitex Species and Potential Source Insecticidal Compounds: A Review

“…In the phylogenetic study by [202], Neptododeae belongs to a clade very close to Vitcoideae, evidencing a genetic proximity between these subfamilies. Interestingly, aromadrendadanes were proposed as chemotaxonomic markers for the genera Marsypianthes and Hypenia, which belong to Neptododeae [203,204]. Therefore, it is suggested that sesquiterpene synthases and their cyclization mechanism for the formation of aromadrendanes may be correlated with this proximity of the clades, indicating a conserved base of genes among these subfamilies, constituting an interesting approach that can help in the development of a better understanding of the taxonomy of the family Lamiaceae.…”

Chemical composition of the essential oil of Hypenia helenoi M.T. Faria

“…R. Harley showed trypanocidal activity (SOUZA et al, 2017). Other studies have associated the influence of phenology and infrageneric levels on essential oil variations by multivariate analyses (FARIA et al, 2012;JESUS et al, 2022;SILVA et al, 2011). This article presents the results of the essential oil composition of H. helenoi by gas chromatography coupled with mass spectrometry (GC/MS).…”