Volatile components variation in the Teucrium marum complex (Lamiaceae) from the Balearic Islands

Abstract

The volatile compounds of 18 samples from the western Balearic Islands belonging to three taxa of the Tmcrium marum L. complex (7: marum subsp. marum, 7: marum subsp. ocdmtub and I: marum subsp. dmsocabx) were fractionated by distillation-extraction and analysed by means of GC-MS. Seventeen components were characterized and the quantitative data were subjected to multivariate and clustering techniques. Two main groups appeared, one comprising I: marum subsp. occidmtuk samples and the other grouping I: marum subsp. marum and 7: marum subsp. dmsocahx accessions. Chemical data and taxonomic groupings generally agreed, but quantitative and qualitative differences within and between taxa were found. Specimens from Minorca and Cabrera islands showing intermediate morphological features between I: marum subsp. marum and I: marum subsp. ocdmtak were included within the TT: marum subsp. marum-I: marum subsp. dmsocabx group in the Principal Component Analysis. The origin of these intermediate specimens is discussed, and it is suggested that they are local variants of I: marum subsp. marum which had an independent origin throughout its area.8 2Mx) The Linnean Society of London ADDITIONAL KEY WORDS:-chemotaxonomyendemic plantsinfraspecific variation western Mediterranean.

Characterization of Essential Oils from Different Taxa Belonging to the Genus Teucrium in Sardinia Island, Italy

“…Recently, this taxon was described as endemic to south-western Sardinia and Majorca [ 25 ]. Our results, as well as previous phytochemical reports analyzing the EOs from T. marum and T. subspinosum gathered in Sardinia and the Balearic Islands [ 43 , 44 ], were not conclusive and they corroborated the remarkable affinity between the two entities. Differently from what was observed in the volatile fraction, the ethanol extract showed significant differences in the phenylpropanoid glycosides content, suggesting these compounds as markers of these taxa [ 4 ].…”

“…This species, known as “cat thyme” or “mint plant”, was previously studied revealing a high variability in the EO composition. Samples originated from Balearic Island were characterized by a high percentage of dolichodial, an iridoid identified in both the organic solvent extracts and simultaneous distillation–extraction [ 43 , 44 ]. This compound exerts insecticidal activity and may represent a plant defensive agent [ 45 ].…”

Biological Activity and Characterization of Volatile Compounds ofTeucrium orientaleVar.glabrescensby SPME and GC-FID/MS

“…) and T. marum (Sanz et al . ). To our knowledge, there is limited report on the essential oil analysis of Teucrium orientale L. var.…”

Phytochemical diversity within and among Sardinian populations of the endemic Teucrium marum L. (Lamiaceae) is determined by ecological factors

“…To avoid the singularity of the volatile compounds being influenced by the sampling period and different extraction methods, compared with other reports [ 5 , 30 , [38] , [39] , [40] , 57 , 58 ], field sampling was carried out over a short period of time during the flowering stage, and a standard extraction method for EOs was used [ 5 ].…”