In vitro propagacija i biološka aktivnost metanolnih ekstrakata i etarskog ulja povratiča (Tanacetum vulgare L.)
In vitro propagation and biological activity of essential oil and methanol extracts of tansy (Tanacetum vulgare L.)
Doctoral thesis (Published version)
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Many aromatic, medicinal and ornamental species rich in biologically active secondary metabolites belong to the genus Tanacetum. Tanacetum vulgare L. (syn. Chrysanthemum vulgare L., tansy) is a perennial, herbaceous plant originating in Europe and Central Asia, commonly encountered along roads, stripes, pastures, fields, and coastal areas. In Serbia, this species is part of the ruderal flora. The research subject of this dissertation was the phytochemical characterization of the composition and biological activities of T. vulgare essential oil and methanol extracts. In vitro culture of T. vulgare was successfully established from seeds of plants harvested in nature. Shoot cultures have been successfully maintained and multiplied on the nutrient medium enriched with 6-benziaminopurine (BAP); for needs of rooting, BAP was replaced with indole buteric-acid (IBA). The root in vitro cultures were maintained in a liquid nutrient medium supplemented with IBA which influenced the increase in the biomass of cultivated roots during subcultures. Histological analysis of secretory structures of in vitro plantlets showed presence of biseriate glandular trichomes with detected lipids, terpenes and alkaloids as secretory content,, both on the leaves and the stalk. The chemical analysis of methanol extracts of T. vulgare herb and roots indicated that the extracts of in vitro cultivated plants were qualitatively poorer than methanol extracts of plants harvested in nature, but the extracts isolated from in vitro plants were characterized by several times higher presence of certain compounds, primarily 3,5-O-dicaffeoylquinic acid. The most common compounds were phenolic acids from the derivatives of cinnamic acid group, such as neohlorogenic, 3,5-O-dicaffeoylquinic,and dicaffeoylquinic acid. In addition, 17 flavonoids were detected. The relative proportion of phenolic acids and flavanoids differed depending on the part of the plant used to prepare the methanol extract. Comparative analysis of the chemical composition of the volatile components in essential oil of T. vulgare collected from the natural habitat and in vitro cultured plants has also shown great differences in the composition both of individual and entire groups of compounds. In the plants harvested in nature, GC/MS analysis showed that the dominant components belonged to the group of oxidized monoterpenes, with the most prevalent compounds of trans-chrysanthenyl acetate, trans-chryzanthenol, trans-thujone and cisthujone. On the other hand, the essential oil obtained from in vitro grown T. vulgare plants was characterized by a uniform presence of monoterpenes and sesquiterpens. All monoterpenes identified in in vitro plantlets were also present in essential oil of plants collected from nature, on the other hand, sesquiterpene compounds were more diverse and more represent in in vitro plants. Essential oil and methanol extracts isolated from plants harvested from natural habitat were used to analyze the biological activities of the T. vulgare secondary metabolism compounds. The results showed that all the analyzed methanol extracts exhibited a significant antioxidant activity that correlated with the total phenol content in the extracts. The root extract showed the highest antioxidant capacity, containing thehighest amount oftotal phenols, with the maximum relative content of neochlorogenic, dicaffeoylquinic, and dicaffeoylquinic acids compared to other extracts. The essential oil and methanol extracts of T. vulgare flowers, leaves, stalks and roots exhibited significant antimicrobial activity tested on 8 bacterial and 6 micromycetes species. T. vulgare essential oil exhibited a strong antimicrobial effect on most bacterial strains (5 of the 8 analyzed) and all strains of micromycetes. On the other hand, methanol extracts of T. vulgare roots, leaves, flowers and stalks exhibited strong activity on all tested bacterial species and most of the micromycetes. In most cases the effects of the tested extracts were at the level of the effects of the reference antibiotics and antimycotics used as positive controls, so both essential oil and methanol extracts of T. vulgare can be recommended in the prevention and treatment of infections caused by species on which high activity is shown and also as preserving agents in the food industry. In further research, the cytotoxic potential of essential oil and methanol extracts on human cervical adenocarcinoma (HeLa) cells was investigated. To determine the level of selective effect, the activity on healthy human cell lines of fetal lung fibroblasts (MRC-5) was also studied. In vitro results showed that the essential oil exhibited the weakest cytotoxicity while methanol extracts of the stalk and root showed poor cytotoxic action on the target cells relative to the methanol extracts of leaf and flower. The most of HeLa cells exhibited loss of adhesion after leaf and flower methanol extracts treatment, also shrinking of membrane and rounding of cells were observed, indicating cell death. Monitoring the effects of T. vulgare essential oil on gypsy moth (Lymantria dispar L.) larvae showed that this essential oil did not exhibit acute toxicity to the caterpillar of the second developmental stage , but caused a delay in the coating and a significant reduction in the percentage of coated caterpillars. Ingestion of essential oil influenced on the other parameters of growth and development observed in the fourth stage of caterpillar development. The essential oil reduced the daily increment of the mass of caterpillars of the fourth developmental stage as well as the rate of food consumption. Although the essential oil influenced the reduction in the conversion of digested food into the caterpillar biomass, this reduction did not appear to be statistically significant. Hence, it can be concluded that the negative effect of essential oil on ingestion was reduced and that reduced intake of food was partially compensated. In order to investigate the potential of T. vulgare essential oil to induce the mechanisms of defense of in vitro grown potato plants (grown in an atmosphere filled with volatile components of this oil), the expression of 4 genes involved in the mechanisms of defense against pathogens and herbivore insects was analyzed. The presence of essential oil induced intense induction of two analyzed PR (pathogenesisrelated) genes, PR-2 and PR-5. The first changes in expression were observed after 8 hours of exposure, and the maximum increase of expression of about 50 times was recorded for the PR-2 gene after 12 h. Based on the preliminary PTR-MS analysis and measurements of the representation of individual essential oil compounds in the atmosphere in jars where the potatoes were grown, the dominant compounds were the monoterpen hydrocarbons α-pinene and pcymene. Beside these compounds, artemisia-ketone, cis-thujone, trans-thujone and camphor were highly represented, suggesting that these groups of compounds might be responsible for induction of potato defenses.
Keywords:Tanacetum vulgare L.; In vitro culture; Essential oil; Methanol extracts; Antimicrobial activity; Cytotoxic activity; Insecticidal activity; Induction of defense mechanisms
Source:University of Belgrade, Faculty of Biology, 2017, 1-233