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Análises morfoanatômicas e do óleo essencial de quatro espécies de Aldama La Llave (Asteraceae : Heliantheae)

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Arinawa Liz Filartiga
Total Authors: 1
Document type: Doctoral Thesis
Institution: Universidade Estadual de Campinas, Instituto de Biologia
Defense date:

Asteraceae is considered one of the largest families among the eudicots, representing about 10% of the world's flora. The success of this family in different ecosystems is related to the diversity of life forms, methods of propagation and production of bioactive metabolites. Among the 1600-2000 genera within the family, Aldama La Llave consists of 112 South American species, of which 35 occur in Brazil. The most recent phylogenetic analysis for the group was held in 2011, however was considered to be inconsistent due to the low statistical support of the branches of the Brazilian species. Thereafter, many efforts have been applied to obtain new data that may assist in the phylogeny and taxonomy of the group. For this reason, this work investigates Aldama species, with an emphasis on A. anchusifolia, megapotamica A., nudibasilaris and A. pilosa, of which have a close relationship. The analyzes focus on morphoanatomy, and phytochemical profile of essential oils of vegetative above and belowground organs, seeking (i) to find new characters with diagnostic value; (ii) to highlight potential chemical markers; (iii) to characterize the peculiarities of belowground organs and its regrowth capacity. For structural and histochemical analyzes, samples of aerial organs (leaf and stem) and underground organs (stems and roots) were processed according to the usual techniques for plant anatomy. For phytochemical analysis, essential oils were analyzed by gas chromatography and spectrometry. Morphoanatomical analysis allowed the identification of a unique set of anatomical features to leaves and aerial stems of each species. Furthermore, it was observed that the number and positioning of the secretory ducts in the midrib are variable and must be used carefully for distinguishing between species. For the underground stems were identified two new features related to the development of extensions and to the storing of fructans, of which differ from the features already reported to Aldama. The detailed analysis of the belowground organs also improved the knowledge of its bud bank. The chemical profile of essential oils showed the presence of a unique set of terpenes to each species. The data obtained in this study represent a significant contribution to the knowledge of Aldama species, as provided information with the potential to assist species distinction, as well as new aspects of the group, of which will be useful for future research in different botany areas (AU)

FAPESP's process: 12/02476-0 - Morpho-anatomical and essential oil analysis of four species of Aldama la Llave (Asteraceae: Heliantheae)
Grantee:Arinawa Liz del Prado Filartiga
Support type: Scholarships in Brazil - Doctorate