Atividade alelopática de Copaifera langsdorffii DESF: abordagem fitoquímica e molecular

• Ano de defesa: 2013
• Autor(a) principal: Franco, Danilo Miralha [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Fisiologia vegetal; Alelopatia; Biologia molecular; Expressão gênica; Copaíba; Acido ribonucleico; Plant physiology
• Link de acesso: http://hdl.handle.net/11449/108624

The environmental conditions in the Cerrado, like drought and solar incidence, collaborate to diverse chemical laboratory that synthesizes and selects compounds produced by these plants. The seasonal contrast in the Cerrado vegetation types between dry and wet season is one of the factors that can alter the concentrations of secondary metabolites in plants. The compounds produced by secondary metabolism can be phenylpropanoids, terpenes, alkaloids and steroids that have biological activity and are responsible for the chemical interaction between plants. The allelochemicals are mediators of chemical communication between plants and mechanisms of action are related to numerous biochemical and physiological processes regulated by different sets of genes. Specific genes whose expression is controlled by microRNAs and other regulatory RNAs regulate several biological processes related to plant development. The use of molecular biology may elucidate the mechanisms of action responsible for phytotoxic physiological responses involved in allelopathic activity and show new targets in biochemical and physiological allelopathy. The evaluation of the allelopathic activity of enriched fractions of extracts and pure compounds with known allelopathic activity may elucidate mechanisms of action and effects at the molecular level associated with physiological pathways affected. The objective of this study was to evaluate the chemical profile and allelopathic potential of organic extracts of leaves collected Copaifera langsdorffii in dry and wet seasons. Therefore, we checked the germination speed index (GSI), root growth and the pattern of gene expression [SHORT- ROOT (SHR); miRNA166; FT HOMEODOMAIN LEUCINE ZIPPER (HD ZIP III) with genes REVOLUTA (REV), PHABULOSA (PHB) e PHAVOLUTA (PHV)] and phenotypic characteristics of seedlings of Sorghum bicolor. A comparison of phytochemical profile observed in the chromatograms indicates no qualitative changes in ...