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Abstracts - Valéria M.M. Gimenez

Type of the Presentation: Poster

FLAVONOID AND TRITERPENES AS INDICATORS OF GEOGRAPHIC AND CLIMATIC VARIATION IN M. albicans AND M. chamissois IN THE CERRADO OF SÃO PAULO

Valéria M.M. Gimenez1, Wilson R. Cunha1, Ana Helena Januário1, Márcio L. Andrade e Silva1, Ernane José Xavier da Costa2, Patrícia M. Pauletti1.

1University of Franca, São Paulo, Brazil; vmmgimenez@yahoo.com.br, wilson.cunha@unifran.edu.br, ana.januario@unifran.edu.br, marcio.silva@unifran.edu.br, patricia.pauletti@unifran.edu.br,

2University of São Paulo, São Paulo, Brazil; ernane@usp.br.

In Brazil, a great biodiversity of plants and biomes is recognized. Melastomataceae is a typical Neotropical family with high distribution in the Cerrado, one of the main Brazilian biomes and one of the 34 hotspots worldwide for conservation. Studies with Miconia, a major genus, show antibiotic, antitumor, analgesic, antimicrobial and antimalarial uses, as well as being of ecological and agronomic interest. The production of secondary metabolites can be affected by a variety of factors such as genetics, age, seasonality, nutrient level, osmotic stress and photoperiodic. In natura, there are large differences among populations with a high inbreeding index, and this fact may be related to the distribution, origin and mechanics of interaction among chemotypes and co-evolution with others species, recurrent polymorphism of mutations and to genetics drift1. The present study looked for chemical indicators in Miconia albicans and Miconia chamissois as related to a study on the distribution of species in the Cerrado of São Paulo state. The fingerprints of the flavonoid contents were perfomeded: rutin, quercetin, miconoside B and Matteucinol-7-O-β-D-apiofuranosyl(1 6)-β-D-glucopyranoside; and the triterpenoids – oleanolic and ursolic acids of these species between three areas of the Cerrado and two climatic seasons (dry and rainy), using high performance liquid chromatography coupled with analysis of the diode array detector (HPLC-DAD). The results suggest inter and intra-specific variation. There is seasonal variation in the production of secondary metabolites. The triterpenoid contents were higher in M. chamissois and then decreased in the rainy season of the year. Flavonoids are predominant in M. albicans and their concentration increase in the rainy season, besides showing the smallest detection limit (LOD). The selected compounds are possible chemical markers of Miconia.

Refs.

1. Nehme, C.J. e al., Biochemical Systematics and Ecology. 36: 602-611, 2008.