INFLUÃNCIA DE GENÃTIPOS, AMBIENTES DE CULTIVO E VARIAÃÃO SAZONAL NO TEOR E COMPOSIÃÃO QUÃMICA DO ÃLEO ESSENCIAL DE Hyptis marrubioides EPLING E SEU EFEITO SOBRE FORMIGAS SAÃVA-LIMÃO / Influence of genotypes, environments of cultivation and seasonal variation in the essential oil content and chemical composition of Hyptis marrubioides Epling and its effect on leaf- cutting ants.

AUTOR(ES)

Priscila Pereira Botrel

DATA DE PUBLICAÇÃO

2009

RESUMO

Essential oil in the genus Hyptis has importance as a source of bioactive constituents, possessing important biological effects such as antimicrobial, cytotoxical and insecticidal activities. Hyptis marrubioides Epl., known popularly as field mint is a plant of medicinal use with activities against gastrointestinal, skin infections, pains and cramps. Research works on medicinal plants are still preferentially turned to the knowledge of species which produce wished phytopharmics, ignoring the genetical, environmental and phytotechnical processes that influence the production of those chemical compounds. In this sense, the purpose of this work was the of evaluate different genotypes and parts of the plant of H. marrubioides, cultivation environment and seasonal variation on the content and chemical composition of essential oil, as well as the insecticidal activity on leaf-cutting ants (Atta sexdens rubropilosa Forel). It was found that the highest essential oil content in H. marrubioides was observed in the inflorescence of the purple genotype and the composition of the essential oil ranged quantitatively among the parts of the plant analyzed and among the genotypes. H. marrubioides plants cultivated in field presented higher essential oil content when compared to those cultured in greenhouse. In the summertime, the leaves of H. marrubioides showed higher essential oil contents and the major compounds in the essential oil were monoterpenoids α-thujone and β-thujone. The topical application of H. marrubioides essential oil presented toxic activity to leaf-cutting ants and the lethal time (LT50) was of 17 hours and 39 minutes at the concentration of 38.34% of essential oil.

ASSUNTO(S)

gas chromatography hortelÃ-do-campo,planta medicinal,Ãleo essencial. medicinal plants fitotecnia field mint

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