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Phytochemical and genetic diversity in Mentha species: assessment, valorization and conservation
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Resumo(s)
Mentha cervina (L.) Opiz and Mentha pulegium L. are medicinal and aromatic plants
traditionally used in Portugal for aromatic and seasoning purposes and in folk medicine,
for treatment of gastric and respiratory problems. Light and scanning electron
microscopy of both species indumentum revealed non-glandular and glandular
trichomes, corresponding to the common arrangement in Lamiaceae. Gas
Chromatography and Gas Chromatography–Mass Spectrometry of both species
essential oils (EOs) showed no chemical polymorphism in populations with different
provenances, in cultivated or in wild growing conditions and at different developmental
stages. All populations EOs belonged to the pulegone chemotype. M. cervina EOs
antibacterial activity was higher than the main components alone, supporting the
hypothesis of a synergistic effect of their different components. The antibacterial
activity was more effective against Escherichia coli and Acinetobacter baumanni,
validating their traditional use. The low levels of genetic diversity and the high
structuring of M. cervina populations, assessed with Inter-simple sequence repeats
markers, were assumed to result from a combination of evolutionary history and its
unique biological traits, such as breeding system, clonal growth, low dispersion capacity
and habitat fragmentation. The results point the necessity of conserving the maximum
possible number of populations and sites for ex situ conservation.
Descrição
Doutoramento em Engenharia Agronómica - Instituto Superior de Agronomia
Palavras-chave
Mentha cervina Mentha pulegium trichomes essential oils GC-MS pulegone genetic diversity ISSRs bioactivity genetic conservation
Contexto Educativo
Citação
Rodrigues, L.S.M. -Phytochemical and genetic diversity in Mentha species: assessment, valorization and conservation. Lisboa: ISA, 2012, 211 p.