UV-B modulates the interplay between terpenoids and flavonoids in peppermint (Mentha x piperita L.)

Journal of Photochemistry and Photobiology. B, Biology
Yuliya DolzhenkoMassimo E Maffei

Abstract

Modulation of secondary metabolites by UV-B involves changes in gene expression, enzyme activity and accumulation of defence metabolites. After exposing peppermint (Mentha x piperita L.) plants grown in field (FP) and in a growth chamber (GCP) to UV-B irradiation, we analysed by qRT-PCR the expression of genes involved in terpenoid biosynthesis and encoding: 1-deoxy-D-xylulose-5-phosphate synthase (Dxs), 2-C-methyl-D-erythritol-2,4-cyclodiphosphate synthase (Mds), isopentenyl diphosphate isomerase (Ippi), geranyl diphosphate synthase (Gpps), (-)-limonene synthase (Ls), (-)-limonene-3-hydroxylase (L3oh), (+)-pulegone reductase (Pr), (-)-menthone reductase (Mr), (+)-menthofuran synthase (Mfs), farnesyl diphosphate synthase (Fpps) and a putative sesquiterpene synthase (S-TPS). GCP always showed a higher terpenoid content with respect to FP. We found that in both FP and GCP, most of these genes were regulated by the UV-B treatment. The amount of most of the essential oil components, which were analysed by gas chromatography-mass spectrometry (GC-MS), was not correlated to gene expression. The total phenol composition was found to be always increased after UV-B irradiation; however, FP always showed a higher phenol content with resp...Continue Reading

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Jan 28, 2015·Food Chemistry·Liza G Riachi, Carlos A B De Maria
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