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Effect of the temperature and the exclusion of UVB radiation on the phenolics and iridoids in Menyanthes trifoliata L. leaves in the subarctic |
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| Authors: | Françoise Martz Minna Turunen Riitta Julkunen-Tiitto Marja-Liisa Sutinen |
| Institution: | a Arctic Centre, University of Lapland, POB 122, FI-96101 Rovaniemi, Finland b Finnish Forest Research Institute, Rovaniemi Research Unit, POB 16, FI-96301 Rovaniemi, Finland c Natural Product Research Laboratories, Faculty of Biosciences, University of Joensuu, POB 111, FI-80101 Joensuu, Finland d Arctic Research Centre, Finnish Meteorological Institute (FMI-ARC), Tähteläntie, 62, FI-99600 Sodankylä, Finland e Department of Biology, University of Oulu, POB 3000, FI-90014 University of Oulu, Finland |
| Abstract: | The long-term effects of UVB exclusion and temperature on the methanol extractable (ME) phenolics (flavonoids, phenolic acids) and iridoids of Menyanthes trifoliata L. (Mt) leaves were studied in northern Finland (68°N) using wooden frames covered with filters for UVB exclusion (polyester filter), control (cellulose acetate filter) and ambient (no filter) conditions. Analysis of ambient plots showed no effect of the daily mean temperature (2σ = 1.58 °C) on the leaf ME compound content and composition, but minimum temperatures decreased the flavonol content. UVB exclusion did not affect the total ME compound content but significantly decreased the proportion of flavonols concomitantly with an increase in iridoids. Due to its high iridoid content, Mt appears as an interesting model plant for studying the iridoid biosynthesis and its regulation under stress conditions. |
| Keywords: | Menyanthes trifoliata L Phenolics Flavonol Iridoid UVB radiation Subarctic |
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