Solar ultraviolet-B radiation increases phenolic content and ferric reducing antioxidant power in Avena sativa

Christopher T. Ruhland, Mitchell J. Fogal, Christopher R. Buyarski, Matthew A. Krna

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

We examined the influence of solar ultraviolet-B radiation (UV-B; 280-320 nm) on the maximum photochemical efficiency of photosystem II (F v/Fv), bulk-soluble phenolic concentrations, ferric-reducing antioxidant power (FRAP) and growth of Avena sativa. Treatments involved placing filters on frames over potted plants that reduced levels of biologically effective UV-B by either 71% (reduced UV-B) or by 19% (near-ambient UV-B) over the 52 day experiment (04 July - 25 August 2002). Plants growing under near-ambient UV-B had 38% less total biomass than those under reduced UV-B. The reduction in biomass was mainly the result of a 24% lower leaf elongation rate, resulting in shorter leaves and less total leaf area than plants under reduced UV-B. In addition, plants growing under near-ambient UV-B had up to 17% lower Fv/Fm values early in the experiment, and this effect declined with plant age. Concentrations of bulk-soluble phenolics and FRAP values were 17 and 24% higher under near-ambient UV-B than under reduced UV-B, respectively. There was a positive relationship between bulk-soluble phenolic concentrations and FRAP values. There were no UV-B effects on concentrations of carotenoids (carotenes + xanthophylls).

Original languageEnglish (US)
Pages (from-to)1220-1232
Number of pages13
JournalMolecules
Volume12
Issue number6
DOIs
StatePublished - Jun 2007

Keywords

  • Antioxidant activity
  • FRAP
  • Flavonoids
  • Total phenols
  • UV-B

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