Solar Ultraviolet-B Radiation Increases Phenolic Content and Ferric Reducing Antioxidant Power in Avena sativaReportar como inadecuado


Solar Ultraviolet-B Radiation Increases Phenolic Content and Ferric Reducing Antioxidant Power in Avena sativa


Solar Ultraviolet-B Radiation Increases Phenolic Content and Ferric Reducing Antioxidant Power in Avena sativa - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Department of Biological Sciences, TS-242 Trafton Sciences Center, Minnesota State University, Mankato, MN 56001, USA





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Abstract We examined the influence of solar ultraviolet-B radiation UV-B; 280-320 nm on the maximum photochemical efficiency of photosystem II Fv-Fm, 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. View Full-Text

Keywords: antioxidant activity; flavonoids; FRAP; total phenols; UV-B antioxidant activity; flavonoids; FRAP; total phenols; UV-B





Autor: Christopher T. Ruhland * , Mitchell J. Fogal, Christopher R. Buyarski and Matthew A. Krna

Fuente: http://mdpi.com/



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