Post‐flowering photoperiod has marked effects on fruit chemical composition in red raspberry (Rubus idaeus) |
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| Authors: | SP Mazur A Sønsteby A‐B Wold A Foito S Freitag S Verrall S Conner D Stewart OM Heide |
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| Institution: | 1. Bioforsk, Norwegian Institute for Agricultural and Environmental Research, , Kapp, Norway;2. Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, , ?s, Norway;3. Environment and Biochemical Sciences, James Hutton Institute, , Dundee, UK;4. Information and Computational Sciences, James Hutton Institute, , Dundee, UK;5. Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, , ?s, Norway |
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| Abstract: | The effect of photoperiod on nutritional quality and chemical composition of ‘Glen Ample’ red raspberry has been studied under controlled environment conditions. Long day (LD) conditions during fruit growth and maturation significantly increased fruit concentrations of ascorbic acid, total phenolics, organic acids such as malic, quinic and ellagic acids, as well as the ferric reducing activity power, while reducing the concentrations of soluble solids, sucrose and the sugar/acid ratio. The levels of total anthocyanin and oxalic acid were not significantly affected by photoperiod whereas semi‐quantitative analysis indicated a significant increase in the levels of some ellagitannins. The same responses were found whether LD was established by day‐length extension with low‐intensity light or by night interruption, thus demonstrating that the observed changes in nutritional quality of raspberry fruit was mediated through specific photoperiodic mechanism(s) independently of the daily light energy supply. |
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| Keywords: | Anthocyanins antioxidant capacity ellagic acid fruit quality harvest time metabolite profile organic acids photoperiod polyphenols Rubus idaeus sugars vitamin C |
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