Solar UVB response of bioactives in strawberry (Fragaria × ananassa Duch. L.): A comparison of protected and open-field cultivation

Melanie Josuttis, Helmut Dietrich, Dieter Treutter, Frank Will, Ludger Linnemannstöns, Erika Krüger

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

Strawberries (Fragaria × ananassa Duch. cvs. Everest, Elsanta) were grown in a tunnel covered with two films, which were distinguished in their ultraviolet transparency, as well as under open-field conditions. One applied film was not transparent for UVB radiation, and the second film transmitted 70% of UVB radiation. During the present study, the nutritional value and quality parameters of the fruits were evaluated. Strawberries were UV-unresponsive in view of the content of ascorbic acid and sum parameters like total anthocyanins and antioxidant capacity measured with TEAC (trolox equivalent antioxidant capacity), ORAC (oxygen radical absorbance capacity) and total phenols. These parameters were mainly affected by sampling date and cultivar. However, HPLC analysis showed that individual phenolics were affected in the absence of UV radiation. The content of the anthocyanin cyanidin 3-glucoside and the flavonols quercetin 3-glucuronide and kaempferol 3-glucoside was decreased in the fruits grown under UV blocking film compared to open-field grown strawberries. By means of the UV transparent film the content of the mentioned flavonoids could be enhanced up to similar amounts like in open-field grown strawberries. All other phenolics were not consistently affected by UV radiation. This result was independent of cultivar.

Original languageEnglish
Pages (from-to)12692-12702
Number of pages11
JournalJournal of agricultural and food chemistry
Volume58
Issue number24
DOIs
StatePublished - 22 Dec 2010

Keywords

  • ORAC
  • Strawberries
  • TEAC
  • UV radiation
  • anthocyanins
  • antioxidant
  • ascorbic acid
  • cultivation
  • flavonoids
  • total phenols

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