title: Influence of Controlled Postflowering Temperature and Daylength on Individual Phenolic Compounds in Four Black Currant Cultivars.
abstract: The effects of postflowering temperature and daylength on the concentration of individual phenolic compounds were studied in black currant (Ribes nigrum L.) berries under controlled phytotron conditions. The four cultivars studied varied greatly in their concentrations of individual phenolic compounds and temperature stability for accumulation. The concentrations of a wide range of identified phenolic compounds were strongly influenced by temperature over the 12-24 °C range, often with opposite temperature gradient patterns for compounds within the same subclass. Accumulation of anthocyanins and flavonols increased under natural long day conditions, which provided an increased daily light integral, while under identical light energy conditions, photoperiod had little or no effect on the concentration of phenolic compounds. Furthermore, with the exception of members of the hydroxycinnamic acid subclass, the concentration of most phenolic compounds was higher in berries ripened outdoors than in the phytotron, apparently due to screening of UV-B radiation by the glass cover.
authors.affiliation: Department of Plant Sciences, Norwegian University of Life Sciences , NO-1432 Ås, Akershus, Norway.
authors.forename: Tomasz L
authors.initials: TL
authors.lastname: Woznicki
authors.affiliation: Nofima, Norwegian Institute of Food, Fisheries and Aquaculture Research , NO-1430 Ås, Akershus, Norway.
authors.forename: Kjersti
authors.initials: K
authors.lastname: Aaby
authors.affiliation: NIBIO, Norwegian Institute for Bioeconomy Research , NO-1431 Ås, Akershus, Norway.
authors.forename: Anita
authors.initials: A
authors.lastname: Sønsteby
authors.affiliation: Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences , NO-1432 Ås, Akershus, Norway.
authors.forename: Ola M
authors.initials: OM
authors.lastname: Heide
authors.affiliation: Department of Plant Sciences, Norwegian University of Life Sciences , NO-1432 Ås, Akershus, Norway.
authors.forename: Anne-Berit
authors.initials: AB
authors.lastname: Wold
authors.affiliation: Department of Plant Sciences, Norwegian University of Life Sciences , NO-1432 Ås, Akershus, Norway.
authors.forename: Siv F
authors.initials: SF
authors.lastname: Remberg
mesh_terms: D035264:Flowers / Q000737:chemistry / Q000254:growth & development / Q000528:radiation effects; D005638:Fruit / Q000737:chemistry / Q000254:growth & development / Q000528:radiation effects; D008027:Light; D019800:Phenol / Q000737:chemistry*; D010936:Plant Extracts / Q000737:chemistry*; D031965:Ribes / Q000737:chemistry* / Q000254:growth & development / Q000528:radiation effects; D012621:Seasons; D013696:Temperature
chemical_list: D010936:Plant Extracts; D019800:Phenol
keywords: Ribes nigrum; anthocyanins; black currant; climate; flavonols; hydroxycinnamic acids; light integral; photoperiod; temperature