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• W2022155135 endingPage "1092" @default.
• W2022155135 startingPage "1092" @default.
• W2022155135 abstract "Exposed and non-exposed halves of field-grown berries of the white grapevine Vitis vinifera L. cv. Pinot Blanc at various stages of ripeness were analysed using chlorophyll fluorescence imaging. The stage of ripeness was classified by the total sugar concentration which ranged between 120 and 300 g L–1 for the different berries but was similar in the exposed and the non-exposed half of individual berries. Fluorescence was excited in the UV-A and the blue spectral region and detected at red as well as far-red wavelengths. At both emission ranges, UV-excited fluorescence was weak and required correction for the contribution of small false signals. After correction, in vivo UV screening by berry skins was derived from the ratio of UV-A to blue-excited fluorescence intensities, and a relationship between in vivo UV screening and flavonol quantity was established: the quantity of flavonols was determined by spectral analysis of extracted phenolics. Significantly high flavonol concentrations, and effective in vivo UV screening, were detected in most exposed half-berries at sugar concentrations higher than 200 g L–1 but not in non-exposed samples. This suggests that radiation-exposure conditions determine flavonol synthesis. Based on the absence of flavonol accumulation in exposed half-berries with sugar concentrations smaller than 200 g L–1, however, it is suggested that berries need to arrive at an advanced stage of ripeness before responding to radiation-exposure by synthesising large amounts of UV-protecting flavonols. Chlorophyll degradation, which was followed by blue-excited intensities of far-red fluorescence, progressed in parallel with increasing sugar content suggesting that chlorophyll degradation is associated with berry ripening. In addition, exposure to sunlight appeared to slightly stimulate chlorophyll decay." @default.
• W2022155135 created "2016-06-24" @default.
• W2022155135 creator A5012868705 @default.
• W2022155135 creator A5047031073 @default.
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• W2022155135 date "2007-01-01" @default.
• W2022155135 modified "2023-09-23" @default.
• W2022155135 title "In vivo assessing flavonols in white grape berries (Vitis vinifera L. cv. Pinot Blanc) of different degrees of ripeness using chlorophyll fluorescence imaging" @default.
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• W2022155135 doi "https://doi.org/10.1071/fp07206" @default.
• W2022155135 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/32689439" @default.
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