Abstract
The aim of this research was to determine the effect of development and UV-B on flavonols and the regulation of gene activity in Vitis vinifera L. var. Sauvignon blanc grapes. Particular emphasis was placed on gene activity associated with the low and high fluence UV-B responses. Flavonols, particularly quercetin and kaempferol glycosides, increased substantially upon fruit exposure due to UV-B, with spatial analysis locating the changes to the berry skin. Of five VvFLS genes in grapes, two (VvFLS4 and 5) were found to be transcriptionally active, with VvFLS4 also being responsive to UV-B but VvFLS5 was not. Of the transcription factors known to regulate FLS (VvMYB12, VvMYCA1 and VvWDRs), only VvMYB12 was found to be responsive to UV-B. A number of candidate genes associated with the low and high UV-B fluence responses were also studied (VvUVR8, VvHY5, VvCOP1 and VvCHS; PR genes and VvMAPK3; respectively). The genes associated with the low fluence response exhibited transcriptional regulation in line with reports from other species, while the PR genes and VvMAPK3 only appeared to be responsive in a high UV-B fluence environment. Together, these data supports the view flavonol biosynthesis in grape is stimulated predominantly through the low fluence UV-B response pathway.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
UV-B exposure substantially increased berry flavonols, especially quercetin and kaempferol glycosides, in the skin.
- Organ / stage
- berry skine0
- Treatment
- UV-Be0
- Outcome
- Flavonols, particularly quercetin and kaempferol glycosidese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Flavonols, particularly quercetin and kaempferol glycosides, increased substantially upon fruit exposure due to UV-B, with spatial analysis locating the changes to the berry skin.”
e1“Vitis vinifera L. var. Sauvignon blanc grapes”
Claim · model-written summary
VvFLS4 and VvFLS5 were transcriptionally active among five grape VvFLS genes.
Verbatim
e0“Of five VvFLS genes in grapes, two (VvFLS4 and 5) were found to be transcriptionally active”
e1“Vitis vinifera L. var. Sauvignon blanc grapes”
Claim · model-written summary
VvFLS4 responded transcriptionally to UV-B.
Not reportedComparator
Verbatim
e0“with VvFLS4 also being responsive to UV-B but VvFLS5 was not.”
e1“Vitis vinifera L. var. Sauvignon blanc grapes”
Claim · model-written summary
VvFLS5 was not responsive to UV-B.
Not reportedComparator
Verbatim
e0“with VvFLS4 also being responsive to UV-B but VvFLS5 was not.”
e1“Vitis vinifera L. var. Sauvignon blanc grapes”
Claim · model-written summary
Among the listed FLS transcription factors, only VvMYB12 responded to UV-B.
Not reportedTaxon
Verbatim
e0“Of the transcription factors known to regulate FLS (VvMYB12, VvMYCA1 and VvWDRs), only VvMYB12 was found to be responsive to UV-B.”
Claim · model-written summary
Low-fluence UV-B response genes showed transcriptional regulation consistent with other species.
Not reportedTaxon
Verbatim
e0“The genes associated with the low fluence response exhibited transcriptional regulation in line with reports from other species”
Claim · model-written summary
PR genes and VvMAPK3 appeared responsive only under high UV-B fluence.
Not reportedTaxonComparator
Verbatim
e0“while the PR genes and VvMAPK3 only appeared to be responsive in a high UV-B fluence environment.”
Claim · model-written summary
The authors infer that low-fluence UV-B responses predominantly stimulate grape flavonol biosynthesis.
Verbatim
e0“Together, these data supports the view flavonol biosynthesis in grape is stimulated predominantly through the low fluence UV-B response pathway.”
The same questions in other papers
uv · molecular: metabolites · VitisPositive and negative results
19 papers in the same direction as this paper · 5 in the opposite direction · 1 reporting no difference from an alternative
- positive
- positive
- negative
22 papers more in this group
See all 26 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.