Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 135, Issue -, Pages 511-519Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2018.11.009
Keywords
Anthocyanins; Fruit; Phenylpropanoid biosynthesis; Secondary metabolites; UV radiation; UVR8
Categories
Funding
- University of Pisa
- Austrian Science Fund FWF [I 1725-B16]
- Erasmus + traineeship
- Austrian Science Fund (FWF) [I1725] Funding Source: Austrian Science Fund (FWF)
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Ultraviolet-B (UV-B) radiation impacts the plant behaviour in many ways, including modifying their secondary metabolism. Although several studies have quantified the UV-B effects on phenolic composition, most of them focused on leaves or investigated a limited amount of phenolics. The present work aimed to investigate the phenolic changes after two postharvest UV-B treatments, 10 and 60 min (1.39 kJ m(-2) and 8.33 kJ m(-2), respectively), on peach (Prunus persica cv Fairtime) fruit with a non-targeted, whole profiling approach, and targeted gene expression analysis on skin. After both UV-B exposures, peach fruit were harvested at 24 and 36 h for phenol-omics analysis, while additional 6 h and 12 h recovery times were used for gene expression analysis. Our results revealed that both UV-B exposures resulted in a decrease of several phenolic compounds, such as anthocyanins, after 24 h from the exposure. In contrast, the expression of the UV-B signalling components, the phenylpropanoid biosynthesis genes and their transcriptional regulators increased 6 h after the treatment, mostly with a UV-B-dose dependent behaviour, preceding an accumulation of most phenolics in both the UV-B treatments at 36 h compared to 24 h. Orthogonal projections to latent structures discriminant analysis (OPLS-DA) revealed that flavonoids, particularly anthocyanins, were the main phenolic subclasses accumulated after UV-B exposure.
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