UV-B induced morphogenesis

Jansen, Marcel A. K.; Coffey, Aoife; Prinsen, Els

doi:10.4161/psb.21260

Cited by 30 publications

(3 citation statements)

References 28 publications

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“…Although some of these defences are constitutively present, they can also be enhanced under increased UV radiation [ 13 , 17 ]. Besides photoprotection, UV radiation also triggers safeguards to anticipate other stressors such as heat or drought, and mediates in developmental cues such as morphogenetic responses to shade/light or interactions with other organisms [ 18 - 22 ]. Indeed, a sensing and signalling pathway that specifically perceives UV-B radiation has been discovered in Arabidopsis thaliana L. involving a regulatory cascade initiated at the UVB-RESISTANCE 8 (UVR8) UV-B radiation photoreceptor, which controls gene expression to trigger morphogenetic, metabolic, protective and repair mechanisms [ 22 - 24 ].…”

Section: Introductionmentioning

confidence: 99%

Solar ultraviolet radiation is necessary to enhance grapevine fruit ripening transcriptional and phenolic responses

et al. 2014

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BackgroundUltraviolet (UV) radiation modulates secondary metabolism in the skin of Vitis vinifera L. berries, which affects the final composition of both grapes and wines. The expression of several phenylpropanoid biosynthesis-related genes is regulated by UV radiation in grape berries. However, the complete portion of transcriptome and ripening processes influenced by solar UV radiation in grapes remains unknown.ResultsWhole genome arrays were used to identify the berry skin transcriptome modulated by the UV radiation received naturally in a mid-altitude Tempranillo vineyard. UV radiation-blocking and transmitting filters were used to generate the experimental conditions. The expression of 121 genes was significantly altered by solar UV radiation. Functional enrichment analysis of altered transcripts mainly pointed out that secondary metabolism-related transcripts were induced by UV radiation including VvFLS1, VvGT5 and VvGT6 flavonol biosynthetic genes and monoterpenoid biosynthetic genes. Berry skin phenolic composition was also analysed to search for correlation with gene expression changes and UV-increased flavonols accumulation was the most evident impact. Among regulatory genes, novel UV radiation-responsive transcription factors including VvMYB24 and three bHLH, together with known grapevine UV-responsive genes such as VvMYBF1, were identified. A transcriptomic meta-analysis revealed that genes up-regulated by UV radiation in the berry skin were also enriched in homologs of Arabidopsis UVR8 UV-B photoreceptor-dependent UV-B -responsive genes. Indeed, a search of the grapevine reference genomic sequence identified UV-B signalling pathway homologs and among them, VvHY5-1, VvHY5-2 and VvRUP were up-regulated by UV radiation in the berry skin.ConclusionsResults suggest that the UV-B radiation-specific signalling pathway is activated in the skin of grapes grown at mid-altitudes. The biosynthesis and accumulation of secondary metabolites, which are appreciated in winemaking and potentially confer cross-tolerance, were almost specifically triggered. This draws attention to viticultural practices that increase solar UV radiation on vineyards as they may improve grape features.

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Section: Introductionmentioning

confidence: 99%

Solar ultraviolet radiation is necessary to enhance grapevine fruit ripening transcriptional and phenolic responses

et al. 2014

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“…As well as study‐specific differences (UV dose, exposure, and measurement), evidence suggests that how plants respond morphologically is also species specific and depends on the parameter measured. This is probably because UV‐mediated morphogenesis is the result of multiple compensatory molecular and physiological mechanisms that interact with other environmental variables (Barnes et al, 1990 ; Jansen et al, 2012 , 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Floral ultraviolet absorbance area responds plastically to ultraviolet irradiance in Brassica rapa

Gray

Varga

Soulsbury

2022

Plant Enviro Interactions

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Solar ultraviolet (UV) radiation is known to have significant effects on the development and performance of plants, including flowers. In multiple species, UV‐absorbing floral patterns are associated with environmental conditions such as the solar UV exposure they typically receive. However, it is not known whether plants can increase the UV‐absorbing areas found on petals plastically when in a high‐UV environment. We grew Brassica rapa at three different UV radiation intensities (control, low, and high) and under two exposure duration regimes. We removed petals from flowers periodically during the flowering period and measured the proportion of the petal that absorbed UV. UV‐absorbing areas increased when plants were exposed to longer periods of UV radiation, and at high UV radiation intensities. UV‐absorbing area of petals of the UV intensity treatments decreased over time in long exposure plants. This study demonstrates that flowers can potentially acclimate to different UV radiation intensities and duration of exposure through an increase in UV‐absorbing areas even after a relatively short exposure time to UV. Such a rapid plastic response may be especially beneficial for dynamically changing UV conditions and in response to climate change.

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“…In plants, UV-B serves as an inducer, evoking critical physiological responses ranging from photomorphogenesis and photoprotection to circadian rhythms. This includes both molecular and intracellular changes 1–4 , such as induction of expression of at least 100 different genes, the accumulation of flavonoid-derived pigments 5 and antioxidants, DNA repair, as well as alteration of plant morphology 6 .…”

Section: Introductionmentioning

confidence: 99%

Proline 411 biases the conformation of the intrinsically disordered plant UVR8 photoreceptor C27 domain altering the functional properties of the peptide

Farkas

Eriksson

et al. 2019

Sci Rep

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UVR8 (UV RESISTANCE LOCUS 8) is a UV-B photoreceptor responsible for initiating UV-B signalling in plants. UVR8 is a homodimer in its signalling inactive form. Upon absorption of UV radiation, the protein monomerizes into its photoactivated state. In the monomeric form, UVR8 binds the E3 ubiquitin ligase COP1 (CONSTITUTIVELY PHOTOMORPHOGENIC 1), triggering subsequent UV-B-dependent photomorphogenic development in plants. Recent in vivo experiments have shown that the UVR8 C-terminal region (aa 397–423; UVR8C27) alone is sufficient to regulate the activity of COP1. In this work, CD spectroscopy and NMR experiments showed that the UVR8C27 domain was non-structured but gained secondary structure at higher temperatures leading to increased order. Bias-exchange metadynamics simulations were also performed to evaluate the free energy landscape of UVR8C27. An inverted free energy landscape was revealed, with a disordered structure in the global energy minimum. Flanking the global energy minimum, more structured states were found at higher energies. Furthermore, stabilization of the low energy disordered state was attributed to a proline residue, P411, as evident from P411A mutant data. P411 is also a key residue in UVR8 binding to COP1. UVR8C27 is therefore structurally competent to function as a molecular switch for interaction of UVR8 with different binding partners since at higher free energies different structural conformations are being induced in this peptide. P411 has a key role for this function.

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UV-B induced morphogenesis

Cited by 30 publications

References 28 publications

Solar ultraviolet radiation is necessary to enhance grapevine fruit ripening transcriptional and phenolic responses

Solar ultraviolet radiation is necessary to enhance grapevine fruit ripening transcriptional and phenolic responses

Floral ultraviolet absorbance area responds plastically to ultraviolet irradiance in Brassica rapa

Proline 411 biases the conformation of the intrinsically disordered plant UVR8 photoreceptor C27 domain altering the functional properties of the peptide

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