UV-B induced accumulation of tocopherol in Arabidopsis thaliana is not dependent on individual UV photoreceptors

Badmus, Uthman O.; Crestani, Gaia; O'Connell, Remi D.; Cunningham, Natalie; Jansen, Marcel A. K.

doi:10.1016/j.stress.2022.100105

Cited by 7 publications

(7 citation statements)

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“…It appears that individual photoreceptors do not necessarily play a critical role in carotenoid induction. Previously, it was shown that accumulation of tocopherol does not depend on the functional photoreceptors UVR8, phototropin, or cryptochrome [ 20 ]. These data may be interpreted as meaning that UV drives carotenoid accumulation through other UV-induced processes, perhaps the inhibition of photosynthesis, or possibly through combinations of redundant photoreceptors [ 69 ].…”

Section: Discussionmentioning

confidence: 99%

“…There is a wealth of knowledge on the relationship between UV-exposure and metabolite accumulation in plants. Reports have been published on the UV-induced accumulation of metabolites such as flavonoids, glucosinolates, anthocyanins, tocopherols, and polyamines, on changes in expression of key metabolic genes, on the functional role of UV-induced metabolites and on the roles of photoreceptors in metabolic reprofiling [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. Based on the complexity of the plant metabolite network, including cross-talk between different metabolic pathways [ 21 ] and/or acclimation pathways [ 22 ], it can be hypothesised that effects of UV will extend across a broad range of metabolite classes.…”

Section: Introductionmentioning

confidence: 99%

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UV Radiation Induces Specific Changes in the Carotenoid Profile of Arabidopsis thaliana

et al. 2022

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UV-B and UV-A radiation are natural components of solar radiation that can cause plant stress, as well as induce a range of acclimatory responses mediated by photoreceptors. UV-mediated accumulation of flavonoids and glucosinolates is well documented, but much less is known about UV effects on carotenoid content. Carotenoids are involved in a range of plant physiological processes, including photoprotection of the photosynthetic machinery. UV-induced changes in carotenoid profile were quantified in plants (Arabidopsis thaliana) exposed for up to ten days to supplemental UV radiation under growth chamber conditions. UV induces specific changes in carotenoid profile, including increases in antheraxanthin, neoxanthin, violaxanthin and lutein contents in leaves. The extent of induction was dependent on exposure duration. No individual UV-B (UVR8) or UV-A (Cryptochrome or Phototropin) photoreceptor was found to mediate this induction. Remarkably, UV-induced accumulation of violaxanthin could not be linked to protection of the photosynthetic machinery from UV damage, questioning the functional relevance of this UV response. Here, it is argued that plants exploit UV radiation as a proxy for other stressors. Thus, it is speculated that the function of UV-induced alterations in carotenoid profile is not UV protection, but rather protection against other environmental stressors such as high intensity visible light that will normally accompany UV radiation.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

UV Radiation Induces Specific Changes in the Carotenoid Profile of Arabidopsis thaliana

et al. 2022

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“…Moreover, DeLong and Steffen [100] conducted a study on spinach thylakoids and showed that α-tocopherol was involved in the antioxidant response against lipid peroxidation. In the same way, Badmus et al [27] reported a timedependent accumulation of tocopherols in Arabidopsis plants exposed to UV. However, other studies reported that tocopherol levels tend to be lowered following UV treatment [100][101][102].…”

Section: Uv Modulates Accumulation Of Tocopherols and Phytosterolsmentioning

confidence: 73%

“…The variation in tocopherol content might depend primarily on the presence of other antioxidants produced by the plant to counter ROS and avoid lipid peroxidation in the chloroplasts [99]. Thus, it has been hypothesised that in mono-and sesquiterpeneaccumulating mint plants, the role of tocopherols is not as pronounced as reported for Arabidopsis by Badmus et al [27].…”

Section: Uv Modulates Accumulation Of Tocopherols and Phytosterolsmentioning

confidence: 94%

“…Although the UV-mediated induction of phenolic and flavonoid metabolites is well documented, much less is known about UV-mediated changes in the content of other metabolites. For example, relatively few publications have reported the effects of UV radiation on amino acids, terpenoids, carotenoids, tocopherols, and sterols [26][27][28][29][30][31][32], while some studies have reported seemingly contradictory data.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive Modulation of Secondary Metabolites in Terpenoid-Accumulating Mentha spicata L. via UV Radiation

Crestani,

Večeřová,

Cunningham

et al. 2024

Plants

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In plants, secondary metabolites change in response to environmental conditions. These changes co-regulate resilience to stressful environmental conditions, plant growth and development, and interactions between plants and the wider ecosystem, while also affecting soil carbon storage and atmospheric and climatic conditions. The objective of this study was to determine the association between UV exposure and the contents of key metabolites, including amino acids, phenolics, flavonoids, terpenoids, carotenoids, tocopherols, and phytosterols. Mentha spicata plantlets were grown in tissue culture boxes for 30 days and then exposed to a low dose of broadband UV-B (291–315 nm; 2.8 kJm−2 biologically effective UV) enriched light for eight days. Metabolite contents were quantified either immediately after the final UV exposure, or after seven days of recovery under photosynthetically active radiation. It was found that UV promoted the production of flavonoids (1.8-fold) ahead of phenolic acids (unchanged). Furthermore, the majority of monoterpenes and sesquiterpenes, constituents of valuable mint essential oil, were significantly increased through UV treatment (up to 90-fold for α-linalool). In contrast, the contents of carotenoids and tocopherols did not increase following UV exposure. A comparison between plants sampled immediately after UV exposure and after seven days of recovery showed that there was an overall increase in the content of carotenoids, mono- and sesquiterpenes, phenolics, and amino acids following recovery, while the contents of sterols and tocopherols decreased. These UV-induced changes in metabolite profile may have important consequences for agriculture, ecology, and even the global climate, and they also provide an exciting opportunity to enhance crop value, facilitating the development of improved products with higher levels of essential oils and added benefits of enhanced flavour, colour, and bioactive content.

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Plant Secondary Metabolites in Stress Tolerance

Koç,

Karayiğit

2023

Climate-Resilient Agriculture, Vol 1

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UV-B induced accumulation of tocopherol in Arabidopsis thaliana is not dependent on individual UV photoreceptors

Cited by 7 publications

References 58 publications

UV Radiation Induces Specific Changes in the Carotenoid Profile of Arabidopsis thaliana

UV Radiation Induces Specific Changes in the Carotenoid Profile of Arabidopsis thaliana

Comprehensive Modulation of Secondary Metabolites in Terpenoid-Accumulating Mentha spicata L. via UV Radiation

Plant Secondary Metabolites in Stress Tolerance

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