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Article

Regulation of Phenolic Compound Production by Light Varying in Spectral Quality and Total Irradiance

by
Radomír Pech
1,†,
Adriana Volná
1,†,
Lena Hunt
2,
Martin Bartas
3,
Jiří Červeň
3,
Petr Pečinka
3,
Vladimír Špunda
1,4,* and
Jakub Nezval
1,*
1
Department of Physics, Faculty of Science, University of Ostrava, 710 00 Ostrava, Czech Republic
2
Department of Experimental Plant Biology, Faculty of Science, Charles University, 128 00 Praha, Czech Republic
3
Department of Biology and Ecology, Faculty of Science, University of Ostrava, 710 00 Ostrava, Czech Republic
4
Global Change Research Institute, Czech Academy of Sciences, 603 00 Brno, Czech Republic
*
Authors to whom correspondence should be addressed.
†
These authors contributed equally to this work.
Int. J. Mol. Sci. 2022, 23(12), 6533; https://doi.org/10.3390/ijms23126533
Submission received: 12 May 2022 / Revised: 1 June 2022 / Accepted: 2 June 2022 / Published: 10 June 2022
(This article belongs to the Special Issue Role of Secondary Metabolites in Plant Response to Abiotic Stresses)
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Abstract

Photosynthetically active radiation (PAR) is an important environmental cue inducing the production of many secondary metabolites involved in plant oxidative stress avoidance and tolerance. To examine the complex role of PAR irradiance and specific spectral components on the accumulation of phenolic compounds (PheCs), we acclimated spring barley (Hordeum vulgare) to different spectral qualities (white, blue, green, red) at three irradiances (100, 200, 400 µmol m−2 s−1). We confirmed that blue light irradiance is essential for the accumulation of PheCs in secondary barley leaves (in UV-lacking conditions), which underpins the importance of photoreceptor signals (especially cryptochrome). Increasing blue light irradiance most effectively induced the accumulation of B-dihydroxylated flavonoids, probably due to the significantly enhanced expression of the F3′H gene. These changes in PheC metabolism led to a steeper increase in antioxidant activity than epidermal UV-A shielding in leaf extracts containing PheCs. In addition, we examined the possible role of miRNAs in the complex regulation of gene expression related to PheC biosynthesis.
Keywords: antioxidants; flavonoids; HPLC; miRNA; photoprotection; secondary metabolism; spectral quality of light; spring barley (Hordeum vulgare); transcriptomics; UV tolerance antioxidants; flavonoids; HPLC; miRNA; photoprotection; secondary metabolism; spectral quality of light; spring barley (Hordeum vulgare); transcriptomics; UV tolerance

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MDPI and ACS Style

Pech, R.; Volná, A.; Hunt, L.; Bartas, M.; Červeň, J.; Pečinka, P.; Špunda, V.; Nezval, J. Regulation of Phenolic Compound Production by Light Varying in Spectral Quality and Total Irradiance. Int. J. Mol. Sci. 2022, 23, 6533. https://doi.org/10.3390/ijms23126533

AMA Style

Pech R, Volná A, Hunt L, Bartas M, Červeň J, Pečinka P, Špunda V, Nezval J. Regulation of Phenolic Compound Production by Light Varying in Spectral Quality and Total Irradiance. International Journal of Molecular Sciences. 2022; 23(12):6533. https://doi.org/10.3390/ijms23126533

Chicago/Turabian Style

Pech, Radomír, Adriana Volná, Lena Hunt, Martin Bartas, Jiří Červeň, Petr Pečinka, Vladimír Špunda, and Jakub Nezval. 2022. "Regulation of Phenolic Compound Production by Light Varying in Spectral Quality and Total Irradiance" International Journal of Molecular Sciences 23, no. 12: 6533. https://doi.org/10.3390/ijms23126533

APA Style

Pech, R., Volná, A., Hunt, L., Bartas, M., Červeň, J., Pečinka, P., Špunda, V., & Nezval, J. (2022). Regulation of Phenolic Compound Production by Light Varying in Spectral Quality and Total Irradiance. International Journal of Molecular Sciences, 23(12), 6533. https://doi.org/10.3390/ijms23126533

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