Enhanced light intensity increases flavonol and anthocyanin concentrations but reduces flavone levels in the cotyledons of common buckwheat seedlings

H. Dębski; W. Wiczkowski; D. Szawara-Nowak; N. Bączek; M. Szwed; M. Horbowicz

doi:10.1556/0806.45.2017.006

Cereal Research Communications

Volume/Issue:: Volume 45: Issue 2

Enhanced light intensity increases flavonol and anthocyanin concentrations but reduces flavone levels in the cotyledons of common buckwheat seedlings

Authors:

H. Dębski

H. Dębski Siedlce University of Natural Sciences and Humanities, 08-110 Siedlce, Prusa 12, Poland

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W. Wiczkowski

W. Wiczkowski Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland

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D. Szawara-Nowak

D. Szawara-Nowak Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland

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N. Bączek

N. Bączek Institute of Animal Reproduction and Food Research of Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland

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M. Szwed

M. Szwed Siedlce University of Natural Sciences and Humanities, 08-110 Siedlce, Prusa 12, Poland

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M. Horbowicz

M. Horbowicz Siedlce University of Natural Sciences and Humanities, 08-110 Siedlce, Prusa 12, Poland

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Pages:: 225–233

Online Publication Date:: Jun 2017

Publication Date:: 01 Jun 2017

Article Category:: Research Article

DOI:: https://doi.org/10.1556/0806.45.2017.006

Keywords:: common buckwheat; seedling; light intensity; flavonoids

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The effects of two light intensities on the concentration of several flavonoids were investigated in the cotyledons of common buckwheat seedlings. The study was performed on four days old seedlings of cvs. Hruszowska, Panda, Kora and Red Corolla. One group of seedlings was grown under exposure to 180 ± 20 μmol · m⁻² · s⁻¹ photosynthetically active radiation, whereas the other group was exposed to 360 ± 20 μmol · m⁻² · s⁻¹. The experiment lasted 5 days. The results revealed that light intensity induces changes in the levels of flavonols and flavones. Increased light intensity contributed to a decrease in the concentrations of all flavone C-glucosides: orientin (luteolin-8-C-glucoside) and iso-orientin (luteolin-6-C-glucoside), and apigenin: vitexin (apigenin-8-C-glucoside) and iso-vitexin (apigenin-6-C-glucoside). Simultaneously, a substantial increase in the content of flavonols, i.e. quercetin O-glycosides, was found. To the best of our knowledge, this is the first evidence to demonstrate the contrary responses of plant flavonols and flavones to light intensity. The content of anthocyanin also increased under exposure to higher light intensity. Our results indicate that quercetin O-glycosides can play a similar role to anthocyanins in the cotyledons of common buckwheat seedlings. Results of correlation analysis indicate that the increase in flavonol and anthocyanin concentrations in response to higher light intensity is maintained through reduced accumulation of flavones and proanthocyanidins.

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Cereal Research Communications A Quarterly of the Cereal Research Non-Profit Ltd. Company

Print ISSN:: 0133-3720

Online ISSN:: 1788-9170

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Cereal Research Communications
Language	English
Size	A4
Year of Foundation	1973
Volumes per Year	1
Issues per Year	4
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0133-3720 (Print)
ISSN	1788-9170 (Online)