The Function of Flavonoids in the Diurnal Rhythm under Rapidly Changing UV Conditions—A Model Study on Okra

Flavonoids are favored compounds in plant responses to UV exposure and act in UV absorption and antioxidant activity. Here, it was investigated, with okra as a model species, how fast plants can react to changing UV conditions and to what extent these reactions take place. Okra (<i>Abelmoschus...

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Autores principales:	Susanne Neugart, Mark A. Tobler, Paul W. Barnes
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Dualex diurnal rhythm UV exclusion quercetin-3-xylosyl-glucoside Botany QK1-989
Acceso en línea:	https://doaj.org/article/fdf3edb9128f4f6b93e0c8d182878c14
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spelling	oai:doaj.org-article:fdf3edb9128f4f6b93e0c8d182878c142021-11-25T18:44:32ZThe Function of Flavonoids in the Diurnal Rhythm under Rapidly Changing UV Conditions—A Model Study on Okra10.3390/plants101122682223-7747https://doaj.org/article/fdf3edb9128f4f6b93e0c8d182878c142021-10-01T00:00:00Zhttps://www.mdpi.com/2223-7747/10/11/2268https://doaj.org/toc/2223-7747Flavonoids are favored compounds in plant responses to UV exposure and act in UV absorption and antioxidant activity. Here, it was investigated, with okra as a model species, how fast plants can react to changing UV conditions and to what extent these reactions take place. Okra (<i>Abelmoschus esculentus</i>) plants were exposed to either full or nearly no UV radiation. The diurnal rhythm of the plants was driven by the UV radiation and showed up to a 50% increase of the flavonoid content (measured optically in the +UV plants). This was reflected only in the trends in UV-absorption and antioxidant activity of the extracts but not in the soluble flavonoid glycosides and hydroxycinnamic acid derivatives. In a second experiment, a transfer from a −UV to a +UV condition at 9:00 CDT showed the immediate start of the diurnal rhythm, while this did not occur if the transfer occurred later in the day; these plants only started a diurnal rhythm the following day. After an adaptation period of seven days, clear differences between the +UV and -UV plants could be found in all parameters, whereas plants transferred to the opposite UV condition settle between the +UV and -UV plants in all parameters. Broadly, it can be seen that the flavonoid contents and associated functions in the plant are subject to considerable changes within one day and within several days due to the UV conditions and that this can have a considerable impact on the quality of plant foods.Susanne NeugartMark A. ToblerPaul W. BarnesMDPI AGarticleDualexdiurnal rhythmUV exclusionquercetin-3-xylosyl-glucosideBotanyQK1-989ENPlants, Vol 10, Iss 2268, p 2268 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Dualex diurnal rhythm UV exclusion quercetin-3-xylosyl-glucoside Botany QK1-989
spellingShingle	Dualex diurnal rhythm UV exclusion quercetin-3-xylosyl-glucoside Botany QK1-989 Susanne Neugart Mark A. Tobler Paul W. Barnes The Function of Flavonoids in the Diurnal Rhythm under Rapidly Changing UV Conditions—A Model Study on Okra
description	Flavonoids are favored compounds in plant responses to UV exposure and act in UV absorption and antioxidant activity. Here, it was investigated, with okra as a model species, how fast plants can react to changing UV conditions and to what extent these reactions take place. Okra (<i>Abelmoschus esculentus</i>) plants were exposed to either full or nearly no UV radiation. The diurnal rhythm of the plants was driven by the UV radiation and showed up to a 50% increase of the flavonoid content (measured optically in the +UV plants). This was reflected only in the trends in UV-absorption and antioxidant activity of the extracts but not in the soluble flavonoid glycosides and hydroxycinnamic acid derivatives. In a second experiment, a transfer from a −UV to a +UV condition at 9:00 CDT showed the immediate start of the diurnal rhythm, while this did not occur if the transfer occurred later in the day; these plants only started a diurnal rhythm the following day. After an adaptation period of seven days, clear differences between the +UV and -UV plants could be found in all parameters, whereas plants transferred to the opposite UV condition settle between the +UV and -UV plants in all parameters. Broadly, it can be seen that the flavonoid contents and associated functions in the plant are subject to considerable changes within one day and within several days due to the UV conditions and that this can have a considerable impact on the quality of plant foods.
format	article
author	Susanne Neugart Mark A. Tobler Paul W. Barnes
author_facet	Susanne Neugart Mark A. Tobler Paul W. Barnes
author_sort	Susanne Neugart
title	The Function of Flavonoids in the Diurnal Rhythm under Rapidly Changing UV Conditions—A Model Study on Okra
title_short	The Function of Flavonoids in the Diurnal Rhythm under Rapidly Changing UV Conditions—A Model Study on Okra
title_full	The Function of Flavonoids in the Diurnal Rhythm under Rapidly Changing UV Conditions—A Model Study on Okra
title_fullStr	The Function of Flavonoids in the Diurnal Rhythm under Rapidly Changing UV Conditions—A Model Study on Okra
title_full_unstemmed	The Function of Flavonoids in the Diurnal Rhythm under Rapidly Changing UV Conditions—A Model Study on Okra
title_sort	function of flavonoids in the diurnal rhythm under rapidly changing uv conditions—a model study on okra
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/fdf3edb9128f4f6b93e0c8d182878c14
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The Function of Flavonoids in the Diurnal Rhythm under Rapidly Changing UV Conditions—A Model Study on Okra

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