The effect of u.v.‐B radiation on u.v.‐absorbing secondary metabolites in birch seedlings grown under simulated forest soil conditions

Lavola, Anu; Julkunen‐Tiitto, Riitta; Aphalo, Pedro J.; Rosa, Tania De La; Lehto, Tarja

doi:10.1046/j.1469-8137.1997.00861.x

Cited by 75 publications

(60 citation statements)

References 44 publications

(68 reference statements)

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“…Differential conditions of light irradiance affected only the relative concentrations of constitutive metabolites of leaf tissue (Lois, 1994 ;Lavola et al, 1997), whereas they deactivated branch pathways of the phenylpropanoid metabolism leading to the biosynthesis of caffeic acid esters or flavonoids in sun or shade trichomes, respectively (Table 2). These findings closely resemble the mutual deactivation induced by UV radiation and pathogens of furanocoumarain and flavonoid branch pathways in parsley cells (Schmelzer et al, 1989 ;Douglas et al, 1992) and suggest further that phenylpropanoids accumulated in and secreted by glandular trichomes are synthesized in the cells of the secretory organs (Fahn, 1988).…”

Section: mentioning

confidence: 99%

Flavonoids accumulate in leaves and glandular trichomes of Phillyrea latifolia exposed to excess solar radiation

Tattini¹,

Gravano²,

Pinelli³

et al. 2000

New Phytologist

196

175

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Experiments were conducted on Phillyrea latifolia plants grown under a dense overstorey of Pinus pinea (shade plants) or on seashore dunes (sun plants) in a coastal area of Tuscany (42m 46h N, 10m 53h E). Total integrated photon flux densities averaged 1n67 and 61n4 m mol m −# d −" for shade and sun sites, respectively. A leaf morphological-structural analysis, a qualitative and quantitative analysis of phenylpropanoids of leaf tissue and leaf surface, and a histochemical localization of flavonoids were conducted. The area of sun leaves reached 57% of that of shade leaves, whereas leaf angle (β), sclerophylly index (ratio of leaf d. wt : leaf area), and trichome frequency (trichome number mm −# ) were markedly greater in leaves exposed to full solar radiation than in leaves acclimated to shade. The total thickness of sun leaves was 78% higher than that of shade leaves, mostly owing to a greater development of both palisade parenchyma and spongy mesophyll. The concentration, but not the composition, of leaf tissue phenylpropanoids varied significantly between sun and shade leaves, with a marked increase in flavonoid glycosides in sun leaves. Flavonoids occurred almost exclusively in the upper epidermal cells of shade leaves. By contrast, flavonoids largely accumulated in the upper and lower epidermis, as well as in the mesophyll tissue of leaves that were acclimated to full sunlight. Flavonoid glycosides were found exclusively in the secretory products of glandular trichomes of P. latifolia leaves exposed to high levels of light ; luteolin 7-Oglucoside and quercetin 3-O-rutinoside were the major constituents. By contrast, verbascoside and an unidentified caffeic acid derivative constituted 72% of total phenylpropanoids secreted by glandular trichomes of shade leaves, whereas they were not detected in glandular trichomes of sun leaves. These findings suggest that the light-induced synthesis of flavonoids in glandular trichomes of P. latifolia probably occurs in situ and concomitantly inactivates other branch pathways of the general phenylpropanoid metabolism. This is the first report of the key role of glandular trichomes and of flavonoid glycosides in the integrated mechanisms of acclimation of P. latifolia to excess light.

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Section: mentioning

confidence: 99%

Flavonoids accumulate in leaves and glandular trichomes of Phillyrea latifolia exposed to excess solar radiation

Tattini¹,

Gravano²,

Pinelli³

et al. 2000

New Phytologist

196

175

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“…The most abundant compounds in the extracts in addition to myricetin are chlorogenic acid, caffeic acid, p-coumaric acid, protocatechuic acid and syringic acid (gray cells in Table 2). These compounds can absorb UV-B (Lavola et al 1997, Rozema et al 2001, Cornard & Lapouge 2006, Sun et al 2007, Zazza & Sanna 2010. Therefore, it is conceivable that these compounds are responsible for protecting cucumber cotyledons against UV-B-induced damage caused by UV-B absorption.…”

Section: Discussionmentioning

confidence: 99%

Lowbush Blueberry, Highbush Blueberry and Cranberry Extracts Protect Cucumber (<i>Cucumis sativus</i> L.) Cotyledons from Damage Induced by UV-B Irradiation

Yamasaki

Mizoguchi

Kodama

et al. 2017

JARQ

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We prepared water extracts from four dry berries, lowbush blueberry (LBB) (Vaccinium angustifolium L.), highbush blueberry (HBB) (Vaccinium corymbosum L.), cranberry (CB) (Vaccinium macrocarpon Ait.) and grape (Vitis vinifera L.). The four berry extracts were efficient absorbers of ultraviolet (UV) light, primarily UV-B. The treatment of cucumber (Cucumis sativus L.) cotyledons with LBB, HBB and CB extracts attenuated the damage induced by continuous UV-B irradiation (0.58 W m -2 ) for 11 days and did not cause any side effects. Anthocyanin and polyphenol contents in the four berry extracts were analyzed using high performance liquid chromatography (HPLC) and spectrophotometry. Anthocyanins, which are major UV-absorbing compounds in higher plants, were not the primary polyphenolic compounds in the four berry extracts. A total of 51 specific polyphenols were identified. The LBB extract contained primarily chlorogenic acid, caffeic acid and protocatechuic acid; the HBB extract contained primarily chlorogenic acid, caffeic acid and syringic acid; and the CB extract contained primarily protocatechuic acid, myricetin and p-coumaric acid. These components might contribute to the protection of cucumber plants against UV-B-induced damage.

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“…[17,18] The absorption of the secondary metabolites phenolic, glucoside, phenolic acids, favonoids. [19] UVB absorbing compounds other than Flavonoids, some phenolic acids (Singapyl esters) and carotenoids have recently been acknowledge to play a role in UV protection. [20] In the case of every individual plant responses specific UV protective and adaptive have been found induction of UV absorbing phenolic compounds that afford UVB attenuation.…”

Section: Issn: 2320-5407mentioning

confidence: 99%

“…[20] In the case of every individual plant responses specific UV protective and adaptive have been found induction of UV absorbing phenolic compounds that afford UVB attenuation. [21,22] UVB radiation leads to increase in the amount of Flavonoids and phenolic acids [19,23] UVB attenuation, depending on their leaf structure and pigment composition, variation in susceptibility to enhance. [19,24] UVB induced accumulation of UVB absorbing compounds.…”

Section: Issn: 2320-5407mentioning

confidence: 99%

“…[21,22] UVB radiation leads to increase in the amount of Flavonoids and phenolic acids [19,23] UVB attenuation, depending on their leaf structure and pigment composition, variation in susceptibility to enhance. [19,24] UVB induced accumulation of UVB absorbing compounds. [24,25] Annona.muricata (L), commonly known as soursop, graviola, a native to the warmest tropical area in South and North America and is now widely distributed throughout tropical and subtriopical parts of the world India, Malaysia and Nigeria.…”

Section: Issn: 2320-5407mentioning

confidence: 99%

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Green Synthesis of Annona Muricata (L) Zno NPS Uv Absorber on Textile.

Sharmila¹,

Sathya²

2017

IJAR

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The effect of u.v.‐B radiation on u.v.‐absorbing secondary metabolites in birch seedlings grown under simulated forest soil conditions

Abstract: SUMMARYBirch {Betula pendula Roth) seedlings were grown under enhanced u.v.-B radiation and simulated forest-soil conditions, after which individual secondary metabolites were determined in the leaves. It was found that not all of the u.

Cited by 75 publications

References 44 publications

Flavonoids accumulate in leaves and glandular trichomes of Phillyrea latifolia exposed to excess solar radiation

Flavonoids accumulate in leaves and glandular trichomes of Phillyrea latifolia exposed to excess solar radiation

Lowbush Blueberry, Highbush Blueberry and Cranberry Extracts Protect Cucumber (<i>Cucumis sativus</i> L.) Cotyledons from Damage Induced by UV-B Irradiation

Green Synthesis of Annona Muricata (L) Zno NPS Uv Absorber on Textile.

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