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Statements

Subject Item
n2:RIV%2F62156489%3A43210%2F10%3A00153057%21RIV12-GA0-43210___
rdf:type
skos:Concept n16:Vysledek
dcterms:description
Despite intensive research focused on UV-B effects, deeper metabolic responses to UV-A and UV-C are still scarce. Besides, especially microalgal species had to develop efficient protective features in comparison with tissue structure of vascular plants. We exposed axenic cultures of Scenedesmus quadricauda (Chlorophyceae) to UV-A (366 nm) and UV-C (254 nm) light over 1 h. Both wavelengths stimulated increase in soluble proteins, superoxide radical and hydrogen peroxide, but have non-significant effect on cell viability. Within 17 detected free amino acids, five of them (including proline) increased in response to UV-A while only aspartic acid and histidine increased in UV-C treatment. Total soluble phenols and flavonoids were influenced neither by UV-A nor by UV-C while selected flavonols (quercetin and kaempferol) decreased in UV-A and were not detected in UV-C treatment. Benzoic acid derivatives increased preferentially after UV-A illumination (vanillic acid and vanillin) while cinnamic derivatives (caffeic, chlorogenic and p-coumaric acids) decreased in both UV-A and UV-C. It is concluded that UV light stimulated oxidative stress while exposure time was not sufficient to stimulate larger changes of phenolic metabolites. Present findings in the context of available data and with emphasize on phenolics in algae are discussed. Despite intensive research focused on UV-B effects, deeper metabolic responses to UV-A and UV-C are still scarce. Besides, especially microalgal species had to develop efficient protective features in comparison with tissue structure of vascular plants. We exposed axenic cultures of Scenedesmus quadricauda (Chlorophyceae) to UV-A (366 nm) and UV-C (254 nm) light over 1 h. Both wavelengths stimulated increase in soluble proteins, superoxide radical and hydrogen peroxide, but have non-significant effect on cell viability. Within 17 detected free amino acids, five of them (including proline) increased in response to UV-A while only aspartic acid and histidine increased in UV-C treatment. Total soluble phenols and flavonoids were influenced neither by UV-A nor by UV-C while selected flavonols (quercetin and kaempferol) decreased in UV-A and were not detected in UV-C treatment. Benzoic acid derivatives increased preferentially after UV-A illumination (vanillic acid and vanillin) while cinnamic derivatives (caffeic, chlorogenic and p-coumaric acids) decreased in both UV-A and UV-C. It is concluded that UV light stimulated oxidative stress while exposure time was not sufficient to stimulate larger changes of phenolic metabolites. Present findings in the context of available data and with emphasize on phenolics in algae are discussed.
dcterms:title
Physiological Responses of Scenedesmus quadricauda (Chlorophyceae) to UV-A and UV-C Light Physiological Responses of Scenedesmus quadricauda (Chlorophyceae) to UV-A and UV-C Light
skos:prefLabel
Physiological Responses of Scenedesmus quadricauda (Chlorophyceae) to UV-A and UV-C Light Physiological Responses of Scenedesmus quadricauda (Chlorophyceae) to UV-A and UV-C Light
skos:notation
RIV/62156489:43210/10:00153057!RIV12-GA0-43210___
n3:aktivita
n5:P n5:V
n3:aktivity
P(GA525/07/0338), V
n3:cisloPeriodika
3
n3:dodaniDat
n8:2012
n3:domaciTvurceVysledku
n11:8683913
n3:druhVysledku
n9:J
n3:duvernostUdaju
n13:S
n3:entitaPredkladatele
n4:predkladatel
n3:idSjednocenehoVysledku
278938
n3:idVysledku
RIV/62156489:43210/10:00153057
n3:jazykVysledku
n18:eng
n3:klicovaSlova
phenols; amino acids; salicylic acid; algae; oxidative stress
n3:klicoveSlovo
n10:oxidative%20stress n10:salicylic%20acid n10:phenols n10:algae n10:amino%20acids
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[EEA8634313EA]
n3:nazevZdroje
Photochemistry and Photobiology
n3:obor
n17:ED
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:projekt
n15:GA525%2F07%2F0338
n3:rokUplatneniVysledku
n8:2010
n3:svazekPeriodika
86
n3:tvurceVysledku
Báčkor, Martin Klejdus, Bořivoj Kováčik, Jozef
s:issn
0031-8655
s:numberOfPages
5
n7:organizacniJednotka
43210