Zapojeni pigmentu xantofyloveho cyklu a glutathionu do fotoprotekce lisejniku <i>Umbilicaria antarctica<i>

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F04%3A00010172" target="_blank" >RIV/00216224:14310/04:00010172 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Involvement of xanthophyll cycle pigments and glutathione in photoprotection of lichen <i>Umbilicaria antarctica<i>

Popis výsledku v původním jazyce

High light (HL) stress could be expected even in HL-adapted lichens when their thalli, cells of symbiotic photobiont in particular, are exposed to HL in wet state. Among several physiological photoprotective mechanisms activated during such situations, conversion of violaxanthin to zeaxanthin (Z) and capacity of glutathione (GSH) pool are of major importance. Until now, however, changes in GSH pool and its redox state have been studied in lichens only in relation to water stress. Our experiments focusedon changes in Z (expressed as de-epoxidation state of xanthophyll cycle pigments - DEPS) and GSH during HL stress imposed on Umbilicaria antarctica. HL stress was induced by applying a strong light of 1800 umol m-2 s-1 for 30 min on hydrated thalli of U. antarctica at 20degC. Timecourse of HL stress and recovery was monitored by chlorophyll fluorescence (maximal quantum yield, Fv/Fm, non-photochemical quenching, NPQ). HL stress led to a photoinhibition demonstrated as a decrease of Fv/F

Název v anglickém jazyce

Involvement of xanthophyll cycle pigments and glutathione in photoprotection of lichen <i>Umbilicaria antarctica<i>

Popis výsledku anglicky

High light (HL) stress could be expected even in HL-adapted lichens when their thalli, cells of symbiotic photobiont in particular, are exposed to HL in wet state. Among several physiological photoprotective mechanisms activated during such situations, conversion of violaxanthin to zeaxanthin (Z) and capacity of glutathione (GSH) pool are of major importance. Until now, however, changes in GSH pool and its redox state have been studied in lichens only in relation to water stress. Our experiments focusedon changes in Z (expressed as de-epoxidation state of xanthophyll cycle pigments - DEPS) and GSH during HL stress imposed on Umbilicaria antarctica. HL stress was induced by applying a strong light of 1800 umol m-2 s-1 for 30 min on hydrated thalli of U. antarctica at 20degC. Timecourse of HL stress and recovery was monitored by chlorophyll fluorescence (maximal quantum yield, Fv/Fm, non-photochemical quenching, NPQ). HL stress led to a photoinhibition demonstrated as a decrease of Fv/F

Druh

D - Stať ve sborníku

CEP obor

EF - Botanika

OECD FORD obor

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Projekt

<a href="/cs/project/GA522%2F03%2F0754" target="_blank" >GA522/03/0754: Fotoinhibice a fotoochrana u lišejníků v extrémních podmínkách</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2004

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

14th International congress on photobiology, June 10-15, 2004, Program & Abstracts

ISBN

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ISSN

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e-ISSN

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Počet stran výsledku

299

Strana od-do

222-222

Název nakladatele

Korean Society of Photoscience

Místo vydání

Jeju, Korea

Místo konání akce

Jeju, Korea

Datum konání akce

10. 6. 2004

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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