High-Light Stress and Photoprotection in <I>Umbilicaria antarctica</I> Monitored by Chlorophyll Fluorescence Imaging and Changes in Zeaxanthin and Glutathione

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F04%3A00019753" target="_blank" >RIV/00216224:14310/04:00019753 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

High-Light Stress and Photoprotection in <I>Umbilicaria antarctica</I> Monitored by Chlorophyll Fluorescence Imaging and Changes in Zeaxanthin and Glutathione

Original language description

The effect of high light on spatial distribution of chlorophyll (Chl) fluorescence parameters over a lichen thallus (Umbilicaria antarctica) was investigated by imaging of Chl fluorescence parameters before and after exposure to high light (1500 micromolm-2 s-1, 30 min at 5 degC). False colour images of FV/FM and FII distribution, taken over thallus with 0.1 mm2 resolution, showed that maximum FV/FM and FII values were located close to the thallus centre. Minimum values were typical for thallus margins. After exposure to high light, a differential response of FV/FM and FII was found. The marginal thallus part exhibited a loss of photosynthetic activity, manifested as a lack of Chl fluorescence signal, and close-to-centre parts showed a different extent of FV/FM and FII decrease. Subsequent recovery in the dark led to a gradual return of FV/FM and FII to their initial values. Fast (30 min) and slow (1 - 22 h) phase of recovery were distinguished, suggesting a sufficient capacity of pho

Czech name

Radiační stres a fotoochrana u lišejníku <I>Umbilicaria antarctica</I> monitorované pomocí zobrazovací metody fluorescence chlorofylu a změn v obsahu zeaxantinu a glutationu.

Czech description

V práci byl studován vliv radiačního stresu na lišejník Umbilicaria antarctica. Bylo zjištěno, že radiační stres zvýšil obsah oxidovaného glutationu (GSSG), a způsobil konverzi violaxanthinu na zeaxanthin, což se projevilo nárůstem hodnot DEPS. Tyto změny byly reverzibilní během zotavení lišejníků ve tmě. Hodnoty GSSG and DEPS byly těsně korelovány s NPQ, což indikuje zapojení antioxidantů do fotoochrany U. antarctica vůči silnému záření.

Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

EF - Botany

OECD FORD branch

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Project

<a href="/en/project/GA522%2F03%2F0754" target="_blank" >GA522/03/0754: Photoinhibition and photoprotection in lichens under extreme conditions</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2004

Confidentiality

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

Name of the periodical

Plant Biology

ISSN

1435-8603

e-ISSN

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Volume of the periodical

6

Issue of the periodical within the volume

3

Country of publishing house

DE - GERMANY

Number of pages

9

Pages from-to

333-341

UT code for WoS article

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EID of the result in the Scopus database

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