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@article{491949,
author = {Barták, Miloš and Vráblíková, Hana and Hájek, Josef},
article_location = {Praha},
article_number = {4},
keywords = {chlorophyll fluorescence; low temperature; photoinhibition; photosynthesis; non-photochemical quenching; recovery.},
language = {cze},
issn = {0300-3604},
journal = {Photosynthetica},
title = {Sensitivity of photosystem 2 of Antarctic lichens to high irradiance stress:Fluorometric study of fruticose (Usnea antarctica)and foliose (Umbilicaria decussata) species},
url = {http://www.ueb.cas.cz/ps/contents_ps41-4.htm},
volume = {41},
year = {2003}
}
TY - JOUR
ID - 491949
AU - Barták, Miloš - Vráblíková, Hana - Hájek, Josef
PY - 2003
TI - Sensitivity of photosystem 2 of Antarctic lichens to high irradiance stress:Fluorometric study of fruticose (Usnea antarctica)and foliose (Umbilicaria decussata) species
JF - Photosynthetica
VL - 41
IS - 4
SP - 497-504
EP - 497-504
PB - Elsevier
SN - 03003604
KW - chlorophyll fluorescence
KW - low temperature
KW - photoinhibition
KW - photosynthesis
KW - non-photochemical quenching
KW - recovery.
UR - http://www.ueb.cas.cz/ps/contents_ps41-4.htm
N2 - Two lichen species collected in maritime Antarctica (King George Island) were exposed under laboratory conditions to excess irradiance to evaluate the response of photosystem 2 (PS2). The response was measured on fully hydrated lichen thalli at 5 oC by means of a modulated fluorometer using chlorophyll (Chl) fluorescence induction curve supplemented with analysis of quenching mechanisms. Chl fluorescence parameters [i.e. ratio of variable to maximum Chl fluorescence (FV/FM), quantum yield of PS2 photochemical reactions (?2), quenching coefficients] were evaluated before and several times after exposition to high irradiance in order to characterise the extent of photoinhibition, fast and slow phase of recovery. Strong irradiance (2 000 ľmol m-2 s-1) caused high degree of photoinhibition, particularly higher in fruticose (Usnea antarctica) than in foliose (Umbilicaria decussata) lichen species. Fast phase of recovery from photoinhibition, corresponding to regulatory mechanisms of PS2, was apparent in both species for FV/FM and ?2 within 40 min after photoinhibitory treatment. It was followed by a slow phase lasting several hours, corresponding to repair and re-synthesis processes. After photoinhibitory treatment, recovery of non-photochemical quenching (NPQ) was faster and more pronounced in U. decussata than in U. antarctica. Significant differences were found between the two species in the rate of recovery in fast- (qE) and slow-recovering (qT+I) component of NPQ.
ER -
BARTÁK, Miloš, Hana VRÁBLÍKOVÁ a Josef HÁJEK. Sensitivity of photosystem 2 of Antarctic lichens to high irradiance stress:Fluorometric study of fruticose (Usnea antarctica)and foliose (Umbilicaria decussata) species. \textit{Photosynthetica}. Praha: Elsevier, roč.~41, č.~4, s.~497-504. ISSN~0300-3604. 2003.
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