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@article{2409904,
author = {Puhovkin, Anton and Hájek, Josef and Giordano, Davide and Sekerák, Jiří and Barták, Miloš},
article_number = {1},
doi = {http://dx.doi.org/10.15407/cryo33.01.025},
keywords = {chlorophyll fluorescence; cooling; cryoresistance; lichens; cyanobacteria; polar regions; photosystem II; photosynthesis},
language = {eng},
issn = {2307-6143},
journal = {Problems of Cryobiology and Cryomedicine},
title = {Cryoresistance Diff erences Between Species of Autotrops From Polar Regions Sensed by Chlorophyll Fluorescence},
url = {https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/1865/1981},
volume = {33},
year = {2023}
}
TY - JOUR
ID - 2409904
AU - Puhovkin, Anton - Hájek, Josef - Giordano, Davide - Sekerák, Jiří - Barták, Miloš
PY - 2023
TI - Cryoresistance Diff erences Between Species of Autotrops From Polar Regions Sensed by Chlorophyll Fluorescence
JF - Problems of Cryobiology and Cryomedicine
VL - 33
IS - 1
SP - 25-37
EP - 25-37
PB - National Academy of Sciences of Ukraine
SN - 23076143
KW - chlorophyll fluorescence
KW - cooling
KW - cryoresistance
KW - lichens
KW - cyanobacteria
KW - polar regions
KW - photosystem II
KW - photosynthesis
UR - https://cryo.org.ua/journal/index.php/probl-cryobiol-cryomed/article/view/1865/1981
N2 - Lichens from the cold regions of Earth exhibit high, but diff erent degree of tolerance to drought and freeze stresses. Therefore, three lichen species Xanthoria elegans, Umbilicaria cylindrica, Usnea sphacelata, and a representative of extre-mophilic cyanobacteria Nostoc commune were selected to measure temperature response curves of chlorophyll fl uorescence para-meters in cooling experiment using a constant rate of cooling from 20 to –45°C. Two chlorophyll fl uorescence parameters (FV/FM – potential yield of photosynthetic processes in photosystem II and ΦPSII – eff ective quantum yield) were measured with a modulated fl uorometer. For all experimental species, the temperature-response curves of II FV/FM and ΦPSII showed typical triphasic shape: plateau (temperature decrease from 20 to –5°C), decline, and a shoulder reaching the critical point. The phase typically formed a S-curve of diff erent shape as dependent on species and chlorophyll fl uorescence parameter. U. cylindrica was the most cryoresistant in terms of photosynthetic processes ongoing in thylakoid membrane of chloroplast at below zero temperature
ER -
PUHOVKIN, Anton, Josef HÁJEK, Davide GIORDANO, Jiří SEKERÁK and Miloš BARTÁK. Cryoresistance Diff erences Between Species of Autotrops From Polar Regions Sensed by Chlorophyll Fluorescence. \textit{Problems of Cryobiology and Cryomedicine}. National Academy of Sciences of Ukraine, 2023, vol.~33, No~1, p.~25-37. ISSN~2307-6143. Available from: https://dx.doi.org/10.15407/cryo33.01.025.
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