What does critical temperature tell us about the resistence of polar lichens to freezing stress? Applicability of linear cooling method to ecophysiological studies
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F22%3A43923195" target="_blank" >RIV/62156489:43410/22:43923195 - isvavai.cz</a>
Alternative codes found
RIV/00216224:14310/22:00128890
Result on the web
<a href="https://dx.doi.org/10.5817/CPR2022-2-18" target="_blank" >https://dx.doi.org/10.5817/CPR2022-2-18</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.5817/CPR2022-2-18" target="_blank" >10.5817/CPR2022-2-18</a>
Alternative languages
Result language
angličtina
Original language name
What does critical temperature tell us about the resistence of polar lichens to freezing stress? Applicability of linear cooling method to ecophysiological studies
Original language description
Lichens from polar regions are well adapted to low temeprature and considered cryoresistant. However, interspecific differences in their cryoresistence exist according to the degree of their adaptation and severity of the environment. In our study, we applied linear cooling technique in order to evaluate the interspecific differences in several lichen species. Thalli segments of Umbilicaria antarctica, Nephroma antarctica, Placopsis contortuplicata and Lasallia pustulata were exposed to the cooling from 20 to -35 degrees C at a constant rate of 2 degrees C min(-1). Simultaneously with the cooling, chlorophyll fluorescence parameters evaluating potential (F-V/F-M) and effective yield of primary photochemical processes in PSII (Phi(PSII)) were measured in 30 s interval. Temperature re-sponse curves of F-V/F-M and Phi(PSII) formed typical S-curves that were species specific. Critical temperature (cooling point at which Phi(PSII) equals 0), was found in a narrow range of -25 to -28 degrees C, suggesting that all experimental lichen species have a high resistance to sub-zero temperatures. The method of linear cooling used in this study has proven its applicability in ecophysiological studies since it is sensitive enough for the evaluation of species-specific differences in cryoresistence. This study describes different parameters that can be derived from the S-curves and discuss their proper use in ecophysiological and stress physiology studies.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10611 - Plant sciences, botany
Result continuities
Project
<a href="/en/project/EF16_013%2F0001708" target="_blank" >EF16_013/0001708: ECOPOLARIS - Changes in structure and function of components of terrestrial polar ecosystems (CzechPolar2)</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Czech Polar Reports
ISSN
1805-0689
e-ISSN
1805-0697
Volume of the periodical
12
Issue of the periodical within the volume
2
Country of publishing house
CZ - CZECH REPUBLIC
Number of pages
10
Pages from-to
246-255
UT code for WoS article
000935360100008
EID of the result in the Scopus database
2-s2.0-85151484685