Antarctic Lichens under Long-Term Passive Warming:
Species-Specific Photochemical Responses to Desiccation and
Heat Shock Treatments

J 2022

Antarctic Lichens under Long-Term Passive Warming: Species-Specific Photochemical Responses to Desiccation and Heat Shock Treatments

MARIN, Catalina; Miloš BARTÁK; Gotz PALFNER; Pablo VERGARA-BARROS; Francisco FERNANDOY et. al.

Basic information

Original name

Antarctic Lichens under Long-Term Passive Warming: Species-Specific Photochemical Responses to Desiccation and Heat Shock Treatments

Authors

MARIN, Catalina; Miloš BARTÁK (203 Czech Republic, belonging to the institution); Gotz PALFNER; Pablo VERGARA-BARROS; Francisco FERNANDOY; Josef HÁJEK (203 Czech Republic, belonging to the institution) and Angelica CASANOVA-KATNY (guarantor)

Edition

Plants, MDPI, 2022, 2223-7747

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

10611 Plant sciences, botany

Country of publisher

Switzerland

Confidentiality degree

is not subject to a state or trade secret

References:

URL

Impact factor

Impact factor: 4.500

RIV identification code

RIV/00216224:14310/22:00128054

Organization unit

Faculty of Science

DOI

https://doi.org/10.3390/plants11192463

UT WoS

000867949600001

EID Scopus

2-s2.0-85139758214

Keywords in English

chlorophyll fluorescence; nitrogen isotope; climate change; thermal shock

Abstract

In the original language

Climate warming in the Antarctic tundra will affect locally dominant cryptogams. Being adapted to low temperatures and freezing, little is known about the response of the polar lichens’ primary photochemistry to warming and desiccation. Since 2008, we have monitored the ecophysiological responses of lichens to the future warming scenario during a long-term warming experiment through open top chambers (OTCs) on Fildes Peninsula. We studied the primary photochemical response (potential Fv/Fm and effective efficiency of photosystem II YPSII) of different lichen taxa and morphotypes under desiccation kinetics and heat shock experiments. As lichens grow slowly, to observe changes during warming we methodologically focused on carbon and nitrogen content as well as on the stable isotope ratios. Endemic Himantormia lugubris showed the strongest effect of long-term warming on primary photochemistry, where PSII activity occurred at a lower %RWC inside the OTCs, in addition to higher Fv/Fm values at 30 °C in the heat shock kinetic treatment. In contrast, Usnea aurantiaco-atra did not show any effect of long-term warming but was active at a thallus RWC lower than 10%. Both Cladonia species were most affected by water stress, with Cladonia aff. gracilis showing no significant differences in primary photochemical responses between the warming and the control but a high sensibility to water deficiency, where, at 60% thallus RWC, the photochemical parameters began to decrease. We detected species-specific responses not only to long-term warming, but also to desiccation. On the other hand, the carbon content did not vary significantly among the species or because of the passive warming treatment. Similarly, the nitrogen content showed non-significant variation; however, the C/N ratio was affected, with the strongest C/N decrease in Cladonia borealis. Our results suggest that Antarctic lichens can tolerate warming and high temperature better than desiccation and that climate change may affect these species if it is associated with a decrease in water availability.

Links

EF16_013/0001708, research and development project

Name: ECOPOLARIS - Změny ve struktuře a funkci součástí terestrických polárních ekosystémů (CzechPolar2)

VAN 2022, interní kód MU

Name: Český antarktický výzkumný program 2022 (Acronym: CARP 2022)

Investor: Ministry of Education, Youth and Sports of the CR, Czech Antarctic Research Programme 2022, Antarctic research

Cite

MARIN, Catalina; Miloš BARTÁK; Gotz PALFNER; Pablo VERGARA-BARROS; Francisco FERNANDOY; Josef HÁJEK and Angelica CASANOVA-KATNY. Antarctic Lichens under Long-Term Passive Warming: Species-Specific Photochemical Responses to Desiccation and Heat Shock Treatments. Plants. MDPI, 2022, vol. 11, No 19, p. 1-23. ISSN 2223-7747. Available from: https://doi.org/10.3390/plants11192463.

@article{2247391,
   author = {Marin, Catalina and Barták, Miloš and Palfner, Gotz and VergaraandBarros, Pablo and Fernandoy, Francisco and Hájek, Josef and CasanovaandKatny, Angelica},
   article_number = {19},
   doi = {https://doi.org/10.3390/plants11192463},
   keywords = {chlorophyll fluorescence; nitrogen isotope; climate change; thermal shock},
   language = {eng},
   issn = {2223-7747},
   journal = {Plants},
   title = {Antarctic Lichens under Long-Term Passive Warming: Species-Specific Photochemical Responses to Desiccation and Heat Shock Treatments},
   url = {https://www.mdpi.com/2223-7747/11/19/2463},
   volume = {11},
   year = {2022}
}

TY  - JOUR
ID  - 2247391
AU  - Marin, Catalina - Barták, Miloš - Palfner, Gotz - Vergara-Barros, Pablo - Fernandoy, Francisco - Hájek, Josef - Casanova-Katny, Angelica
PY  - 2022
TI  - Antarctic Lichens under Long-Term Passive Warming: Species-Specific Photochemical Responses to Desiccation and Heat Shock Treatments
JF  - Plants
VL  - 11
IS  - 19
SP  - 1-23
EP  - 1-23
PB  - MDPI
SN  - 22237747
KW  - chlorophyll fluorescence
KW  - nitrogen isotope
KW  - climate change
KW  - thermal shock
UR  - https://www.mdpi.com/2223-7747/11/19/2463
N2  - Climate warming in the Antarctic tundra will affect locally dominant cryptogams. Being adapted to low temperatures and freezing, little is known about the response of the polar lichens’ primary photochemistry to warming and desiccation. Since 2008, we have monitored the ecophysiological responses of lichens to the future warming scenario during a long-term warming experiment through open top chambers (OTCs) on Fildes Peninsula. We studied the primary photochemical response (potential Fv/Fm and effective efficiency of photosystem II YPSII) of different lichen taxa and morphotypes under desiccation kinetics and heat shock experiments. As lichens grow slowly, to observe changes during warming we methodologically focused on carbon and nitrogen content as well as on the stable isotope ratios. Endemic Himantormia lugubris showed the strongest effect of long-term warming on primary photochemistry, where PSII activity occurred at a lower %RWC inside the OTCs, in addition to higher Fv/Fm values at 30 °C in the heat shock kinetic treatment. In contrast, Usnea aurantiaco-atra did not show any effect of long-term warming but was active at a thallus RWC lower than 10%. Both Cladonia species were most affected by water stress, with Cladonia aff. gracilis showing no significant differences in primary photochemical responses between the warming and the control but a high sensibility to water deficiency, where, at 60% thallus RWC, the photochemical parameters began to decrease. We detected species-specific responses not only to long-term warming, but also to desiccation. On the other hand, the carbon content did not vary significantly among the species or because of the passive warming treatment. Similarly, the nitrogen content showed non-significant variation; however, the C/N ratio was affected, with the strongest C/N decrease in Cladonia borealis. Our results suggest that Antarctic lichens can tolerate warming and high temperature better than desiccation and that climate change may affect these species if it is associated with a decrease in water availability.
ER  -

MARIN, Catalina; Miloš BARTÁK; Gotz PALFNER; Pablo VERGARA-BARROS; Francisco FERNANDOY; Josef HÁJEK and Angelica CASANOVA-KATNY. Antarctic Lichens under Long-Term Passive Warming: Species-Specific Photochemical Responses to Desiccation and Heat Shock Treatments. \textit{Plants}. MDPI, 2022, vol.~11, No~19, p.~1-23. ISSN~2223-7747. Available from: https://doi.org/10.3390/plants11192463.

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