Evaluation of photosynthetic processes in Antarctic mosses and lichens exposed to controlled rate cooling: Species-specific responses

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F19%3A00109883" target="_blank" >RIV/00216224:14310/19:00109883 - isvavai.cz</a>

Result on the web

<a href="https://www.sci.muni.cz//CPR/17cislo/Folgar-Camean_web.pdf" target="_blank" >https://www.sci.muni.cz//CPR/17cislo/Folgar-Camean_web.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5817/CPR2019-1-10" target="_blank" >10.5817/CPR2019-1-10</a>

Result language

angličtina

Original language name

Evaluation of photosynthetic processes in Antarctic mosses and lichens exposed to controlled rate cooling: Species-specific responses

Original language description

Antarctic regions involve a great variety of habitats characterized by environmental stressors and life forms of autotrophic organisms with unique survival and functioning mechanisms. Lichens and mosses from these regions, similarly to high altitude alpine locations, have evolved physiological adaptations to perform photosynthesis at subzero temperatures. In this study we applied linear cooling technique in order to analyze interspecific differences in primary photosynthetic processes in Antarctic species affected by low and subzero temperature stress. We exposed Sanionia uncinata, Rhizoplaca aspidophora, Ochrolechia frigida, Cladonia sp., Himantormia lugubris and Umbilicaria decussata to the cooling from 20 to -35°C at a constant rate of 2°C min-1 . Fluorometric parameters were measured during the cooling experiments: FV/FM - potential yield of photosynthetic processes in photosystem II, and F0 - minimal chlorophyll fluorescence. All the species showed S-curves for FV/FM in response to decreasing temperature and interspecific differences in the parameters of S-curve equation. Critical temperature for FV/FM was found -35°C for U. decussata, while the other species ranged between -16 to -20°C. The changes of F0 with thallus temperature decrease were species-specific. F0 decrease followed by an increase was found with cooling from 20 to -20°C, and from -20 to -35°C, respectively, in the majority of cases. These results suggest that the experimental moss and lichen species from Antarctica have a high resistance to freezing temperatures. The underlying physiological mechanisms are constitutive features of Antarctic lichens and mosses. They are a crucial part of the adaptation and short-term acclimatory changes in ecophysiological performance of the organisms in harsh polar environments.

Czech name

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Czech description

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Type

J_SC - Article in a specialist periodical, which is included in the SCOPUS database

CEP classification

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OECD FORD branch

10600 - Biological sciences

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2019

Confidentiality

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

Name of the periodical

Czech Polar Reports

ISSN

1805-0689

e-ISSN

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Volume of the periodical

9

Issue of the periodical within the volume

1

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

11

Pages from-to

114-124

UT code for WoS article

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EID of the result in the Scopus database

2-s2.0-85079857235