Desiccation resistence of photosynthetic processes in photo-system II of Antarctic moss <i>Sanionia uncinata</i> assessed by two chlorophyll fluorescence methods
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F25%3A00143306" target="_blank" >RIV/00216224:14310/25:00143306 - isvavai.cz</a>
Result on the web
<a href="https://journals.muni.cz/CPR/article/view/41911" target="_blank" >https://journals.muni.cz/CPR/article/view/41911</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.5817/CPR2025-1-10" target="_blank" >10.5817/CPR2025-1-10</a>
Alternative languages
Result language
angličtina
Original language name
Desiccation resistence of photosynthetic processes in photo-system II of Antarctic moss <i>Sanionia uncinata</i> assessed by two chlorophyll fluorescence methods
Original language description
Dehydration-induced decrease of photosynthetic performance in mosses is a general response to thallus dessication. The decrease is caused by changes in photosystem II (PSII) functioning which is sensitively reflected in several chlorophyll fluorescence (ChlF) parameters. Apart from the decrease in potential yield of photosynthetic reactions in PSII (F-V/F-M), several protective mechanisms are activated during moss desiccation, non-photochemical quenching (NPQ) in particular. This is study focused on NPQ changes during the desiccation of Antarctic moss Sanionia uncinata. NPQ induction and relaxation curves were recorded during gradual dehydration from a fully wet state (relative water content [RWC] = 100%) to a fully dry state (RWC = 0%). Three key NPQ parameters were evaluated: NPQ(max) (maximum value), NPQ(termin) (at the end of induction) and NPQ(relax) (end of dark relaxation). The initial slope (alpha) and dark relaxation ((3) of NPQ were analysed. Additionally, fast chlorophyll fluorescence transients (OJIPs) were measured and the parameters related to PSII functioning evaluated for decreasing RWC. The relationships between the ChlF parameters and RWC were investigated. Results indicated that NPQ induction and relaxation curves-along with the OJIP-derived parameters were sensitive to dehydration. Since critical RWC for all the investigated ChlF parameters were found below 20%, Sanionia uncinata might be ranked into drought-resistant moss species.
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
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
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
15
Issue of the periodical within the volume
1
Country of publishing house
CZ - CZECH REPUBLIC
Number of pages
16
Pages from-to
167-182
UT code for WoS article
001583685300010
EID of the result in the Scopus database
2-s2.0-105019101246