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@article{2215563,
author = {Orekhova, Alla and Hájek, Josef},
article_number = {1},
doi = {http://dx.doi.org/10.5817/CPR2022-1-8},
keywords = {Svalbard; dehydration; rehydration; chlorophyll fluorescence; Sanionia uncinata; Racomitrium lanuginosum},
language = {eng},
issn = {1805-0689},
journal = {Czech Polar Reports},
title = {Responses of primary photosynthetic processes to repetitive rehydration differ in two representatives of Svalbard moss flora},
url = {https://journals.muni.cz/CPR/article/view/25402},
volume = {12},
year = {2022}
}
TY - JOUR
ID - 2215563
AU - Orekhova, Alla - Hájek, Josef
PY - 2022
TI - Responses of primary photosynthetic processes to repetitive rehydration differ in two representatives of Svalbard moss flora
JF - Czech Polar Reports
VL - 12
IS - 1
SP - 103-114
EP - 103-114
PB - Masaryk University Press
SN - 18050689
KW - Svalbard
KW - dehydration
KW - rehydration
KW - chlorophyll fluorescence
KW - Sanionia uncinata
KW - Racomitrium lanuginosum
UR - https://journals.muni.cz/CPR/article/view/25402
N2 - Global warming in polar regions brings a risk of more frequent and long-lasting dry periods due to warmer and windier climate during polar summers. Mosses are well adapted to desiccation-rehydration events and they have evolved remarkable constitutive and inducible mechanisms of desiccation tolerance. In our study, Sanionia uncinata and Racomitrium lanuginosum were collected in Svalbard and used for laboratory-based repetitive 32-h-lasting rehydration cycles with continuous monitoring of restoration of their primary photosynthetic processes measured by chlorophyll fluorescence parameters. Immediately after the addition of water to dry thalli, potential quantum yield of PSII (FV/FM) was about 50% of its maximum reached after 32 h of rehydration. In a course of time of rehydration, both species showed an increase in FV/FM and effective quantum yield (FPSII) following a S-curve relationship. Non-photochemical quenching did not show clear trend with the rehydration time, It differed between the two species and showed both decrease and increase with the time of rehydration. Relative chlorophyll fluorescence decrease (RFd), which is considered a vitality indicator, increase with the time of rehydration showing similar trends in the first and the third cycle of rehydration. The results indicate that both Sanionia uncinata and Racomitrium lanuginosum are resistant to desiccation since FV/FM and FPSII recovered fully after 32 h of rehydration and there we only minor differences in the two parameters between the first and third rehydration cycle.
ER -
OREKHOVA, Alla and Josef HÁJEK. Responses of primary photosynthetic processes to repetitive rehydration differ in two representatives of Svalbard moss flora. \textit{Czech Polar Reports}. Masaryk University Press, 2022, vol.~12, No~1, p.~103-114. ISSN~1805-0689. Available from: https://dx.doi.org/10.5817/CPR2022-1-8.
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