2022
Responses of primary photosynthetic processes to repetitive rehydration differ in two representatives of Svalbard moss flora
OREKHOVA, Alla a Josef HÁJEKZákladní údaje
Originální název
Responses of primary photosynthetic processes to repetitive rehydration differ in two representatives of Svalbard moss flora
Autoři
OREKHOVA, Alla (643 Rusko, domácí) a Josef HÁJEK (203 Česká republika, garant, domácí)
Vydání
Czech Polar Reports, Masaryk University Press, 2022, 1805-0689
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10511 Environmental sciences
Stát vydavatele
Česká republika
Utajení
není předmětem státního či obchodního tajemství
Odkazy
Impakt faktor
Impact factor: 1.000
Kód RIV
RIV/00216224:14310/22:00126584
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000862170100008
Klíčová slova anglicky
Svalbard; dehydration; rehydration; chlorophyll fluorescence; Sanionia uncinata; Racomitrium lanuginosum
Štítky
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 12. 1. 2023 15:26, Mgr. Marie Šípková, DiS.
Anotace
V originále
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.
Návaznosti
MUNI/G/1540/2019, interní kód MU |
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