Desiccation resistence of photosynthetic processes in photo-system II of Antarctic moss <i>Sanionia uncinata</i> assessed by two chlorophyll fluorescence methods

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Desiccation resistence of photosynthetic processes in photo-system II of Antarctic moss <i>Sanionia uncinata</i> assessed by two chlorophyll fluorescence methods

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Desiccation resistence of photosynthetic processes in photo-system II of Antarctic moss <i>Sanionia uncinata</i> assessed by two chlorophyll fluorescence methods

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10611 - Plant sciences, botany

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

CZECH POLAR REPORTS

ISSN

1805-0689

e-ISSN

1805-0697

Svazek periodika

15

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

16

Strana od-do

167-182

Kód UT WoS článku

001583685300010

EID výsledku v databázi Scopus

2-s2.0-105019101246