Species-specific responses of spectral reflectance and the photosynthetic characteristics in two selected Antarctic mosses to thallus desiccation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F22%3A00125141" target="_blank" >RIV/00216224:14310/22:00125141 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s11738-021-03339-6" target="_blank" >https://link.springer.com/article/10.1007/s11738-021-03339-6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11738-021-03339-6" target="_blank" >10.1007/s11738-021-03339-6</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Species-specific responses of spectral reflectance and the photosynthetic characteristics in two selected Antarctic mosses to thallus desiccation

Popis výsledku v původním jazyce

Mosses are considered highly resistant against desiccation because they maintain photosynthetic activity even when severely dehydrated. In our study, we investigated changes in the photochemical processes of photosynthesis, as well as the spectral reflectance parameters during controlled rehydration and desiccation in two Antarctic species, i.e. Brachythecium austro-glareosum and Bryum pseudotriquetrum. Changes in primary photochemical processes were evaluated by chlorophyll fluorescence, i.e. slow Kautsky kinetics supplemented with saturation light pulses. In desiccating thalli, an effective quantum yield of photosynthetic processes in PS II (phi(PSII)) remained unchanged within low to moderate desiccation, i.e. with a relative water content (RWC) decrease from fully wet (100%) to semidry (30%). Below 20% RWC, phi(PSII) showed a species-specific decline, as well as steady-state fluorescence (F-S). A half-decrease in phi(PSII) was reached at an RWC of 12.6% (B. austro-glareosum) and 9.8% (B. pseudotriquetrum). Rapid light-response curves showed a strong limitation of photosynthetic electron transport (ETR) at an RWC below 20% in both species. The phi(PSII) and ETR data suggested that both species were desiccation-tolerant and well adapted to harsh Antarctic environments. However, B. pseudotriquetrum was more resistant in a state of severe dehydration (RWC below 20%) than B. austro-glareosum. Spectral reflectance indices responded to desiccation either (a) similarly in the two species (normalised difference vegetation index [NDVI]), (b) with similar trends but different values (modified chlorophyll absorption in reflectance index [MCARI] and greenness index [GI]) and (c) species-specifically (photochemical reflectance index [PRI]).

Název v anglickém jazyce

Species-specific responses of spectral reflectance and the photosynthetic characteristics in two selected Antarctic mosses to thallus desiccation

Popis výsledku anglicky

Mosses are considered highly resistant against desiccation because they maintain photosynthetic activity even when severely dehydrated. In our study, we investigated changes in the photochemical processes of photosynthesis, as well as the spectral reflectance parameters during controlled rehydration and desiccation in two Antarctic species, i.e. Brachythecium austro-glareosum and Bryum pseudotriquetrum. Changes in primary photochemical processes were evaluated by chlorophyll fluorescence, i.e. slow Kautsky kinetics supplemented with saturation light pulses. In desiccating thalli, an effective quantum yield of photosynthetic processes in PS II (phi(PSII)) remained unchanged within low to moderate desiccation, i.e. with a relative water content (RWC) decrease from fully wet (100%) to semidry (30%). Below 20% RWC, phi(PSII) showed a species-specific decline, as well as steady-state fluorescence (F-S). A half-decrease in phi(PSII) was reached at an RWC of 12.6% (B. austro-glareosum) and 9.8% (B. pseudotriquetrum). Rapid light-response curves showed a strong limitation of photosynthetic electron transport (ETR) at an RWC below 20% in both species. The phi(PSII) and ETR data suggested that both species were desiccation-tolerant and well adapted to harsh Antarctic environments. However, B. pseudotriquetrum was more resistant in a state of severe dehydration (RWC below 20%) than B. austro-glareosum. Spectral reflectance indices responded to desiccation either (a) similarly in the two species (normalised difference vegetation index [NDVI]), (b) with similar trends but different values (modified chlorophyll absorption in reflectance index [MCARI] and greenness index [GI]) and (c) species-specifically (photochemical reflectance index [PRI]).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10611 - Plant sciences, botany

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Acta Physiologiae Plantarum

ISSN

0137-5881

e-ISSN

1861-1664

Svazek periodika

44

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

19

Strana od-do

1-19

Kód UT WoS článku

000723990000001

EID výsledku v databázi Scopus

2-s2.0-85120155733