Partitioning of absorbed light energy within photosystem II in barley can be affected by chloroplast movement

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61988987%3A17310%2F18%3AA1901V5O" target="_blank" >RIV/61988987:17310/18:A1901V5O - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/86652079:_____/18:00496377

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1011134418302690" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1011134418302690</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jphotobiol.2018.06.019" target="_blank" >10.1016/j.jphotobiol.2018.06.019</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Partitioning of absorbed light energy within photosystem II in barley can be affected by chloroplast movement

Popis výsledku v původním jazyce

Plants have developed many ways to protect reaction centres of photosystems against overexcitation. One of the mechanisms involves reduction of the leaf absorption cross-section by light-induced chloroplast avoidance reaction. Decrease in the probability of photon absorption by the pigments bound within photosystem II (PSII) complexes leads to the increase in quantum yield of PSII photochemistry (?PSII). On the other hand, the decrease of PSII excitation probability causes reduction of chlorophyll a fluorescence intensity which is manifested as the apparent increase of determined quantum yield of regulated light-induced non-photochemical quenching (?NPQ). Absorption of different light intensity by phototropins led to the different chloroplast distribution within barley leaves, estimated by measurement of the leaf transmittance. Due to a weak blue light used for transmittance measurements, leaves exposed to actinic light with wavelengths longer than 520 nm undergo chloroplast accumulation reaction, in contrast with leaves exposed to light with shorter wavelengths, that showed a different extent of chloroplast avoidance reaction. Based on the ?NPQ action spectra measured simultaneously with the transmittance, the influence of different chloroplast distribution on ?NPQ was assessed. The analysis of results showed that decrease in the leaf absorption cross-section due to increasing part of chloroplasts reaching profile position significantly affected the partitioning of excitation energy within PSII and such rearrangement also distorted measured ?NPQ and cannot be neglected in its interpretation. When the majority of chloroplastsreached profile position, the photoprotective effect appeared to be the most prominent for strong blue light that has the highest absorption in the upper leaf layers in comparison with green or red ones.

Název v anglickém jazyce

Partitioning of absorbed light energy within photosystem II in barley can be affected by chloroplast movement

Popis výsledku anglicky

Plants have developed many ways to protect reaction centres of photosystems against overexcitation. One of the mechanisms involves reduction of the leaf absorption cross-section by light-induced chloroplast avoidance reaction. Decrease in the probability of photon absorption by the pigments bound within photosystem II (PSII) complexes leads to the increase in quantum yield of PSII photochemistry (?PSII). On the other hand, the decrease of PSII excitation probability causes reduction of chlorophyll a fluorescence intensity which is manifested as the apparent increase of determined quantum yield of regulated light-induced non-photochemical quenching (?NPQ). Absorption of different light intensity by phototropins led to the different chloroplast distribution within barley leaves, estimated by measurement of the leaf transmittance. Due to a weak blue light used for transmittance measurements, leaves exposed to actinic light with wavelengths longer than 520 nm undergo chloroplast accumulation reaction, in contrast with leaves exposed to light with shorter wavelengths, that showed a different extent of chloroplast avoidance reaction. Based on the ?NPQ action spectra measured simultaneously with the transmittance, the influence of different chloroplast distribution on ?NPQ was assessed. The analysis of results showed that decrease in the leaf absorption cross-section due to increasing part of chloroplasts reaching profile position significantly affected the partitioning of excitation energy within PSII and such rearrangement also distorted measured ?NPQ and cannot be neglected in its interpretation. When the majority of chloroplastsreached profile position, the photoprotective effect appeared to be the most prominent for strong blue light that has the highest absorption in the upper leaf layers in comparison with green or red ones.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10610 - Biophysics

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>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

J PHOTOCH PHOTOBIO B

ISSN

1011-1344

e-ISSN

—

Svazek periodika

186

Číslo periodika v rámci svazku

September 2018

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

9

Strana od-do

98-106

Kód UT WoS článku

000443665200012

EID výsledku v databázi Scopus

2-s2.0-85049919311