Akcelerace redukce plastochinonového poolu alternativními cestami předchází poklesu asimilace CO2 u předehřátých listů.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F08%3A00005527" target="_blank" >RIV/61989592:15310/08:00005527 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Acceleration of plastoquinone pool reduction by alternative pathways precedes a decrease in photosynthetic CO2 assimilation in preheated barley leaves.

Popis výsledku v původním jazyce

Heat stress causes inhibition of photosynthetic CO2 assimilation, affects light photosynthetic reactions and accelerates alternative pathways of plastoquinone pool reduction (APPR).We have studied all these heat-sensitive processes after preheating to abroad range of physiological temperatures (24?46 C) to explore a role of these alternative pathways during heat stress. Primarily, the effective quantum yield of PSII photochemistry was reduced (at 40 C). This PSII downregulation was accompanied by the stimulation of APPR and preceded reduction of photosynthetic CO2 assimilation by 2 C; it occurred after preheating at 42 C because of inhibition in Rubisco (ribulose 1,5-bisphosphate carboxylase/oxygenase) activation process. Thus, we suggest that the heatinduced stimulation of APPR is not associated with the heat-induced inhibition of Calvin cycle as it was reported for other types of stresses. A possible role of APPR in the compensation of PSII downregulation is briefly discussed.

Název v anglickém jazyce

Acceleration of plastoquinone pool reduction by alternative pathways precedes a decrease in photosynthetic CO2 assimilation in preheated barley leaves.

Popis výsledku anglicky

Heat stress causes inhibition of photosynthetic CO2 assimilation, affects light photosynthetic reactions and accelerates alternative pathways of plastoquinone pool reduction (APPR).We have studied all these heat-sensitive processes after preheating to abroad range of physiological temperatures (24?46 C) to explore a role of these alternative pathways during heat stress. Primarily, the effective quantum yield of PSII photochemistry was reduced (at 40 C). This PSII downregulation was accompanied by the stimulation of APPR and preceded reduction of photosynthetic CO2 assimilation by 2 C; it occurred after preheating at 42 C because of inhibition in Rubisco (ribulose 1,5-bisphosphate carboxylase/oxygenase) activation process. Thus, we suggest that the heatinduced stimulation of APPR is not associated with the heat-induced inhibition of Calvin cycle as it was reported for other types of stresses. A possible role of APPR in the compensation of PSII downregulation is briefly discussed.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BO - Biofyzika

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2008

Kód důvěrnosti údajů

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

Název periodika

Physiologia Plantarum

ISSN

0031-9317

e-ISSN

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Svazek periodika

133

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

DK - Dánské království

Počet stran výsledku

13

Strana od-do

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Kód UT WoS článku

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EID výsledku v databázi Scopus

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