A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä

Consequences of photosystem‐I damage and repair on photosynthesis and carbon use in Arabidopsis thaliana




TekijätYugo Lima‐Melo, Peter J. Gollan, Mikko Tikkanen, Joaquim A. G. Silveira, Eva‐Mari Aro

KustantajaWiley-Blackwell Publishing Ltd.

Julkaisuvuosi2019

JournalPlant Journal

Vuosikerta97

Numero6

Aloitussivu1061

Lopetussivu1072

Sivujen määrä12

ISSN0960-7412

eISSN1365-313X

DOIhttps://doi.org/10.1111/tpj.14177

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/36728434


Tiivistelmä

Natural growth environments commonly include fluctuating conditions that can disrupt the photosynthetic energy balance and induce photoinhibition through inactivation of the photosynthetic apparatus. Photosystem II (PSII) photoinhibition is efficiently reversed by the PSII repair cycle, whereas photoinhibited photosystem I (PSI) recovers much more slowly. In the current study, treatment of the Arabidopsis thaliana mutant proton gradient regulation 5 (pgr5) with excess light was used to compromise PSI functionality in order to investigate the impact of photoinhibition and subsequent recovery on photosynthesis and carbon metabolism. The negative impact of PSI photoinhibition on CO2 fixation was especially deleterious under low irradiance. Impaired starch accumulation after PSI photoinhibition was reflected in reduced respiration in the dark, but this was not attributed to impaired sugar synthesis. Normal chloroplast and mitochondrial metabolisms were shown to recover despite the persistence of substantial PSI photoinhibition for several days. The results of this study indicate that the recovery of PSI function involves the reorganization of the light‐harvesting antennae, and suggest a pool of surplus PSI that can be recruited to support photosynthesis under demanding conditions.


Ladattava julkaisu

This is an electronic reprint of the original article.
This reprint may differ from the original in pagination and typographic detail. Please cite the original version.





Last updated on 2024-26-11 at 15:43