Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1)

Plants acclimate to Photosystem I photoinhibition by readjusting the photosynthetic machinery




Julkaisun tekijätLempiäinen Tapio, Rintamäki Eevi, Aro Eva-Mari, Tikkanen Mikko

KustantajaWiley

Julkaisuvuosi2022

JournalPlant, Cell and Environment

Tietokannassa oleva lehden nimiPLANT CELL AND ENVIRONMENT

Lehden akronyymiPLANT CELL ENVIRON

Volyymi45

Julkaisunumero10

Aloitussivu2954

Lopetussivun numero2971

Sivujen määrä18

ISSN0140-7791

eISSN1365-3040

DOIhttp://dx.doi.org/10.1111/pce.14400

Verkko-osoitehttps://doi.org/10.1111/pce.14400

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/176354176


Tiivistelmä

Photosynthetic light reactions require strict regulation under dynamic environmental conditions. Still, depending on environmental constraints, photoinhibition of Photosystem (PSII) or PSI occurs frequently. Repair of photodamaged PSI, in sharp contrast to that of PSII, is extremely slow and leads to a functional imbalance between the photosystems. Slow PSI recovery prompted us to take advantage of the PSI-specific photoinhibition treatment and investigate whether the imbalance between functional PSII and PSI leads to acclimation of photosynthesis to PSI-limited conditions, either by short-term or long-term acclimation mechanisms as tested immediately after the photoinhibition treatment or after 24 h recovery in growth conditions, respectively. Short-term acclimation mechanisms were induced directly upon inhibition, including thylakoid protein phosphorylation that redirects excitation energy to PSI as well as changes in the feedback regulation of photosynthesis, which relaxed photosynthetic control and excitation energy quenching. Longer-term acclimation comprised reprogramming of the stromal redox system and an increase in ATP synthase and Cytochrome b6f abundance. Acclimation to PSI-limited conditions restored the CO2 assimilation capacity of plants without major PSI repair. Response to PSI inhibition demonstrates that plants efficiently acclimate to changes occurring in the photosynthetic apparatus, which is likely a crucial component in plant acclimation to adverse environmental conditions.


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Last updated on 2022-20-09 at 07:47