Data di Pubblicazione:
2010
Citazione:
Optimizing photosynthesis under fluctuating light: the role of the arabidopsis STN7 kinase / P. Pesaresi, A. Hertle, M. Pribil, A. Schneider, T. Kleine, D. Leister. - In: PLANT SIGNALING & BEHAVIOR. - ISSN 1559-2316. - 5:1(2010), pp. 21-25. [10.4161/psb.5.1.10198]
Abstract:
Optimal photosynthetic performance requires that equal
amounts of light are absorbed by photosystem II (PSII) and
photosystem I (PSI), which are functionally linked through the
photosynthetic electron transport chain. However, photosynthetic
organisms must cope with light conditions that lead to
the preferential stimulation of one or other of the photosystems.
Plants react to such imbalances by mounting acclimation
responses that redistribute excitation energy between photosystems
and restore the photosynthetic redox poise. In the
short term, this involves the so-called state transition process,
which, over periods of minutes, alters the antennal cross-sections
of the photosystems through the reversible association
of a mobile fraction of light-harvesting complex II (LHCII) with
PSI or PSII. Longer-lasting changes in light quality initiate a longterm
response (LTR), occurring on a timescale of hours to days,
that redresses imbalances in excitation energy by changing the
relative amounts of the two photosystems. Despite the differences
in their timescales of action, state transitions and LTR are
both triggered by the redox state of the plastoquinone (PQ)
pool, via the activation of the thylakoid kinase STN7, which
appears to act as a common redox sensor and/or signal transducer
for both responses. This review highlights recent findings
concerning the role of STN7 in coordinating short- and longterm
photosynthetic acclimation responses.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Arabidopsis; Long-term acclimation; Photosynthesis; State transitions; STN7
Elenco autori:
P. Pesaresi, A. Hertle, M. Pribil, A. Schneider, T. Kleine, D. Leister
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