Light acclimation involves dynamic re-organization of the pigment-protein megacomplexes in non-appressed thylakoid domains

The Plant Journal : for Cell and Molecular Biology
Marjaana SuorsaEva-Mari Aro

Abstract

Thylakoid energy metabolism is crucial for plant growth, development and acclimation. Non-appressed thylakoids harbor several high molecular mass pigment-protein megacomplexes that have flexible compositions depending upon the environmental cues. This composition is important for dynamic energy balancing in photosystems (PS) I and II. We analysed the megacomplexes of Arabidopsis wild type (WT) plants and of several thylakoid regulatory mutants. The stn7 mutant, which is defective in phosphorylation of the light-harvesting complex (LHC) II, possessed a megacomplex composition that was strikingly different from that of the WT. Of the nine megacomplexes in total for the non-appressed thylakoids, the largest megacomplex in particular was less abundant in the stn7 mutant under standard growth conditions. This megacomplex contains both PSI and PSII and was recently shown to allow energy spillover between PSII and PSI (Nat. Commun., 6, 2015, 6675). The dynamics of the megacomplex composition was addressed by exposing plants to different light conditions prior to thylakoid isolation. The megacomplex pattern in the WT was highly dynamic. Under darkness or far red light it showed low levels of LHCII phosphorylation and resembled the stn7...Continue Reading

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Citations

Jul 16, 2016·Scientific Reports·Masakazu IwaiAkihiko Nakano
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Oct 6, 2017·The Plant Journal : for Cell and Molecular Biology·Marjaana RantalaEva-Mari Aro
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