1.Institute of Physics, University of Amsterdam, Amsterdam, Netherlands
2.Dep. Physics and Astronomy, VU University Amsterdam, Amsterdam, Netherlands
3.College of Chemistry, University of California, Berkeley, CA, USA
4.Present address: Stockholm Resilience Centre, Stockholm University, Stockholm, Sweden
A Capretti (a.capretti@uva.nl)
纸质出版日期:2019,
网络出版日期:2019-01-09,
收稿日期:2018-08-04,
修回日期:2018-12-15,
录用日期:2018-12-16
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Nanophotonics of higher-plant photosynthetic membranes[J]. LSA, 2019,8(1):73-85.
Capretti, A. et al. Nanophotonics of higher-plant photosynthetic membranes. Light: Science & Applications, 8, 73-85 (2019).
Nanophotonics of higher-plant photosynthetic membranes[J]. LSA, 2019,8(1):73-85. DOI: 10.1038/s41377-018-0116-8.
Capretti, A. et al. Nanophotonics of higher-plant photosynthetic membranes. Light: Science & Applications, 8, 73-85 (2019). DOI: 10.1038/s41377-018-0116-8.
The thylakoid membrane inside chloroplasts hosts the light-dependent reactions of photosynthesis. Its embedded protein complexes are responsible for light harvesting
excitation energy transfer
charge separation
and transport. In higher plants
when the illumination conditions vary
the membrane adapts its composition and nanoscale morphology
which is characterized by appressed and non-appressed regions known as grana and stroma lamellae
respectively. Here we investigate the nanophotonic regime of light propagation in chloroplasts of higher plants and identify novel mechanisms in the optical response of the thylakoid membrane. Our results indicate that the relative contributions of light scattering and absorption to the overall optical response of grana strongly depend on the concentration of the light-harvesting complexes. For the pigment concentrations typically found in chloroplasts
the two mechanisms have comparable strengths
and their relative value can be tuned by variations in the protein composition or in the granal diameter. Furthermore
we find that collective modes in ensembles of grana significantly increase light absorption at selected wavelengths
even in the presence of moderate biological disorder. Small variations in the granal separation or a large disorder can dismantle this collective response. We propose that chloroplasts use this mechanism as a strategy against dangerously high illumination conditions
triggering a transition to low-absorbing states. We conclude that the morphological separation of the thylakoid membrane in higher plants supports strong nanophotonic effects
which may be used by chloroplasts to regulate light absorption. This adaptive self-organization capability is of interest as a model for novel bioinspired optical materials for artificial photosynthesis
imaging
and sensing.
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