Energy transfer and trapping in photosystem I

Gobets, Bas; Grondelle, Rienk van

doi:10.1016/s0005-2728(01)00203-1

Cited by 359 publications

(437 citation statements)

References 91 publications

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“…However, the spectral region which proved to be the best predictor of Chl a and other pigments was located at much longer wavelengths than PSI reaction center absorption at 700 nm. Mechanistically, light should be absorbed in this spectral region by the small number of specific pigmentprotein complexes, so called Bfar-red chlorophylls^ (Gobets and van Grondelle 2001;Melkozernov 2001;Gibasiewicz et al 2005), which nevertheless could transfer light energy to both PSII and PSI (Oja et al 2004;Pettai et al 2005a,b). The existence of such pigments has been shown and Fig.…”

Section: Discussionmentioning

confidence: 99%

Generality of relationships between leaf pigment contents and spectral vegetation indices in Mallorca (Spain)

et al. 2017

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Vegetation indices are calculated from reflectance data of discrete spectral bands. The reflectance signal in the visible spectral range is dominated by the optical properties of photosynthetic pigments in plant leaves. Numerous spectral indices have been proposed for the estimation of leaf pigment contents, but the efficacy of different indices for prediction of pigment content and composition for species-rich communities is unknown. Assessing the ability of different vegetation indices to predict leaf pigment content we identify the most suitable spectral indices from an experimental dataset consisting of field-grown high light exposed leaves of 33 angiosperm species collected in two sites in Mallorca (Spain) with contrasting leaf anatomy and pigment composition. Leaf-level reflectance spectra were recorded over the wavelength range of 400 -900 nm and contents of chlorophyll a, chlorophyll b, total carotenoids, and anthocyanins were measured in 33 species from different plant functional types, covering a wide range of leaf structures and pigment content, fivefold to more than 10-fold for different traits. The best spectral region for estimation of leaf total chlorophyll content with least interference from carotenoids and anthocyanins was the beginning of near-infrared plateau well beyond 700 nm. Leaves of parallel-veined monocots and pinnate-veined dicots had different relationships between vegetation indices and pigments. We suggest that the nature and role of Bfar-redĉ hlorophylls which absorb light at longer wavelengths than 700 nm constitute a promising target for future remote sensing studies.

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Section: Discussionmentioning

confidence: 99%

Generality of relationships between leaf pigment contents and spectral vegetation indices in Mallorca (Spain)

et al. 2017

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“…11 13 and Gobets and van Grondelle. 1 As seen from Figure 5, the profiles of the 697-and 701-nm pools are superimposed on the 700-nm pool of red Chls. However, these two small pools are not expected to introduce any important modifications to the applied model.…”

Section: Discussionmentioning

confidence: 99%

“…The processes of energy equilibration between these low-energy Chls and bulk Chls were extensively studied (see reviews 1,2 ), but the nature, location, and function of these red Chls are still not fully understood. [3][4][5][6][7][8][9][10][11][12] The red forms of Chls were characterized in detail for PSI core complexes from several species of cyanobacteria.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Low-Energy Chlorophylls in the PSI-LHCI Supercomplex from Chlamydomonas reinhardtii. A Site-Selective Fluorescence Study

et al. 2005

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Almost all photosystem I (PSI) complexes from oxygenic photosynthetic organisms contain chlorophylls that absorb at longer wavelength than that of the primary electron donor P700. We demonstrate here that the low-energy pool of chlorophylls in the PSI-LHCI complex from the green alga Chlamydomonas reinhardtii, containing five to six pigments, is significantly blue-shifted (A max at 700 nm at 4 K) compared to that in the PSI core preparations from several species of cyanobacteria and in PSI-LHCI particles from higher plants. This makes them almost isoenergetic with the primary donor. However, they keep the other characteristic features of "red" chlorophylls: clear spectral separation from the bulk chlorophylls, big Stokes shift revealing pronounced electron-phonon coupling, and large homogeneous and inhomogeneous broadening of ∼170 and ∼310 cm -1 , respectively.

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“…First, emission at 700 nm is widely considered to be a signature of NPQ [40,41]. Second, two of the peripheral antenna complexes of plant Photosystem 1 are typified by fluorescence spectral peaks beyond 720 nm, despite their proteins and chromophore content being remarkably similar to that of LHC2 [42]. The red emission from these Photosystem 1 antennae originates from a Chl dimer (Chls 603 and 609) that is so closely spaced that a charge-transfer state forms, which mixes with the lowest excitonic states, giving rise to a considerable increase in the reorganisation energy [43].…”

Section: Control Of Shade Light Absorptionmentioning

confidence: 99%

Design principles of natural light-harvesting as revealed by single molecule spectroscopy

Krüger

Grondelle

2016

Physica B: Condensed Matter

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Biology offers a boundless source of adaptation, innovation, and inspiration. A wide range of photosynthetic organisms exist that are capable of harvesting solar light in an exceptionally efficient way, using abundant and low-cost materials. These natural light-harvesting complexes consist of proteins that strongly bind a high density of chromophores to capture solar photons and rapidly transfer the excitation energy to the photochemical reaction centre. The amount of harvested light is also delicately tuned to the level of solar radiation to maintain a constant energy throughput at the reaction centre and avoid the accumulation of the products of charge separation. In this Review, recent developments in the understanding of light harvesting by plants will be discussed, based on results obtained from single molecule spectroscopy studies. Three design principles of the main light-harvesting antenna of plants will be highlighted: (a) fine, photoactive control over the intrinsic protein disorder to efficiently use intrinsically available thermal energy dissipation mechanisms; (b) the design of the protein microenvironment of a low-energy chromophore dimer to control the amount of shade absorption; (c) the design of the exciton manifold to ensure efficient funneling of the harvested light to the terminal emitter cluster.

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Energy transfer and trapping in photosystem I

Cited by 359 publications

References 91 publications

Generality of relationships between leaf pigment contents and spectral vegetation indices in Mallorca (Spain)

Generality of relationships between leaf pigment contents and spectral vegetation indices in Mallorca (Spain)

Characterization of Low-Energy Chlorophylls in the PSI-LHCI Supercomplex from Chlamydomonas reinhardtii. A Site-Selective Fluorescence Study

Design principles of natural light-harvesting as revealed by single molecule spectroscopy

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