The influence of reducing the chlorophyll concentration by photobleaching on energy transfer to artificial traps within Photosystem II antenna systems

Jennings, Robert C.; Zucchelli, Giuseppe; Garlaschi, Flavio M.

doi:10.1016/s0005-2728(89)80197-5

Cited by 9 publications

(2 citation statements)

References 21 publications

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“…values between those found in this study and a temperature study conducted with dipterocarp tree species (Kitao et al 2000). Studies with PS II isolated from spinach, concluded that detrimental effects to energy transfer in the photosystems occurred when photobleaching was beyond 70% of the chlorophyll pigments (Jennings et al 1989). As mentioned earlier, the chl a and carotenoid levels in the wild blueberry plant also declined at the end of the season (Figs.…”

Section: Light-adapted Leaf Fluorescencesupporting

confidence: 80%

Seasonal changes in photochemistry, light use efficiency and net photosynthetic rates of wild blueberry (Vaccinium angustifoliumAit.)

et al. 2012

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Percival, D., Kaur, J., Hainstock, L. J. and Privé, J.-P. 2012. Seasonal changes in photochemistry, light use efficiency and net photosynthetic rates of wild blueberry (Vaccinium angustifolium Ait.). Can. J. Plant Sci. 92: 1135–1143. The seasonal variation of carotenoid concentration, chlorophyll a and b levels, dark- (Fv/Fm) and light-adapted (Fv′/Fm′) variable to maximal chlorophyll fluorescence (an indication of the quantum efficiency of PSII photochemistry) and net photosynthesis of the wild blueberry (Vaccinium angustifolium Ait.) was examined in the vegetative and cropping phases of production. Chlorophyll levels ranged from 2.0 to 12 µg cm−2 and from 0.042 to 1.4 µg cm−2 for chlorophyll a and b, respectively, were significantly lower in the cropping phase of production, and were also lower in the latter stages of the growing season. Similarly, carotenoid concentrations ranged from 0.67 to 4.1 µg cm−2 and were lower in the cropping phase of production. However, carotenoid concentration and dark- and light-adapted variable to maximal chlorophyll fluorescence (Fv/Fm and Fv′/Fm′) decreased marketably at the mid-point of the growing season, presumably as a result of photoinhibition. Net photosynthetic values of upright stems ranged from 2.1 to 7.6 µmol m−2 s−1, were substantially higher in the vegetative phase of production and also decreased significantly in the latter part of the growing season. Results from this investigation indicate that the wild blueberry has a relatively low photosynthetic rate, which may be prone to photoinhibition and limited carbohydrate supply (i.e., source) when compared with other temperate fruit crops.

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Section: Light-adapted Leaf Fluorescencesupporting

confidence: 80%

Seasonal changes in photochemistry, light use efficiency and net photosynthetic rates of wild blueberry (Vaccinium angustifoliumAit.)

et al. 2012

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“…A hypothesis that might explain the increased rates of bleaching after part of the pigments are oxidized is that the inter-pigment distances increase during photobleaching. It was recently shown that the efficiency of energy transfer leading to charge separation at the level of P680 in PSII submembrane fractions was not altered until about 30% of the Chl was bleached (Jennings et al, 1989). After this point, the efficiency decreased in proportion to the percentage of bleached Chl.…”

Section: Discussionmentioning

confidence: 99%

Energy Dissipation and Photoprotection Mechanisms During Chlorophyll Photobleaching in Thylakoid Membranes

Miller

Carpentier

1991

Photochem & Photobiology

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The kinetics of chlorophyll photobleaching were followed in whole thylakoid membranes as well as in photosystem I and photosystem I1 submembrane fractions. The onset of photobleaching was characterized by a slow rate which indicated the presence of energy traps implicated in the photoprotection of the bulk pigments. The pigments in photosystem I submembrane fractions bleached at a faster rate than those in photosystem I1 counterparts, the latter being more sensitive towardsphotoinhibition. An analysis of the pigment-protein complexes isolated from whole thylakoid membranes during the course of a photobleaching experiment has shown that the core-antenna complexes, including CP29, are more sensitive to illumination than the peripheral complexes. The absorption spectra of the CPI and CP2Y complexes presented a blue shift of the red absorption maximum after partial photobleaching, indicative of a non-homogeneous bleaching of the holochromes in these complexes. An analysis of these data points towards the involvement of CP2Y in a photoprotection mechanism at the level of photosystem 11. The weaker resistance of photosystem I to photobleaching relative to photosystem I1 and its stronger resistance to photoinhibition is discussed in terms of an energy dissipation pathway in thylakoid membranes.

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Chlorophyll Spectral Heterogeneity and Energy Transfer to PSII Reaction Centres

Garlaschi¹,

Zucchelli²,

Jennings³

1990

Current Research in Photosynthesis

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The influence of reducing the chlorophyll concentration by photobleaching on energy transfer to artificial traps within Photosystem II antenna systems

Cited by 9 publications

References 21 publications

Seasonal changes in photochemistry, light use efficiency and net photosynthetic rates of wild blueberry (Vaccinium angustifoliumAit.)

Seasonal changes in photochemistry, light use efficiency and net photosynthetic rates of wild blueberry (Vaccinium angustifoliumAit.)

Energy Dissipation and Photoprotection Mechanisms During Chlorophyll Photobleaching in Thylakoid Membranes

Chlorophyll Spectral Heterogeneity and Energy Transfer to PSII Reaction Centres

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