Chlorophyll-Xanthophyll Antenna Complexes: In Between Light Harvesting and Energy Dissipation

Schiphorst, Christo; Bassi, Roberto

doi:10.1007/978-3-030-33397-3_3

Cited by 6 publications

(4 citation statements)

References 177 publications

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“…The higher Car /Chl ratio in koLHC lines resulted from increased β-carotene accumulation, which doubled in koLhcb with respect to the LHCII-rich wild type and NoM (Supplementary Table S3). Neoxanthin decreased by 60% and 80%, respectively in koLHCII and koLhcb , with a concomitant increase in violaxanthin content owing to the preferential location of neoxanthin in trimeric LHCII and its absence in PSI-LHCI complexes (Schiphorst & Bassi, 2020).…”

Section: Resultsmentioning

confidence: 99%

Thylakoid grana stacking revealed by multiplex genome editing of LHCII encoding genes

Guardini

Gómez

Caferri

et al. 2022

Preprint

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Land plant chloroplasts differ from algal ones for their thylakoid membranes being organized in grana: piles of vesicles paired by their stromal surface, forming domains including Photosystem (PS) II and its antenna while excluding PS I and ATPase to stroma membranes, connecting grana stacks. The molecular basis of grana stacking remain unclear. We obtained genotypes lacking the trimeric antenna complex (Lhcb1-2-3), the monomeric Lhcb4-5-6, or both. Full deletion caused loss of grana, while either monomers or trimers support 50% stacking. The expression of Lhcb5 alone restored stacking at 50%, while Lhcb2 alone produced huge grana which broke down upon light exposure. Cyclic electron transport was maintained in the lack of stacking, while excitation energy balance between photosystems and the repair efficiency of damaged Photosystem II were affected. We conclude that grana evolved for need of regulating energy balance between photosystems under terrestrial canopy involving rapid changes in photon spectral distribution.

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Section: Resultsmentioning

confidence: 99%

Thylakoid grana stacking revealed by multiplex genome editing of LHCII encoding genes

Guardini

Gómez

Caferri

et al. 2022

Preprint

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“…This is probably a mechanism of protection of the photosynthetic apparatus against damage, which is considered essential for the short-term adaptation of plants to stress factors. In the photosynthetic process, the light absorbed by carotenoids and/or chlorophyll b in the proteins of the LHC is quickly transferred to chlorophyll a and then to other antenna pigments closely associated with the reaction center [38]. The LHC is involved in regulatory processes of the photosynthetic apparatus of the plant, so the increase in chlorophyll (a, b, and total) and carotenoids observed in the control treatment can be a regulatory mechanism by which the plant absorbs more energy and compensate for the reduced photosynthetic area (Leaves -Figure 1).…”

Section: Photosynthetic Pigmentsmentioning

confidence: 99%

Sources of fertilizers on the phytotechnical characteristics, oxidative stress and thymol production of Thymus vulgaris L.

Honorato,

Maciel,

De Assis

et al. 2024

Sci. Plena

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The objective of this study was to assess the effects of different fertilizer sources on the phytotechnical characteristics, oxidative stress, and thymol production of Thymus vulgaris. The experiment was conducted in 3-dm³ pots containing soil:sand (2:1) + treatment (no fertilizer, organic fertilizer, or chemical fertilizer). The organic fertilizer was 8 kg m-2 of an equal mixture of bovine, goat, and quail manures. The variables assessed were leaf, stem, root, and total dry weights; chlorophyll and carotenoid contents; leaf nutrients; total polyphenols; total antioxidant capacity; oxygen radical absorption capacity; DPPH free radical scavenging activity; essential oil content; and thymol production, content, and yield. Organic fertilization significantly increased the variables assessed and reduced oxidative stress indicators. It resulted in gains in the dry weight of the plants and the accumulation of nutrients in dry leaves of T. vulgaris. For the quantitative parameters of the essential oil and thymol, organic fertilization was significantly higher than the other treatments, especially for thymol content and yield. T. vulgaris plants fertilized with organic fertilizer maximize their plant production and their yield of compounds of interest, such as thymol, possibly because these outputs indicate a balance between improved vegetative production and the elimination of reactive oxygen species.

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“…The conversion of Vx to Ax and to Zx is typically much slower than the rapidly reversible protonation of PsbS [2], and during prolonged illumination, the responses of qE will probably be limited by the rate of acidification and deacidification of the thylakoid lumen, which are, in turn, governed by ion movements in the chloroplasts [9][10][11]. Slower forms of NPQ have also been demonstrated [12], including qI, which is related to the photodamage and repair of photosystem II (PSII) or qZ, which related to the accumulation of Zx (independently from qE) [13], qH, related to cold and high light stress [13], and qT, related to antenna state transitions [14].…”

Section: Introductionmentioning

confidence: 99%

Light potentials of photosynthetic energy storage in the field: what limits the ability to use or dissipate rapidly increased light energy?

et al. 2021

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The responses of plant photosynthesis to rapid fluctuations in environmental conditions are critical for efficient conversion of light energy. These responses are not well-seen laboratory conditions and are difficult to probe in field environments. We demonstrate an open science approach to this problem that combines multifaceted measurements of photosynthesis and environmental conditions, and an unsupervised statistical clustering approach. In a selected set of data on mint ( Mentha sp.), we show that ‘light potentials’ for linear electron flow and non-photochemical quenching (NPQ) upon rapid light increases are strongly suppressed in leaves previously exposed to low ambient photosynthetically active radiation (PAR) or low leaf temperatures, factors that can act both independently and cooperatively. Further analyses allowed us to test specific mechanisms. With decreasing leaf temperature or PAR, limitations to photosynthesis during high light fluctuations shifted from rapidly induced NPQ to photosynthetic control of electron flow at the cytochrome b 6 f complex. At low temperatures, high light induced lumen acidification, but did not induce NPQ, leading to accumulation of reduced electron transfer intermediates, probably inducing photodamage, revealing a potential target for improving the efficiency and robustness of photosynthesis. We discuss the implications of the approach for open science efforts to understand and improve crop productivity.

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Chlorophyll-Xanthophyll Antenna Complexes: In Between Light Harvesting and Energy Dissipation

Cited by 6 publications

References 177 publications

Thylakoid grana stacking revealed by multiplex genome editing of LHCII encoding genes

Thylakoid grana stacking revealed by multiplex genome editing of LHCII encoding genes

Sources of fertilizers on the phytotechnical characteristics, oxidative stress and thymol production of Thymus vulgaris L.

Light potentials of photosynthetic energy storage in the field: what limits the ability to use or dissipate rapidly increased light energy?

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