27 Result(s)
within
Reimund Goss
Plant Sciences
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Chapter
In Mantoniella Squamata Deepoxidized Xanthophyll Cycle Pigments Show a Tighter Pigment Protein Coupling than the Respective Epoxidized Forms
The prasinophycean alga Mantoniella squamata uses in vivo an incomplete violaxanthin cycle with antheraxanthin accumulating during periods of strong illumination (1). Antheraxanthin enhances thermal dissipation o...
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Chapter
Multiple Short Term Effects of UV-B Radiation on the Diatom Phaeodactylum Tricornutum
Increases in UV-B irradiance lead to many specific damaging effects upon the plants including damage of the thylakoid membrane, partial inhibition of PS II, decrease of chloroplast ATPase activity, loss of enz...
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Chapter
Picosecond Time Resolved Analysis of the Fast and Slow Reversible Non-Photochemical Chlorophyll Fluorescence Quenching
Photosystem II, which is a potential target of adverse effects of supersaturating light, is strongly dependent on a mechanism, which allows to switch over between efficient photochemical energy conversion at l...
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Article
The xanthophyll cycle of Mantoniella squamata converts violaxanthin into antheraxanthin but not to zeaxanthin: consequences for the mechanism of enhanced non-photochemical energy dissipation
The prasinophycean alga Mantoniella squamata uses in vivo an incomplete violaxanthin cycle. Although the violaxanthin cycle in Mantoniella is capable of converting violaxanthin to zeaxanthin, in intact cells onl...
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Article
Stimulation of the diadinoxanthin cycle by UV-B radiation in the diatom Phaeodactylum tricornutum
In this study we show that the diadinoxanthin cycle in the diatom Phaeodactylum tricornutum is stimulated by mild UV-B radiation. High steady state concentrations of diatoxanthin established during a period of...
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Article
Non-photochemical chlorophyll fluorescence quenching and structural rearrangements induced by low pH in intact cells of Chlorella fusca (Chlorophyceae) and Mantoniella squamata (Prasinophyceae)
We have used circular dichroism (CD) spectroscopy and chlorophyll fluorescence induction measurements in order to examine low-pH-induced changes in the chiral macro-organization of the chromophores and in the ...
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Article
The de-epoxidase and epoxidase reactions of Mantoniella squamata (Prasinophyceae) exhibit different substrate-specific reaction kinetics compared to spinach
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Article
The de-epoxidase and epoxidase reactions of Mantoniella squamata (Prasinophyceae) exhibit different substrate-specific reaction kinetics compared to spinach
In vivo the prasinophyceaen alga Mantoniella squamata Manton et Parke uses an incomplete violaxanthin (Vx) cycle, leading to a strong accumulation of antheraxanthin (Ax) under conditions of high light. Here, we ...
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Article
Light regulation of carotenoid biosynthesis in the prasinophycean alga Mantoniella squamata
We have studied carotenoid biosynthesis in the prasinophycean alga Mantoniella squamata, which contains a great variety of carotenoids belonging to both the a- and the ß-carotene (Car) biosyntheses pathways. This...
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Article
Substrate specificity of the violaxanthin de-epoxidase of the primitive green alga Mantoniella squamata (Prasinophyceae)
The substrate specificity of the enzyme violaxanthin de-epoxidase (VDE) of the primitive green alga Mantoniella squamata (Prasinophyceae) was tested in in vitro enzyme assays employing the following xanthophyll m...
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Chapter and Conference Paper
The Oligomeric Antenna of the Diatom P. tricornutum — Localisation of Diadinoxanthin Cycle Pigments
In the present work a thorough examination of the oligomeric antenna of P. tricornutum was performed. Solubilisation of thylakoids with n-dodecyl β-d-maltoside in combination with gelfiltration and sucrose densit...
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Chapter and Conference Paper
Evidence for a Fast, Xanthophyll Cycle Independent NPQ Mechanism in the Diatom C. meneghiniana
for the diatom Phaeodactylum tricornutum it was reported that non-photochemical quenching (NPQ) strictly depends on the de-epoxidation state of the xanthophyll cycle (XC) pigment pool. In our present study we sho...
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Article
Structurally flexible macro-organization of the pigment–protein complexes of the diatom Phaeodactylum tricornutum
By means of circular dichroism (CD) spectroscopy, we have characterized the organization of the photosynthetic complexes of the diatom Phaeodactylum tricornutum at different levels of structural complexity: in in...
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Article
The synthesis of NPQ-effective zeaxanthin depends on the presence of a transmembrane proton gradient and a slightly basic stromal side of the thylakoid membrane
In the present study we address the question which factors during the synthesis of zeaxanthin determine its capacity to act as a non-photochemical quencher of chlorophyll fluorescence. Our results show that ze...
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Chapter
Lipids in Algae, Lichens and Mosses
Lipids from algae, lichens and mosses are highly diverse and differ from prokaryotic cyanobacteria and vascular plants in many aspects. Although in lower eukaryotes most of the lipids have functions similar to...
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Article
Regulation and function of xanthophyll cycle-dependent photoprotection in algae
The xanthophyll cycle represents one of the important photoprotection mechanisms in plant cells. In the present review, we summarize current knowledge about the violaxanthin cycle of vascular plants, green and...
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Article
Molecular dynamics of the diatom thylakoid membrane under different light conditions
During the last years significant progress was achieved in unraveling molecular characteristics of the thylakoid membrane of different diatoms. With the present review it is intended to summarize the current k...
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Chapter and Conference Paper
Effect of Lipids on Violaxanthin and Diadinoxanthin De-Epoxidation
Violaxanthin (Vx) and diadinoxanthin (Ddx) de-epoxidation are light dependent steps in one of the most important photoprotecting processes called respectively violaxanthin and diadinoxanthin cycle. Violaxanthi...
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Chapter
The Peculiar Features of Non-Photochemical Fluorescence Quenching in Diatoms and Brown Algae
Diatoms and brown algae are major contributors to marine primary production. They are biologically diverse, with thousands of different species, and are extremely successful, occupying almost every marine ecos...
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Article
Influence of pH, Mg2+, and lipid composition on the aggregation state of the diatom FCP in comparison to the LHCII of vascular plants
In the present study, the influence of Mg2+ ions and low pH values on the aggregation state of the diatom FCP and the LHCII of vascular plants was studied. In addition, the concentration of thylakoid membrane lip...
