A5055895423- Photosynthetic Processes and Mechanisms
- Light effects on plants
- Photoreceptor and optogenetics research
- Antioxidant Activity and Oxidative Stress
- Mitochondrial Function and Pathology
- Spectroscopy and Quantum Chemical Studies
- Plant Stress Responses and Tolerance
Umeå Plant Science Centre
2009-2018
Umeå University
2009-2018
University of Sheffield
2007-2009
Hungarian Academy of Sciences
2008
Institute of Plant Biology
2008
The PsbS subunit of photosystem II (PSII) plays a key role in nonphotochemical quenching (NPQ), the major photoprotective regulatory mechanism higher plant thylakoid membranes, but its action is unknown. Here we describe direct evidence that controls organization PSII and light harvesting system (LHCII). changes chlorophyll fluorescence amplitude associated with Mg(2+)-dependent restacking membranes were measured thylakoids prepared from wild-type plants, PsbS-deficient mutant overexpresser....
Abstract The main trimeric light-harvesting complex of higher plants (LHCII) consists three different Lhcb proteins (Lhcb1-3). We show that Arabidopsis thaliana T-DNA knockout lacking Lhcb3 (koLhcb3) compensate for the lack by producing increased amounts Lhcb1 and Lhcb2. As in wild-type plants, LHCII-photosystem II (PSII) supercomplexes were present (koLhcb3), preservation LHCII trimers (M trimers) indicates M has been replaced and/or However, rotational position trimer was altered,...
Abstract Background Plants exhibit phenotypic plasticity and respond to differences in environmental conditions by acclimation. We have systematically compared leaves of Arabidopsis thaliana plants grown the field under controlled low, normal high light laboratory determine their most prominent differences. Results Compared conditions, "indoor plants" had larger leaves, modified leaf shapes longer petioles. Their pigment composition also significantly differed; indoor reduced levels...
The PsbS protein is a critical component in the regulation of non‐photochemical quenching (NPQ) higher plant photosynthesis. Electron microscopy and image analysis grana membrane fragments from wild type mutant Arabidopsis plants showed that semi‐crystalline domains photosystem II supercomplexes were identical presence absence PsbS. However, frequency containing crystalline arrays was increased Conversely, there complete such membranes elevated amounts this protein. It proposed controls...
The cellular functions of two Arabidopsis (Arabidopsis thaliana) one-helix proteins, OHP1 and OHP2 (also named LIGHT-HARVESTING-LIKE2 [LIL2] LIL6, respectively, because they have sequence similarity to light-harvesting chlorophyll a/b-binding proteins), remain unclear. Tagged null mutants (ohp1 ohp2) showed stunted growth with pale-green leaves on agar plates, these were unable grow soil. Leaf fluorescence the composition thylakoid membrane proteins revealed that ohp1 deletion substantially...
Light-harvesting complex II (LHCII) contains three highly homologous chlorophyll-a/b-binding proteins (Lhcb1, Lhcb2 and Lhcb3), which can be assembled into both homo- heterotrimers. Lhcb1 are reversibly phosphorylated by the action of STN7 kinase PPH1/TAP38 phosphatase in so-called state-transition process. We have developed antibodies that specific for forms Lhcb2. found is more rapidly than Lhcb1: 10 sec 'state 2 light' results phosphorylation to 30% maximum level. Phosphorylated...