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Light-induced Dissociation of an Antenna Hetero-oligomer Is Needed for Non-photochemical Quenching Induction
PsbS controls the association/dissociation of a five-subunit membrane complex, composed of two monomeric Lhcb proteins (CP29 and CP24) and the trimeric LHCII-M and shows that changes are reversible and do not require protein synthesis/degradation, thus allowing for changes in PSII antenna size and adaptation to rapidly changing environmental conditions. Expand
Interaction between avoidance of photon absorption, excess energy dissipation and zeaxanthin synthesis against photooxidative stress in Arabidopsis.
It is concluded that a decrease in leaf optical density affects the apparent non-photochemical quenching (NPQ) rise kinetic, and excess light-induced fluorescence decrease is in part due to avoidance of photon absorption rather than to a genuine quench process. Expand
The Occurrence of the psbS Gene Product in Chlamydomonas reinhardtii and in Other Photosynthetic Organisms and Its Correlation with Energy Quenching †
By correlating growth habitat and PsbS accumulation in different species, it is suggested that during the evolution the light environment has been a determinant factor for the conservation/loss of the psbS function. Expand
Arabidopsis Mutants Deleted in the Light-Harvesting Protein Lhcb4 Have a Disrupted Photosystem II Macrostructure and Are Defective in Photoprotection[C][W]
Analysis of a series of mutants lacking each of the three isoforms of the Lhcb4 light-harvesting complex in Arabidopsis showed that this complex plays an important role in the macro-organization andExpand
On the origin of a slowly reversible fluorescence decay component in the Arabidopsis npq4 mutant
The kinetics of NPQ in PsbS-depleted mutants of Arabidopsis are investigated and it is shown that red light was less effective than white light in decreasing maximal fluorescence in npq4 mutants, implying that fluorescence decay is the result of decreased photon absorption caused by chloroplast relocation rather than a change in the activity of quenching reactions. Expand
Different Roles of α- and β-Branch Xanthophylls in Photosystem Assembly and Photoprotection*
In depth analysis of the mutant phenotypes suggests that α-br branch (lutein) and β-branch (zeaxanthin, violaxanth in, and neoxanthin) xanthophylls have distinct and complementary roles in antenna protein assembly and in the mechanisms of photoprotection. Expand
Enhanced photoprotection by protein-bound vs free xanthophyll pools: a comparative analysis of chlorophyll b and xanthophyll biosynthesis mutants.
It is proposed that the antioxidant capacity of zeaxanthin is empowered in the presence of PSII-LHCs-Zea complexes, while its effect on enhancement of qE only provides a minor contribution to chloroplast photoprotection. Expand
Domestication of the green alga Chlorella sorokiniana: reduction of antenna size improves light-use efficiency in a photobioreactor
These results suggest that generation of mutants with low chlorophyll content can significantly improve the light-to-biomass conversion efficiency of C. sorokiniana, suggesting that selection should include evaluation of multiple independent mutants for each desired phenotype. Expand
The Arabidopsis aba4-1 Mutant Reveals a Specific Function for Neoxanthin in Protection against Photooxidative Stress[W]
It is concluded that neoxanthin preserves PSII from photoinactivation and protects membrane lipids from photooxidation by reactive oxygen species. Expand
The Arabidopsis szl1 Mutant Reveals a Critical Role of β-Carotene in Photosystem I Photoprotection1[C][W]
It is concluded that carotene depletion in the core complexes impairs photoprotection of both PS under high light at chilling temperature, with PSI being far more affected than PSII. Expand