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High Light Acclimation Mechanisms Deficient in a PsbS-Knockout Arabidopsis Mutant.


ABSTRACT: The photosystem II PsbS protein of thylakoid membranes is responsible for regulating the energy-dependent, non-photochemical quenching of excess chlorophyll excited states as a short-term mechanism for protection against high light (HL) stress. However, the role of PsbS protein in long-term HL acclimation processes remains poorly understood. Here we investigate the role of PsbS protein during long-term HL acclimation processes in wild-type (WT) and npq4-1 mutants of Arabidopsis which lack the PsbS protein. During long-term HL illumination, photosystem II photochemical efficiency initially dropped, followed by a recovery of electron transport and photochemical quenching (qL) in WT, but not in npq4-1 mutants. In addition, we observed a reduction in light-harvesting antenna size during HL treatment that ceased after HL treatment in WT, but not in npq4-1 mutants. When plants were adapted to HL, more reactive oxygen species (ROS) were accumulated in npq4-1 mutants compared to WT. Gene expression studies indicated that npq4-1 mutants failed to express genes involved in plastoquinone biosynthesis. These results suggest that the PsbS protein regulates recovery processes such as electron transport and qL during long-term HL acclimation by maintaining plastoquinone biosynthetic gene expression and enhancing ROS homeostasis.

SUBMITTER: Yang YN 

PROVIDER: S-EPMC8910700 | biostudies-literature | 2022 Feb

REPOSITORIES: biostudies-literature

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High Light Acclimation Mechanisms Deficient in a PsbS-Knockout Arabidopsis Mutant.

Yang Young Nam YN   Le Thi Thuy Linh TTL   Hwang Ji-Hye JH   Zulfugarov Ismayil S IS   Kim Eun-Ha EH   Kim Hyun Uk HU   Jeon Jong-Seong JS   Lee Dong-Hee DH   Lee Choon-Hwan CH  

International journal of molecular sciences 20220228 5


The photosystem II PsbS protein of thylakoid membranes is responsible for regulating the energy-dependent, non-photochemical quenching of excess chlorophyll excited states as a short-term mechanism for protection against high light (HL) stress. However, the role of PsbS protein in long-term HL acclimation processes remains poorly understood. Here we investigate the role of PsbS protein during long-term HL acclimation processes in wild-type (WT) and <i>npq4-1</i> mutants of <i>Arabidopsis</i> whi  ...[more]

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