Can I read Plastoquinone Homeostasis in Plant Acclimation to Light Intensity on EtoBox?

Plastoquinone Homeostasis in Plant Acclimation to Light Intensity by Brigitte Ksas; Jean Alric; Stefano Caffarri; Michel Havaux is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is Plastoquinone Homeostasis in Plant Acclimation to Light Intensity about?

Arabidopsis plants were grown from seeds at different photon flux densities (PFDs) of white light ranging from 65 to 800 μmol photons m −2 s −1 . Increasing PFD brought about a marked accumulation of plastoquinone (PQ) in leaves. However, the thylakoid photoactive PQ pool, estimated to about 700 pmol mg −1 leaf dry weight, was independent of PFD; PQ accumulation in high light mostly occurred in the photochemically non-active pool (plastoglobules, chloroplast envelopes) which represented up to 75% of total PQ. The amounts of PSII reaction center (on a leaf dry weight basis) also were little affected by PFD during growth, leading to a constant PQ/PSII ratio at all PFDs. Boosting PQ biosynthesis by overexpression of a solanesyl diphosphate-synthesizing enzyme strongly enhanced the PQ levels, particularly at high PFDs. Again, this accumulation occurred exclusively in the non-photoactive PQ pool. Mutational suppression of the plastoglobular ABC1K1 kinase led to a selective reduction of the thylakoid PQ pool size to ca. 400 pmol mg −1 in a large range of PFDs, which was associated with a restriction of the photosynthetic electron flow. Our results show that photosynthetic acclimation to

Who reads Plastoquinone Homeostasis in Plant Acclimation to Light Intensity?

Author

Brigitte Ksas; Jean Alric; Stefano Caffarri; Michel Havaux

Publisher

Springer Science and Business Media LLC

Published

2022

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)