Biogenesis of water splitting by photosystem II during de-etiolation of barley (Hordeum vulgare L.)

Plant, Cell & Environment
Dmitriy ShevelaLutz A Eichacker

Abstract

Etioplasts lack thylakoid membranes and photosystem complexes. Light triggers differentiation of etioplasts into mature chloroplasts, and photosystem complexes assemble in parallel with thylakoid membrane development. Plastids isolated at various time points of de-etiolation are ideal to study the kinetic biogenesis of photosystem complexes during chloroplast development. Here, we investigated the chronology of photosystem II (PSII) biogenesis by monitoring assembly status of chlorophyll-binding protein complexes and development of water splitting via O2 production in plastids (etiochloroplasts) isolated during de-etiolation of barley (Hordeum vulgare L.). Assembly of PSII monomers, dimers and complexes binding outer light-harvesting antenna [PSII-light-harvesting complex II (LHCII) supercomplexes] was identified after 1, 2 and 4 h of de-etiolation, respectively. Water splitting was detected in parallel with assembly of PSII monomers, and its development correlated with an increase of bound Mn in the samples. After 4 h of de-etiolation, etiochloroplasts revealed the same water-splitting efficiency as mature chloroplasts. We conclude that the capability of PSII to split water during de-etiolation precedes assembly of the PSII-LH...Continue Reading

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Citations

Oct 30, 2016·Bio Systems·Anton SemenchenkoA P F Atman
Nov 11, 2020·Proceedings of the National Academy of Sciences of the United States of America·Sergey KosourovYagut Allahverdiyeva
Apr 2, 2021·Plant Physiology·Han-Yi FuMark Aurel Schöttler

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