Reorganization of the photosystem II unit in developing thylakoids of higher plants after transfer to darkness. Changes in chlorophyll b, light-harvesting chlorophyll protein content, and grana stacking [Phaseolus vulgaris, kidney beans]

A light-dependent reversible grana stacking-unstacking process, paralleled by a reorganization of thylakoid components, has been noticed in greening etiolated bean (Phaseolus vulgaris, var. red kidney) leaves upon transfer to darkness. The reorganization, based on biochemical and biophysical criteri...

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Published in:Plant physiology (Bethesda) 1982-11, Vol.70 (5), p.1242-1248
Main Authors: Argyroudi-Akoyunoglou, Joan H., Akoyunoglou, Agapios, Kalosakas, Kostas, Akoyunoglou, George
Format: Article
Language:English
Subjects:
Chlorophylls
Chloroplasts
Fluorescence
Grana
Greening
Leaves
Optical reflection
Phaseolus vulgaris
photosystem II
Plants
Plastids
Thylakoids
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container_issue 5
container_start_page 1242
container_title Plant physiology (Bethesda)
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creator Argyroudi-Akoyunoglou, Joan H.
Akoyunoglou, Agapios
Kalosakas, Kostas
Akoyunoglou, George
description A light-dependent reversible grana stacking-unstacking process, paralleled by a reorganization of thylakoid components, has been noticed in greening etiolated bean (Phaseolus vulgaris, var. red kidney) leaves upon transfer to darkness. The reorganization, based on biochemical and biophysical criteria, involves mainly the photosystem II (PSII) unit components: upon transfer to darkness, the light-harvesting chlorophyll protein (LHCP), its 25 kilodalton polypeptide and chlorophyll b are decreased, while the CPa and its 42 kilodalton polypeptide are increased and new PSII units of smaller size are formed. This reorganization of components occurs only in thylakoids still in the process of development and not in those present in steady state conditions. It is proposed that this process does not reflect the turnover of the LHCP component per se, but a regulatory process operating during development, by which the ratio of light-harvesting to PSII reaction center components, determined by the environmental conditions, controls the photosynthetic rate.
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source Alma/SFX Local Collection; JSTOR
subjects Chlorophylls
Chloroplasts
Fluorescence
Grana
Greening
Leaves
Optical reflection
Phaseolus vulgaris
photosystem II
Plants
Plastids
Thylakoids
title Reorganization of the photosystem II unit in developing thylakoids of higher plants after transfer to darkness. Changes in chlorophyll b, light-harvesting chlorophyll protein content, and grana stacking [Phaseolus vulgaris, kidney beans]
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