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Indications for chlororespiration in relation to light regime in the marine diatom Thalassiosira weissflogii.

Dijkman, N.A. and Kroon, B.M.A. (2002) Indications for chlororespiration in relation to light regime in the marine diatom Thalassiosira weissflogii. Journal of Photochemistry and Photobiology B: Biology, 66, 179-187. ISSN 1011-1344.

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Official URL: http://dx.doi.org/10.1016/S1011-1344(02)00236-1

Abstract

The marine diatom Thalassiosira weissflogii was cultured under a light regime simulating the daily rise and fall of the sun. The light regime caused a daily cycle in non-photochemical quenching. Remarkable were the changes in fluorescence directly after a light-to-dark transition that occurred in addition to the changes induced by non-photochemical quenching. A transient non-photochemical reduction of PQ and of QA was indicated by a transient increase in apparent Fo and by changes in the shape of the fluorescence induction curve. The observed changes developed approximately the first 100¯120 s after a light-to-dark transition and could be reversed by the application of far-red illumination. Chlororespiration is thought to cause the reduction of PQ and, as the PQ-pool is in equilibrium with QA, also a reduction of QA. The function and ecological relevance of chlororespiration are discussed. [KEYWORDS: Chlororespiration; Dynamic light; Electron transport; Fluorescence; Fluorescence induction; Thalassiosira weissflogii]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:11140
Deposited On:24 Nov 2011 01:00
Last Modified:31 Mar 2014 10:14

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