Author： Masamoto Kazumori Hisatomi Shin-ichiro Sakurai Isamu Gombos Zoltán Wada Hajime
Publisher： Oxford University Press
ISSN： 0032-0781
Source： Plant and Cell Physiology, Vol.45, Iss.9, 2004-09, pp. : 1325-1329
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Abstract
Carotene isomerase mutant (crtH mutant) cells of Synechocystis sp. PCC 6803 can accumulate β-carotene under light conditions. However, the mutant cells grown under a light-activated heterotrophic growth condition contained detectable levels of neither β-carotene nor D1 protein of the photosystem (PS) II reaction center, and no oxygen-evolving activity of PSII was detected. β-Carotene and D1 protein appeared and a high level of PSII activity was detected after the cells were transferred to a continuous light condition. The PSI activities of thylakoid membranes from mutant cells were almost the same as those of thylakoid membranes from wild-type cells, both before and after transfer to the continuous light condition. These results suggest that β-carotene is required for the assembly of PSII but not for that of PSI.
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