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Plant and Cell Physiology Advance Access published online on September 10, 2008
Plant and Cell Physiology, doi:10.1093/pcp/pcn139
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© The Author 2008. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Properties of Mutants of Synechocystis sp. Strain PCC 6803 Lacking Inorganic Carbon Sequestration Systems

Min Xu1, Gábor Bernát2, Abhay Singh3, Hualing Mi1, Matthias Rögner2, Himadri B. Pakrasi3 and Teruo Ogawa1,2,3,*

1National Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institute for Biological Sciences, Graduate courses of the Chinese Academy of Sciences, Shanghai, 200032, China,
2Plant Biochemistry, Ruhr-University Bochum, D-44801 Bochum, Germany
3Department of Biology, Box 1137, Washington University, St. Louis, MO 63130, USA

*Corresponding author: Dr. Teruo Ogawa, National Laboratory of Plant Molecular Genetics, Institute of Plant Physiology and Ecology, Shanghai Institute for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200032, China, e-mail: ogawater{at}xd6.so-net.ne.jp, tel: +81-4-2944-5625


  Abstract

A mutant ({triangleup}5) of Synechocystis sp. strain PCC 6803 constructed by inactivating 5 inorganic carbon sequestration systems did not take up CO2 or HCO3- and was unable to grow in air with or without glucose. The {triangleup}4 mutant in which BicA is the only active inorganic carbon sequestration system showed low activity of HCO3- uptake and grew under these conditions but more slowly than the wild-type strain. The {triangleup}5 mutant required 1.7% CO2 to attain half the maximal growth rate. Electron transport activity of the mutants was strongly inhibited under high light intensities with the {triangleup}5 mutant more susceptible to high light than the {triangleup}4 mutant. The results implicated the significance of carbon sequestration in dissipating excess light energy.

Keywords: Inorganic carbon sequestration - CO2 and HCO3- uptake - CO2 - concentrating mechanism (CCM) - cyanobacteria - electron transport

(Received June 25, 2008; Accepted September 8, 2008)
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