Journal Article

Changes in Carboxysome Structure and Grouping and inPhotosynthetic Affinity for Inorganic Carbon in <i>Anabaena</i> StrainPCC 7119 (Cyanophyta) in Response to Modification of CO<sub>2</sub> andNa<sup>+</sup> Supply

M.Isabel Orús, M. Luisa Rodríguez-Buey, Eduardo Marco and Eduardo Fernández-Valiente

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 42, issue 1, pages 46-53
Published in print January 2001 | ISSN: 0032-0781
Published online January 2001 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pce005
Changes in Carboxysome Structure and Grouping and inPhotosynthetic Affinity for Inorganic Carbon in Anabaena StrainPCC 7119 (Cyanophyta) in Response to Modification of CO2 andNa+ Supply

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In Anabaena PCC 7119 a 4-fold decrease in the value of the apparent photosynthetic affinity for external inorganic carbon [K1/2 (Ci)] occurred between 9 and 12 h after the transfer from high-CO2 (2% CO2-enriched air) to air-growing conditions. A slight increase in carboxysome frequency occurred, but during this transition their appearance and distribution remained unchanged. Anabaena PCC 7119 did not improve its K1/2 (Ci) beyond the above cited level of acclimation neither by culturing the cyanobacteria in Na+-deficient medium in air nor by aeration with CO2-depleted air. In air-grown cultures, Na+ deficiency induced a large increase in carboxysome frequency and an alteration of their appearance: the greatest proportion were electron-dense whereas this type constituted a minority in high-CO2 and in air, Na+-sufficient conditions. It also induced major changes in carboxysome distribution, whereby more than 60% were grouped, compared with only 10% in high-CO2 and in air, Na+-sufficient conditions. These changes in carboxysome expression were extremely rapid, occurring mainly during the first 2 h.

Keywords: Key words: Anabaena — Carboxysome — CO2-concentrating mechanism — Cyanobacteria — Na+ deficiency — Photosynthetic affinity for Ci.; Abbreviations: CCM, CO2-concentrating mechanism; Ci, inorganic carbon; HCRM, high-carbon requiring mutant; K1/2 (Ci), apparent photosynthetic affinity for external inorganic carbon; Rubisco, Ribulose-1,5-bisphosphate carboxylase/oxygenase.

Journal Article.  4854 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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