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Plant and Cell Physiology, 2001, Vol. 42, No. 1 46-53
© 2001 Oxford University Press

Changes in Carboxysome Structure and Grouping and in Photosynthetic Affinity for Inorganic Carbon in Anabaena Strain PCC 7119 (Cyanophyta) in Response to Modification of CO2 and Na+ Supply

M. Isabel Orús1, M. Luisa Rodríguez-Buey, Eduardo Marco and Eduardo Fernández-Valiente

Departamento de Biología, Universidad Autónoma de Madrid, E-28049 Madrid, Spain

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.

1 Corresponding author: E-mail, mabel.orus@uam.es; Fax, +34-9-1397-8344.


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