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
| Autor: | M. Luisa Rodríguez-Buey, E. Marco, M. Isabel Orús, Eduardo Fernández-Valiente |
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| Rok vydání: | 2001 |
| Předmět: |
Cyanobacteria
Time Factors Physiology Na deficiency Ribulose-Bisphosphate Carboxylase Plant Science Photosynthesis Acclimatization Total inorganic carbon Botany Cells Cultured Organelles biology Chemistry Anabaena Sodium Cell Biology General Medicine Carbon Dioxide biology.organism_classification Carbon Microscopy Electron Carboxysome Biophysics Aeration |
| Zdroj: | Plant and Cell Physiology. 42:46-53 |
| ISSN: | 1471-9053 0032-0781 |
| DOI: | 10.1093/pcp/pce005 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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