Difference between revisions of "Booth 1991 Phycologia"
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|title=Booth WA, Beardall J | |title=Booth WA, Beardall J (1991) Effects of salinity on inorganic carbon utilization and carbonic anhydrase activity in the halotolerant alga ''Dunaliella salina'' (Chlorophyta). Phycologia 30:220-5. | ||
|info=[https://www.tandfonline.com/doi/abs/10.2216/i0031-8884-30-2-220.1?journalCode=uphy20] | |info=[https://www.tandfonline.com/doi/abs/10.2216/i0031-8884-30-2-220.1?journalCode=uphy20] | ||
|authors=Booth WA, Beardall John | |authors=Booth WA, Beardall John | ||
|year=1991 | |year=1991 | ||
|journal=Phycologia | |journal=Phycologia | ||
|abstract=Gas exchange characteristics of the halotolerant unicellular alga Dunaliella salina (Dunal) Teodoresco (Chlorophyta) were examined over a range of 0.21 m to 2.22 m NaCl. Cells of D. salina demonstrated a high affinity in photosynthesis for CO2 and HCO3β, suggesting that ribulose-1,5-P2 oxygenase activity is inhibited and photorespiration is consequently suppressed as a result of the activity of a CO2-concentrating mechanism (CCM). The affinity in photosynthesis for CO2 was more pronounced in cells grown at higher NaCl concentrations, with a KΒ½(Co2) for photosynthesis of 0.15 ΞΌm at the highest salinity employed (2.22 m NaCl). The activity (and percentage total activity) of carbonic anhydrase accessible at the cell surface was observed to increase substantially with increasing NaCl concentration. Increases in external carbonic anhydrase activity correlated closely with increased affinity for CO2 and HCO3β in photosynthesis, reflecting the importance of external carbonic anhydrase for the effective functioning of the CCM in D. salina. It is suggested that CO2 is the species of inorganic carbon that crosses the plasmalemma in a process facilitated by the action of extracellular carbonic anhydrase. | |abstract=Gas exchange characteristics of the halotolerant unicellular alga ''Dunaliella salina'' (Dunal) Teodoresco (Chlorophyta) were examined over a range of 0.21 m to 2.22 m NaCl. Cells of D. salina demonstrated a high affinity in photosynthesis for CO2 and HCO3β, suggesting that ribulose-1,5-P2 oxygenase activity is inhibited and photorespiration is consequently suppressed as a result of the activity of a CO2-concentrating mechanism (CCM). The affinity in photosynthesis for CO2 was more pronounced in cells grown at higher NaCl concentrations, with a KΒ½(Co2) for photosynthesis of 0.15 ΞΌm at the highest salinity employed (2.22 m NaCl). The activity (and percentage total activity) of carbonic anhydrase accessible at the cell surface was observed to increase substantially with increasing NaCl concentration. Increases in external carbonic anhydrase activity correlated closely with increased affinity for CO2 and HCO3β in photosynthesis, reflecting the importance of external carbonic anhydrase for the effective functioning of the CCM in D. salina. It is suggested that CO2 is the species of inorganic carbon that crosses the plasmalemma in a process facilitated by the action of extracellular carbonic anhydrase. | ||
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{{Labeling | {{Labeling | ||
|additional=Photosynthesis, Algae | |additional=Photosynthesis, Algae | ||
}} | }} | ||
Revision as of 10:15, 11 September 2021
| Booth WA, Beardall J (1991) Effects of salinity on inorganic carbon utilization and carbonic anhydrase activity in the halotolerant alga Dunaliella salina (Chlorophyta). Phycologia 30:220-5. |
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Booth WA, Beardall John (1991) Phycologia
Abstract: Gas exchange characteristics of the halotolerant unicellular alga Dunaliella salina (Dunal) Teodoresco (Chlorophyta) were examined over a range of 0.21 m to 2.22 m NaCl. Cells of D. salina demonstrated a high affinity in photosynthesis for CO2 and HCO3β, suggesting that ribulose-1,5-P2 oxygenase activity is inhibited and photorespiration is consequently suppressed as a result of the activity of a CO2-concentrating mechanism (CCM). The affinity in photosynthesis for CO2 was more pronounced in cells grown at higher NaCl concentrations, with a KΒ½(Co2) for photosynthesis of 0.15 ΞΌm at the highest salinity employed (2.22 m NaCl). The activity (and percentage total activity) of carbonic anhydrase accessible at the cell surface was observed to increase substantially with increasing NaCl concentration. Increases in external carbonic anhydrase activity correlated closely with increased affinity for CO2 and HCO3β in photosynthesis, reflecting the importance of external carbonic anhydrase for the effective functioning of the CCM in D. salina. It is suggested that CO2 is the species of inorganic carbon that crosses the plasmalemma in a process facilitated by the action of extracellular carbonic anhydrase.
Labels:
Photosynthesis, Algae
