Abstract
The CO2-concentrating mechanism (CCM) was induced in the green unicellular alga Chlorella when cells were transferred from high (5% CO2) to low (0.03%) CO2 concentrations. The induction of the CCM correlated with the formation of a starch sheath specifically around the pyrenoid in the chloroplast. With the aim of clarifying whether the starch sheath was involved in the operation of the CCM, we isolated and physiologically characterized a starchless mutant of Chlorella pyrenoidosa, designated as IAA-36. The mutant strain grew as vigorously as the wild type under high and low CO2 concentrations, continuous light and a 12 h light/12 h dark photoperiod. The CO2 requirement for half-maximal rates of photosynthesis [K0.5(CO2)] decreased from 40 μM to 2–3 μM of CO2 when both wild type and mutant were switched from high to low CO2. The high affinity for inorganic carbon indicates that the IAA-36 mutant is able to induce a fully active CCM. Since the mutant does not have the pyrenoid starch sheath, we conclude that the sheath is not involved in the operation of the CCM in Chlorella cells.
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Abbreviations
- CCM:
-
CO2 concentrating mechanism; high
- CO2 :
-
air supplemented with 5% CO2 (v/v)
- low CO2 :
-
air containing ambient 0.03% CO2 (v/v)
- WT:
-
wild type
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authors thank Prof. L.A. Kleczkowski (University of Umea, Umea, Sweden) for critical reading of the manuscript.
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del Pino Plumed, M., Villarejo, A., de los Róos, A. et al. The CO2-concentrating mechanism in a starchless mutant of the green unicellular alga Chlorella pyrenoidosa . Planta 200, 28–31 (1996). https://doi.org/10.1007/BF00196645
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DOI: https://doi.org/10.1007/BF00196645