Abstract
The photosynthetic properties of a range of lichens containing both green algal (11 species) and cyanobacterial (6 species) photobionts were examined with the aim of determining if there was clear evidence for the operation of a CO2-concentrating mechanism (CCM) within the photobionts. Using a CO2-gas-exchange system, which allowed resolution of fast transients, evidence was obtained for the existence of an inorganic carbon pool which accumulated in the light and was released in the dark. The pool was large (500–1000 nmol · mg Chl) in cyanobacterial lichens and about tenfold smaller in green algal lichens. In Hypogymnia physodes (L.) Nyl., which contains the green alga Trebouxia jamesii, a small inorganic carbon pool was rapidly formed in the light. Carbon dioxide was released from this pool into the gas phase upon darkening within about 20 s when photosynthesis was inhibited by the carbon-reduction-cycle inhibitor glycolaldehyde. In the absence of this inhibitor, release appeared to be obscured by carboxylation of ribulose bisphosphate. The kinetics of CO2 uptake and release were monophasic. The operation of an active CCM could be distinguished from passive accumulation and release accompanying the reversible light-dependent alkalization of the stroma by the presence of saturation characteristics with respect to external CO2. In Peltigera canina (L.) Willd., which contains the cyanobacterium Nostoc sp., a larger CO2 pool was taken up over a longer period in the light and the release of this pool in the dark was slow, lasting 3–5 min. This pool also accumulated in the presence of glycolaldehyde, and under these conditions the CO2 release was biphasic. In both species, photosynthesis at low CO2 was inhibited by the carbonic-anhydrase inhibitor ethoxyzolamide (EZ). Inhibition could be reversed fully or to a considerable extent by high CO2. In Peltigera, EZ decreased both the accumulation of the CO2 pool by the CCM and the rate of photosynthesis. Free-living cultures of Nostoc sp. showed a similar effect of EZ on photosynthesis, although it was more dramatic than that seen with the lichen thalli. In contrast, in Hypogymnia, EZ actually increased the size of the CO2 pool, although it inhibited photosynthesis. This effect was also seen when glycolaldehyde was present together with EZ. Surprisingly, EZ did not alter the kinetics of either CO2 uptake or release. Taken together, the evidence indicates the operation in cyanobacterial lichens of a CCM which is capable of considerable elevation of internal CO2 and is similar to that reported for free-living cyanobacteria. The CCM of green algal lichens accumulates much less CO2 and is probably less effective than that which operates in cyanobacterial lichens.
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Abbreviations
- AZ:
-
acetazolamide or N-[5-sulfamoyl-1,3,4-thiadiazole-2-yl]acetamide
- CA:
-
carbonic anhydrase
- DIC:
-
dissolved inorganic carbon (CO2 + HCO sup−inf3 + CO sup2−inf3 )
- CCM:
-
CO2-concentrating mechanism
- Hepps:
-
N-[2-hydroxyethyl]piperazine-N′;-[3-propanesulfonic acid]
- EZ:
-
ethoxyzolamide or 6-ethoxy-2-benzothiazole-sulfonamide
- Rubisco:
-
ribulose bisphosphate carboxylase-oxygenase
References
Badger, M.R. (1987) The CO2 concentrating mechanism in aquatic phototrophs. In: The biochemistry of plants: A comprehensive treatise, vol 10: Photosynthesis, pp. 219–274, Hatch, M.D., Boardman, N.K., eds. Academic Press, London
Badger, M.R., Andrews, T.J. (1987) Co-evolution of rubisco and CO2 concentrating mechanisms. In: Progress in photosynthesis research, vol. III, pp. 601–609, Biggins, J., ed., Martinus Nijhoff, Dordrecht
Badger, M.R., Gallagher, A. (1987) Adaptation of photosynthetic CO2 and HCO −3 accumulation by the cyanobacterium Synechococcus PCC6301 to growth at different inorganic carbon concentrations. Aust. J. Plant Physiol. 14, 189–210
Badger, M.R., Price, G.D. (1992) The CO2 concentrating mechanism in cyanobacteria and microalgae. Physiol. Plant. 84, 606–615
Badger, M.R., Kaplan, A., Berry, J.A. (1980) Internal inorganic carbon pool of Chlamydomonas reinhardtii. Evidence for a carbon dioxide concentrating mechanism. Plant Physiol. 66, 407–413
Badger, M.R., Bassett, M., Comins, H.N. (1985) A model for HCO −3 accumulation and photosynthesis in the cyanobacterium Synechococcus sp. Plant Physiol. 77, 465–4171
Bauer, H. (1980) Net photosynthetic CO2 compensation concentrations of some lichens. Z. Pflanzenphysiol. 114, 45–50
Bowes, G., Berry, J.A. (1972) The effect of oxygen on photosynthesis and glycolate excretion in Chlamydomonas reinhardtii. Carnegie Inst. Washington Yearb. 72, 148–158
Bruns-Strenge, S., Lange, O.L. (1992) Photosynthetische Primärproduktion der Flechte Cladonia portentosa an einem Dünenstandort auf der Nordseeinsel Baltrum. III. Anwendung des Photosynthesemodells zur Simulation von Tagesläufen des CO2-Gaswechsels und zur Abschätzung der Jahresproduktion. Flora 186, 127–140
Coleman, J.R. (1991) The molecular and biochemical analyses of CO2 concentrating mechanisms in cyanobacteria and microalgae. Plant Cell Environ. 14, 861–867
Cowan, I.R., Lange, O.L., Green, T.G.A. (1992) Carbon-dioxide exchange in lichens: determination of transport and carboxylation characteristics. Planta 187, 282–294
Edwards, G., Walker, D.A. (1983) C3, C4: Mechanisms and cellular and environmental regulation of photosynthesis. Blackwell, Oxford
Friedl, T. (1989) Systematik und Biologie von Trebouxia als Phycobiont der Parmeliaceae. Ph. D. Thesis Universität Bayreuth, FRG
Green, T.G.A., Snelgar, W.P., Wilkins, A.L. (1985) Photosynthesis, water relations and thallus structure of Stictaceae lichens. In: Lichen physiology and cell biology, pp. 57–75, Brown, D.H., ed. Plenum Press, New York London
Kaplan, A., Badger, M.R., Berry, J.A. (1980) Photosynthesis and the intracellular inorganic carbon pool in the blue-green alga Anabaena variabilis: Response to external CO2 concentration. Planta 149, 219–226
Kaplan, A., Schwarz, R., Lieman-Hurwitz, J., Reinhold, L. (1991) Physiological and molecular aspects of the inorganic carbon concentrating mechanism in cyanobacteria. Plant Physiol. 97, 851–855
Laisk, A., Oja, V., Kiirats, O., Raschke, K., Heber, U. (1989) The state of the photosynthetic apparatus in leaves as analyzed by rapid gas exchange and optical methods: The pH of the chloroplast stroma, and activation of enzymes in vivo. Planta 177, 350–358
Lange, O. (1988) Ecophysiology of photosynthesis: performance of poikilohydric lichens and homoiohydric mediterranean sclerophylls. J. Ecol. 76, 915–937
Lange, O.L., Ziegler, H. (1986) Different limiting processes of photosynthesis in lichens. In: Biological control of photosynthesis, pp. 147–161, Marcelle, R., Cliptern H., von Pouche, M., eds. Martinus Nijhoff Publishers, Dordrecht
Lange, O.L., Green, T.G.A., Ziegler, H. (1988) Water status related photosynthesis and carbon isotope discrimination in species of the lichen genus Pseudocyphellaria with green or blue-green photobionts and in photosymbiodemes. Oecologia 75, 494–501
McKay, R.M.L., Gibbs, S.P. (1989) Immunocytochemical localization of ribulose 1,5-bisphosphate carboxylase/oxygenase in light-limited and light-saturated cells of Chlorella pyrenoidosa. Protoplasma 149, 31–37
Màguas, C., Griffiths, H. (1992) Different carbon isotope discrimination characteristics in green algal and cyanobacterial photobiont lichens. Abstracts supplement, The Second International Lichenological Symposium, IAL 2., Kärnefelt, I., ed. Lund 1992
Mayo, W.P., Williams, T.G., Birch, D.G., Turpin, D.H. (1986) Photosynthetic adaptation by Synechococcus leopoliensis in response to exogenous dissolved inorganic carbon. Plant Physiol. 80, 1038–1041
Miller, A.G., Canvin, D.T. (1989) Glycolaldehyde inhibits CO2 fixation in the cyanobacterium Synechococcus UTEX 625 without inhibiting the accumulation of inorganic carbon or the associated quenching of chlorophyll a fluorescence. Plant Physiol. 91, 1044–1049
Miller, A.G., Espie, G.S., Canvin, D.T. (1990) Physiological aspects of CO2 and HCO −3 transport by cyanobacterium: a review. Can. J. Bot. 68, 1291–1302
Moroney, J.V., Husic, H.D., Tolbert, N.E. (1985) Effects of carbonic anhydrase inhibitors on inorganic carbon accumulation by Chlamydomonas reinhardtii. Plant Physiol. 79, 177–183
Ogawa, T. (1990) Mutants of Synechocystis PCC6803 defective in inorganic carbon transport. Plant Physiol. 94, 760–765
Oja, V., Laisk, A., Heber, U. (1986) Light induced alkalization of the chloroplast stroma in vivo as estimated from the CO2 capacity of intact sunflower leaves. Biochim. Biophys. Acta 849, 355–365
Palmqvist, K. (1993) Photosynthetic CO2-use efficiency in lichens and their isolated photobionts: the possible role of a CO2-concentrating mechanism. Planta 191, 50–58
Pfanz, H., Heber, U. (1986) Buffer capacities of leaves, leaf cells and leaf cell organelles in relation to fluxes of potentially acidic gases. Plant Physiol. 81, 597–602
Price, G.D., Badger, M.R. (1989a) Ethoxyzolamide inhibition of CO2-dependent photosynthesis in the cyanobacterium Synechococcus PCC 7942. Plant Physiol. 89, 44–50
Price, G.D., Badger, M.R. (1989b) Ethoxyzolamide inhibition of CO2 uptake in the cyanobacterium Synechococcus PCC7942 without apparent inhibition of internal carbonic anhydrase activity. Plant Physiol. 89, 37–43
Price, G.D., Badger, M.R. (1989c) Expression of human carbonic anhydrase in the cyanobacterium Synechococcus PCC7942 creates a high CO2-requiring phenotype. Plant Physiol. 91, 505–513
Price, G.D., Badger, M.R. (1989d) Isolation and characterization of high-CO2 requiring mutants of the cyanobacterium Synechococcus PCC7942: Two phenotypes that accumulate inorganic carbon but are unable to generate CO2 within the carboxysome. Plant Physiol. 91, 514–525
Price, G.D., Coleman, J.R., Badger, M.R. (1992) Association of carbonic anhydrase activity with carboxysomes isolated from the cyanobacterium Synechococcus PCC7942. Plant Physiol. 100, 784–793
Raven, J.A., Johnston, A.M., Handley, L.L., McInroy, S.G. (1990) Transport and assimilation of inorganic carbon by Lichina pygmaea under emersed and submersed conditions. New Phytol. 114, 407–417
Rickli, E.E., Ghanzanfar, S.A.S., Gibbons, B.H., Edsall, J.T. (1964) Carbonic anhydrase from human erythrocytes. J. Biol. Chem. 239, 1065–1075
Ripka, R., Waterbury, J.B., Stanier, R.Y. (1981) Isolation and purification of cyanobacteria: Some general principles. In: The prokaryotes, pp. 212–220, Starr, M.P., Stolp, H., Trüper, H.G., Balows, A., Schlegel, H.G., eds. Springer, Berlin
Ronen, R., Galun, M. (1984) Pigment extraction from lichens with dimethyl sulphoxide (DMSO) and estimation of chlorophyll degradation. Environ. Exp. Bot. 24, 239–245
Snelgar, W.P., Green, T.G.A. (1980) Carbon dioxide exchange in lichens: low carbon dioxide compensation levels and lack of apparent photorespiratory activity in some lichens. Bryologist 83, 505–507
Spalding, M.H., Ogren, W.L. (1983) Evidence for a saturable transport component in the inorganic carbon uptake of Chlamydomonas reinhardtii. FEBS Lett. 154, 335–338
Sültemeyer, D.F., Fock, H.P., Canvin, D.T. (1990) Mass spectrometric measurements of intracellular carbonic anhydrase activity in high and low Ci cells of Chlamydomonas. Plant Physiol. 94, 1250–1257
Suzuki, K., Spalding, M.H. (1989) Adaptation of Chlamydomonas reinhardtii high-CO2 requiring mutants to limiting CO2. Plant Physiol. 90, 1195–1200
Yakota, A., Kitaoka, S. (1985) Correct pK values for dissociation constant of carbonic acid lower the reported Km of ribulose bisphosphate carboxylase to half. Presentations of nomograph and an equation for determining the pK values. Biochem. Biophys. Res. Comm. 131, 1075–1079
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This research was supported by the Deutsche Forschungsgemeinschaft (DFG) as a project of the “Sonderforschungsbereich 251 der Universität Würzburg”. M.R.B. gratefully acknowledges the support of a Fellowship from the DFG-Graduiertenkolleg der Universität Würzburg and a travel grant from the Australian National University under its Overseas Study Program. We would like to acknowledge the excellent technical assistance of Ms. B. Bruch and Ms. D. Faltenbacher-Werner, the help of Ms. S. Neimanis in setting up the gas-exchange system and Dr. T.G.A. Green (Department of Biological Sciences, the University of Waikato, Hamilton, New Zealand) for supplying the New Zealand lichens and helpful comments on the manuscript. We would also like to thank Dr. Kristin Palmqvist who made her manuscript available to us prior to submission.
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Badger, M.R., Pfanz, H., Büdel, B. et al. Evidence for the functioning of photosynthetic CO2-concentrating mechanisms in lichens containing green algal and cyanobacterial photobionts. Planta 191, 57–70 (1993). https://doi.org/10.1007/BF00240896
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DOI: https://doi.org/10.1007/BF00240896