Phytotron experiments were conducted to examine the impact of elevated atmospheric CO2 level (750 μmol mol−1) on the drought tolerance of winter barley (Petra), durum wheat (Mv Makaroni) and spring oat (Mv Pehely) varieties. Under drought stress conditions, the durum wheat variety was found to be unaffected by CO2 enrichment, as neither the biomass or grain yield nor the antioxidant enzyme activities changed compared to those at ambient CO2. Despite the fact that the spring oat variety had similar grain yield loss due to drought at both CO2 levels, it exhibited reduced antioxidant enzyme activities under less severe drought, indicating a slightly increased tolerance to drought. Winter barley, which exhibited an extremely positive reaction to CO2 enrichment at the control water supply level, also showed increased drought tolerance in response to high CO2. It had low glutathione reductase, glutathione-S-transferase and ascorbate peroxidase activities even at the most severe drought stress levels, while it could also fully compensate for the negative effects of drought on biomass and grain yield parameters when grown at elevated CO2.
Bencze, S., Bamberger, Z., Janda, T., Balla, K., Bedő, Z., Veisz, O. (2011): Drought tolerance in cereals in terms of water retention, photosynthesis and antioxidant enzyme activities. Cent. Eur. J. Biol,. 6, 376–387.
Veisz O. , 'Drought tolerance in cereals in terms of water retention, photosynthesis and antioxidant enzyme activities ' (2011 ) 6 Cent. Eur. J. Biol : 376 -387 .
Bencze, S., Veisz, O., Bedő, Z. (2004): Effects of high atmospheric CO2 and heat stress on phytomass, yield and grain quality of winter wheat. Cereal Res. Commun,. 32, 75–82.
Bedő Z. , 'Effects of high atmospheric CO2 and heat stress on phytomass, yield and grain quality of winter wheat ' (2004 ) 32 Cereal Res. Commun : 75 -82 .
Chaves, H. M., Pereira, J. S., Maroco, J., Rodrigues, M. L., Ricardo, C. P. P., Osório, M. L., Carvalho, I., Faria, T., Pinherio, C. (2002): How plants cope with water stress in the field. Photosynthesis and growth. Ann. Bot., 89, 907–916.
Pinherio C. , 'How plants cope with water stress in the field. Photosynthesis and growth ' (2002 ) 89 Ann. Bot. : 907 -916 .
Farrant, J. M., Bailly, C., Leymarie, J., Hamman, B., Come, D., Corbineau, F. (2004): Wheat seedlings as a model to understand the desiccation tolerance and sensitivity. Physiol. Plant., 120, 563–574.
Corbineau F. , 'Wheat seedlings as a model to understand the desiccation tolerance and sensitivity ' (2004 ) 120 Physiol. Plant. : 563 -574 .
Hameed, A., Bibi, N., Akhter, J., Iqbal, N. (2011): Differential changes in antioxidants, proteases, and lipid peroxidation in flag leaves of wheat genotypes under different levels of water deficit conditions. Plant Physiol. Biochem., 49, 178–185.
Iqbal N. , 'Differential changes in antioxidants, proteases, and lipid peroxidation in flag leaves of wheat genotypes under different levels of water deficit conditions ' (2011 ) 49 Plant Physiol. Biochem. : 178 -185 .
Harnos, N., Veisz, O., Tischner, T. (1998): Effects of elevated CO2 concentration on the development and yield components of cereals. Acta Agron. Hung., 46, 15–24.
Tischner T. , 'Effects of elevated CO2 concentration on the development and yield components of cereals ' (1998 ) 46 Acta Agron. Hung. : 15 -24 .
Högy, P., Wieser, H., Köhler, P., Schwadorf, K., Breuer, J., Franzaring, J., Muntifering, R., Fangmeier, A. (2009): Effects of elevated CO2 on grain yield and quality of wheat: results from a 3-year free-air CO2 enrichment experiment. Plant Biol., 11, 60–69.
Fangmeier A. , 'Effects of elevated CO2 on grain yield and quality of wheat: results from a 3-year free-air CO2 enrichment experiment ' (2009 ) 11 Plant Biol. : 60 -69 .
Janda, T., Cséplő, M., Németh, C., Vida, G., Pogány, M., Szalai, G., Veisz, O. (2008): Combined effect of water stress and infection with the necrotrophic fungal pathogen Drechslera triticirepentis on growth and antioxidant activity in wheat. Cereal Res. Commun., 36, 53–64.
Veisz O. , 'Combined effect of water stress and infection with the necrotrophic fungal pathogen Drechslera triticirepentis on growth and antioxidant activity in wheat ' (2008 ) 36 Cereal Res. Commun. : 53 -64 .
Keles, Y., Öncel, I. (2002): Response of antioxidative defence system to temperature and water stress combinations in wheat seedlings. Plant Sci., 163, 783–790.
Öncel I. , 'Response of antioxidative defence system to temperature and water stress combinations in wheat seedlings ' (2002 ) 163 Plant Sci. : 783 -790 .
Kendall, A. C., Turner, J. C., Thomas, S. M. (1985): Effects of CO2 enrichment at different irradiances on growth and yield of wheat II. J. Exp. Bot., 36, 261–263.
Thomas S. M. , 'Effects of CO2 enrichment at different irradiances on growth and yield of wheat II ' (1985 ) 36 J. Exp. Bot. : 261 -263 .
Kőmíves, T., Kőmíves, V., Gullner, G., Michelozzi, M., Tognetti, R., Raschi, A. (1997): Effects of environmental stress caused by elevated CO2 levels on the activity of glutathione Stransferase in plants, Acta Phytopathol. Entomol. Hung., 32, 259–264.
Raschi A. , 'Effects of environmental stress caused by elevated CO2 levels on the activity of glutathione Stransferase in plants ' (1997 ) 32 Acta Phytopathol. Entomol. Hung. : 259 -264 .
Kramer, P. J. (1981): Carbon dioxide concentration, photosynthesis, and dry matter production. Bioscience, 31, 29–33.
Kramer P. J. , 'Carbon dioxide concentration, photosynthesis, and dry matter production ' (1981 ) 31 Bioscience : 29 -33 .
Láng, L., Kuti, C., Bedő, Z. (2001): Computerized data management system for cereal breeding. Euphytica, 119, 235–240.
Bedő Z. , 'Computerized data management system for cereal breeding ' (2001 ) 119 Euphytica : 235 -240 .
Lawlor, D. W., Mitchell, R. A. C. (1991): The effects of increasing CO2 on crop photosynthesis and productivity — a review of field studies. Plant Cell Environ., 14, 807–818.
Mitchell R. A. C. , 'The effects of increasing CO2 on crop photosynthesis and productivity — a review of field studies ' (1991 ) 14 Plant Cell Environ. : 807 -818 .
Li, J., Zhou, J.-M., Duan, Z.-Q., Du, C.-W., Wang, H.-Y. (2007): Effect of CO2 enrichment on the growth and nutrient uptake of tomato seedlings. Pedosphere, 17, 343–351.
Wang H.-Y. , 'Effect of CO2 enrichment on the growth and nutrient uptake of tomato seedlings ' (2007 ) 17 Pedosphere : 343 -351 .
Lin, J.-S. Wang, G.-X. (2002): Doubled CO2 could improve the drought tolerance better in sensitive cultivars than in tolerant cultivars in spring wheat. Plant Sci., 163, 627–637.
Wang G.-X. , 'Doubled CO2 could improve the drought tolerance better in sensitive cultivars than in tolerant cultivars in spring wheat ' (2002 ) 163 Plant Sci. : 627 -637 .
McKee, I. F., Eiblmeier, M., Polle, A. (1997): Enhanced ozone-tolerance in wheat grown at an elevated CO2 concentration: ozone exclusion and detoxification. New Phytol., 137, 275–284.
Polle A. , 'Enhanced ozone-tolerance in wheat grown at an elevated CO2 concentration: ozone exclusion and detoxification ' (1997 ) 137 New Phytol. : 275 -284 .
Pogány, M., Harrach, B. D., Hafez, Y. M., Barna, B., Király, Z., Páldi, E. (2006): Role of reactive oxygen species in abiotic and biotic stresses in plants. Acta Phytopathol. Entomol. Hung., 41, 23–35.
Páldi E. , 'Role of reactive oxygen species in abiotic and biotic stresses in plants ' (2006 ) 41 Acta Phytopathol. Entomol. Hung. : 23 -35 .
Polle, A., Eiblmeier, M., Sheppard, L., Murray, M. (1997): Responses of antioxidative enzymes to elevated CO2 in leaves of beech (Fagus sylvatica L.) seedlings grown under a range of nutrient regimes. Plant, Cell Environ., 20, 1317–1321.
Murray M. , 'Responses of antioxidative enzymes to elevated CO2 in leaves of beech (Fagus sylvatica L.) seedlings grown under a range of nutrient regimes ' (1997 ) 20 Plant, Cell Environ. : 1317 -1321 .
Poorter, H., Roumet, C., Campbell, B. D. (1996): Interspecific variation in the growth response of plants to elevated CO2: A search for functional types. In: Körner, C., Bazzaz F.A. (eds.), Carbon dioxide. Populations, and Communities. Academic Press, New York, pp. 375–412.
Campbell B. D. , '', in Carbon dioxide. Populations, and Communities , (1996 ) -.
Pritchard, S. G., Ju, Z., van Santen, E., Qiu, J., Weaver, D. B., Prior, S. A., Rogers, H. H. (2000): The influence of elevated CO2 on the activities of antioxidative enzymes in two soybean genotypes. Aust. J. Plant Physiol., 27, 1061–1068.
Rogers H. H. , 'The influence of elevated CO2 on the activities of antioxidative enzymes in two soybean genotypes ' (2000 ) 27 Aust. J. Plant Physiol. : 1061 -1068 .
Sairam, R. K., Saxena, D. C. (2000): Oxidative stress and antioxidants in wheat genotypes: possible mechanism of water stress tolerance. J. Agron. Crop Sci., 184, 55–61.
Saxena D. C. , 'Oxidative stress and antioxidants in wheat genotypes: possible mechanism of water stress tolerance ' (2000 ) 184 J. Agron. Crop Sci. : 55 -61 .
Schwanz, P., Polle, A. (2001): Growth under elevated CO2 ameliorates defences against photo-oxidative stress in poplar (Populus alba × tremula). Environ. Exp. Bot., 45, 43–53.
Polle A. , 'Growth under elevated CO2 ameliorates defences against photo-oxidative stress in poplar (Populus alba × tremula) ' (2001 ) 45 Environ. Exp. Bot. : 43 -53 .
Tischner, T., Kőszegi, B., Veisz, O. (1997): Climatic programmes used in the Martonvásár Phytotron most frequently in recent years. Acta Agron. Hung., 45, 85–104.
Veisz O. , 'Climatic programmes used in the Martonvásár Phytotron most frequently in recent years ' (1997 ) 45 Acta Agron. Hung. : 85 -104 .
Tottman, D.R., Makepeace, R.J. (1979): An explanation of the decimal code for the growth stages of cereals, with illustrations. Ann. Appl. Biol., 93, 221–234.
Makepeace R.J. , 'An explanation of the decimal code for the growth stages of cereals, with illustrations ' (1979 ) 93 Ann. Appl. Biol. : 221 -234 .
Tuba, Z., Raschi, A., Nagy, Z., Helyes, L., Vodnik, D., Sanita di Toppi, L. (2003): Vegetations with various environmental constraints under elevated atmospheric CO2 concentrations. In: Sanita di Toppi, L., Pawlik-Skowronska, B. (eds.), Abiotic Stresses in Plants. Kluwer Academic Publishers, Dordrecht, pp. 157–204.
Sanita di Toppi L. , '', in Abiotic Stresses in Plants , (2003 ) -.
Tuba, Z., Szente, K., Koch, J. (1994): Response of photosynthesis, stomatal conductance, water use efficiency and production to long-term elevated CO2 in winter wheat. J. Plant Physiol., 144, 661–668.
Koch J. , 'Response of photosynthesis, stomatal conductance, water use efficiency and production to long-term elevated CO2 in winter wheat ' (1994 ) 144 J. Plant Physiol. : 661 -668 .
Zhang, J. X., Kirkham, M. B. (1984): Drought stress induced changes in activities of superoxide dismutase, catalase, and peroxidase in wheat species. Plant Cell Physiol., 35, 785–791.
Kirkham M. B. , 'Drought stress induced changes in activities of superoxide dismutase, catalase, and peroxidase in wheat species ' (1984 ) 35 Plant Cell Physiol. : 785 -791 .