Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2002.798.801Triticum aestivum L. Cvs. Sesquehanna and Gore) to Elevated Levels of Ozone]]>AliA. A.MulchiC. L.HassanI.A. El-ZawahryY. A.7200257Open-top chambers (OTCs) were conducted to determine interactive effects of atmospheric CO2 and O3 air pollution on photosynthetic responses in wheat. The plants were grown full-season in these chambers supplied with charcoal-filtered air (CF) as control, CF + 155μL CO2 L1 as high CO2, non-filtered air (NF) + 40nL O3 L1 as high O3 and NF + 155μL CO2 L1 + 40nL O3 L1 as combined high CO2 and high O3. Photosynthetic rates (Pn) were measured three times during vegetative and reproductive stages with portable gas exchange system (LI-COR 6200). In general, Pn rates were stimulated by high CO2 and reduced by high O3 but in some cases, combined high CO2 and high O3 increased the Pn rates. The data showed continuous increases in Pn rates during pre-flowering and early seed formation and drops during late seed formation stage. This study supports that the concentration of CO2 at 5 ± 500μL L1 treatment had a protective role against adverse impacts of O3 exposure at concentration 5 ± 60nL L1 treatments.]]>Adams, R.M., C. Rosenzweig, R.M. Peart, J.T. Ritchie and B.A. McCarl et al.,1990345219224Allen, L.H.,1990191534Amthor, J.S.,19971997pp: 35-77pp: 35-77Amundson, R.G., R.J. Kohut, A.W. Schoettle, R.M. Raba and P.B. Reih,1987777579Barnes, J.D. and A. Wellburn,19991999Barnes, J.D., T. Pfirrmann, K. Steiner, C. Lutz, U. Busch, H. Kuchenhoff and H.D. Payer,19952, Elevated O3 and potassium deficiency on Norway spruce [icea abies (L.) Karst]: Seasonal changes in photosynthesis and non-structural carbohydrate content.]]>1813451357Bowes, G.,19912: Photosynthetic responses mediated through rubisco.]]>14795806Bowes, G.,19932.]]>44309332Chernikova, T.,19981998Da Costa, J.M.N., N.J. Roseberg and S.B. Verma,19862 release by a soybean crop.]]>37219227Darral, N.M.,198912130Farage, P.K., S.P. Long, E.G. Lechner and N.R. Baker,199195529535Gomez, K.A. and A.A. Gomes,19842nd Edn.,Pages: 680Pages: 680Heagle, A.S., D.E. Body and W.W. Hech,197320562570Heck, W.W.,19901990pp: 235-315pp: 235-315Krupa, S.V. and R.N. Kickert, 19892 and ozone (O3) on vegetation.]]>61263393Kull, O., A. Sober, M.D. Coleman, R.E. Dickson, J.G. Isebrands, Z. Gagnon and D.G. Karnosky,19962.]]>26639648Lehnherr, B., F. Machler, A. Grandjean and J. Fuhrer,1988Triticum aestivum L. cv. Albis) at different levels of O3 in ambient air.]]>8811151119Lehnherr, B., A. Grandjean, F. Machler and J. Fuhrer,1987130189200Lippert, M., K. Steiner, T. Pfirrmann and H.D. Payer,19973 and CO2 on gas exchange characteristics of differently K supplied clonal Norway spruce trees during exposure and the following season.]]>11306315McKee, I.F., J.F. Bullimore and S.P. Long,19972 concentrations protect the yield of wheat from o3 damage?]]>207784Miller, J.E.,19871987pp: 55-100pp: 55-100Miller, J.E.,19881988pp: 285-314pp: 285-314Mulchi, C.L., L. Slaugter, M. Saleem, E.H. Lee, R. Pausch and R. Rowland,19922.]]>38107118Reich, P.B. and R.G. Amundson,1985230566570Reich, P.B., A.W. Schoettle, R.M. Raba and R.G. Amundson,1986153136Rudorff, B.F.T., C.L. Mulchi, E.H. Lee, R.A. Rowland and R. Pausch,1996Triticum aestivum) exposed to elevated O3 and CO2.]]>3612471251Runeckles, V.C.,19921992pp: 157-270pp: 157-270Sanders, G.E., J.J. Colls and G. Clark,1992Phaseolus vulgaris in response to long-term ozone exposure.]]>69123133SAS Institute,1990Version 6.04,Saxe, H.,19911991pp: 2-127pp: 2-127Stitt, M.,19912 levels and their potential significance for carbon flow in photosynthetic cells.]]>14741762Stockle, C.O., P.T. Dyke, J.R. Williams, C.A. Jones and N.J. Rosenberg,199238239256Woodword, F.I., G.B. Thompson and I.F. Mckee,19912 on individual plants, populations, communities and ecosystems.]]>672338