Does CO2 ameliorate phytotoxic effects of O3?, Prof. Ibrahim Hassan
Prof. Ibrahim A. Hassan
Department of Botany, Faculty of Science
Alexandria University, El Shatby, Alexandria 21526
Department of Biology, Faculty of Science and Arts
King Khaled University, P.O. Box 344, Bisha
Kingdom of Saudi Arabia
Abstract: Potato (Solanum tuberosum L. cv. Kara) was grown in Open-Top Chambers (OTCs) in Northern Egypt at ambient (ca 350 ppm) or doubled CO2 (ca 690 ppm) either in charcoal-filtered air (15 nl l−1) or in non-filtered ambient air (78 nll−1 O3) to investigate the changes in physiology and yield under long-term elevated CO2and/or O3 throughout 100 days. Ambient O3 level reduced net photosynthetic rates, number and weight of tubers by 18%, 41% and 21%, respectively, whereas elevated CO2 caused the opposite effect where it increased the same parameters by44%, 37% and 20%, respectively. Significant O3 x CO2 interactions were detected. However, O3 caused an increase in GR and POD by 18% and 35%, respectively, while CO2 caused an increase in POD only by 46%, and there was no effect of O3 and/or CO2 on other enzymes. The results of this study are discussed in relationto predicted atmospheric changes.
Keywords: Open-Top Chambers; OTCs; Potato (Solanum tuberosum); O3; CO2; Photosynthesis; Stomatal Conductance; Antioxidant enzymes; Growth and yield; Superoxide Dismutase; SOD; Glutathione Reductase; GR; Ascorbate Peroxidase; APX; Guaiacol peroxidase; POD.
Citation: Hassan, I.A. (2010), "Does CO2 ameliorate phytotoxic effects of O3? A study case on their interactive effects on physiology, and yield of potato (Solanum tuberosumL. Cv. Kara) plants", World Journal of Science, Technology and Sustainable Development, Vol. 7 No. 2, pp. 163-174. https://doi.org/10.1108/20425945201000011