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
| Pages | 163-174 |
| Date | 01 May 2010 |
| DOI | https://doi.org/10.1108/20425945201000011 |
| Published date | 01 May 2010 |
| Author | Ibrahim A. Hassan |
| Subject Matter | Public policy & environmental management |
Copyright © 2010 WASD
World Journal of Science, Technology and Sustainable Development, Vol. 7, No. 2, 2010
163
Does Co2 ameliorate
phytotoxiC effeCts of o3?
a stuDy Case on their
interaCtive effeCts on
physiology, anD yielD of
potato (
solanum tuberosum
l. Cv. Kara) plants
Ibrahim A. Hassan*
Alexandria University, Egypt
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 CO2
and/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 by
44%, 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 relation
to 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.
introDuCtion
Ozone (O3) is the most phytotoxic pollut-
ant in the USA, Europe and other indus-
trialised areas of the world imposing the
great threat on Vegetation (Gardner et al.,
2005; Hassan, 2006; Hayes et al., 2009;
Keutgen, 2005; Oksanen et al., 2005;
Ranford and Reiling, 2007). Its ambient
concentrations in the troposphere are
increasing due to global industrialisation
and excessive anthropogenic emission of its
precursors. Moreover, CO2 concentrations
* Department of Botany, Faculty of Science, Alexandria University, El Shatby, Alexandria 21526, Egypt, Department of
Biology, Faculty of Science and Arts, Bisha, King Khaled University, P.O. Box 344, Bisha, Kingdom of Saudi Arabi a;
e-mail: i_hassan82@hotmail.com
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