Effect of Plant Growth Regulators on Minimizing Ozone Injury in Tobacco(Nicotiana tabacum L.)
1998
Park K.S. | Cho J.H. Coll. of Agr. Kyungpook N. Univ. Taegu 702-701 (Korea Republic)
This experiment was conducted to find out the effects of ABA and IAA on activities of antioxidant enzymes, antioxidant content, and growth of tobacco under exposure to ozone. The exposure to ozone in tobacco plant significantly decreased plant height, but it did not show any difference in vegetative characteristics except plant height of IAA milli 10M treated. Total chlorophyll content of NC 82 was dramatically decreased with increase in days after ozone treatment. However, reduction of chlorophyll was minimized when plant growth regulators were treated before ozone exposure. Three days treament of ozone in tobacco increased ascorbic acid of oxidised form, while slightly decreased in reduced ascorbic acid by IAA treatment. But seven days of ozone treatment showed increase in ascorbic acid and decrease in dehydroascorbic acid. Ozone treatment did not show any difference in glutatione content and glutathione reductase activity when plant growth regulators were treated. Activities of superoxide dismutase(SOD), ascorbate peroxidase(AP) and guaiacol peroxidase(GP) were increased by the exposure to ozone for three days. However, there were no difference in activities of SOD, AP and GP due to exposure to ozone for seven days. These reactions may be interpreted as protective responses to prevent or alleviate the damage of tobacco plant by ozone exposure.
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