Changes of net photosynthesis,antioxidant enzyme activities,and antioxidant contents of <Emphasis Type="Italic">Liriodendron tulipifera</Emphasis> under elevated ozone |
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| Authors: | S Z Ryang S Y Woo S Y Kwon S H Kim S H Lee K N Kim D K Lee |
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| Institution: | (1) Department of Environmental Horticulture, University of Seoul, Seoul, 130-743, Republic of Korea;(2) Korea Research Institute of Bioscience and Biotechnology, Daejeon, 305-806, Republic of Korea;(3) Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University, Seoul, 151-921, Republic of Korea |
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| Abstract: | Liriodendron tulipifera was exposed to gradually elevated ozone concentrations of 100–300 μg kg−1 in the naturally irradiated environment chamber. During 15 d of exposure to O3, net photosynthetic rate (P
N) decreased and there was large difference between the control (C) and treatment with ozone (OT), while there was no significant
difference in water use efficiency. Total chlorophyll content as well as the value of fluorescence parameter Fv/Fm decreased, while antioxidant enzyme activities related to ascorbate-glutathione cycle increased after 15 d of OT. Unchanged
contents of ascorbate and glutathione indirectly suggest that the species hastened the antioxidant’s oxidization/reduction
cycle using enzymes instead of expanding their pool against oxidative stress. |
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| Keywords: | Additional" target="_blank">Additional ascorbate catalase chlorophyll content and fluorescence glutathione reductase irradiance peroxidase O3 superoxide dismutase water use efficiency |
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