Photosynthetica 2009, 47(1):19-25 | DOI: 10.1007/s11099-009-0005-8

Changes of net photosynthesis, antioxidant enzyme activities, and antioxidant contents of Liriodendron tulipifera under elevated ozone

S. Z. Ryang1, S. Y. Woo1,*, S. Y. Kwon2, S. H. Kim1, S. H. Lee1, K. N. Kim1, D. K. Lee3
1 Department of Environmental Horticulture, University of Seoul, Seoul, Republic of Korea
2 Korea Research Institute of Bioscience and Biotechnology, Daejeon, Republic of Korea
3 Department of Forest Sciences, College of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea

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.

Additional key words: ascorbate; catalase; chlorophyll content and fluorescence; glutathione reductase; irradiance; peroxidase; O3; superoxide dismutase; water use efficiency

Received: June 4, 2008; Accepted: October 6, 2008; Published: March 1, 2009  Show citation

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Ryang, S.Z., Woo, S.Y., Kwon, S.Y., Kim, S.H., Lee, S.H., Kim, K.N., & Lee, D.K. (2009). Changes of net photosynthesis, antioxidant enzyme activities, and antioxidant contents of Liriodendron tulipifera under elevated ozone. Photosynthetica, 47(1), 19-25. doi: 10.1007/s11099-009-0005-8
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