Effects of ozone on wild type and transgenic tobacco |
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| Authors: | J Guo X F Li D M Qi S Y Chen Z Q Li I Nijs Y G Li G S Liu |
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| Institution: | (1) Laboratory of Plant Biotechnology, Faculty of Agriculture, Tottori University, Koyama, Tottori 680-8553, Japan;(2) Japan International Research Center for Agricultural Sciences, Ohwashi, Tsukuba, Ibaraki, 305-8686, Japan;(3) Department of Agronomy, Faculty of Agriculture, University of Khartoum, Shambat, 3114, Sudan;(4) Laboratory of Veterinary Infectious Disease, Faculty of Agriculture, Tottori University, Koyama, Tottori 680-8553, Japan;(5) Division of Laboratory Animal Science, Research Center for Bioscience and Technology, Tottori University, Yonago, Tottori 683-8503, Japan;(6) Agricultural Research and Technology Corporation, Wad Medani, 126, Sudan; |
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| Abstract: | Tocopherol cyclase (TC, encoded by gene VTE1) catalyzes the penultimate step of tocopherol synthesis. In this study we used wild type and transgenic tobacco plants overexpressing
VTE1 from Arabidopsis to examine the role of tocopherol in ozone sensitivity. Wild type plants responded to an 4-h exposure to 300 nmol mol−1 ozone by severe leaf necrosis while the transgenic lines exhibited limited injury. Compared with the wild type, VTE1-overexpressing plants had lower increase in hydrogen peroxide, malondialdehyde contents and ion leakage, and lower decrease
of net photosynthetic rate 48 h following the ozone exposure. Transgenic plants also better maintained the structural integrity
of the photosynthetic apparatus. |
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