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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Abbreviations
- ci :
-
intercellular CO2 concentration
- E:
-
transpiration rate
- gs :
-
stomatal conductance to water vapor
- MDA:
-
malondialdehyde
- OTC:
-
open-top chamber
- PAR:
-
photosynthetically active radiation
- PNmax :
-
light-saturated net photosynthetic rate
- PPFD:
-
photosynthetic photon flux density
- ROS:
-
reactive oxygen species
- TC:
-
tocopherol cyclase
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Acknowledgements: We are grateful to our co-workers Zhiping Jin and Zhigao Du for assistance with the experiments. This research was funded by the National Basic Research Program of China (973, 2007CB108905), the National Science Foundation of China (NSFC: 30600370), and the Key Project of the Chinese Academy of Sciences (KSCX2-YW-N-50).
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Guo, J., Li, X.F., Qi, D.M. et al. Effects of ozone on wild type and transgenic tobacco. Biol Plant 53, 670–676 (2009). https://doi.org/10.1007/s10535-009-0121-0
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DOI: https://doi.org/10.1007/s10535-009-0121-0