biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 54:614-620, 2010 | DOI: 10.1007/s10535-010-0111-2

Overexpression of tomato tAPX gene in tobacco improves tolerance to high or low temperature stress

W. -H. Sun1, M. Duan1, F. Li1, D. -F. Shu1, S. Yang1, Q. -W. Meng1,*
1 College of Life Science, State Key Laboratory of Crop Biology, Shandong Agricultural University, Tai'an, P.R. China

In order to investigate the function of chloroplast ascorbate peroxidase under temperature stress, the thylakoid-bound ascorbate peroxidase gene from tomato leaf (TtAPX) was introduced into tobacco. Transformants were selected for their ability to grow on medium containing kanamycin. RNA gel blot analysis confirmed that TtAPX in tomato was induced by chilling or heat stress. Over-expression of TtAPX in tobacco improved seed germination under temperature stress. Two transgenic tobacco lines showed higher ascorbate peroxidase activity, accumulated less hydrogen peroxide and malondialdehyde than wild type plants under stress condition. The photochemical efficiency of photosystem 2 in the transgenic lines was distinctly higher than that of wild type plants under chilling and heat stresses. Results indicated that the over-expression of TtAPX enhanced tolerance to temperature stress in transgenic tobacco plants.

Keywords: Lycopersicum esculentum; malondialdehyde; Nicotiana tabacum; photosystem 2; thylakoid-bound ascorbate peroxidase; transgenic tobacco
Subjects: Agrobacterium tumefaciens; ascorbate peroxidase; chlorophyll fluorescence; electrolyte leakage; hydrogen peroxide; Lycopersicon esculentum; malondialdehyde; photosynthetic rate; superoxide dismutase (SOD); temperature high; temperature low; tomato; transgenic plants

Received: March 17, 2009; Accepted: September 25, 2009; Published: December 1, 2010  Show citation

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Sun, W.-H., Duan, M., Li, F., Shu, D.-F., Yang, S., & Meng, Q.-W. (2010). Overexpression of tomato tAPX gene in tobacco improves tolerance to high or low temperature stress. Biologia plantarum54(4), 614-620. doi: 10.1007/s10535-010-0111-2
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