ACTA AGRICULTURAE BOREALI-SINICA ›› 2014, Vol. 29 ›› Issue (6): 155-162. doi: 10.7668/hbnxb.2014.06.027

Special Issue: Tobacco Saline-alkali stress Biotechnology

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Analysis of Physiological Mechanism of Stress Tolerance in SsDREB Transgenic Tobacco

SUN Xiao-bo, JIA Xin-ping, LIU Xiao-xue, MA Hong-xiang, YE Xiao-qing   

  1. Key Laboratory of Jiangsu Province for Agrobiology, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
  • Received:2014-09-07 Published:2014-12-28

Abstract: To study the function of SsDREB gene in transgenic tobacco and analyze physiological mechanisms of transgenic tobacco.In this study,the SsDREB gene driven by constitutive promoter CaMV 35S was transformed into tobacco NC89 with Agrobaeterium EHA105 containing the plant expression vectors pCAMBIA2301-SsDREB.The positive tobacco plants were selected by Kan resistance,PCR and RT-PCR.Drought and high salt tolerance of transgenic tobacco seedlings was determined,and net photosynthetic rate(Pn),stomatal conductance(Gs),the energy conversion efficiency(Fv/Fm),the actual photochemical efficiency(φPSⅡ),and the content of proline and soluble sugar of leaves of transgenic tobacco treated with different concentrations of NaCl and PEG6000 respectively were measured.The results showed that 12 lines of positive transgenic seedlings were finally identified by Kan resistance,PCR and RT-PCR.The results of stress tolerance experiments showed that the overexpression of SsDREB could improve resistance of transgenetic tobacco to abiotic stress.Under NaCl and PEG6000 treatments with different concentrations,the Pn and Gs in control and transgenic plants decreased gradually with the increase of the treatment concentration,however,at the same treatment concentration,the Pn and Gs were higher in transgenic plants than that in control plants.With the increase of the treatment concentration of NaCl,Fv/Fm and φPSⅡ in the control and the transgenic plants declined gradually,but those of the transgenic plants decreased more slowly than those of control plants.Under different concentration of PEG treatment,Fv/Fm of control and transgenic plants gradually decreased,with the increase of the PEG concentration but the decrease of transgenic plant Fv/Fm was slower when compared with control plants;However,the φPSⅡdid not show obvious differences in changes between the transgenic and control plants.Proline and soluble sugar contents of the transgenic and control plants increased with the increase of the treatment concentration of NaCl and PEG,but proline and soluble sugar contents in the transgenic plants were higher than those in control plants.

Key words: Tobacco, SsDREB gene, Transgene, Stress tolerance, Physiological index

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Cite this article

SUN Xiao-bo, JIA Xin-ping, LIU Xiao-xue, MA Hong-xiang, YE Xiao-qing. Analysis of Physiological Mechanism of Stress Tolerance in SsDREB Transgenic Tobacco[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2014, 29(6): 155-162. doi: 10.7668/hbnxb.2014.06.027.

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