Responses of Transgenic Tobacco Plants Overexpressing Superoxide Dismutase and Ascorbate Peroxidase in Chloroplasts to Water Stress

Superoxide Dismutase와 Ascorbate Peroxidase를 엽록체에 과발현하는 형질전환 담배의 수분스트레스에 대한 반응

  • 최선미 (청주대학교 생물학과) ;
  • 권석윤 (생명공학연구소 식물세포공학연구실) ;
  • 곽상수 (청주대학교 생물학과) ;
  • 박용목 (청주대학교 생물학과)
  • Published : 2001.02.01


To assess resistance of transgenic tobacco plants which overexpress superoxide dismutase (SOD) and ascorbate peroxidase (APX) in chloroplasts to water stress, changes in leaf water potential, turgor potential, stomatal conductance and transpiration rate were measured. Leaf water potential in all plants remained high up to day 4 after withholding water but thereafter decreased markedly. In spite of a remarkable decrease in leaf water potential, some of transgenic plants maintained higher turgor potential compared with control plant on day 12. In particular, the transgenic plant expressing MnSOD showed an outstanding maintenance in turgor pressure by osmotic adjustment throughout the experiment, resulting in high stomatal conductance and transpiration rate. However, among transgenic plants, osmotic potential was reduced more effectively in multiple transformants such as the double transformant expressing both MnSOD and APX, and the triple transformant expressing CuznSOD, MnSOD and APX than single transformants. Consequently, further research is needed to get general agreement on the tolerance of transgenic plants to water stress at different growth stages for each transgenic plant.


antioxidants;environmental stress;osmotic adjustment;tolerance;transgenic plant;turgor pressure;water potential;water stress


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