| dc.description.abstract | Osmotic stresses including drought and soil salinity are the environmental
stressors that negatively affects plant growth and development. One of the
reasons is due to the accumulation of reactive oxygen species (ROS) in plants
under these adverse conditions, which leads to oxidative damages of plant cell
structure and activities. In response, plants have to use enzymatic and nonenzymatic strategies to scavenge the excessive ROS. Scientific studies have
highlighted the plant defense-mediated roles of NAC transcription factors (NAM,
ATAF1/2, and CUC2) in coping with osmotic stress factors. Recently, soybean
GmNAC085 has been found to be one of the most highly induced genes by
dehydration and drought. In addition, the in plant a characterization of
GmNAC085 using Arabidopsis system has demonstrated its positive functions in
enhancement of the drought tolerance of transgenic plants, at least by
facilitating the activities of antioxidant enzymes. Therefore, in this study,
antioxidant enzymatic activities of transgenic plants harboring GmNAC085 was
analyzed under salt stress, to find out if GmNAC085 also play a role on this. The
obtained results revealed that in comparison with the wild-type plants, the
transgenic plants had lower levels of hydrogen peroxide, in couple with higher
activity levels of catalase and peroxidase, the enzymes that are responsible for
hydrogen peroxide detoxification. In addition, pronounced activities of superoxide
dismutase enzymes which are in charge of scavenging another type of ROS,
superoxide radicals, were also observed in the salt-treated transgenic plants.
These findings indicate GmNAC085 has regulatory function in enhancing
antioxidant defense in plants against oxidative damage under salinity stress
conditions. | en_US |
