Furthermore, Yang et al. (2009) showed that, in transgenic
plants overexpressing AtNHX1, there is not a crucial role in salt
tolerance in Arabidopsis, again contrary to other previous reports in
which the salt tolerance of transgenic Arabidopsis plants overexpressing
AtNHX1 was greatly improved. The authors stated that
they could not explain the reason for differences between the two
studies and speculated it may be due to different assay conditions
or other unknown reasons [