PGPR may help plants tolerate drought stress via the enhancement
and alteration of root parameters. More studies are needed to
investigate the correlation between bacterial-mediated improved
root architecture and drought tolerance. Moreover, functional
structural modelling studies of root systems in interaction with
their soil environment could be very pertinent (Doussan et al.,
2006; Dunbabin et al., 2013). Furthermore, more studies will be
needed to identify the ideal root traits that help plants the most
under drought stress. Identified specific traits could be incorporated
in breeding programs that aim to breed plants with root traits
to enhance productivity under drought stress.