cucumber and pumpkin grafted onto cucumber had different scion
salt tolerances. Self-grafted cucumber and pumpkin grafted onto
cucumber had similar growth reductions in the root. In addition,
self-grafted pumpkin and cucumber grafted onto pumpkin had
similar growth increments in the root under salt stress, suggesting
that the salt tolerance of the rootstock of the grafted plant is
independent of the scion (Table 1). In this study, plant biomass
between ungrafted cucumber and self-grafted cucumber was different
under 1 mM NaCl (Table 1), the reason could be attributed to
that the self-grafted plants experienced a grafting process, which
induced a delayed growth. All these results suggest that the use of
salt-tolerant rootstock is the primary factor in increasing the salt
tolerance of a salt-sensitive scion. The present result may explain
the dependency of arboreal crops on the rootstock in increasing the
salt tolerance of the grafted plant in previous studies (Mickelbart