In the hydroponic culture system, after 7 d of
inoculation, the ability of GFP-tagged strain W19 to
colonize banana roots was studied using SEM to examine
the presence of the bacterial cells in the root system.
Pure cells of the wild-type strain detected by SEM
are shown in Fig. 3a. The result showed that the morphology
of the GFP-tagged W19 cells distinctly colonized
on the root surface (Fig. 3b), which was similar
to the pure cells of the wild-type strain. Occasionally,
after enhancing the magnification, adnexed biological
membrane was observed on the root surface (indicated
by arrows) (Fig. 3c).
Fig.