“…In our previous study, Z78 has been proven for its ability to promote proliferation of callus and embyrogenic callus of oil palm (Lim et al, 2016a, b). As a consequence of the interactions, diazotroph could probably initiate cell proliferation and differentiation of oil palm calli and embryogenic calli in response to nitrogen supplied via nitrogen (N 2 ) fixation process and hormonal stimuli such as IAA (Lim et al, 2016b). Due to the potential application of diazotrophs with in vitro plant, various morphological analyses have been done to understand the interactions of bacteria and in vitro plant culture materials such as carrot, strawberry, rice, cormlet and oil palm (Varga et al, 1994;Preininger et al, 1997;Oliveira et al, 2002;Parray et al, 2015;Lim et al, 2016a, b).…”