The embryos turned green and developed into protocorms for about 2 weeks of culture (Fig. 1C). TDZ at 0.1, 1 and 3 mg dm-3 induced 62.5, 71.9 and 93.8 % of leaf explants to formed mean numbers of 6.6, 7.5 and 19.4 embryos per explant,
respectively (Table 1). However, NAA retarded direct embryo formation from leaf cultures (Table 1). In Oncidium (Orchidaceae), TDZ was also effective in inducing direct somatic embryogenesis from leaf explants