diameter were formed in 3–4 weeks, and they were transferred
to a two layer culture system with CM-I liquid at the
top of the solidified CM-II medium for 2 weeks at 25 C
under a 16-h photoperiod followed by culturing on CM-II
medium for proliferation. The proliferated calli which had
a size larger than 5 mm in diameter were transferred to
the differentiation medium (DM) (supplemented with
0.1–0.3 mg l-1 IAA and 2.0 mg l-1 ZT, filter sterilizing)
for plant regeneration. The regenerated shoots were excised
and cultured on MS or 1/2 MS salts (when rooting was
difficult) medium for root development.