The medium was gelled with 0.8% agar and supple-mented with 3% sucrose, unless otherwise mentioned.
For callus proliferation, MS medium supplemented
with BA (1.0 mg/l) and 2,4-D (1.0 mg/l) was used and
sub-culturing was done every 4 weeks. Two types of
calluses were obtained: (1) fast-growing and friable, and
(2) slow-growing, compact and nodular