As far as the combination of BA and high concentration of sucrose is concerned it
was observed that low concentration i.e. 1.0 mg/l to 3.0 mg/l BA failed to show
significant effect on microtuberization response. Best response for cv. Diamant was
obtained in MB8 medium containing 5.0 mg/l BA with 8% sucrose (Figs. 1 & 2). At this
concentration microtuber formation started after 10 days of inoculation for both single
node and multinode explants. The mean number 2.8 & 3.2 microtuber, per single and
multinode explant, respectively, was optimized. In case of cv. Diamant the maximum
mean fresh weight 0.37 g of microtuber per single node explant (Fig. 5) was observed in
medium MB11. For cv. Red Norland the optimum results in terms of minimum time of
induction (29 & 27 days), mean number (1.2 & 2.1) and fresh weight (0.03 & 0.05 g) of
microtuber per single and multinode explant, respectively was found in the medium
MB20 containing 8% of sucrose .