An alternative propagation method ofAnanas through nodule culture.

A micropropagation scheme forAnanas comosus Merr. was developed using nodule culture. Nodules were induced from leaf-base or chopped shoot-base explants on modified half-strength MS medium supplemented with 2.69-5.37 μM NAA and 4.44 μM BA and could be maintained long-term as nodules. The nodules proliferated into more nodules when chopped into pieces of 1-3 mm and placed onto the same medium. They regenerated shoots when transferred to medium supplemented with 0.54-10.74 μM NAA and 0.44-8.88 μM BA. The regeneration capacity of nodules is higher than that of direct regeneration or callus. Maximum regeneration was obtained from culture medium containing 0.54 μM NAA and 0.44 μM BA, where shoots could be observed as early as within 2 weeks. Many shoots formed roots in the same medium in which they were regenerated after 10 subcultures, but the best rooting occurred in medium containing 0.54 μM NAA and 0.44 μM BA. Rooted plantlets ofA. comosus Merr. could be routinely produced at 6-week intervals.