An efficient, simple micropropagation method was developed for Alocasia amazonica using corms in semisolid and liquid cultures. Explants were cultured onto Murashige and Skoog (MS) medium (Murashige and Skoog, Physiol. Plant. 15:473–497, 1962) supplemented with different cytokinins (Benzyladenine [BA, 2.22–13.32 μM], kinetin [2.32–13.95 μM], Thidiazuron [TDZ, 0.45–4.54 μM]) and cytokinin in combination with auxins [naphthalene acetic acid (NAA, 0.54–5.37 μM)/indole acetic acid (IAA, 0.57–5.71 μM)/indole butyric acid (IBA, 0.49–4.9 μM)]. All supplementary-induced shoot proliferation and the optimal results was on the medium supplemented with 2.27 μM TDZ, which induced 5.1 shoots per explant. Among the different concentrations of sucrose (0–120 g l−1) tested for shoot proliferation, 30 g l−1 was found suitable for corm cultures of Alocasia amazonica. The optimal shoot proliferation and biomass values were with the plantlets grown at 30 μmol m−2 s−1 photosynthetic photon flux (PPF) and 25°C. Liquid cultures found suitable for shoot proliferation and biomass accumulation was compared to semisolid cultures. Comparative studies of bioreactor systems [continuous immersion (with or without net) and temporary immersion in liquid media using ebb and flood] revealed that shoot multiplication and growth were greatest with the raft bioreactor system. Plantlets (cormlets) from the bioreactor were hydroponically cultured for 30 days, and 100% of plants were acclimatized successfully. The simple efficient method of production of plantlets (cormlets) is useful for large-scale multiplication of this important ornamental plant.
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Vol. 44 • No. 1