Micropropagation of Kaempferia angustifolia Roscoe - An Aromatic, Essential Oil Yielding, Underutilized Medicinal Plant of Zingiberaceae Family
2018
Haque, Sk Moquammel | Ghosh, Biswajit
Kaempferia angustifolia is an aromatic, essential oil-yielding plant of the Zingiberaceae family with an ethno-medicinal repute. We standardized an effective system for micropropagation of K. angustifolia, and this is probably the very first report of in vitro culture of this species. Axillary buds were cultured on a Murashige and Skoog (MS) medium supplemented with various concentrations and combinations of plant growth regulators (PGRs) and spermidine. Highest multiplication occurred when the MS medium was supplemented with a combination of 2.0 mg L⁻¹ 6-benzylaminopurine (BAP), 2.0 mg L⁻¹ kinetin (KIN) and 1.0 mg L⁻¹ α-naphthalene acetic acid (NAA). Addition of spermidine (2.0 mM) along with optimum PGRs had further improved the multiplication rate with a maximum of 6.6 ± 0.36 shoots per explant within 60 days of implantation. The number of multiplied shoots per explant increased with each subsequent regeneration cycle; and the shoots per explant increased from 6.6 ± 0.36 on the 1ˢᵗ regeneration cycle to 10.3 ± 0.42 on the 2ⁿᵈ regeneration cycle and further increased to 13.7 ± 0.37 on the 3ʳᵈ regeneration cycle on the same medium composition. The best result for in vitro root induction of multiplied shoot was achieved on a half-strength MS medium fortified with 2.0 mg L⁻¹ IBA, with a maximum of 18.5 ± 0.28 roots per shoot. Regenerated plantlets were acclimatized with 88.9 % survival rate. After 9 months of field-transfer, all these plants were harvested and rhizomes were collected. However, the present protocol can definitely be applied for large-scale propagation and commercial cultivation of K. angustifolia.
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