Healthy leaves of Spilanthes were collected from the campus of Indian Institute of Technology, Guwahati. Leaves were washed with 1% (v/v) savlon (Johnson and Johnson, India) for 20 min, fol-lowed by three rinses in sterile distilled water (SDW). Thereafter, the remaining steps were carried out inside the laminar-air-flow cabinet (Saveer Biotech, India). Leaves were surface sterilized with 0.1% mercuric chloride (HgCl2) for 10 min and rinsed thrice with SDW. Leaf-disc explants were prepared by punching the ster-ilized leaves with 5 mm sized cork-borer before being cultured with the abaxial side in contact with the media.