A quick bud breaking response of a surface model for rapid clonal propagation in Centella asiatica (L.)

Present investigation was planned to evaluate time period of bud breaking in Centella asiatica with different concentration of plant growth regulators, a medicinal herb distributed throughout the worldwide. For the study, concentrations were designed for response surface model describing bud breaking growth in optimum conditions. A combination of BAP (2 mg/L) + gibberellic acid (GA3, 0.5 mg/L) was achieved at a best initial bud breaking at 8thhour. Longest time period taken for bud breaking was shown in combination of BAP (0.5 mg/L) + naphthalene acetic acid (NAA, 0.5 g / L) and BAP (0.1 mg/L) + adenine sulphate (0.5 mg/L) which was recorded at 84th hour. Half strength MS media was supplemented with IBA alone (2 mg/L) and in combination with IAA (0.5 mg/L) to attain an early in vitro rooting. Their interactions observed were statistically significant (P < 0.05).   Key words: Centella asiatica, bud, plant growth regulator, medicinal plant.