The Effect of Auxins (IBA, NAA) on Vegetative Propagation of Medicinal Plant Bobgunnia Madagascariensis (Desv.) J.H. Kirkbr & Wiersema

Bobgunnia madagascariensis , an important medicinal plant, is difficult to propagate through seed germination. The study was conducted to develop a procedure for its regeneration through vegetative propagation by stem cuttings. The effects of auxin type [IBA (indole-3-butyric acid) or NAA (α-naphthalene acetic acid)] and their different levels of concentration 0, 100, 300 and 500 ppm were investigated to determine their ability to promote adventitious rooting in B. madagascariensis stem cuttings. The effect of auxin type was significant (p < 0.01) only for percentage rooting and root number per cuttings while the effect of auxin concentration was evidently significant (p< 0.01) in all rooting parameters evaluated in terms of percentage rooted cuttings, root number per cuttings, root length and root dry weight. The effect of auxin types and concentration showed that the highest and significant (p<0.05) rooting percentage was observed under IBA treatment at 300 ppm (39.53%). IBA revealed significant higher performance in rooting ability of B. madagascariensis than NAA in all rooting parameters evaluated and the effect being more pronounced at 300 ppm. Vegetative propagation will ensure sustainable exploitation this economically important medicinal plant. Keywords : Auxin, Bobgunnia madagascariensis, IBA, NAA, Stem cuttings.