Abstract: Effects of 6-BA, NAA and IBA alone or combination at various concentrations on the root in
duction of Michelia chapensis Dandy during tissue culture were investigated. The results showed that low con
centrations of 6-BA, NAA and IBA were suitable for the root induction and growth of Michelia chapensis Dan
dy. The root formation rate wasmore than 50% , while the root number of each p lantwasmore than 1.5 with
grown p lantletswhen the exp lantswere transferred to the 1/2MS medium containing 0.40 mg·L^-1 6-BA and
0.60 mg·L^-1 IBA and 0.80 mg·L^-1 NAA. Meanwhile, itwas observed that the root developed well.

Key words: Michelia chapensis Dandy, Root, Inducement, Plant growth regulator