Our results showed that medium type had a
significant effect on root length. The longest root
(1.49 cm) grew from a shoot cultured on MS ½ N
medium containing 3 mg/L IBA + 4 mg/L NAA
(Table 3). According to Karjadi and Buchori (2007)
root formation requires a high ratio of auxin to
cytokinin. To maximize root length, auxin must be
present as an important initiator of root growth, while
cytokinin hormone should be reduced or eliminated.
Sirchi et al. (2008a) achieved the best result for
mangosteen root formation (90.4%) with explants
cultured on one-quarter strength of MS salt medium
supplemented with 0.1 mg/L NAA. Nisa and Rodinah
(2005) found an interactive effect with NAA and
Kinetin on Musa paradisiaca L. rooting.