This research aimed to studied the influence of different sucrose concentrations in the in vitro growth of Caularthron bicornutum (Hook.) Raf.. The experiment was conducted at Department of Technology of Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Paulista - Unesp/FCAV, Jaboticabal, São Paulo state, in the period of January to October of 2009. Were studied 6 treatments (5 sucrose concentrations: 10; 20; 30; 40 and 50g L-1 and sucrose absence in the middle of culture) and 5 replications with 12 seedlings per replication had been used in a completely randomized design. The seeds were placed in culture medium MS, and after 90 and 150 days they were selected and transferred for flasks containing culture medium ½MS, with the different sucrose concentrations. After 210 days evaluation was accomplished. It was verified that the sucrose in the concentrations from 13 to 29g L-1 provided the largest averages for the number of roots, length of roots and length of the aerial part; however it didn't influence in the rooting percentage of the plântlests of Caularthron bicornutum.
micropropagation; orchid; ornamental plant
