Seleção de genótipos de Dendrobium phalaenopsis (Orchidaceae) nas fases de propagação in vitro e aclimatização Selection of Dendrobium phalaenopsis (Orchidaceae) genotypes in the in vitro propagation and acclimatization phases

The hybridization of orchids have been done to propitiate a production of cultivars with commercial interesting that show high vigor, great number of flowers and variability of colors. This research had the objective to select favorable genotypes of Dendrobium phalaenopsis for in vitro propagation and acclimatization, resulted from crossing and self- fertilizations of selected plants matrix. For the realization of crossing and self-fertilizations 56 plants of D. phalaenopsis were utilized, totalizing 109 combinations. From the 109 crossing and self-pollinations, only 13 crossing and 3 self-pollinations showed enough number of seedlings for an evaluation. After five months, 15 seedlings from each crossing and selfpollinationss were evaluated by the following characteristics: length of the aerial part, number of roots, weight of the total fresh mass, length of the biggest root and number of buds. The others seedlings were planted in trays of styrofoam and after four months the rate of survival were evaluated. The most favorable genotype for the in vitro propagation and acclimatization was the crossing DF18 x DF13.