PROPAGATION OF Tabebuia Donnell-Smithii Rose (White Guayacán)

Abstract

Abstract

The wide distribution and natural abundance of Tabebuia donnell-smithii (white guayacán) has been reduced by overcutting of the trees, which has caused the disappearance of valuable genotypes as well as natural population decline, also, there is lack of alternatives in production of large-scale plants. Hence, it is necessary to orientate the research toward to establish a technique for the vegetative propagation of white guayacán using phytoregulators. The methodology was based on the use of rooting hormones, naphthaleneacetic acid (NAA) and indole butyric acid (IBA) at concentrations of 0, 1,500 and 2,000 mg kg-1 in peat and sand substrates. Apical buds were placed in a moist chamber under greenhouse conditions. We used a completely randomized design (DCA) in a factorial 2 x 3 substrates ANA hormone dose x 3 doses of hormone AIB. With four replications and four observation units. At 45 days were evaluated: survival and rooting percentage, number of roots, greater root length, number of shoots, shoot length and vgor. The results did not show significant differences between treatments for all variables, however for the simple effect and interactions were observed differences for the variables evaluated, being the best peat substrate and optimal concentrations of auxins from 0-1,500 mg kg-1. In conclusion, the results showed that white guayacán is a kind of easy rooting inasmuch as with and without the application of hormones in the peat and sand substrate, it was achieved the obtaining of clones, reducing the time to obtain new plants.