Salix is an ornamental tree adapted to humid soils being considered an important species used in depleted areas. Its wood may be used in all kinds of industries. Although the production of seeds is large, the germination is reduced. The objective of this work was to establish salix in vitro through the induction and formation of friable callus of leaf explants to provide future regeneration of plants for mass propagation of the species. Leaf explants were inoculated in MS medium (MURASHIGE & SKOOG, 1962) supplemented with different concentrations of 2-4-diclorofenoxiacetic acid (0; 1.0; 2.0; 4.0; 6.0; 8.0 and 12.0mg L-1) and combinations of 1-naphthaleneacetic acid and 6-benzylaminopurine both with the concentrations of 0; 1.0; 2.0; 4.0; 6.0 e 8.0mg L-1. The results showed that explants inoculated in the absence of growth regulators had no formation of friable callus. Significant production of friable callus (90%) was obtained with 6.0mg L-1 of 2-4-diclorofenoxiacetic acid. Individual concentrations of 1-naphthaleneacetic acid or 6-benzylaminopurine induced callogenesis and rooting.
Salgueiro-do-rio; tissue culture; callogenesis; Salyx humboldtiana
