The objective of the present work was to evaluate the efficiency of the hydroquinone, proline and tryptophane cofactors, associated with IBA growth regulator on vegetative propagation by the rooting of mini-cuttings of four clones of Eucalyptus grandis x E. urophylla. The mini-cuttings were collected in a mini-clonal hedge grown in a hydroponic system in small gutters. It was used a complete random experimental design, with four replicates and plots of 16 plants per replicate. Evaluations of rooted mini-cuttings were carried out in a greenhouse, in a shade house and in the open sun. It was concluded that the tryptophane (0.80 mg L-1) and hydroquinone (0.20 to 0.40 mg L-1) used in association to IBA, improved the rooting in three out of four evaluated clones whereas proline (0.20 to 0.40 mg L-1) associated to IBA improved significantly rooting of the four studied clones, proving to be among the most efficient cofactors.
Mini-cutting; Stem-cutting rooting; Vegetative propagation; Clonal forestry
