Abstract
The Melaleuca alternifolia is a Myrtaceae tree of great medicinal importance. Its essential oil is widely used both in human and in veterinary medicine, having great antiseptic power. It is a difficult plant in the process of rooting cuttings. This study aimed to evaluate the efficacy of different concentrations of NAA and IBA on the rooting of M. alternifolia. Melaleuca cuttings with 10 cm in length were submitted to treatments with two regulators, NAA and IBA, in the following concentrations: 0 (control), 1000, 2000 and 4000 mg L-1. Evaluation occurred at 97 days throughout the live and dead cuttings rooted, medium length, volume and mass of roots. The growth regulator NAA at a concentration of 4000 mg L-1 showed to be phytotoxic to the cuttings of melaleuca; the use of IBA in comparable with NAA at concentration of 4000 mg L-1 provided a higher percentage of rooting and root length increases.
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