Clonagem da Tabeluia aurea e Cnidoscolus quercifolius pelo processo de alporquia.

Abstract

Cloning of Tabeluia aurea and Cnidoscolus quercifolius by air layering process. For forest species such as Tabebuia aurea and Cnidoscolus quercifolius, the cloning allows a better genetic gain than in reproduction by seed in less time. Phytoregulators based on auxin such as Indole butyric acid (AIB), and also the aqueous extract from the tubers of Cyperus rotundus L. have been used for cloning plants as roots promoters and in the quality of the roots. The objectives of this study was to evaluate the efficiency of cloning technique by layering in two species of Caatinga, Tabebuia aurea and Cnidoscolus quercifolius, getting to know the best time, the time required for rooting and efficiency of Tiririca extract, and AIB. For Tabebuia aurea the treatments were: Absolute control (without AIB) and application of AIB at concentrations of 1.5 g L-1, 3.0 g L-1, 4.5 g L-1 and 6.0 g L-1 AIB. For Cnidoscollus quercifollius were evaluated aqueous extracts of Cyperus rotundus L. tubers with concentrations of 0.0% (Absolute control), 10%, 20%, 30% and 40%, AIB was also used at a concentration of 6.0 g / L (Additional control). It was found that the best time for cloning Cnidoscolus quercifolius, and Tabebuia aurea by layering technique is in winter. In general, the use of natural and synthetic auxin positively influenced all variables, overcoming the witnesses. To Cnidoscollus quercifollius, AIB was superior to other treatments for the variables of layering response to treatments applied (notes) and number of roots. The greatest number of layer rooted in less time was observed with the use of AIB to Cnidoscollus quercifollius, and 3.0 g L-1 for Tabebuia aurea.