ORIGEM DE BROTAÇÕES EPICÓRMICAS E APLICAÇÃO DE ÁCIDO INDOLILBUTÍRICO NO ENRAIZAMENTO DE ESTACAS DE Vochysia bifalcata Warm.

Abstract

ABSTRACTGuaricica (Vochysia bifalcata) is a native species of the coastal region of Paraná, Santa Catarina, SãoPaulo, Rio de Janeiro and Minas Gerais states, with great ecological importance due its ability to regenerate degraded areas.However, little information exists about its ability to sexual or asexual propagation. One ofthe causes of cuttings low rooting is the maturation of collected tissues. Thus, this study aimed to evaluatedifferent epicormic sprout sources (from stump and from bend of stem) and the application of indolebutyricacid (IBA) in rooting cuttings ofVochysia bifalcata. Two types of cuttings were used (of stump and of bendof stem) and were treated with two concentrations of IBA (0 and 1000 mg L-1), and later, the cuttings werekept in a greenhouse for 60 days. Anatomical analysis of the base on each type of cuttings demonstrated thatthe presence of fibers in the cortical region of the stem cuttings of stump did not constitute an anatomicalbarrier to issue adventitious roots, because they had higher rooting capacity (81%), a higher number ofroots per cuttings (8,0) and increased root length (2,0 cm) compared to those of bend of stem, that showedpoorer results as lower rooting percentage (31%), lower number of roots per cutting (3,3) and lower rootlength (0,7 cm). It is concluded that the use of basal shoots obtained by regrowth of stump provides betterrooting than the bend of stem, not requiring the application of IBA as rooting induction treatment for thistype of material.