This study aimed to evaluate the effect of indolyl-3-butyric acid (IBA) and carbohydrates in promoting the rooting of blackberry shoot cuttings. This work was conducted from June to August 2010, at UNESP, Botucatu, Sao Paulo state, Brazil, under the randomized block design, with six concentrations of IBA and six replications of 12 shoot cuttings per plot. The treatments consisted of six concentrations of IBA, as a solution: T1= 0 mg L-1, T2= 250 mg L-1, T3= 500 mg L-1, T4=1000 mg L-1, T5 = 2000 mg L-1 and T6= 4000 mg L-1 applied on the basis of shoot cuttings for ten seconds. After 60 days,: the percentage of rooting and the soluble carbohydrates levels were evaluated. The highest concentrations of IBA inhibited root development and characteristics of the shoots cuttings. The higher sugar levels in shoot than in the roots may indicate that the shoot functioned as a source of assimilates, among them,soluble sugars, to promote the rooting of shoots.
Blackberry; plant propagation; auxin; vegetative propagation
