ABSTRACT
Sapium glandulatum (Vell.) Pax (Euphorbiaceae) is a native and rustic tree found in different Brazilian plant formations, and is much indicated for recovery of degraded ecosystems. However, the sexual propagation is very difficult because almost every flower is male, the seed production is poor and the percentage of seed germination is low. The mini-cuttings technique is an alternative to other methods of propagation that allow the rooting with young material. Thus, the present work aimed to test the sprouts production and rooting by mini-cuttings of Sapium glandulatum (Vell.) Pax originating from young seedlings, collected in four seasons (autumn, winter, spring 2006 and summer 2007), in Colombo - PR, Brazil. The mini-cuttings were trimmed to 3 cm in length, with two half leafs in apical region. Indolebutyric acid (IBA) and naphtalene acetic acid (NAA) were applied in the base of the mini-cuttings at 0, 2000, 4000, 6000 and 8000 mgL-1 for 10 seconds. The percentage of rooted mini-cuttings, amount and root length, percentage of mini-cuttings with callus, survival and mortality rate were evaluated in a experimental random delineation, with factorial range of the treatments: 2x5x4 (kinds of plant growth regulator x concentration of plant growth regulator x seasons). The mini-cuttings production/mini-tumps range between 1.4 until 2.2 in 205 cm³ recipient. The best season for rooting was winter, with 80.56% of rooting when the vegetal regulator was not used. It is concluded from this study that the vegetative propagation of Sapium glandulatum (Vell.) Pax by mini-cuttings collected from young seedlings can be used for rooting.
Keywords:
leiteiro; young seedlings; plant growth regulator; mini-tumps