Propagação vegetativa de porta-enxertos de pereira por estacas semi-lenhosas

Vegetative propagation of pear rootstocks using semi hardwood cuttings The objective of this work was to evaluate the technical viability of the vegetative propagation of the pear rootstocks ‘Taiwan Nashi-C’, ‘Taiwan Mamenashi’ (Pyrus calleryana Dcne.) and ‘Seleção IAC-1’ (Pyrus spp.) using semi-hardwood cuttings. The experiment was conducted in a nursery with an intermittent mist system at the Propagation Center Laboratory of the Botanical Garden, Instituto Agronômico de Campinas (IAC), SP, Brazil. The experiment was arranged in a 3 x 4 factorial scheme (rootstocks x indolebutyric acid doses), with five repetitions of 20 cuttings, in a complete randomized design. Results obtained 60 days after grafting showed that: a) the propagation of ‘Taiwan Nashi-C’, ‘Taiwan Mamenashi’ and ‘Seleção IAC-1’ using semi-hardwood cuttings is technically viable; b) among the studied rootstocks, ‘Taiwan Nashi-C’ showed the highest rooting percentage, lowest callus percentage, highest root length and root number per cutting; c) rooting of semi-hardwood cuttings required application of indolebutyric acid, and the doses 4000 mg.L-1 and 6000 mg.L-1 provided the highest adventitious rooting; d) the tested doses of indolebutyric acid were not phytotoxic to semi hardwood cuttings of the studied genotypes.