The objective of this work was to determine auxin type and concentration to promote in vitro rooting of quince (Cydonia oblonga Mill.) cv. MC as rootstock for pear (Pyrus spp) and to evaluate the survival of the rooted microcuttings during acclimatization in ex vitro conditions. The treatments consisted of three auxin types (IBA, NAA and IAA) and five different concentrations (0, 5, 10, 15 and 20muM). Initially the microcuttings were cultivated for seven days in culture medium constituted by salts of MS reduced to half of its original concentration and added myo-inositol (100mg L-1), sucrose (30g L-1), agar (6g L-1) and auxin. Microcuttings were then transferred to a new medium without auxin. Rooted microcuttings originating from several treatments faintly, were acclimatized in ex vitro conditions. Auxins (IBA, NAA and IAA) had the same effect on rooting percentage with the best result obtained with 10muM. NAA favored the largest mean length of the roots. Callus formation increased with auxin concentration, being larger with IBA and NAA. Survival of 65.12% of the plants was obtained after 30 days of acclimatization.
micropropagation; plant growth regulators; auxin; rootstock; Cydonia oblonga
