Enraizamento ex vitro e aclimatização de plantas micropropagadas de abacaxizeiro ornamental

Abstract

The ananas-of-field pineapple presents a fructescence with ornamental potential. In vitro cultivation allows the obtaining of a larger number of seedlings in smaller interval of time. The objective of this work was to evaluate different concentrations of indolbutiric acid (IBA) and immersion times of plantlets of Ananas comosus var. ananassoides in the transplanting for the phase of acclimatization. In the experiment, sprouts of ornamental pineapple were used without roots, -1 -1 cultivated in MS medium, increased of 0.1 mg L of naphthalene acetic acid (NAA) e 0.5 mg L of 6-benzylaminopurine (BAP). The design was of randomized blocks in a 5x4+1factorial scheme, with five concentrations of AIB (0; 1; 10; 100 and -1 1,000 mg L ), four immersion times (5 seconds, 10 minutes, 1 hour and 12 hours) and an additional treatment (directly planted in the substrata). The rooting ex vitro of the plantlets of ananas-of-field can be accomplished without the immersion -1 in solution of AIB, eliminating the stage of rooting in vitro. The use of 1,000 mg L of AIB promoted reduction of the number of leaves, length of root and of percentages of rooting and of survival of the plants of ananas-of-field.